10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-K

(Mark One)

[X] Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended December 31, 2013

[ ] Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

Commission file number 1-11294

Unum Group

(Exact name of registrant as specified in its charter)

Delaware	62-1598430
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1 FOUNTAIN SQUARE CHATTANOOGA, TENNESSEE 37402
(Address of principal executive offices)
423.294.1011
(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common stock, $0.10 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer as defined in Rule 405 of the Securities Act. Yes [X] No [ ]

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes [ ] No [X]

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

(Check one): Large accelerated filer [X] Accelerated filer [ ] Non-accelerated filer [ ] Smaller reporting company [ ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes [ ] No [X]

The aggregate market value of the shares of the registrant's common stock held by non-affiliates (based upon the closing price of these shares on the New York Stock Exchange) as of the last business day of the registrant's most recently completed second fiscal quarter was $7.7 billion. As of February 24, 2014, there were 259,447,820 shares of the registrant's common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the information required by Part III of this Form 10-K are incorporated herein by reference from the registrant's definitive proxy statement for its 2014 Annual Meeting of Stockholders which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, within 120 days after the end of the registrant's fiscal year ended December 31, 2013.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I
Item 1.	Business	2
Item 1A.	Risk Factors	18
Item 1B.	Unresolved Staff Comments	28
Item 2.	Properties	28
Item 3.	Legal Proceedings	29
Item 4.	Mine Safety Disclosures	29
	PART II
Item 5.	Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	30
Item 6.	Selected Financial Data	31
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	32
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	89
Item 8.	Financial Statements and Supplementary Data	95
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	171
Item 9A.	Controls and Procedures	171
Item 9B.	Other Information	173
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	174
Item 11.	Executive Compensation	174
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	175
Item 13.	Certain Relationships and Related Transactions and Director Independence	176
Item 14.	Principal Accounting Fees and Services	176
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	177
	Signatures	178
	Index to Exhibits	190

Cautionary Statement Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 (the Act) provides a "safe harbor" to encourage companies to provide prospective information, as long as those statements are identified as forward-looking and are accompanied by meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those included in the forward-looking statements. Certain information contained in this Annual Report on Form 10-K (including certain statements in the business description in Item 1, Management's Discussion and Analysis in Item 7, and the consolidated financial statements and related notes in Item 8), or in any other written or oral statements made by us in communications with the financial community or contained in documents filed with the Securities and Exchange Commission (SEC), may be considered forward-looking statements within the meaning of the Act. Forward-looking statements are those not based on historical information, but rather relate to our outlook, future operations, strategies, financial results, or other developments. Forward-looking statements speak only as of the date made. We undertake no obligation to update these statements, even if made available on our website or otherwise. These statements may be made directly in this document or may be made part of this document by reference to other documents filed by us with the SEC, a practice which is known as "incorporation by reference." You can find many of these statements by looking for words such as "will," "may," "should," "could," "believes," "expects," "anticipates," "estimates," "plans," "assumes," "intends," "projects," "goals,” "objectives," or similar expressions in this document or in documents incorporated herein.

These forward-looking statements are subject to numerous assumptions, risks, and uncertainties, many of which are beyond our control. We caution readers that the following factors, in addition to other factors mentioned from time to time, may cause actual results to differ materially from those contemplated by the forward-looking statements:

• Unfavorable economic or business conditions, both domestic and foreign.

• Sustained periods of low interest rates.

• Fluctuation in insurance reserve liabilities and claim payments due to changes in claim incidence, recovery rates, mortality rates, and offsets due to, among other factors, the rate of unemployment and consumer confidence, the emergence of new diseases, epidemics, or pandemics, new trends and developments in medical treatments, the effectiveness of our claims operational processes, and changes in government programs.

• Legislative, regulatory, or tax changes, both domestic and foreign, including the effect of potential legislation and increased regulation in the current political environment.

• Investment results, including, but not limited to, changes in interest rates, defaults, changes in credit spreads, impairments, and the lack of appropriate investments in the market which can be acquired to match our liabilities.

• The failure of cyber or other information security systems, as well as the occurrence of events unanticipated in our disaster recovery systems.

• Ineffectiveness of our derivatives hedging programs due to changes in the economic environment, counterparty risk, ratings downgrades, capital market volatility, changes in interest rates, and/or regulation.

• Increased competition from other insurers and financial services companies due to industry consolidation, new entrants to our markets, or other factors.

• Changes in our financial strength and credit ratings.

• Damage to our reputation due to, among other factors, regulatory investigations, legal proceedings, external events, and/or inadequate or failed internal controls and procedures.

• Actual experience that deviates from our assumptions used in pricing, underwriting, and reserving.

• Actual persistency and/or sales growth that is higher or lower than projected.

• Changes in demand for our products due to, among other factors, changes in societal attitudes, the rate of unemployment, consumer confidence, and/or legislative and regulatory changes, including healthcare reform.

• Effectiveness of our risk management program.

• Contingencies and the level and results of litigation.

• Changes in accounting standards, practices, or policies.

• Fluctuation in foreign currency exchange rates.

• Ability to generate sufficient internal liquidity and/or obtain external financing.

• Availability of reinsurance in the market and the ability of our reinsurers to meet their obligations to us.

• Recoverability and/or realization of the carrying value of our intangible assets, long-lived assets, and deferred tax assets.

• Terrorism, both within the U.S. and abroad, ongoing military actions, and heightened security measures in response to these types of threats.

All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section.

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PART I

ITEM 1. BUSINESS

General

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively with Unum Group we refer to as the Company, operate in the United States, the United Kingdom, and, to a limited extent, in certain other countries. The principal operating subsidiaries in the United States are Unum Life Insurance Company of America (Unum America), Provident Life and Accident Insurance Company (Provident), The Paul Revere Life Insurance Company (Paul Revere Life), and Colonial Life & Accident Insurance Company, and in the United Kingdom, Unum Limited. We are the largest provider of disability insurance products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including employer- and employee-paid group benefits, life insurance, and other related services.

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Closed Block and Corporate segments. These segments are discussed more fully under "Reporting Segments" included herein in this Item 1.

Business Strategies

The benefits we provide help protect people from the financial hardship of illness, injury, or loss of life by providing support when it is needed most. As one of the leading providers of employee benefits in the U.S. and the U.K., we offer a broad portfolio of products and services through the workplace.

Specifically, we offer group, individual, and voluntary benefits, either as stand-alone products or combined with other coverages, that help employers of all sizes attract and retain a stronger workforce while protecting the incomes and livelihood of their employees. We believe employer-sponsored benefits represent the single most effective way to provide workers with access to the information and options they need to protect their financial stability. Working people and their families, particularly those at lower and middle incomes, are perhaps the most vulnerable in today's economy yet are often overlooked by many providers of financial services and products. For many of these people, employer-sponsored benefits are the primary defense against the potentially catastrophic fallout of death, illness, or injury.

We have established a corporate culture consistent with the social values our products provide. We are committed not only to meeting the needs of our customers who depend on us, but also to operating with integrity and being accountable for our actions. Our sound and consistent business practices, strong internal compliance program, and comprehensive risk management strategy enable us to operate efficiently as well as to identify and address potential areas of risk in our business. We have also applied these same values to our social responsibility efforts. Because we see important links between the obligations we have to all of our stakeholders, we place a strong emphasis on contributing to positive change in our communities.

We believe our disciplined approach to providing financial protection products at the workplace puts us in a position of strength as we seek to capitalize on the growing and largely unfilled need for our products and services. While we anticipate the environment for 2014 will be somewhat similar to modestly improving from 2013, with below-average economic growth, relatively low interest rates, and continued political uncertainty, we have strategies in place which we believe will help us navigate this environment.

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Reporting Segments

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Closed Block, and Corporate. Measured as a percentage of our 2013 consolidated premium income, our premium income was approximately 59.2 percent for Unum US, 7.3 percent for Unum UK, 16.2 percent for Colonial Life, and 17.3 percent for Closed Block. Financial information is provided in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 and Note 13 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Unum US Segment

Our Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business. The supplemental and voluntary lines of business are comprised of individual disability - recently issued insurance and voluntary benefits products. Unum US products are issued primarily by Unum America and Provident. Paul Revere Life previously issued products reported in our Unum US segment and continues to service the in-force policies, but Paul Revere Life no longer actively markets new business. Premium income for Unum US totaled $4,517.1 million in 2013. These products are marketed through our field sales personnel who work in conjunction with independent brokers and consultants. Our market strategy for Unum US is to effectively deliver an integrated offering of employee benefit products, with a focus on benefit offerings in the group core market segment, which we define for Unum US as employee groups with fewer than 2,000 lives, and the voluntary benefits market segment.

Group Long-term and Short-term Disability

Group long-term and short-term disability products contributed approximately 45.9 percent of the Unum US segment premium income in 2013. We sell group long-term and short-term disability products to employers for the benefit of employees. Group long-term disability provides employees with insurance coverage for loss of income in the event of extended work absences due to sickness or injury. We offer services to employers and insureds to encourage and facilitate rehabilitation, retraining, and re-employment. Most policies begin providing benefits following 90 or 180 day waiting periods and continue providing benefits until the employee reaches a certain age, generally between 65 and 70. The benefits are limited to specified maximums as a percentage of income.

Group short-term disability insurance generally provides coverage from loss of income due to injury or sickness, effective immediately for accidents and after one week for sickness, for up to 26 weeks, limited to specified maximums as a percentage of income.

Premiums for group long-term and short-term disability are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. In some cases, coverage for large employers will include retrospective experience rating provisions or will be underwritten on an experience-rated basis. Premiums for experience-rated group long-term and short-term disability business are based on the expected experience of the client given its demographics, industry group, and location, adjusted for the credibility of the specific claim experience of the client. Both group long-term and short-term disability are sold primarily on a basis permitting periodic repricing to address the underlying claims experience. We also offer fee-based administrative services only (ASO) products, where the responsibility for funding claim payments remains with the customer, and fee-based family medical leave products.

We have defined underwriting practices and procedures. If the coverage amount exceeds certain prescribed age and amount limits, we may require a prospective insured to submit evidence of insurability. Policies are typically issued, both at inception and renewal, with rate guarantees. For new group policyholders, the usual rate guarantee is one to three years. For group policies being renewed, the rate guarantee is generally one year, but may be longer. The profitability of the policy depends on the adequacy of the rate during the rate guarantee period. The contracts provide for certain circumstances in which the rate guarantees can be overridden.

Profitability of group long-term and short-term disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses. Morbidity is an important factor in disability claims experience, and many economic and societal factors can affect claim incidence for disability insurance. We routinely make pricing adjustments on our group insurance products, when contractually permitted, which take into account emerging experience and external factors.

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Group Life and Accidental Death and Dismemberment

Group life and accidental death and dismemberment products contributed approximately 29.6 percent of the Unum US segment premium income in 2013. Group life and accidental death and dismemberment products are sold to employers as employee benefit products. Group life consists primarily of renewable term life insurance with the coverages frequently linked to employees' wages and includes a provision for waiver of premium, if disabled. Accidental death and dismemberment consists primarily of an additional benefit amount payable if death or severe injury is attributable to an accident.

Premiums are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting practices and rate guarantees are similar to those used for group disability products, and evidence of insurability is required for benefits in excess of a specified limit.

Profitability of group life and accidental death and dismemberment insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Individual Disability - Recently Issued

Individual disability - recently issued products generated approximately 10.3 percent of the Unum US segment premium income in 2013. The policies included in this line of business were issued subsequent to the mid 1990s after substantial changes in product design were implemented to improve the overall risk profile of this type of product. Individual disability is offered primarily to multi-life employer groups to supplement their group disability plans and may be funded by the employer, but the policy is owned by the employee and is portable. Individual disability insurance provides the insured with a portion of earned income lost as a result of sickness or injury. The benefits, including the underlying group disability coverage, typically range from 30 percent to 75 percent of the insured's monthly earned income. We provide various options with respect to length of benefit periods, product features, and waiting periods before benefit payments begin, which permits tailoring of the multi-life plan to a specific employer's needs. We also market individual disability policies which include payments for the transfer of business ownership between partners and payments for business overhead expenses, also on a multi-life basis. Individual disability products do not provide for the accumulation of cash values.

Premium rates for individual disability products vary by age, product feature, and occupation based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own experience. Our underwriting rules, issue limits, and plan designs reflect the financial circumstances of prospective insureds. Individuals in multi-life groups may be subject to limited medical underwriting. The majority of our individual disability - recently issued policies are written on a noncancelable basis. Under a noncancelable policy, as long as the insured continues to pay the fixed annual premium for the policy's duration, we cannot cancel the policy or change the premium.

Profitability of individual disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Voluntary Benefits

Voluntary benefits products generated approximately 14.2 percent of the Unum US segment premium income in 2013. Voluntary benefits products are primarily sold to groups of employees through payroll deduction at the workplace and include life, disability, accident, hospital indemnity, cancer, and critical illness offered on both a group and individual basis.

Premium rates for voluntary benefits products are based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Our underwriters evaluate the medical condition of prospective policyholders prior to the issuance of a policy on a simplified basis. Underwriting requirements may be waived for cases that meet certain criteria, including participation levels. Individual voluntary benefits products other than life insurance, and generally our group products as well, are offered on a guaranteed renewable basis which allows us to re-price in-force policies, subject to regulatory approval.

Profitability of voluntary benefits products is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

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Unum UK Segment

Our Unum UK segment includes insurance for group long-term disability, group life, and supplemental lines of business which include individual disability and critical illness products. Unum UK's products are issued primarily by Unum Limited and are sold in the United Kingdom through field sales personnel and independent brokers and consultants. Premium income for Unum UK totaled $556.6 million in 2013, or £355.9 million in local currency. Our market strategy for Unum UK is to offer benefits to employers and employees through the workplace with a focus on expansion of the number of employers and employees covered in our core market segment, which we define for Unum UK as employee groups with fewer than 500 lives.

Group Long-term Disability

Group long-term disability products contributed approximately 70.1 percent of the Unum UK segment premium income in 2013. Group long-term disability products are sold to employers for the benefit of employees. Group long-term disability provides employees with insurance coverage for loss of income in the event of extended work absences due to sickness or injury. Services are offered to employers and insureds to encourage and facilitate rehabilitation, retraining, and re-employment. Most policies begin providing benefits following 90 or 180 day waiting periods and continue providing benefits until the employee reaches a certain age, generally between 60 and 67. The benefits are limited to specified maximums as a percentage of income.

Premiums for group long-term disability are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Some cases carry experience rating provisions. Premiums for experience-rated group long-term disability business are based on the expected experience of the client given its demographics, industry group, and location, adjusted for the credibility of the specific claim experience of the client.

We have defined underwriting practices and procedures.  If the coverage amount exceeds certain prescribed age and amount limits, we may require a prospective insured to submit evidence of insurability. Policies are typically issued, both at inception and renewal, with rate guarantees. The usual rate guarantee is two years but may vary depending on circumstances.  The profitability of the policy is dependent upon the adequacy of the rate during the rate guarantee period. The contracts provide for certain circumstances in which the rate guarantees can be overridden.

Profitability of group long-term disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses. Morbidity is an important factor in disability claims experience.

Group Life

Group life products contributed approximately 19.1 percent of the Unum UK segment premium income in 2013. Group life products are sold to employers as employee benefit products. Group life consists of two types of products, a renewable term life insurance product providing a lump sum benefit to the beneficiary on death of an employee and a group dependent life product, which we discontinued offering to new customers in 2012, which provides an annuity to the beneficiary upon the death of an employee. Both coverages are frequently linked to employees' wages. Premiums for group life are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting and rate guarantees are similar to those utilized for group long-term disability products.

Profitability of group life is affected by persistency, investment returns, claims experience, and the level of administrative expenses.    

Individual Disability

Individual disability products generated approximately 6.1 percent of the Unum UK segment premium income in 2013. Individual disability is offered primarily to individual retail customers. Individual disability insurance provides the insured with a portion of earned income lost as a result of sickness or injury. Under an individual disability policy, monthly benefits generally are fixed at the time the policy is written. The benefits typically range from 30 percent to 50 percent of the insured's monthly earned income. Various options with respect to length of benefit periods and waiting periods before payment begins are available and permit tailoring of the policy to a specific policyholder's needs. Individual disability products do not provide for the accumulation of cash values.

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Premium rates for individual disability products vary by age and occupation based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables. Our underwriters evaluate the medical and financial condition of prospective policyholders prior to the issuance of a policy. Approximately one half of our individual disability policies are written on a noncancelable basis. The remainder is offered on a guaranteed renewable basis which allows us to re-price in-force policies.

Profitability of individual disability insurance is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Critical Illness

Critical illness products generated approximately 4.7 percent of the Unum UK segment premium income in 2013. Group critical illness products are sold to groups of employees. Individual critical illness products are offered to individual retail customers. Critical illness products provide a lump-sum benefit on the occurrence of a covered critical illness event.

Premiums for group critical illness products are generally based on expected claims of a pool of similar risks plus provisions for administrative expenses, investment income, and profit. Underwriting and rate guarantees are similar to those utilized for group long-term disability products. Premium rates for individual critical illness products vary by age and are based on assumptions concerning morbidity, persistency, administrative expenses, investment income, and profit. Individual critical illness insurance is offered on a guaranteed renewable basis which allows us to re-price in-force policies. We develop our assumptions based on our own claims experience and published industry tables. Our underwriters evaluate the medical condition of prospective policyholders prior to the issuance of a policy.

Profitability of these products is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Colonial Life Segment

Our Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees, on both a group and an individual basis, at the workplace through an independent contractor agency sales force and brokers. Premium income for Colonial Life totaled $1,232.2 million in 2013. Our market strategy for Colonial Life is to effectively deliver a broad set of voluntary products and services with a focus on the core market segment, which we define for Colonial Life as accounts with fewer than 1,000 lives, and in the commercial and public sector markets.

We have defined underwriting practices and procedures for each of our products. Most policies are issued on a simplified issue basis, based on answers to simple health and employment questions. If the amount applied for exceeds certain levels, the applicant may be asked to answer additional health questions or submit to additional medical examinations.

Accident, Sickness, and Disability

The accident, sickness, and disability product line, which generated approximately 60.0 percent of the Colonial Life segment premium income in 2013, consists of short-term disability plans as well as accident-only plans providing benefits for injuries on a specified loss basis. It also includes accident and health plans covering hospital admissions, confinement, and surgeries on an indemnity basis.

Premiums for accident, sickness, and disability products are generally based on assumptions for morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own experience. Premiums are primarily individual guaranteed renewable for which we have the ability to change premiums on a state by state basis. A small percentage of the policies are written on a group basis for which we retain the right to change premiums at the individual account level.

Profitability is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

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The accident and health products qualify as fringe benefits that can be purchased with pre-tax employee dollars as part of a flexible benefits program pursuant to Section 125 of the Internal Revenue Code. Flexible benefits programs assist employers in managing benefit and compensation packages and provide policyholders the ability to choose benefits that best meet their needs. Laws could be changed to limit or eliminate fringe benefits available on a pre-tax basis, eliminating our ability to continue marketing our products this way. However, we believe our products provide value to our policyholders that will remain even if the tax advantages offered by flexible benefits programs are modified or eliminated.

Life

Life products contributed approximately 17.9 percent of the Colonial Life segment premium income in 2013 and are primarily comprised of universal life, whole life, and term life policies.

Premium rates vary by age and are based on assumptions concerning mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own experience and published industry tables. Premiums for the whole life and level term products are guaranteed for the life of the contract. Premiums for the universal life products are flexible and may vary at the individual policyholder level. For the group term life products, we retain the right to change premiums at the account level based on the experience of the account.

Profitability is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

Cancer and Critical Illness

Cancer and critical illness policies generated approximately 22.1 percent of the Colonial Life segment premium income in 2013. Cancer policies provide various benefits for the treatment of cancer including hospitalization, surgery, radiation, and chemotherapy. Critical illness policies provide a lump-sum benefit and/or fixed payments on the occurrence of a covered critical illness event.

Premiums are generally based on assumptions for morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own experience. Premiums are primarily individual guaranteed renewable wherein we have the ability to change premiums on a state by state basis.

Profitability of these products is affected by the level of employee participation, persistency, investment returns, claims experience, and the level of administrative expenses.

Closed Block Segment

Our Closed Block segment consists of individual disability, group and individual long-term care, and other insurance products no longer actively marketed. Premium income for Closed Block totaled $1,318.8 million in 2013.

Individual Disability

Individual disability policies generated approximately 52.1 percent of the Closed Block segment premium income in 2013. We sold these types of policies on a limited basis subsequent to the mid-1990s and entirely discontinued issuing new policies in this closed block of business in 2004, other than through update features contractually allowable on existing policies.

The majority of the policies represent individual disability insurance which was written on a noncancelable basis and was marketed on a single-life customer basis.

Profitability is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

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Group and Individual Long-term Care

Long-term care policies generated approximately 47.8 percent of the Closed Block segment premium income in 2013. We discontinued offering individual long-term care in 2009 and group long-term care in 2012, other than features contractually allowable on existing group policies. Group long-term care was previously offered to employers for the benefit of employees. Individual long-term care was previously marketed on a single-life customer basis.

Long-term care insurance pays a benefit upon the loss of two or more activities of daily living and the insured's requirement of standby assistance or cognitive impairment. Payment is generally made on an indemnity basis, regardless of expenses incurred, up to a lifetime maximum. Benefits begin after a waiting period, usually 90 days or less, and are generally paid for a period of three years, six years, or lifetime.

Our long-term care insurance was sold on a guaranteed renewable basis which allows us to re-price in-force policies, subject to regulatory approval. Premium rates for long-term care vary by age and are based on assumptions concerning morbidity, mortality, persistency, administrative expenses, investment income, and profit. We develop our assumptions based on our own claims and persistency experience and published industry tables.

Profitability is affected by persistency, investment returns, claims experience, and the level of administrative expenses.

Other

Other insurance products not actively marketed include group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous product lines. The majority of these products have been reinsured, with approximately 80 percent of reserves at December 31, 2013 ceded to other insurance companies. These products contributed approximately 0.1 percent of the Closed Block segment premium income in 2013.

Corporate Segment

Our Corporate segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt other than non-recourse debt, and certain other corporate income and expense not allocated to a line of business.

Reinsurance

In the normal course of business, we assume reinsurance from and cede reinsurance to other insurance companies. In a reinsurance transaction, a reinsurer agrees to indemnify another insurer for part or all of its liability under a policy or policies it has issued for an agreed upon premium. We undertake reinsurance transactions for both risk management and capital management. If the assuming reinsurer in a reinsurance agreement is unable to meet its obligations, we remain contingently liable. In the event that reinsurers do not meet their obligations under the terms of the reinsurance agreement, reinsurance recoverable balances could become uncollectible. We evaluate the financial condition of reinsurers to whom we cede business and monitor concentration of credit risk to minimize our exposure. We may also require assets to be held in trust, letters of credit, or other acceptable collateral to support reinsurance recoverable balances. The collectibility of our reinsurance recoverable is primarily a function of the solvency of the individual reinsurers. Although we have controls to minimize our exposure, the insolvency of a reinsurer or the inability or unwillingness of a reinsurer to comply with the terms of a reinsurance contract could have a material adverse effect on our results of operations.

In general, the maximum amount of life insurance risk retained by our U.S. insurance subsidiaries and not ceded is $750,000 per covered life per policy under a group or individual life policy and under a group or individual accidental death and dismemberment policy. For Unum Limited life insurance risk, during 2013 we had reinsurance agreements which provided 50 percent coverage up to £500,000 per covered life and 100 percent coverage per covered life above that amount for the existing in-force block of group life business as well as any new policies issued during the term of the agreements.  During 2014, we intend to continue with Unum Limited's reinsurance program, although we have increased our retention level for group life products that provide lump sum benefits.

We have reinsurance agreements on approximately 77 percent of our Closed Block individual disability business. As of December 31, 2013, this reinsurance covers approximately 67 percent of that portion of the consolidated risk above a $6.6 billion retention limit.  The risk limit for the reinsurer grows over time to a maximum of $2.2 billion, after which any further losses will revert to us.

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We have global catastrophic reinsurance coverage which includes five layers of coverage to limit our exposure under life, accidental death and dismemberment, long-term care, and disability policies in regards to a catastrophic event. We have 50 percent reinsurance coverage in the first layer, 80 percent coverage in the second, third, and fourth layers, and 60 percent coverage in the fifth layer, for a total of $475 million of catastrophic coverage, after a $50 million deductible. Layer one provides $25 million of coverage, layers two through four provide $40 million, $80 million, and $120 million of coverage, respectively, and layer five provides $210 million of coverage. Each layer provides coverage for all catastrophic events, including acts of war and any type of terrorism. In addition to the global catastrophic reinsurance coverage noted above, Unum Limited has additional catastrophic coverage via an arms-length, inter-company reinsurance agreement with Unum America, under similar terms as the global catastrophic treaties. The coverage is placed at 40 percent reinsurance for a total of £75 million of catastrophic coverage, after a £225 million deductible. Events may occur which limit or eliminate the availability of catastrophic reinsurance coverage in future years.

We have a quota share reinsurance agreement under which we cede certain blocks of Unum US group long-term disability claims. The agreement is on a combination coinsurance with funds withheld and modified coinsurance basis and provides 80 percent quota share reinsurance on the ceded claims. We also have three reinsurance agreements that collectively cede approximately 50 percent of Unum US group life risk up to our per person retention limit for our U.S. insurance subsidiaries. These reinsurance agreements for Unum US group disability and group life allow us to more effectively manage capital in conformity with statutory accounting principles but do not meet insurance risk transfer in accordance with applicable U.S generally accepted accounting principles (GAAP) and therefore are not accounted for as reinsurance in our consolidated GAAP financial statements.

Certain of our domestic insurance subsidiaries cede blocks of business to Northwind Reinsurance Company (Northwind Re), Tailwind Reinsurance Company (Tailwind Re), and UnumProvident International Ltd. (UPIL), all of which are affiliated captive reinsurance subsidiaries (captive reinsurers) with Unum Group as the ultimate parent. These captive reinsurers were established for the limited purpose of reinsuring risks attributable to specified policies issued or reinsured by our insurance subsidiaries in order to effectively manage risks in connection with certain blocks of our business as well as to enhance our capital efficiency. The captive reinsurers are domiciled in the United States. UPIL, which was previously domiciled in Bermuda, was re-domesticated to the United States during 2013. On a consolidated reporting basis for Unum Group, financial statement impacts of these intercompany reinsurance arrangements are eliminated in accordance with GAAP.

For further discussion of our reinsurance activities, refer to "Risk Factors" contained herein in Item 1A, "Liquidity and Capital Resources - Captive Reinsurance Subsidiaries" contained herein in Item 7, and Notes 1, 12, and 15 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Reserves for Policy and Contract Benefits

The applicable insurance laws under which insurance companies operate require that they report, as liabilities, policy reserves to meet future obligations on their outstanding policies. These reserves are the amounts which, with the additional premiums to be received and interest thereon compounded annually at certain assumed rates, are calculated to be sufficient to meet the various policy and contract obligations as they mature. These laws specify that the reserves shall not be less than reserves calculated using certain specified mortality and morbidity tables, interest rates, and methods of valuation required for statutory accounting.

The reserves reported in our financial statements contained herein are calculated in conformity with GAAP and differ from those specified by the laws of the various states and reported in the statutory financial statements of our life insurance subsidiaries. These differences result from the use of mortality and morbidity tables and interest assumptions which we believe are more representative of the expected experience for these policies than those required for statutory accounting purposes and also result from differences in actuarial reserving methods.

The assumptions we use to calculate our reserves are intended to represent an estimate of experience for the period that policy benefits are payable. If actual experience is not less favorable than our reserve assumptions, then reserves should be adequate to provide for future benefits and expenses. If experience is less favorable than the reserve assumptions, additional reserves may be required. The key experience assumptions include disability claim incidence rates, disability claim recovery rates, mortality rates, policy persistency, interest rates, and policy benefit offsets, including those for social security and other government-based welfare benefits. We periodically review our experience and update our policy reserves for new issues and reserves for all claims incurred, as we believe appropriate.

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The consolidated statements of income include the annual change in reserves for future policy and contract benefits. The change reflects a normal accretion for premium payments and interest buildup and decreases for policy terminations such as lapses, deaths, and benefit payments. If policy reserves using best estimate assumptions as of the date of a test for loss recognition are higher than existing policy reserves net of any deferred acquisition costs, the increase in reserves necessary to recognize the deficiency is also included in the change in reserves for future policy and contract benefits.

For further discussion of reserves, refer to "Risk Factors" contained herein in Item 1A, "Critical Accounting Estimates" and the discussion of segment operating results included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7, and Notes 1 and 6 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Investments

Investment activities are an integral part of our business, and profitability is significantly affected by investment results. We segment our invested assets into portfolios that support our various product lines. Generally, our investment strategy for our portfolios is to match the effective asset cash flows and durations with related expected liability cash flows and durations to consistently meet the liability funding requirements of our businesses. We seek to earn investment income while assuming credit risk in a prudent and selective manner, subject to constraints of quality, liquidity, diversification, and regulatory considerations. Our overall investment philosophy is to invest in a portfolio of high quality assets that provide investment returns consistent with that assumed in the pricing of our insurance products. Assets are invested predominately in fixed maturity securities. Changes in interest rates may affect the amount and timing of cash flows.

We actively manage our asset and liability cash flow match and our asset and liability duration match to limit interest rate risk. We may redistribute investments among our different lines of business, when necessary, to adjust the cash flow and/or duration of the asset portfolios to better match the cash flow and duration of the liability portfolios. Asset and liability portfolio modeling is updated on a quarterly basis and is used as part of the overall interest rate risk management strategy. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and also at levels reflecting an increase and a decrease in interest rates to obtain a range of projected cash flows under the different interest rate scenarios. These results enable us to assess the impact of projected changes in cash flows and duration resulting from potential changes in interest rates. Testing the asset and liability portfolios under various interest rate scenarios enables us to choose what we believe to be the most appropriate investment strategy, as well as to limit the risk of disadvantageous outcomes. We use this analysis in determining hedging strategies and utilizing derivative financial instruments for managing interest rate risk and the risk related to matching duration for our assets and liabilities. We do not use derivative financial instruments for speculative purposes.

Refer to "Risk Factors" contained herein in Item 1A, "Critical Accounting Estimates" and the discussion of investments in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7, and Notes 1, 2, 3, and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for information on our investments and derivative financial instruments.

Ratings

AM Best, Fitch Ratings (Fitch), Moody's Investors Service (Moody's), and Standard & Poor's Ratings Services (S&P) are among the third parties that assign issuer credit ratings to Unum Group and financial strength ratings to our insurance subsidiaries. Issuer credit ratings reflect an agency's opinion of the overall financial capacity of a company to meet its senior debt obligations. Financial strength ratings are specific to each individual insurance subsidiary and reflect each rating agency's view of the overall financial strength (capital levels, earnings, growth, investments, business mix, operating performance, and market position) of the insuring entity and its ability to meet its obligations to policyholders. Both the issuer credit ratings and financial strength ratings incorporate quantitative and qualitative analyses by rating agencies and are routinely reviewed and updated on an ongoing basis.

Rating agencies assign an outlook statement of "positive," "negative," or "developing" to indicate an intermediate-term trend in credit fundamentals which could lead to a rating change. "Positive" means that a rating may be raised, "negative" means that a rating may be lowered, and "developing" means that a rating may be raised or lowered with equal probability. Alternatively, a rating may have a "stable" outlook to indicate that the rating is not expected to change.

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"Credit watch" or "under review" highlights the potential direction of a short-term or long-term rating. It focuses on identifiable events and short-term trends that cause a rating to be placed under heightened surveillance by a rating agency. Events that may trigger this action include mergers, acquisitions, recapitalizations, regulatory actions, criteria changes, or operating developments. Ratings may be placed on credit watch or under review when an event or a change in an expected trend occurs and additional information is needed to evaluate the current rating level. This status does not mean that a rating change is inevitable, and ratings may change without first being placed on a watch list.

Our financial strength ratings as of February 2014 for our principal U.S. domiciled insurance company subsidiaries were:

• A (Excellent) by AM Best - 3rd of 16 rankings

• A (Strong) by Fitch - 6th of 19 rankings

• A2 (Good) by Moody's - 6th of 21 rankings

• A (Strong) by S&P - 6th of 21 rankings 

Our issuer credit ratings for Unum Group as of February 2014 were:

• bbb (Good) by AM Best - 9th of 22 rankings

• BBB (Good) by Fitch - 9th of 21 rankings

• Baa2 (Adequate) by Moody's - 9th of 21 rankings

• BBB (Adequate) by S&P - 9th of 22 rankings

As of February 2014, all four rating agencies have a "stable" outlook for our Company, and none of the ratings are currently under review or on credit watch. See further discussion in "Risk Factors" contained herein in Item 1A and in "Management's Discussion and Analysis of Financial Condition and Results of Operations - Ratings" contained herein in Item 7. A rating is not a recommendation to buy, sell, or hold securities and may be subject to revision or withdrawal at any time by the rating agency. Each rating should be evaluated independently of any other rating.

Competition

There is significant competition among insurance companies for the types of products we sell. We believe that the principal competitive factors affecting our business are price, quality of customer service and claims management, integrated product choices, and financial strength. In the individual and group disability markets, we compete in the United States with a limited number of major companies and regionally with other companies offering specialty products. Our principal competitors for our other products, including group life and the product offerings sold to groups of employees through payroll deduction, include the largest insurance companies in the United States. Some of these companies have more competitive pricing or have higher claims-paying ratings. Some may also have greater financial resources with which to compete.

In the United Kingdom, we compete for the individual and group products we sell with a number of large internationally recognized providers and strong local carriers.  These providers have been aggressively trying to maintain market share in a difficult economic environment, characterized by very low interest rates and expense pressures on employers and individuals.

We believe the need for the types of products we offer is significant. In both the United States and the United Kingdom, individuals and families often live paycheck to paycheck with a considerable chance of being out of work.  Pressure is also mounting on governments as to the sustainability of public assistance.  Based on current penetration levels, we believe there is substantial upside growth potential.

All areas of the employee benefits markets are highly competitive due to the yearly renewable term nature of the group products and the large number of insurance companies offering products in this market. There is a risk that purchasers of employee benefits products may be able to obtain more favorable terms from competitors in lieu of renewing coverage with us. The effect of competition may, as a result, adversely affect the persistency of these and other products, as well as our ability to sell products in the future.

We must attract and retain independent agents and brokers to actively market our products. Strong competition exists among insurers for agents and brokers. We compete with other insurers for sales agents and brokers primarily on the basis of our product offerings, financial strength, support services, and compensation. Sales of our products could be materially adversely affected if we are unsuccessful in attracting and retaining agents and brokers.

For further discussion, refer to "Risk Factors" contained herein in Item 1A.

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Regulation

We and our subsidiaries are subject to extensive and comprehensive supervision and regulation both in the United States and in the United Kingdom. The laws and regulations with which we must comply are complex and subject to change. New or existing laws and regulations may become more restrictive or otherwise adversely affect our operations. As a result of the financial market and economic challenges over the past few years, regulation and the cost of compliance with regulation has continued to increase.

Insurance Regulation and Oversight

Our U.S. insurance subsidiaries are subject to regulation and oversight by insurance regulatory authorities in the jurisdictions in which they do business and by the U.S. Department of Labor (DOL) on a national basis, primarily for the protection of policyholders. State insurance departments in the U.S. generally have broad powers with respect to all aspects of the insurance business, including the power to: license and examine insurance companies; regulate and supervise sales practices and market conduct; license agents and brokers; approve policy forms; approve premium rates for certain insurance products; establish reserve requirements and solvency standards; place limitations on shareholder dividends; prescribe the form and content of required financial statements and reports; regulate the types and amounts of permitted investments; and regulate reinsurance transactions. Our U.S. insurance subsidiaries are examined periodically by their states of domicile and by other states in which they are licensed to conduct business. The domestic examinations have traditionally emphasized financial matters from the perspective of protection of policyholders, but they can and have covered other subjects that an examining state may be interested in reviewing, such as market conduct issues. Examinations in other states more typically focus on market conduct, such as a review of a sales practices, including the content and use of advertising materials and the licensing and appointing of agents and brokers, as well as underwriting, claims, and customer service practices, and identification and handling of unclaimed property to determine compliance with state laws. Our U.S. insurance subsidiaries are also subject to assessments by state insurance guaranty associations to cover the proportional cost of insolvent or failed insurers. The DOL enforces a comprehensive federal statute which regulates claims paying fiduciary responsibilities and reporting and disclosure requirements for most employee benefit plans.

Our U.K. insurance subsidiary, Unum Limited, is subject to dual regulation by the Prudential Regulation Authority (PRA) and the Financial Conduct Authority (FCA), both of which replaced the Financial Services Authority (FSA) effective April 1, 2013. The PRA oversees the financial health and stability of financial services firms and is responsible for the prudential regulation and day-to-day supervision of insurance companies. The FCA seeks to protect consumers and takes over the authority in that area previously exercised by the FSA in overseeing financial services products and practices, including those governing insurance companies in the U.K.

Capital Requirements

Risk‑based capital (RBC) standards for U.S. life insurance companies have been prescribed by the National Association of Insurance Commissioners (NAIC). The domiciliary states of our U.S. insurance subsidiaries have all adopted a version of the RBC model formula of the NAIC, which prescribes a system for assessing the adequacy of statutory capital and surplus for all life and health insurers. The basis of the system is a risk-based formula that applies prescribed factors to the various risk elements in a life and health insurer's business to report a minimum capital requirement proportional to the amount of risk assumed by the insurer. The life and health RBC formula is designed to measure annually (i) the risk of loss from asset defaults and asset value fluctuations, (ii) the risk of loss from adverse mortality and morbidity experience, (iii) the risk of loss from mismatching of asset and liability cash flow due to changing interest rates, and (iv) business risks. The formula is used as an early warning tool to identify companies that are potentially inadequately capitalized. The formula is intended to be used as a regulatory tool only and is not intended as a means to rank insurers generally.

The NAIC's Solvency Modernization Initiative (SMI) began in June 2008. The SMI is a self-examination of the United States' insurance solvency regulation framework and includes a review of international developments regarding insurance supervision, banking supervision, and international accounting standards and their potential use in U.S. insurance regulation. The SMI is a wide-ranging initiative that, by its nature, will evolve to respond to national and international insurance regulatory and solvency developments. Current SMI goals and the principles developed through the SMI's exploration of capital requirements, governance and risk management, group supervision, statutory accounting and financial reporting, and reinsurance will likely result in significant changes to U.S. insurance regulation and solvency standards, including those for our U.S. insurance subsidiaries. Progress on the various initiatives is expected to continue throughout 2014.

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During 2012, the NAIC established a subgroup to study the insurance industry's use of captive reinsurers and special purpose vehicles to transfer insurance risk and is considering ways to promote uniformity in both the approval and supervision of such reinsurers. We are currently unable to predict the ultimate outcome of the NAIC's study. Although we believe it to be unlikely, a potential outcome of the NAIC study is that companies could be prohibited from using captive reinsurers. The expected effect of such prohibition would depend on the specific changes to state regulations that might be adopted as a result of the NAIC study, including whether current captive reinsurers would be allowed to continue in existence or, if not, the method and timing of their dissolution, as well as the cost and availability of alternative reinsurance vehicles. At this time, given the uncertainty around the ultimate outcome of these matters, we are unable to estimate the potential impact on our risk-based capital ratios and/or liquidity should the use of captive reinsurers be limited or prohibited. No changes in the use or regulation of captive reinsurers have been proposed by the NAIC, and it is too early to predict the extent of any changes that might be made. Accordingly, we expect to continue our strategy of using captive reinsurers to manage risks and enhance capital efficiency while monitoring the NAIC's study and proposed changes in regulations. See "Reinsurance" contained herein in this Item 1 for further discussion.

The PRA has statutory requirements, including capital adequacy and liquidity requirements and minimum solvency margins, to which Unum Limited must adhere.  Current solvency standards require an insurance company to hold capital equal to the greater of (i) a formulaic calculation of capital related to liabilities or (ii) a risk-based assessment of capital which is company specific reflecting the insurance company's individual risk profile.  Solvency II, a European Union directive that will prescribe new capital requirements and risk management standards that are the result of a fundamental review of the capital adequacy standards for the European insurance industry, will replace the current capital requirements for Unum Limited.  Our European holding company will also be subject to the Solvency II requirements relevant to insurance holding companies, and its subsidiaries, including Unum Limited, will be subject to group supervision under Solvency II. Solvency II requirements have not been fully finalized, but the current proposals contain amended requirements on capital adequacy and risk management for insurers, including (i) requirements to demonstrate adequate financial resources, including quantitative requirements, technical provisions, and calculation of Solvency II capital requirements through either an approved full or partial internal model or the European standard formula approach, (ii) requirements to demonstrate an adequate system of governance, including effective risk management underpinned by prospective risk identification and quantification, and (iii) disclosure and regulatory reporting requirements.  The effective adoption date is expected to be January 1, 2016.  The impact of Solvency II on our U.K. subsidiaries cannot be determined at this time, but its implementation could result in increased capital, supervisory, and disclosure requirements.

See further discussion in "Risk Factors" contained herein in Item 1A and "Liquidity and Capital Resources" contained herein in Item 7 and Note 15 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.     

Insurance Holding Company Regulation

We and our U.S. insurance subsidiaries (excluding captive insurers) are subject to regulation under the insurance holding company laws in the states in which they are domiciled (or deemed to be commercially domiciled), which currently include Maine, Massachusetts, Tennessee, South Carolina, New York, and California. These laws generally require each insurance company that is domiciled in the state and a member of an insurance holding company system to register with the insurance department of that state and to furnish at least annually financial and other information about the operations of companies within the holding company system, including information concerning capital structure, ownership, management, financial condition, and certain intercompany transactions. Transactions between an insurer and affiliates in the holding company system generally must be fair and reasonable and, if material, require prior notice and approval by the domiciliary insurance regulator.

In addition, such laws and regulations restrict the amount of dividends that may be paid by our insurance subsidiaries to their respective shareholders, including our Company and certain of our intermediate holding company subsidiaries. See further discussion in "Risk Factors" contained herein in Item 1A and "Liquidity and Capital Resources - Cash Available from Subsidiaries" contained herein in Item 7.

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There are a number of proposals to amend state insurance laws and regulations in ways that could affect us and our insurance subsidiaries. The NAIC has adopted or amended model laws on holding company regulation that provide for supervision of insurers at the corporate group level. Although these changes are only beginning to be adopted by individual state regulators, it can be expected that most will ultimately adopt them in some form. The various proposals to implement group supervision include uniform standards for insurer corporate governance, group-wide supervision of insurance holding companies, adjustments to RBC calculations to account for group-wide risks, and additional regulatory and disclosure requirements for insurance holding companies. A completed activity within the SMI includes the recent adoption by the NAIC of the Risk Management and Own Risk and Solvency Assessment Model Act and the Own Risk and Solvency Assessment (ORSA) Guidance Manual which require insurers to provide a group-level perspective on the risks of the current and future business plans and the sufficiency of capital to support those risks. We expect to file our ORSA summary report with the applicable insurance regulators in 2015.

The laws of most states, including the states in which our insurance subsidiaries are domiciled (or deemed to be commercially domiciled), require regulatory approval of a change in control of an insurance company or its holding company. Where these laws apply to us, there can be no effective change in control of our Company or of any of our insurance subsidiaries unless the person seeking to acquire control has filed a statement containing specified information with the appropriate insurance regulators and has obtained their prior approval of the proposed change. The usual measure for a presumptive change of control pursuant to these laws is the acquisition of 10 percent or more of the voting stock of an insurance company or its holding company, although this presumption is rebuttable. Consequently, a person acquiring 10 percent or more of the voting stock of an insurance company or its holding company without the prior approval of the insurance regulators in the state(s) of domicile of the insurance company(ies) sought to be acquired (or whose holding company is sought to be acquired) will be in violation of these laws. Such a person may also be subject to one or more of the following actions: (i) injunctive action requiring the disposition or seizure of those securities by the applicable insurance regulators; (ii) prohibition of voting of such shares; and (iii) other actions determined by the relevant insurance regulators. Further, many states' insurance laws require that prior notification be given to state insurance regulators of a change in control of a non-domiciled insurance company doing business in the state. These pre-notification statutes do not authorize the state insurance regulators to disapprove the change in control; however, they do authorize regulatory action in the affected state if particular conditions exist, such as undue market concentration. Any future transactions that would constitute a change in control of our Company or of any of our insurance subsidiaries may require prior notification in those states that have adopted pre-notification laws.

These laws may discourage potential acquisition proposals and may delay, deter, or prevent a change in control of our Company, including through transactions, and in particular unsolicited transactions, that some or all of our shareholders might consider to be desirable.

Federal Laws and Regulations

Enacted in 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (Dodd-Frank) effects comprehensive changes to the regulation of financial services in the United States. Dodd-Frank directs various government agencies and bodies to promulgate regulations implementing the law, an ongoing process anticipated to continue over the next few years. Among other provisions, Dodd-Frank creates a new framework for regulation of the over-the-counter derivatives markets, including requiring that certain swaps be executed through a centralized exchange or regulated facility and be cleared through a regulated clearinghouse and subjecting major swap participants to capital and margin (i.e., collateral) requirements, which will likely have the effect of increasing the costs of hedging generally and the credit risk posed by some counterparties. We use derivative transactions to help us manage certain risks in our business. New margin requirements for cleared and uncleared transactions are expected to require the posting of higher margin levels for our derivatives activities and also may narrowly restrict the range of eligible collateral, which may require us to hold more of our assets in cash or cash equivalents that generate lower yields than other investments.

Dodd-Frank also established a Financial Stability Oversight Council (FSOC) with authority to subject systemically important financial companies (including non-bank financial companies such as us) to supervision and stricter prudential regulation by the Board of Governors of the Federal Reserve Board, including stricter requirements and limitations relating to risk-based capital, leverage, liquidity, stress testing, and credit exposure, and in certain circumstances limitations on acquisitions or combinations, restrictions on product offerings, and/or requirements to sell assets. In April 2012, the FSOC adopted final rules for evaluating whether a non-bank financial company should be designated as systemically important. We have not been designated as a systemically important financial company, and based on the quantitative criteria set forth in the final rules, at this time we believe it is unlikely that we will be subject to such designation.

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In addition, Dodd-Frank established a Federal Insurance Office (FIO) within the Department of the Treasury to monitor all aspects of the insurance industry (other than with respect to health insurance, certain long-term care insurance, and crop insurance), including identifying issues or gaps in the regulation of insurers that could contribute to a systemic crisis in the insurance industry or the U.S. financial system and recommending insurers (potentially including us) that should be designated for stricter regulation. In December 2013, the FIO released its report on how to modernize and improve the system of insurance regulation in the United States. The report concludes that modernization and improvement are possible through a combination of steps by states and certain actions by the federal government. The report makes recommendations for enhanced uniformity and efficiency by states in the areas of insolvency and marketplace regulation and for direct federal involvement in certain areas, such as for the FIO to engage in supervisory colleges and also to study and report on the manner in which personal information is used for insurance pricing and coverage purposes.

We are subject to the laws and regulations generally applicable to public companies, including the rules and regulations of the Securities and Exchange Commission and the New York Stock Exchange relating to public reporting and disclosure, accounting and financial reporting, corporate governance, and securities trading. Further, the Sarbanes-Oxley Act of 2002, and rules and regulations adopted under this regulation, have increased the requirements for us and other public companies in these and other areas.

The USA PATRIOT Act of 2001 (Patriot Act) contains anti-money laundering and financial transparency laws and mandates the implementation of various new regulations applicable to broker-dealers and other financial services companies, including insurance companies. The Patriot Act seeks to promote cooperation among financial institutions, regulators and law enforcement entities in identifying parties that may be involved in terrorism or money laundering. Anti-money laundering laws outside of the United States contain some similar provisions. Additionally, other federal laws and regulations, including the Foreign Corrupt Practices Act and regulations issued by the Office of Foreign Asset's Controls, as well as the U.K.'s Bribery Act of 2010, have increased requirements relating to identifying customers, prohibiting transactions with certain organizations or individuals, watching for and reporting suspicious transactions, responding to requests for information by regulatory authorities and law enforcement agencies, sharing information with other financial institutions, and requiring the implementation and maintenance of internal practices, procedures, and controls.

For further discussion of regulation, refer to "Risk Factors" contained herein in Item 1A.

Geographic Areas

Operating revenue, which excludes net realized investment gains and losses, for our Unum UK segment totaled $705.2 million, $865.5 million, and $877.8 million for 2013, 2012, and 2011, respectively. These amounts were approximately 6.8 percent, 8.3 percent, and 8.5 percent of consolidated operating revenue for 2013, 2012, and 2011, respectively. As of December 31, 2013, total assets and liabilities for our Unum UK segment were $3.7 billion and $3.0 billion, respectively, or approximately 6.2 percent and 5.9 percent of consolidated assets and liabilities, respectively. Fluctuations in the U.S. dollar relative to the local currency of our Unum UK segment will impact our reported operating results. See "Risk Factors" contained herein in Item 1A and "Quantitative and Qualitative Disclosures About Market Risk" contained herein in Item 7A for further discussion of fluctuations in foreign currency exchange rates. See "Reporting Segments" contained herein in Item 1; "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7; and Note 13 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of Unum UK's operating results.

Employees

At December 31, 2013, we had approximately 9,200 full-time employees.

Available Information

Our internet website address is www.unum.com. We make available, free of charge, on or through our website our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after filing such material with the Securities and Exchange Commission.

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Executive Officers of the Registrant

Our executive officers, all of whom are also executive officers of certain of our principal subsidiaries, were appointed by Unum Group's board of directors to serve until their successors are chosen and qualified or until their earlier resignation or removal.

Name	Age	Position
Thomas R. Watjen	59	President and Chief Executive Officer and a Director
Liston Bishop III	67	Executive Vice President and General Counsel
Breege A. Farrell	54	Executive Vice President and Chief Investment Officer
Randall C. Horn	61	Executive Vice President, President and Chief Executive Officer, Colonial Life
Christopher J. Jerome	53	Executive Vice President, Global Services
Kevin P. McCarthy	58	Executive Vice President and Chief Operating Officer
John F. McGarry	56	Executive Vice President, President and Chief Executive Officer, Closed Block Operations
Richard P. McKenney	45	Executive Vice President and Chief Financial Officer
Peter G. O'Donnell	47	Executive Vice President, President and Chief Executive Officer, Unum UK
Michael Q. Simonds	40	Executive Vice President, President and Chief Executive Officer, Unum US

Mr. Watjen became President and Chief Executive Officer in March 2003. He served as Vice Chairman and Chief Operating Officer from May 2002 until March 2003. He became Executive Vice President, Finance in June 1999 and assumed the additional Risk Management responsibilities in November 1999. Mr. Watjen originally joined a Unum Group predecessor company as Executive Vice President and Chief Financial Officer in 1994.

Mr. Bishop was named Executive Vice President and General Counsel in October 2008. From August 1979 through September 2008, Mr. Bishop practiced corporate and securities law as a member of the law firm of Miller & Martin PLLC, except during the period from January 2005 through July 2007 when he was employed as deputy general counsel and corporate secretary of Coca-Cola Enterprises Inc. 

Ms. Farrell was named Executive Vice President and Chief Investment Officer in August 2013, after having joined the Company as Senior Vice President and Chief Investment Officer in April 2011. Before joining the Company, she held a number of executive-level investment positions within the organization of The Allstate Corporation, a personal lines insurer, including as Senior Managing Director of Allstate Investments, LLC and certain affiliated companies from January 2010 to April 2011, and as Managing Director of these companies from August 2004 to January 2010.

Mr. Horn was named Executive Vice President, President and Chief Executive Officer, Colonial Life in May 2006. Prior to that, he served as President and Chief Executive Officer, Colonial Life from March 2004.  Before joining the Company, he served as Executive Vice President of Mutual of Omaha Insurance Company from 1993 until 2003, having joined that company in 1981.

Mr. Jerome was named Executive Vice President, Global Services in July 2013, after having served as Senior Vice President, Global Services from January 2012. He previously served as Senior Vice President, Risk Operations from July 2010, as Senior Vice President, Underwriting & Service Operations, Unum US from May 2010, and as Senior Vice President, Group Underwriting Operations from August 2006. Mr. Jerome originally joined a Unum Group predecessor company in 1983.

Mr. McCarthy was named Executive Vice President and Chief Operating Officer in January 2012. He served as President and Chief Executive Officer of Unum US from May 2007 through June 2013. He previously served as Executive Vice President, President, Unum US from January 2007. Prior to that, he served as Executive Vice President, Risk Operations from January 2006. He previously served as Executive Vice President, Underwriting from May 2003. Mr. McCarthy originally joined a Unum Group predecessor company in 1976.

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Mr. McGarry was named Executive Vice President, President and Chief Executive Officer, Closed Block Operations in August 2013, after having served as Executive Vice President, Individual Disability and Long-term Care Closed Block Operations from September 2012. He previously served as Executive Vice President, President and Chief Executive Officer, Unum UK from July 2010, and as Senior Vice President, Benefits, Individual Disability, and National Client Group Business, Unum US from January 2010. Prior to that, he served in various other capacities within Unum US, including as Senior Vice President, Benefits Operations and Risk Management from March 2008 to January 2010, and as Senior Vice President, Benefits Operations from January 2006 to March 2008. Mr. McGarry originally joined a Unum Group predecessor company in 1986.

Mr. McKenney was named Executive Vice President and Chief Financial Officer in August 2009, having joined the Company in July 2009. Before joining the Company, Mr. McKenney served as Executive Vice President and Chief Financial Officer of Sun Life Financial Inc., an international financial services company, from February 2007, having joined that company as Executive Vice President in September 2006. He served as Senior Vice President and Chief Financial Officer of Genworth Financial, Inc., a global financial security company, from May 2004 until August 2006.

Mr. O'Donnell was named President and Chief Executive Officer, Unum UK, in September 2012, after having joined the Company as Unum Limited's Chief Financial Officer in 2010. Prior to joining Unum Limited, Mr. O'Donnell served as Director of Group Finance at Prudential plc, an international financial services company, from May 2008 to May 2010. He served as Finance director at Royal & SunAlliance plc, an international financial services company, from May 2005 to May 2008.

Mr. Simonds was named Executive Vice President, President and Chief Executive Officer, Unum US in July 2013, after having served as Senior Vice President and Chief Operating Officer, Unum US from June 2012. He previously served as Senior Vice President, Growth Operations, Unum US from July 2010, and as Senior Vice President and Chief Marketing Officer, Unum US from March 2008. Mr. Simonds originally joined a Unum Group predecessor company in 1994, left the Company in 2000 to further his education and to serve as a consultant with McKinsey & Company, a global management consulting firm, and rejoined the Company in 2003.

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ITEM 1A. RISK FACTORS

We face a wide range of risks, and our continued success depends on our ability to identify and appropriately manage our risk exposures. Discussed below are certain factors that may adversely affect our business, results of operations, or financial condition. Any one or more of the following factors may cause our actual results for various financial reporting periods to differ materially from those expressed in any forward looking statements made by or on behalf of the Company, including those in this document or made by us elsewhere, such as in earnings release investor calls, investor conference presentations, or press releases. See "Cautionary Statement Regarding Forward-Looking Statements" contained herein on page 1.

Unfavorable economic conditions may result in lower sales, lower premium growth and persistency, higher claims incidence, and longer claims duration, which may adversely affect our results of operations or financial condition.

We are affected by conditions in the capital markets and the general economy, both in the United States, the United Kingdom, and to a lesser extent, the broader global financial markets. A challenging business environment and volatile markets persisted through 2013 and may continue in 2014. Adversity in the capital markets and the general economy may adversely affect our business and results of operations.

In particular, factors such as unemployment levels, consumer confidence levels, consumer spending, business investment, government spending, the volatility and strength of the capital markets, and inflation all affect the business and economic environment and, ultimately, the amount and profitability of our businesses. Given the nature of our products, in an economic environment characterized by higher unemployment, lower personal income, reduced consumer spending, and lower corporate earnings and investment, new product sales may be adversely affected. Our premium growth may also be negatively impacted by lower premium growth from existing customers due to lower salary growth and lower growth in the number of employees covered under an existing policy. In addition, during such periods we may experience higher claims incidence, longer claims duration, and/or an increase in policy lapses, any of which could have a material adverse effect on our results of operations or financial condition.

Sustained periods of low interest rates in the long-term investment market may adversely affect our reported net investment income and the discount rates used in reserving for our insurance products and projecting our pension obligations, which may adversely affect our results of operations or financial condition.

Continued low interest rates and yields on fixed income investments may cause the rates of return on our investment portfolio to decrease more than expected, leading to lower net investment income than assumed in the pricing and reserving for our insurance products. An interest, or discount, rate is used in calculating reserves for our insurance products. We set our reserve discount rate assumptions based on our current and expected future investment yield for assets supporting the reserves, considering current and expected future market conditions. If the discount rate assumed in our reserve calculations is higher than our future investment returns, our invested assets will not earn enough investment income to support our future claim payments. In that case, the reserves may eventually be insufficient, resulting in the need to increase our reserves and/or increase our capital contributions to our insurance subsidiaries, either of which could have a material adverse effect on our results of operations or financial condition.

Our net periodic benefit costs and the value of our benefit obligations for our pension plans are determined based on a set of economic and demographic assumptions that represent our best estimate of future expected experience. Major assumptions used in accounting for these plans include the expected discount (interest) rate and the long-term rate of return on plan assets. We set the discount rate assumption at the measurement date for each of our plans to reflect the yield of a portfolio of high quality fixed income debt instruments matched against the timing and amounts of projected future benefits. A lower discount rate increases the present value of benefit obligations and increases our costs. Our expectations for the future investment returns of plan assets are based on a combination of historical market performance, evaluations of investment forecasts obtained from external consultants and economists, and current market yields. The rate of return on pension plan assets is determined based on the fair value of the plan assets at the beginning and end of the measurement period. Declines in long-term interest rates or the fair value of our plan assets may result in a decrease in the funded status of our pension plans and/or increased pension costs, which may adversely affect our results of operations, financial condition, or liquidity. Conversely, a rise in interest rates could unfavorably impact the fair value of certain investments in our pension plans.

See "Reserves for Policy and Contract Benefits" contained herein in Item 1, "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7, "Interest Rate Risk" contained herein in Item 7A, and Note 9 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

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Actual claim experience may differ from our reserve assumptions which may adversely affect our results of operations or financial condition.

In recent years, we have experienced volatility in risk results in various lines of business. Historical results may not be indicative of future performance due to, among other things, changes in our mix of business, re-pricing of certain lines of business, or any number of economic cyclical effects on our business. Reserves, whether calculated under GAAP or statutory accounting principles, do not represent an exact calculation of future benefit liabilities but are instead estimates made by us using actuarial and statistical procedures. Actual claim experience may differ from our reserve assumptions. There can be no assurance that our reserves will be sufficient to fund our future liabilities in all circumstances. Future loss development may require reserves to be increased, which would adversely affect earnings in current and future periods. Life expectancies may continue to increase, which could lengthen the time a claimant receives disability or long-term care benefits and could result in a change in mortality assumptions and an increase in reserves for these and other long-tailed products. Adjustments to reserve amounts may also be required in the event of changes from the assumptions regarding future morbidity (the incidence of claims and the rate of recovery, including the effects thereon of inflation and other societal and economic factors); persistency; policy benefit offsets, including those for social security and other government-based welfare benefits; and interest rates used in calculating the reserve amounts, which could have a material adverse effect on our results of operations or financial condition.

See "Reserves for Policy and Contract Benefits" contained herein in Item 1, "Executive Summary" and "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7, and Notes 1 and 6 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

We and our insurance subsidiaries are subject to extensive supervision and regulation, which may affect the cost or demand for our products, increase capital requirements for our insurance subsidiaries, and adversely affect our profitability, liquidity, or growth.

Our insurance subsidiaries are subject to extensive supervision and regulation in the United States and abroad. The primary purpose of insurance regulation is to protect policyholders, not stockholders. To that end, applicable laws establish regulatory authorities, including state insurance departments in the United States and the PRA in the United Kingdom, with broad administrative powers over many aspects of the insurance business. For example, our insurance subsidiaries may not be able to obtain or maintain necessary licenses, permits, authorizations, or accreditations, or may be able to do so only at great cost. In addition, we and our insurance subsidiaries may not be able to comply fully with, or obtain appropriate exemptions from, the wide variety of laws and regulations applicable to insurance companies and insurance holding companies. These laws and regulations can be complex and subject to differing interpretations and are regularly re-examined. Existing or future laws and regulations may become more restrictive or otherwise adversely affect our operations. For example, they may restrict or prohibit the payment of dividends by our subsidiaries to us, restrict transactions between subsidiaries and/or between us and our subsidiaries, and may require contributions of capital by us to our insurance subsidiaries even if we are otherwise in compliance with stated requirements. Failure to comply with or to obtain appropriate exemptions under any applicable laws or regulations could result in restrictions on the ability of our insurance subsidiaries to do business in one or more of the jurisdictions in which they operate and could result in fines and other sanctions, which may have a material adverse effect on our business or results of operations.

It is possible that there will be heightened oversight of insurers by regulatory authorities in the jurisdictions in which our insurance subsidiaries are domiciled and operate. We cannot predict specific proposals that might be adopted, or what impact, if any, such proposals or, if enacted, such laws, could have on our business, results of operations, or financial condition. The NAIC or state regulators may adopt revisions to the RBC formula, the PRA may revise its capital adequacy requirements and minimum solvency margins, or rating agencies may incorporate higher capital thresholds into their quantitative analyses, thus requiring additional capital contributions by us to our insurance subsidiaries. Increased financial services regulation, such as the NAIC Solvency Modernization Initiative and the European Commission's Solvency II directive, may impose greater quantitative requirements, supervisory review, and disclosure requirements and may impact the business strategies, capital requirements, and profitability of our insurance subsidiaries. New programs, including healthcare reform and financial services sector reform, may compete with or diminish the need or demand for our products, particularly as it may affect our ability to sell our products through employers or in the workplace. For example, although the Patient Protection and Affordable Care Act (PPACA) reforms the business of health insurance and does not directly affect our insurance products, we believe it has indirectly led to lower product sales in recent periods as the attention of our brokers, agents, and customers has been diverted toward compliance with the legislation.

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We use affiliated captive reinsurers for the limited purpose of reinsuring risks attributable to specified policies issued or reinsured by our insurance subsidiaries in order to effectively manage risks in connection with certain blocks of our business as well as to enhance our capital efficiency. If we were required to discontinue use of the captive reinsurers or to alter the structure of the captive reinsurance arrangements, our ability to maintain current risk-based capital (RBC) ratios and/or our capital deployment activities could be adversely affected. No changes in the use or regulation of captive reinsurers have been proposed by the NAIC, and it is too early to predict the potential impact of any changes that might be made.

Legislative changes related to pension funding requirements could negatively impact our cash flows from operations and our profitability. Changes in tax laws and other regulations or interpretations of such laws or regulations could increase our corporate taxes. Furthermore, the value of deferred tax assets could be impacted by our future earnings levels. Changes in tax laws could also make some of our products less attractive to consumers. We cannot predict whether any tax legislation impacting corporate taxes or insurance products will be enacted, what the specific terms of any such legislation will be, or whether, if at all, any legislation would have a material adverse effect on our financial condition or results of operations.  

Dodd-Frank directs existing and recently created government agencies and bodies to promulgate regulations implementing the law, an ongoing process anticipated to continue over the next few years. As a result of the regulations implemented thus far, regulations directed at some derivative activities and the implementation of central clearing rules have increased the cost of some hedging activities primarily as a result of more restrictive collateral requirements. We cannot predict the requirements of the remaining regulations that will ultimately be adopted or how or whether such regulations will affect our businesses, results of operations, cash flows, or financial condition, require us to raise additional capital, or result in a downgrade of our credit ratings.

Most group long-term and short-term disability plans we administer are governed by the Employee Retirement Income Security Act (ERISA). Changes to ERISA enacted by Congress or through judicial interpretations may adversely affect the risk to us of managing employee benefit plans, increase the premiums associated with such plans, and ultimately affect their affordability and our profitability.

The insurance departments in jurisdictions wherein our insurance subsidiaries conduct business may limit our ability to obtain rate increases under guaranteed renewable contracts or could require changes in rates and/or benefits to meet minimum loss ratio requirements which could negatively impact the profitability of our products. Many regulatory and governmental bodies have the authority to review our products and business practices and those of our agents and employees. These regulatory or governmental bodies may bring regulatory or other legal actions against us if, in their view, our practices are improper. These actions could result in substantial fines or restrictions on our business activities and could have a material adverse effect on our business or results of operations.

Regulatory examinations or investigations could result in, among other things, changes in our claims handling or other business practices, changes in procedures for the identification and payment to the states of benefits and other property that is not claimed by the owners, changes in the use and oversight of reinsurance, increases to reserving requirements, changes in governance and other oversight procedures, assessments by tax authorities or other governing agencies, fines, and other administrative action, which could injure our reputation, adversely affect our issuer credit ratings and financial strength ratings, place us at a competitive disadvantage in marketing or administering our products, impair our ability to sell or retain insurance policies, and/or have a material adverse effect on our results of operations or financial condition. Determination by regulatory authorities that we have engaged in improper conduct may also adversely affect our defense of various lawsuits.

See "Regulation" contained herein in Item 1 and Notes 7 and 14 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

In addition to interest rate risk as previously discussed, we are exposed to other risks related to our investment portfolio which may adversely affect our results of operations, financial condition, or liquidity.

Default Risk

Our investment portfolio consists primarily of fixed maturity securities. These securities are issued by both domestic and foreign entities and are backed either by collateral or the credit of the underlying issuer. Factors such as an economic downturn or political change in the country of the issuer, a regulatory change pertaining to the issuer's industry, a significant deterioration in the cash flows of the issuer, unforeseen accounting irregularities or fraud committed by the issuer, widening risk spreads, ratings downgrades, a change in the issuer's marketplace or business prospects, or other events that adversely affect the issuers of these securities may result in the issuer defaulting on its obligations.

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Our mortgage loan portfolio has default risk. Events or developments, such as economic conditions that impact the ability of tenants to pay their rents or limit the availability of refinancing, may have a negative effect on our mortgage loan portfolio. Events or developments that have a negative effect on any particular geographic region or sector may have a greater adverse effect on an investment portfolio to the extent that the portfolio is concentrated in that region or sector.

A default results in the recognition of an other-than-temporary impairment loss on the investment. A default may also adversely affect our ability to collect principal and interest due to us. The probability of credit downgrades and defaults increases when the fixed income markets experience periods of volatility and illiquidity.

Credit Spread Risk

Our exposure to credit spreads, which is the yield above comparable Treasury securities, primarily relates to market price and cash flow variability associated with changes in credit spreads. A widening of credit spreads may unfavorably impact the net unrealized gain or loss position of the investment portfolio and may adversely impact liquidity. Credit spread tightening may reduce net investment income associated with new purchases of fixed income securities.

Valuation Risk

We report our fixed maturity securities and certain other financial instruments at fair value. Valuations may include inputs and assumptions that are less observable or require greater estimation, particularly during periods of market disruption, resulting in values which may be less than the value at which the investments may ultimately be sold. Further, rapidly changing and unprecedented credit and equity market conditions could materially impact the valuation of securities as reported in our financial statements, and the period to period changes in value could vary significantly. Decreases in value may have a material adverse effect on our results of operations or financial condition.

We evaluate our investment portfolio for impairments. There can be no assurance that we have accurately assessed the level of impairments taken. Additional impairments may need to be taken in the future, and historical trends may not be indicative of future impairments. Any event reducing the value of our securities other than on a temporary basis may have a material adverse effect on our business, results of operations, or financial condition.

Market Timing and Liquidity Risk

While we attempt to match our asset cash flows and durations with expected liability cash flows and durations to meet the funding requirements of our business, there may at times be a lack of appropriate investments in the market which can be acquired. In addition, we may in certain circumstances need to sell investments due to changes in regulatory or capital requirements, changes in tax laws, rating agency decisions, and/or unexpected changes in liquidity needs. There may also be a limited market for certain of our investments, such as our private placement fixed maturity securities, mortgage loans, and policy loans, which makes them more illiquid. In periods of market volatility or disruption, other of our securities may also experience reduced liquidity. If events occur wherein we need to sell securities in an unfavorable interest rate or credit environment or need to quickly sell securities which are illiquid, market prices may be lower than what we might realize under normal circumstances, with a resulting adverse effect on our results of operations, financial condition, or liquidity.

See "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 and Notes 1, 2, 3, and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of our investments and derivatives. 

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The failure of cyber or other information security systems, as well as the occurrence of events unanticipated in our disaster recovery systems, could result in a loss or disclosure of confidential information, damage to our reputation and impairment of our ability to conduct business effectively, which could adversely affect our results of operations or financial condition.

We rely heavily on the effective operation of our information technology systems to administer almost every aspect of our business. We also store confidential policyholder and employee information and other proprietary information on our systems as a part of our normal business operations. These systems may fail to operate properly or become disabled as a result of events or circumstances wholly or partly beyond our control. We maintain security systems and implement measures to protect our information technology systems and data, but they may be insufficient to prevent physical and electronic break-ins, computer viruses or other malicious code, cyber attacks, and similar disruptions from unauthorized tampering. These threats may originate externally, such as from cyber criminals or other hackers, or internally from within our company, such as from employee error or malfeasance. In some cases we may be unaware of emerging threats and the magnitude of their effects, or we may not become aware of a cyber incident for some time after it occurs, which could increase our exposure.

In the event of a disaster such as a natural catastrophe, an epidemic, a cyber attack, cyber security breach or other information technology systems failure, a terrorist attack, or war, unanticipated problems with our disaster recovery systems could have a material adverse impact on our ability to conduct business and on our results of operations and financial condition, particularly if those problems affect our information technology systems and destroy valuable data. In addition, in the event that a significant number of our employees were unavailable in the event of a disaster, our ability to effectively conduct business could be severely compromised.

The failure of our information technology and/or disaster recovery systems for any reason could cause significant interruptions or malfunctions in our or our customers’ operations and result in the loss, theft, or failure to maintain the security, confidentiality or privacy of sensitive data, including personal information relating to our customers. Such a failure could harm our reputation, subject us to regulatory sanctions, legal claims, and increased expenses, lead to a loss of customers and revenues, and otherwise adversely impact our profitability and our business. While we maintain cyber liability insurance that provides coverage for network security, privacy liability, technology errors and omissions, media liability, first party network business interruption, electronic restoration, and cyber extortion (including sub-limits for credit monitoring, notification costs, regulatory expense, and investigative expense), our insurance may not provide adequate loss coverage in all circumstances.

The effectiveness of our hedging programs may be affected by changes in the economic environment, changes in interest rates, capital market volatility, non-performance by our counterparties, changes in the level of required collateral, or regulation, which may adversely affect our results of operations, financial condition, or liquidity.

We use derivative financial instruments to help us manage certain risks related to our business operations, primarily interest rate risk, risk related to matching duration for our assets and liabilities, and foreign currency risk. Factors associated with derivative financial instruments could adversely affect our results of operations, financial condition, or liquidity. Ineffectiveness of our hedges due to changes in expected future events, such as the risk created by uncertainty in the economic environment or if our counterparties fail or refuse to honor their obligations under these derivative instruments, may have a material adverse effect on our results of operations or financial condition. Capital market turmoil may result in an increase in the risk of non-performance by our counterparties, many of which are financial institutions. Non-performance by our counterparties may force us to unwind hedges, and we may be unable to replace the hedge, thereby leaving the risk unhedged. Under the terms of our hedging contracts, we are required to post collateral and to maintain a certain level of collateral, which may adversely affect our liquidity and could subject us to the credit risk of the counterparty to the extent it holds such collateral. Changes in regulations may have an adverse effect on our ability to execute hedging strategies due to the increased economic cost of derivatives, primarily as a result of more restrictive collateral requirements.

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Competition may adversely affect our market share or profitability.

All of our businesses are highly competitive. We believe that the principal competitive factors affecting our business are price, quality of customer service and claims management, integrated product choices, financial strength, and claims-paying ratings. We compete for new product sales, the retention of existing business, and the ability to attract and retain independent agents and brokers to market our products, all of which affect our profitability. The level and intensity of competition may grow due to existing competitors becoming more aggressive, new competitors entering the market, including those who enter the market as a result of healthcare reform, and an increase in merger and acquisition activity which may result in larger competitors with greater financial resources. There are many insurance companies which actively compete with us in our lines of business, and there is no assurance that we will be able to compete effectively against these companies and new competitors in the future, which may adversely affect our market share or profitability. See "Competition" contained herein in Item 1 for further discussion.

A decrease in our financial strength or issuer credit ratings may adversely affect our competitive position, our ability to hedge our risks, and our cost of capital or ability to raise capital, which may adversely affect our results of operations, financial condition, or liquidity.

We compete based in part on the financial strength ratings provided by rating agencies. A downgrade of our financial strength ratings may adversely affect us and could potentially, among other things, adversely affect relationships with distributors of our products and services and retention of our sales force, negatively impact persistency and new sales, and generally adversely affect our ability to compete. A downgrade in the issuer credit rating assigned to Unum Group can be expected to adversely affect our cost of capital and our ability to raise additional capital. If we are downgraded significantly, ratings triggers in our derivatives financial instrument contracts may result in our counterparties enforcing their option to terminate the derivative contracts. Such an event may have a material adverse effect on our financial condition or our ability to hedge our risks.

See "Ratings" contained herein in Item 1 and in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 for further discussion.

Events that damage our reputation may adversely affect our business, results of operations, or financial condition.

There are many events which may harm our reputation, including, but not limited to, those discussed in this Item 1A regarding regulatory investigations, legal proceedings, and cyber or other information security incidents.

In addition, as an insurance company, we are paid to accept certain risks. Those who conduct our business, including executive officers and members of management, sales managers, investment professionals, and to some extent, independent agents and brokers, do so in part by making decisions that involve exposing us to risk. These include decisions such as maintaining effective underwriting and pricing discipline, maintaining effective claim management and customer service performance, managing our investment portfolio and derivatives trading activities, delivering effective technology solutions, complying with established sales practices, executing our capital management strategy, exiting a line of business and/or pursuing strategic growth initiatives, and other decisions. Although we employ controls and procedures designed to monitor business decisions and prevent us from taking excessive risks or unintentionally failing to comply with internal policies and practices such that errors occur, there can be no assurance that these controls and procedures will be effective. If our employees and business associates take excessive risks and/or fail to comply with internal policies and practices, the impact of those events may damage our market position and reputation.

Depending on the severity of the damage to our reputation, we may be unable to effectively compete for new products or retain our existing business, which could adversely affect our results of operations or financial condition. Damage to our reputation may also hinder our ability to raise new capital and/or increase our cost of capital. See "Regulation" contained herein in Item 1 and Note 14 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information on regulatory matters and legal proceedings.

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We provide a broad array of disability, long-term care, group life, and voluntary insurance products that are affected by many factors, and changes in any of those factors may adversely affect our results of operations, financial condition, or liquidity.

Disability Insurance

Disability insurance may be affected by a number of social, economic, governmental, competitive, and other factors. Changes in societal attitudes, such as work ethic, motivation, or stability, can significantly affect the demand for and underwriting results from disability products.

Both economic and societal factors can affect claim incidence and recoveries for disability insurance. Claim incidence and claim recovery rates may be influenced by, among other factors, the rate of unemployment and consumer confidence. Claim incidence and claim recovery rates may also be influenced by the emergence of new infectious diseases or illnesses. Claim durations may be extended by medical improvements which could extend life expectancies. The relationship between these and other factors and overall incidence is very complex and will vary due to contract design features and the degree of expertise within the insuring organization to price, underwrite, and adjudicate the claims.

Within the group disability market, pricing and renewal actions can be taken to react to higher claim rates. However, these actions take time to implement, and there is a risk that the market will not sustain increased prices. In addition, changes in economic and external conditions may not manifest themselves in claims experience for an extended period of time. The pricing actions available in the individual disability market differ among product classes. Our individual noncancelable disability policies, in which the policy is guaranteed to be renewable through the life of the policy at a fixed premium, do not permit us to adjust premiums on our in-force business. Guaranteed renewable contracts that are not noncancelable can be re-priced to reflect adverse experience, but rate changes cannot be implemented as quickly as in the group disability market.

Long-term Care Insurance

Long-term care insurance can be affected by a number of demographic, medical, economic, governmental, competitive, and other factors. Because long-term care insurance is a relatively new product for the insurance industry and is long-duration in nature, there is not as much historical data as is available for our other products. This creates a level of uncertainty in properly pricing the product and using appropriate assumptions when establishing reserves. Long-term care insurance is guaranteed renewable and can be re-priced to reflect adverse experience, but the re-pricing is subject to regulatory approval by our states of domicile and may also be subject to approval by jurisdictions in which our policyholders reside, which can affect the length of time in which the re-pricing can be implemented, if at all. We monitor our own experience and industry studies concerning morbidity, mortality, and policyholder terminations to understand emerging trends.  Changes in actual experience relative to our expectations may adversely affect our profitability and reserves.  Mortality continues to improve for the general population, and life expectancy has increased, which could lengthen the time a claimant receives long-term care benefits and may subject more policyholders to advanced aging and an associated increase in claims incidence. Medical advances may continue to have an impact on claim incidence and duration, both favorable and unfavorable. Due to the long duration of the product, the timing and/or amount of our investment cash flows may not match those of our maturing liabilities. Sustained periods of low interest rates could result in increases in reserves and adversely affect our results of operations.

Group Life Insurance

Group life insurance may be affected bythe characteristics of the employees insured, the amount of insurance employees may elect voluntarily, our risk selection process, our ability to retain employer groups with favorable risk characteristics, the geographical concentration of employees, and mortality rates. Claim incidence may also be influenced by unexpected catastrophic events such as terrorist attacks, natural disasters, and pandemic health events, which may also affect the cost of and availability of reinsurance coverage. There are a series of lawsuits challenging the use of retained asset accounts in group life plans that are governed by ERISA. If these challenges are upheld by the courts, our ability to use such accounts for the beneficiaries of these plans may be adversely affected.

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Voluntary Products

Voluntary products sold in the workplace may be affected by the characteristics of the employees insured, the level of employee participation and the amount of insurance the employees elect, our risk selection process, and our ability to retain employer groups with favorable risk characteristics.  Our voluntary life insurance products generally include interest-sensitive forms of insurance which contain a guaranteed minimum interest crediting rate. It is possible that our investment returns could be lower than the guaranteed crediting rate.  The non-life contracts are guaranteed renewable and can be repriced to reflect adverse experience, but rate changes cannot be implemented as quickly as for group disability and group life products.

See "Reserves for Policy and Contract Benefits" contained herein in Item 1 and "Executive Summary" and "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 for further discussion.

Our risk management program may leave us exposed to unidentified or unanticipated risk, which could negatively affect our business.

We have devoted significant resources to develop our enterprise risk management program, which has the objective of managing our strategic, market, credit, insurance, operations, capital and liquidity, and reputational risks. However, our program may not be comprehensive, and our methods for monitoring and managing risk may not fully predict or mitigate future exposures. See "Quantitative and Qualitative Disclosures About Market Risk" contained herein in Item 7A for further information about our risk management program.

Litigation and contingencies are common in our businesses and may result in financial losses and/or harm to our reputation.

We are, and in the future may be, defendants in a number of litigation matters, and the outcome of this litigation is uncertain.  Some of these proceedings have been brought on behalf of various alleged classes of complainants. Plaintiffs in class action and other lawsuits against us may seek very large and/or indeterminate amounts, including punitive and treble damages. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. An adverse outcome in one or more of these actions may, depending on the nature, scope and amount of the ruling, materially and adversely affect our results of operations or financial condition, encourage other litigation, and limit our ability to write new business, particularly if the adverse outcomes negatively impact certain of our ratings.

As part of our normal operations in managing claims, we are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Typically those lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages may, from time to time, have a material adverse effect on our results of operations. We are unable to estimate a range of reasonably possible punitive losses.

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. In addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years. During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established additional reserves for payment of these benefits. Similar to other insurers, we are undergoing an examination by a third party acting on behalf of a number of state treasurers concerning our compliance with the unclaimed property laws of the participating states. We are cooperating fully with this examination, as well as with a Delaware Market Conduct examination and a Voluntary Disclosure Agreement process with the state of Minnesota. The legal and regulatory environment around unclaimed death benefits continues to evolve. It is possible that the current examination and/or similar investigations by other state jurisdictions may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties, the total of which may be in excess of the reserves established.

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See "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 and Note 14 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information on legal proceedings.

Changes in accounting standards may materially affect our financial statements.

Our financial statements are subject to the application of generally accepted accounting principles, in both the United States and the United Kingdom, which are periodically revised and/or expanded. Accordingly, we are required to adopt new or revised accounting standards issued by recognized authoritative bodies, including the U.S. Financial Accounting Standards Board (FASB), the U.K. Accounting Standards Board (ASB), and the NAIC. Accounting standards issued by the FASB and ASB may be influenced by the International Accounting Standards Board (IASB). These authoritative bodies have several ongoing projects regarding accounting standards that will likely be adopted in the near future. Future accounting standards we adopt will change current accounting and disclosure requirements applicable to our financial statements. Such changes may have a material effect on our reported results of operations or financial condition.

Currency translation could materially impact our reported operating results.

The functional currency of our U.K. operations is the British pound sterling. Fluctuations in the pound to dollar exchange rate have an effect on our financial results. In periods when the pound weakens, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens, translating pounds into dollars increases current period results in relation to the prior period. However, it is important to distinguish between translating and converting foreign currency. Except for a limited number of transactions, we do not actually convert pounds into dollars. As a result, we view foreign currency translation as a financial reporting item and not a reflection of operations or profitability in the U.K.

Our ability to finance our ongoing operations may not always be possible solely from internal sources of capital and liquidity. If we need to seek external capital, there is the risk that adverse market conditions may significantly affect our access to capital or our cost of capital.

A change in demand for our insurance products or an increase in the incidence of new claims or the duration of existing claims could negatively impact our cash flows from operations. Deterioration in the credit market, which could delay our ability to sell our positions in certain of our fixed maturity securities in a timely manner, could also negatively impact our cash flows. Regulatory changes such as those discussed herein in this Item 1A may impose higher capital or reserve requirements on our insurance subsidiaries, increase collateral requirements for certain of our derivatives transactions, and/or implement other requirements which could unfavorably affect our liquidity. Without sufficient liquidity, our ability to maintain and grow our operations would be limited. If our internal sources of liquidity prove to be insufficient, we may be unable to successfully obtain additional financing and capital on favorable terms, or at all, which may adversely affect us.

If our financial results are unfavorable, we may need to increase our capital in order to maintain our credit ratings or satisfy regulatory requirements. Maintaining appropriate levels of statutory surplus is considered important not only by us but by insurance regulatory authorities in the U.S., the PRA in the U.K., and the rating agencies that rate insurers' claims-paying abilities and financial strength. Failure to maintain certain levels of statutory surplus could result in increased regulatory scrutiny, action by regulatory authorities, or a downgrade by the rating agencies. Need for additional capital may limit a subsidiary's ability to distribute funds to our holding companies.

Obtaining financing for even a small amount of capital could be complicated in unfavorable market conditions and during periods of economic uncertainty. The markets may exert downward pressure on availability of liquidity and credit capacity for certain issuers. The availability of financing will depend on a variety of factors such as market conditions, the general availability of credit, the overall availability of credit to the financial services industry, our credit ratings and credit capacity, and the possibility that customers or lenders could develop a negative perception of our financial prospects. Similarly, our access to funds may be impaired if regulatory authorities or rating agencies take negative actions against us. Raising capital in unfavorable market conditions could increase our interest expense or negatively impact our shareholders through increased dilution of their common stock in Unum Group.

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We rely on our credit facility as a potential source of liquidity. Our right to borrow funds under this facility is subject to financial covenants, negative covenants, and events of default. Our ability to borrow under this facility is also subject to the continued willingness and ability of the lenders to provide funds. Our failure to comply with the covenants in the credit facility or the failure of lenders to fund their lending commitments would restrict our ability to access this facility when needed, with a resulting adverse effect on our results of operations, financial condition, or liquidity.

See "Liquidity and Capital Resources" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 and Notes 8 and 15 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

As a holding company, Unum Group depends on the ability of its subsidiaries to transfer funds to it so that it can meet its obligations and pay dividends.

Unum Group is a holding company for insurance and other subsidiaries and has no significant operations of its own. Our insurance subsidiaries are subject to insurance laws and regulatory limitations on the payment of dividends and on other transfers of funds or other assets to affiliates, including to Unum Group. The level of earnings and capital in our subsidiaries, as well as business conditions and rating agency considerations, could impact our insurance and other subsidiaries' ability to pay dividends or to make other transfers of funds to Unum Group, which could impair our ability to pay dividends to Unum Group's common stockholders, meet our debt and other payment obligations, and/or repurchase shares of Unum Group's common stock.

See "Regulation" contained herein in Item 1,"Liquidity and Capital Resources" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7, and Note 15 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

Reinsurance may not be available or affordable, or reinsurers may be unwilling or unable to meet their obligations under our reinsurance contracts, which may adversely affect our results of operations or financial condition.

As part of our overall risk management and capital management strategies, we purchase reinsurance for certain risks underwritten by our various businesses. Market conditions beyond our control determine the availability and cost of reinsurance. Any decrease in the amount of reinsurance will increase our risk of loss and may impact the level of capital requirements for our insurance subsidiaries, and any increase in the cost of reinsurance will, absent a decrease in the amount of reinsurance, reduce our results of operations. Accordingly, we may be forced to incur additional expenses for reinsurance or may be unable to obtain sufficient reinsurance on acceptable terms, which may adversely affect our ability to write future business, result in the assumption of more risk with respect to the policies we issue, and increase our capital requirements. The collectibility of our reinsurance recoverable is primarily a function of the solvency of the individual reinsurers. We cannot provide assurance that our reinsurers will pay the reinsurance recoverables owed to us or that they will pay these recoverables on a timely basis. The insolvency of a reinsurer or the inability or unwillingness of a reinsurer to comply with the terms of a reinsurance contract may have an adverse effect on our results of operations or financial condition.

We have assets which may not be fully recoverable or realizable, which could adversely affect our results of operations or financial condition.

If our business does not perform well or as initially anticipated in our assumptions, we may be required to accelerate amortization or recognize an impairment loss on intangible assets or long-lived assets or to establish a valuation allowance against the deferred income tax asset.

We have intangible assets such as deferred acquisition costs (DAC), value of business acquired (VOBA), and goodwill. DAC and VOBA are amortized based primarily upon expected future premium income of the related insurance policies. Recoverability testing for DAC and VOBA is performed on an annual basis. Insurance contracts are grouped on a basis consistent with our manner of acquiring, servicing, and measuring profitability of the contracts. If recoverability testing indicates that either DAC and/or VOBA are not recoverable, the deficiency is charged to expense.

Goodwill is not amortized, but on an annual basis, or more frequently if necessary, we review the carrying amount of goodwill for indications of impairment, considering in that review the financial performance and other relevant factors. In accordance with accounting guidance, we test for impairment at either the operating segment level or one level below. In addition, certain events including, but not limited to, a significant adverse change in legal factors or the business environment, an adverse action by a regulator or rating agency, or unanticipated competition would cause us to review goodwill for impairment more frequently than annually.

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Long-lived assets, including assets such as real estate and information technology software, also require impairment testing to determine whether changes in circumstances indicate that we may be unable to recover the carrying amount.

We assess our deferred tax assets to determine if they are realizable. Factors in our determination include the performance of the business, including the ability to generate future taxable income. If based on available information, it is more likely than not that the deferred income tax asset will not be realized, a valuation allowance is established with a corresponding charge to net income.

Charges such as accelerated amortization, impairment losses, or the establishment of valuation allowances could have a material adverse effect on our results of operations or financial condition.

See "Executive Summary" and "Critical Accounting Estimates" included in "Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein in Item 7 and Notes 1, 7, and 13 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

The continued threat of terrorism and ongoing military actions may adversely affect the value of certain assets in our investment portfolio, disrupt our operations, or result in higher claim costs.

The continued threat of terrorism, both within the U.S. and abroad, ongoing military actions, and heightened security measures in response to these types of threats may cause significant volatility in the global financial markets and result in loss of life, property damage, business disruption, and reduced economic activity. Some of the assets in our investment portfolio may be adversely affected by declines in the credit and equity markets and reduced economic activity caused by the continued threat of terrorism. Terrorist actions also could disrupt our operations centers in the U.S. or abroad. In addition, the occurrence of terrorist actions could result in higher claims under our insurance policies than anticipated. Beyond obtaining insurance coverage for our facilities, there are few, if any, commercial options through which to transfer the exposure from extreme events away from us. We purchase reinsurance protection against catastrophic disaster events, including terrorism. The continued threat of terrorism could result in increased reinsurance prices and reduced insurance coverage and potentially cause us to retain more risk than we otherwise would retain if we were able to obtain reinsurance at lower prices. See "Reinsurance" contained herein in Item 1 for further discussion.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None

ITEM 2. PROPERTIES

We occupy approximately 2.4 million square feet of space at our four major United States operating centers located in Chattanooga, Tennessee; Portland, Maine; Worcester, Massachusetts; and Columbia, South Carolina.

We own and occupy two connected buildings in Chattanooga, Tennessee, with approximately 861,000 square feet of office space. We own and occupy five facilities in Portland, Maine, with approximately 838,000 square feet of office space. We lease and occupy approximately 167,000 square feet of office space in Worcester, Massachusetts. These properties are used primarily for operations supporting our Unum US, Closed Block, and Corporate segments.

We own and occupy approximately 523,000 square feet of office space in Columbia, South Carolina, used primarily for operations supporting our Colonial Life segment.

We also occupy office buildings in the United Kingdom which serve as the home offices supporting our Unum UK segment. We own and occupy property located in Dorking, with approximately 69,000 square feet of office space. In addition, approximately 68,000 square feet of office space is leased and occupied in two office buildings located in Bristol and Basingstoke.

Additionally, we lease other office space, for periods principally from five to fifteen years, for use by our affiliates and sales forces.

Our properties and facilities are suitable and adequate for current operations.

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ITEM 3. LEGAL PROCEEDINGS

Refer to Note 14 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for information on legal proceedings.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Common stock of Unum Group is traded on the New York Stock Exchange. The stock symbol is "UNM". Quarterly market prices and dividends declared and paid per share of common stock are as follows:

	Market Price
	High		Low		Dividend
2013
4th Quarter	$	35.40	$	29.45	$	0.1450
3rd Quarter	32.94		29.14		0.1450
2nd Quarter	29.92		25.55		0.1300
1st Quarter	28.34		21.18		0.1300
2012
4th Quarter	$	21.35	$	19.04	$	0.1300
3rd Quarter	20.92		18.28		0.1300
2nd Quarter	24.77		18.37		0.1050
1st Quarter	24.81		20.84		0.1050

Our board of directors has the authority to declare cash dividends on shares of our common stock. In determining dividends, the board takes into account a number of factors including our financial condition and results of operations, regulatory limitations on the payment of dividends from subsidiaries, cash requirements, general economic conditions, and other factors the board may deem relevant.  For information on restrictions relating to our subsidiaries' ability to pay dividends to Unum Group and certain of its intermediate holding company subsidiaries, see "Liquidity and Capital Resources - Cash Available from Subsidiaries" contained herein in Item 7 and Note 15 of the "Notes to Consolidated Financial Statements" contained herein in Item 8. For information relating to compensation plans under which Unum Group's equity securities are authorized for issuance, see Item 12 contained herein.

As of February 24, 2014, there were 12,190 registered holders of common stock. 

The following table provides information about our share repurchase activity for the fourth quarter of 2013:

	(a) Total Number of Shares Purchased	(b) Average Price Paid per Share (1)		(c) Total Number of Shares Purchased as Part of Publicly Announced Program (2)	(d) Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program (2)
October 1 - October 31, 2013	—	$	—	—	$	281,597,142
November 1 - November 30, 2013	450,600	33.30		450,600	266,593,682
December 1 - December 31, 2013	1,020,900	34.28		1,020,900	729,967,795
Total	1,471,500			1,471,500

(1) The average price paid per share excludes the cost of commissions.

(2) In December 2013, our board of directors authorized the repurchase of up to $750 million of Unum Group's common stock through June 12, 2015. This new authorization replaced the previous authorization of $750 million that was authorized in July 2012 and scheduled to expire on January 31, 2014.

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ITEM 6. SELECTED FINANCIAL DATA

(in millions of dollars, except share data)
	At or for the Year Ended December 31
	2013		2012		2011			2010		2009
Income Statement Data
Revenue
Premium Income	$	7,624.7	$	7,716.1	$	7,514.2		$	7,431.4	$	7,475.5
Net Investment Income	2,492.1		2,515.2		2,519.6			2,495.5		2,346.6
Net Realized Investment Gain (Loss)	6.8		56.2		(4.9		)	24.7		11.7
Other Income	230.2		227.9		249.1			241.6		257.2
Total	10,353.8		10,515.4		10,278.0			10,193.2		10,091.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits (1)	6,595.7		6,722.2		7,209.5			6,354.1		6,291.6
Commissions	909.5		917.2		879.2			855.4		837.1
Interest and Debt Expense	149.4		145.4		143.3			141.8		125.4
Other Expenses (2)	1,494.0		1,481.1		1,712.7			1,522.0		1,553.0
Total	9,148.6		9,265.9		9,944.7			8,873.3		8,807.1
Income Before Income Tax	1,205.2		1,249.5		333.3			1,319.9		1,283.9
Income Tax	347.1		355.1		49.1			441.2		436.6
Net Income	$	858.1	$	894.4	$	284.2		$	878.7	$	847.3
Balance Sheet Data
Assets	$	59,403.6	$	62,236.1	$	59,555.2		$	56,602.7	$	53,778.8
Long-term Debt	$	2,612.0	$	2,755.4	$	2,570.2		$	2,631.3	$	2,549.6
Accumulated Other Comprehensive Income	$	255.0	$	628.0	$	461.8		$	351.4	$	347.5
Other Stockholders' Equity	8,404.1		7,984.6		7,707.9			8,133.5		7,697.5
Total Stockholders' Equity	$	8,659.1	$	8,612.6	$	8,169.7		$	8,484.9	$	8,045.0
Per Share Data
Net Income
Basic	$	3.24	$	3.18	$	0.94		$	2.70	$	2.56
Assuming Dilution	$	3.23	$	3.17	$	0.94		$	2.69	$	2.55
Stockholders' Equity	$	33.30	$	31.87	$	27.91		$	26.80	$	24.25
Cash Dividends	$	0.550	$	0.470	$	0.395		$	0.350	$	0.315
Weighted Average Common Shares Outstanding
Basic (000s)	264,725.8		281,355.9		302,399.8			325,839.0		331,266.2
Assuming Dilution (000s)	265,949.2		281,756.8		303,571.0			327,221.1		332,136.2

(1) Included is a reserve increase of $573.6 million in 2011 related to our long-term care closed block business and a reserve increase of $183.5 million in 2011 related to our individual disability closed block business. See Note 6 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

(2) Includes the net increase in deferred acquisition costs, compensation expense, and other expenses. Included in these expenses is a charge of $196.0 million in 2011 related to the impairment of long-term care closed block deferred acquisition costs. See Note 6 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The discussion and analysis presented in this section should be read in conjunction with the "Cautionary Statement Regarding Forward-Looking Statements" included below the Table of Contents, "Risk Factors" included in Item 1A, "Selected Financial Data" included in Item 6, and the Consolidated Financial Statements and notes thereto included in Item 8.

Executive Summary

Throughout 2013, we remained focused on profitable top-line growth in select markets and a disciplined investment strategy, as we continued to drive effectiveness in our operating performance and to generate consistent, sustainable capital available for deployment. A discussion of our operating performance and capital management follows.

2013 Operating Performance and Capital Management

For 2013, we reported net income of $858.1 million, or $3.23 per diluted common share, compared to net income of $894.4 million, or $3.17 per diluted common share, in 2012. Included in these results are net realized investment gains and losses and non-operating retirement-related gains or losses. Also included are fourth quarter 2013 adjustments for a reserve increase related to unclaimed death benefits ($95.5 million before tax and $62.1 million after tax, or $0.24 per diluted common share) and a reserve reduction related to group life waiver of premium benefits ($85.0 million before tax and $55.2 million after tax, or $0.21 per diluted common share). Adjusting for these items, after-tax operating income was $882.5 million, or $3.32 per diluted common share, in 2013, compared to $887.5 million, or $3.15 per diluted common share, in 2012.

Total operating revenue, which excludes net realized investment gains and losses, was 1.1 percent lower in 2013 relative to 2012, with slight declines in both premium income and net investment income. Total operating income, excluding net realized investment gains and losses, non-operating retirement-related gains or losses, and income taxes, decreased by 0.7 percent compared to 2012. Operating income, when also excluding the 2013 reserve adjustments related to unclaimed death benefits and group life waiver of premium benefits, increased slightly relative to 2012, with favorable earnings in all of our segments other than our Corporate segment. Earnings per share were also favorably impacted by our capital management strategy of returning capital to shareholders through repurchases of our common stock. See additional information in "2013 Unclaimed Death Benefits Reserve Increase," "2013 Group Life Waiver of Premium Benefit Reserve Reduction," "Consolidated Operating Results," and "Reconciliation of Non-GAAP Financial Measures" contained herein in Item 7.

Our Unum US segment reported an increase in operating income, including the 2013 reserve adjustments related to unclaimed death benefits and group life waiver of premium benefits, of 2.5 percent in 2013 compared to 2012. Operating income excluding these reserve adjustments increased 1.4 percent, with growth in premium income and overall favorable risk results. Premium income increased 1.4 percent in 2013 compared to 2012, as we believe the weak pace of economic growth, low levels of employment growth, the competitive environment, and the distraction caused by political instability and the implementation of healthcare reform continued to pressure our sales and premium income growth throughout 2013. The benefit ratio for our Unum US segment for 2013 was 71.3 percent, or 71.6 percent excluding the reserve adjustments, compared to 72.7 percent in 2012. Unum US sales decreased 2.0 percent in 2013 compared to 2012. Although persistency declined slightly during 2013 relative to 2012, our persistency remains strong and is generally consistent with our expectations.

Our Unum UK segment reported an increase in operating income, as measured in Unum UK's local currency, of 1.7 percent in 2013 compared to 2012, with overall favorable risk results. Premium income in local currency declined 18.8 percent in 2013 relative to 2012 due primarily to reinsurance agreements entered into effective January 1, 2013 to cede an additional portion of our group life business. The reinsurance agreements significantly decreased premium income and benefit payments for group life during 2013 and also reduced volatility in this line of business. The decline in the benefit ratio for Unum UK to 74.3 percent in 2013 from 77.9 percent, in 2012 was due primarily to improved risk results in the group life product line. Unum UK sales in 2013 decreased 18.7 percent, in local currency, in 2013 compared to 2012 due primarily to lower group life sales as we continued to execute our plans to improve new business pricing and reposition our group life business for better margins and greater stability. Persistency declined, as expected, primarily as a result of pursuing rate increases on renewing business.

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Our Colonial Life segment reported a decrease in operating income, including the 2013 reserve increase related to unclaimed death benefits, of 3.5 percent in 2013 compared to 2012. Operating income excluding this reserve adjustment increased 3.9 percent in 2013, with higher operating revenue and stable risk results. Premium income grew 3.2 percent in 2013 compared to 2012. The 2013 benefit ratio for Colonial Life was 54.1 percent, and excluding the reserve increase was 52.5 percent, consistent with the level of 2012. Colonial Life sales increased 1.6 percent in 2013 compared to 2012, driven by higher large case commercial market sales. Persistency in 2013 declined slightly but remains strong for all lines of business.

Our Closed Block segment reported an increase in operating income of 14.6 percent in 2013 relative to 2012. Net investment income increased 3.4 percent in 2013 compared to 2012 due to higher invested asset levels. Risk results in 2013 were slightly favorable for both individual disability and long-term care relative to the prior year.

Our investment portfolio continues to perform well, and our invested asset quality remains strong. The net unrealized gain on our fixed maturity securities was $4.1 billion at December 31, 2013 compared to $7.2 billion at December 31, 2012, with the decline due primarily to an increase in U.S. Treasury rates during 2013.

We believe our capital and financial positions are strong. At December 31, 2013, the risk-based capital (RBC) ratio for our traditional U.S. insurance subsidiaries, calculated on a weighted average basis using the NAIC Company Action Level formula, was approximately 405 percent, compared to 396 percent at December 31, 2012. During 2013, we repurchased 11.2 million shares of Unum Group common stock at a cost of $318.6 million under our share repurchase program. Cash equivalents and marketable securities held at Unum Group and our other intermediate holding companies are a significant source of liquidity for us and were approximately $514 million at December 31, 2013, relative to $805 million at December 31, 2012. The decline was due primarily to repurchases of our common stock and a capital contribution related to our 2013 re-domestication of a captive reinsurance subsidiary.

2013 Unclaimed Death Benefits Reserve Increase

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. We believe adopting this process, which reflects an evolving regulatory and industry practice, is in the best interest of our customers. Therefore, in addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years.

During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established additional reserves for payment of these benefits. Claim reserves were increased $49.1 million for Unum US group life, $26.3 million for Unum US voluntary life, and $20.1 million for Colonial Life voluntary life, for a total reserve increase of $95.5 million. These reserve adjustments decreased net income $62.1 million.

Although the legal and regulatory environment continues to evolve, we believe our decision to adopt this claims practice and establish additional reserves is in the best interests of our customers.

2013 Group Life Waiver of Premium Benefit Reserve Reduction

Within our Unum US segment, we offer group life insurance coverage which consists primarily of renewable term life insurance and includes a provision for waiver of premium, if disabled. The group life waiver of premium benefit (group life waiver) provides for continuation of life insurance coverage when an insured, or the employer on behalf of the insured, is no longer paying premium because the employee is not actively at work due to a disability. The group life waiver claim reserve is the present value of future anticipated death benefits reflecting the probability of death while remaining disabled. Claim reserves are calculated using assumptions based on past experience adjusted for current trends and any other factors that would modify past experience and are subject to revision as current claim experience emerges and alters our view of future expectations.

The two fundamental assumptions in the development of the group life waiver reserve are mortality and recovery. Our emerging experience and that which continues to emerge within the industry indicate an increase in life expectancies, which decreases the ultimate anticipated death benefits to be paid under the group life waiver benefit. Emerging experience also reflects an improvement in claim recovery rates, which also lessens the likelihood of payment of a death benefit while the insured is disabled.

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During the fourth quarter of 2013, we completed a review of our assumptions and modified our mortality and claim recovery assumptions for our Unum US group life waiver reserves and, as a result, reduced the applicable claim reserves by $85.0 million and increased net income $55.2 million.

2013 Retirement Benefit Changes

In 2013, we adopted plan amendments which freeze participation and benefit accruals in our defined benefit pension plans in the U.S. and U.K., effective December 31, 2013 for the U.S. plans and June 30, 2014 for the U.K. plan. As a result of these plan amendments we recognized a net before-tax curtailment gain of $3.0 million during 2013. Because the amendments eliminate all future service accruals subsequent to the effective dates of the amendments, we were also required to remeasure the benefit obligations of our pension plans, which decreased our net pension liability approximately $330 million during 2013, with a corresponding increase in other comprehensive income, less applicable income tax of approximately $115 million. Concurrent with our amendments to our defined benefit pension plans, we adopted amendments to increase the benefits under our defined contribution plans commensurate with the effective dates of the pension plan amendments.

Further discussion is included in "Consolidated Operating Results," "Reconciliation of Non-GAAP Financial Measures," "Segment Results," "Investments," and "Liquidity and Capital Resources" contained in this Item 7 and in the "Notes to Consolidated Financial Statements" contained herein in Item 8.

2011 Long-term Care Strategic Review

Following a comprehensive and strategic review of our long-term care business, in February 2012 we announced that we would discontinue selling group long-term care.  We discontinued selling individual long-term care during 2009. As part of the strategic review, and as is typical in the fourth quarter of each year, we analyzed our reserve assumptions for long-term care in conjunction with our annual loss recognition testing. We generally perform loss recognition tests on our deferred acquisition costs and policy reserves in the fourth quarter of each year, but more frequently if appropriate, using best estimate assumptions as of the date of the test. Included in the analysis was a review of our reserve discount rate assumptions and mortality and morbidity assumptions. Our analysis of reserve discount rate assumptions considered the significant decline in long-term interest rates which occurred late in 2011. We also considered an updated industry study for long-term care experience which was made available mid-year 2011 from the Society of Actuaries. Our analysis of this study, which was completed during the fourth quarter of 2011, showed that lower termination rates than we had previously assumed were beginning to emerge in industry and in our own company experience. Based on our analysis, as of December 31, 2011 we lowered the discount rate assumption to reflect the low interest rate environment and our expectation of future investment portfolio yield rates. We also changed our mortality assumptions to reflect emerging experience due to an increase in life expectancies which increases the ultimate number of people who will utilize long-term care benefits and also lengthens the amount of time a claimant receives long-term care benefits.  We changed our morbidity assumptions to reflect emerging industry experience as well as our own company experience. While our morbidity experience is still emerging and is not fully credible, we modified our assumptions to align more closely with the recently published industry study. Using our revised best estimate assumptions, as of December 31, 2011 we determined that deferred acquisition costs of $196.0 million were not recoverable and that our policy and claim reserves should be increased by $573.6 million to reflect our current estimate of future benefit obligations. These charges decreased our net income $500.3 million.

2011 Claim Reserve Increase for Individual Disability Closed Block Business

Claim reserves supporting our individual disability closed block of business are calculated using assumptions based on actual experience believed to be currently appropriate. Claim reserves are subject to revision as current claim experience emerges and alters our view of future expectations. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and environmental changes and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business. We are now able, with a higher degree of confidence, to assess our own experience for older ages in our long duration lifetime claim block as our data has become credible. There is very little industry experience for lifetime disability benefits, as our insurance companies were the primary disability companies in the insurance industry at the time lifetime disability benefits were offered. These benefits were offered during the 1980s and 1990s, recent enough such that claimants are just reaching the older ages and providing us with data to build our claim experience base. Emerging experience indicates a longer life expectancy for our older age, longer duration disabled claimants, which lengthens the time a claimant receives disability benefits. As a result of this experience, as of December 31, 2011 we adjusted our mortality assumption within our claim resolution rate assumption and, as a result, increased our claim reserves for our individual disability closed block of business by $183.5 million and decreased net income $119.3 million.

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Outlook for 2014

We believe our disciplined approach to providing financial protection products at the workplace puts us in a position of strength as we seek to capitalize on the growing and largely unfilled need for our products and services. While we anticipate the environment for 2014 will be somewhat similar to modestly improving from 2013, with below-average economic growth, relatively low interest rates, and continued political uncertainty, we have strategies in place which we believe will help us navigate this environment.

We believe the need for our products and services remains strong, and we intend to continue protecting our solid margins and returns through our pricing and risk actions. During 2014, we will continue to invest in our infrastructure and our employees, with a focus on quality and simplification of processes and product offerings. Our strategy will be centered on maintaining a strong customer focus while providing an innovative product portfolio of financial protection choices to deepen employee coverages, broaden employer relationships, and open new markets. We believe that consistent operating results, combined with the implementation of strategic initiatives and the effective deployment of capital, should allow us to meet our long-term financial objectives.

Critical Accounting Estimates

We prepare our financial statements in accordance with GAAP. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in our financial statements and accompanying notes. Estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in our financial statements. The accounting estimates deemed to be most critical to our financial position and results of operations are those related to reserves for policy and contract benefits, deferred acquisition costs, valuation of investments, pension and postretirement benefit plans, income taxes, and contingent liabilities. For additional information, refer to our significant accounting policies in Note 1 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Reserves for Policy and Contract Benefits

Reserves for policy and contract benefits are our largest liabilities and represent claims that we estimate we will eventually pay to our policyholders. The two primary categories of reserves are policy reserves for claims not yet incurred and claim reserves for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Reserves for policy and contract benefits equaled $40.5 billion and $39.9 billion at December 31, 2013 and 2012, respectively, or approximately 79.8 percent and 74.4 percent of our total liabilities, respectively. Reserves ceded to reinsurers were $6.8 billion and $6.7 billion at December 31, 2013 and 2012, respectively, and are reported as a reinsurance recoverable in our consolidated balance sheets.

Policy Reserves

Policy reserves are established in the same period we issue a policy and equal the difference between projected future policy benefits and future premiums, allowing a margin for expenses and profit. These reserves relate primarily to our traditional non interest-sensitive products, including our individual disability and voluntary benefits products in our Unum US segment; individual disability products in our Unum UK segment; disability and cancer and critical illness policies in our Colonial Life segment; and individual disability, long-term care, and other products in our Closed Block segment. The reserves are calculated based on assumptions that were appropriate at the date the policy was issued and are not subsequently modified unless the policy reserves become inadequate (i.e. loss recognition occurs).

• Persistency assumptions are based on our actual historical experience adjusted for future expectations.

• Claim incidence and claim resolution rate assumptions related to mortality and morbidity are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations.

• Discount rate assumptions are based on our current and expected net investment returns.

In establishing policy reserves, we use assumptions that reflect our best estimate while considering the potential for adverse variances in actual future experience, which results in a total policy reserve balance that has an embedded reserve for adverse deviation. We do not, however, establish an explicit and separate reserve as a provision for adverse deviation from our assumptions.

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We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency. Thereafter, the policy reserves for the product line are calculated using the same method we used for the loss recognition testing, referred to as the gross premium valuation method, wherein we use our best estimate as of the gross premium valuation (loss recognition) date rather than the initial policy issue date to determine the expected future claims, commissions, and expenses we will pay and the expected future gross premiums we will receive.

Because the key policy reserve assumptions for policy persistency, mortality and morbidity, and discount rates are all locked in at policy issuance based on assumptions appropriate at that time, policy reserve assumptions are generally not changed due to a change in claim status from active to disabled subsequent to policy issuance.  Therefore, we maintain policy reserves for a policy for as long as the policy remains in-force, even after a separate claim reserve is established. Incidence rates in industry standard valuation tables for policy reserves have traditionally included all lives, active and disabled.  In addition, the waiver of premium provision provides funding for the policy reserve while a policyholder is disabled.  As a result, the funding mechanisms and the cost of claims are aligned and require a policy reserve to be held while on claim.  In addition, most policies allow for multiple occurrences of claims, and a policy reserve is consequently still maintained at the time of claim to fund any potential future claims. The policy reserves build up and release over time based on assumptions made at the time of policy issuance such that the reserve is eliminated as policyholders reach the terminal age for coverage, die, or voluntarily lapse the policy. Policy reserves for Unum US, Unum UK, and Colonial Life products, which at December 31, 2013 represented approximately 12.1 percent, 0.1 percent, and 9.9 percent, respectively, of our total gross policy reserves, are determined using the net level premium method as prescribed by GAAP. In applying this method, we use, as applicable by product type, morbidity and mortality incidence rate assumptions, claim resolution rate assumptions, and policy persistency assumptions, among others, to determine our expected future claim payments and expected future premium income. We then apply an interest, or discount, rate to determine the present value of the expected future claims and claim expenses we will pay and the expected future premiums we will receive, with a provision for profit allowed.

Policy reserves for our Closed Block segment include certain older policy forms for individual disability, individual and group long-term care, and certain other products, all of which are no longer actively marketed. The reserves for individual disability and individual and group long-term care, which represented approximately 41.7 percent of our total gross policy reserves at December 31, 2013, are determined using the gross premium valuation method. Reserves for individual disability are based on assumptions established as of January 1, 2004, the date of loss recognition. Reserves for long-term care are based on assumptions established as of December 31, 2011, the date of loss recognition. Key assumptions are persistency, mortality, claim incidence, claim resolution rates, commission rates, and maintenance expense rates. We apply an interest, or discount, rate to determine the present value of the expected future claims, commissions, and expenses we will pay as well as the expected future premiums we will receive, with no provision for future profit. The interest rate is based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Under the gross premium valuation method, we do not include an embedded provision for the risk of adverse deviation from these assumptions. Gross premium valuation assumptions do not change after the date of loss recognition unless reserves are again determined to be deficient. We perform loss recognition tests on the policy reserves for this block of business annually, or more frequently if appropriate.

Policy reserves for certain other products, excluding individual disability and individual and group long-term care, which are no longer actively marketed and are reported in our Closed Block segment represent $5.8 billion on a gross basis, or approximately 36.2 percent of our total policy reserves. We have ceded $4.6 billion of these other products' policy reserves to reinsurers. The ceded reserve balance is reported in our consolidated balance sheets as a reinsurance recoverable. We continue to service a block of group pension products, which we have not ceded, and the policy reserves for these products are based on expected mortality rates and retirement rates. Expected future payments are discounted at interest rates reflecting the anticipated investment returns for the assets supporting the liabilities.

Claim Reserves

Claim reserves are established when a claim is incurred or is estimated to have been incurred but not yet reported (IBNR) to us and, as prescribed by GAAP, equals our long-term best estimate of the present value of the liability for future claim payments and claim adjustment expenses. A claim reserve is based on actual known facts regarding the claim, such as the benefits available under the applicable policy, the covered benefit period, and the age and occupation of the claimant, as well as assumptions derived from our actual historical experience and expected future changes in experience for factors such as the claim duration and discount rate. Reserves for IBNR claims, similar to incurred claim reserves, include our assumptions for

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claim duration and discount rates but because we do not yet know the facts regarding the specific claims, are also based on historical incidence rate assumptions, including claim reporting patterns, the average cost of claims, and the expected volumes of incurred claims. Our incurred claim reserves and IBNR claim reserves do not include any provision for the risk of adverse deviation from our assumptions.

Claim reserves, unlike policy reserves, are subject to revision as current claim experience and projections of future factors affecting claim experience change. Each quarter we review our emerging experience to ensure that our claim reserves are appropriate. If we believe, based on our actual experience and our view of future events, that our long-term assumptions need to be modified, we adjust our reserves accordingly with a charge or credit to our current period income.

Multiple estimation methods exist to establish claim reserve liabilities, with each method having its own advantages and disadvantages. Available reserving methods utilized to calculate claim reserves include the tabular reserve method, the paid development method, the incurred loss development method, the count and severity method, and the expected claim cost method. No single method is better than the others in all situations and for all product lines. The estimation methods we have chosen are those that we believe produce the most reliable reserves.

Claim reserves supporting our Unum US group and individual disability product lines and our Closed Block individual disability and individual and group long-term care product lines represent approximately 35.3 percent and 47.2 percent, respectively, of our total claim reserves at December 31, 2013. We use a tabular reserve methodology for group and individual long-term disability and group and individual long-term care claims that have been reported. Under the tabular reserve methodology, reserves for reported claims are based on certain characteristics of the actual reported claimants, such as age, length of time disabled, and medical diagnosis. We believe the tabular reserve method is the most accurate to calculate long-term liabilities and allows us to use the most available known facts about each claim. IBNR claim reserves for our long-term products are calculated using the count and severity method using historical patterns of the claims to be reported and the associated claim costs. For Unum US group short-term disability products, an estimate of the value of future payments to be made on claims already submitted, as well as IBNR claims, is determined in aggregate rather than on the individual claimant basis that we use for our long-term products, using historical patterns of claim incidence as well as historical patterns of aggregate claim resolution rates. The average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products than for our long-term liabilities and results in less estimation variability.

Claim reserves supporting the Unum US group life and accidental death and dismemberment products represent approximately 3.7 percent of our total claim reserves at December 31, 2013. Claim reserves for these products are related primarily to death claims reported but not yet paid, IBNR death claims, and a liability for waiver of premium benefits. The death claim reserve is based on the actual face amount to be paid, the IBNR reserve is calculated using the count and severity method, and the waiver of premium benefits reserve is calculated using the tabular reserve methodology.

Claim reserves supporting our Unum UK segment represent approximately 10.0 percent of our total claim reserves at December 31, 2013, and are calculated using generally the same methodology that we use for Unum US disability and group life reserves. The assumptions used in calculating claim reserves for this line of business are based on standard United Kingdom industry experience, adjusted for Unum UK's own experience.

The majority of the Colonial Life segment lines of business have short-term benefits, which generally have less estimation variability than our long-term products because of the shorter claim payout period. Our claim reserves for Colonial Life's lines of business, which approximate 1.7 percent of our total claim reserves at December 31, 2013, are predominantly determined using the incurred loss development method based on our own experience. The incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date. Where the incurred loss development method may not be appropriate, we estimate the incurred claims using an expected claim cost per policy or other measure of exposure. The key assumptions for claim reserves for the Colonial Life lines of business are: (1) the timing, rate, and amount of estimated future claim payments; and (2) the estimated expenses associated with the payment of claims.

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The following table displays policy reserves, incurred claim reserves, and IBNR claim reserves by major product line, with the summation of the policy reserves and claim reserves shown both gross and net of the associated reinsurance recoverable. Incurred claim reserves represent reserves determined for each incurred claim and also include estimated amounts for litigation expenses and other expenses associated with the payment of the claims as well as provisions for claims which we estimate will be reopened for our long-term care products. IBNR claim reserves include provisions for incurred but not reported claims and a provision for reopened claims for our disability products. The IBNR and reopened claim reserves for our disability products are developed and maintained in aggregate based on historical monitoring that has only been on a combined basis. Impacting year over year comparability of claim reserves in the following chart are the 2013 reserve adjustments for unclaimed death benefits and group life waiver of premium benefits. See "Executive Summary" contained in this Item 7 and Note 6 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of these reserve adjustments.

(in millions of dollars)	December 31, 2013
	Gross												Total
	Policy				Claim Reserves								Reinsurance		Total
	Reserves		%		Incurred		IBNR		%		Total		Ceded		Net
Group Disability	$	—	—	%	$	6,810.3	$	569.1	30.1	%	$	7,379.4	$	66.6	$	7,312.8
Group Life and Accidental Death & Dismemberment	72.3		0.5		713.2		201.1		3.7		986.6		2.5		984.1
Individual Disability - Recently Issued	558.3		3.5		1,155.7		124.4		5.2		1,838.4		104.3		1,734.1
Voluntary Benefits	1,298.4		8.1		48.9		73.2		0.5		1,420.5		29.2		1,391.3
Unum US Segment	1,929.0		12.1		8,728.1		967.8		39.5		11,624.9		202.6		11,422.3
Unum UK Segment	24.9		0.1		2,286.0		171.7		10.0		2,482.6		130.1		2,352.5
Colonial Life Segment	1,577.6		9.9		274.1		134.1		1.7		1,985.8		13.9		1,971.9
Individual Disability	859.3		5.4		10,346.8		281.9		43.3		11,488.0		1,545.0		9,943.0
Long-term Care	5,791.4		36.3		865.7		94.8		3.9		6,751.9		42.6		6,709.3
Other	5,783.8		36.2		234.4		150.2		1.6		6,168.4		4,915.2		1,253.2
Closed Block Segment	12,434.5		77.9		11,446.9		526.9		48.8		24,408.3		6,502.8		17,905.5
Subtotal	$	15,966.0	100.0	%	$	22,735.1	$	1,800.5	100.0	%	40,501.6		6,849.4		33,652.2
Adjustment to Reserves for Unrealized Gain on Securities											4,108.5		263.8		3,844.7
Consolidated											$	44,610.1	$	7,113.2	$	37,496.9

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	December 31, 2012
	Gross												Total
	Policy				Claim Reserves								Reinsurance		Total
	Reserves		%		Incurred		IBNR		%		Total		Ceded		Net
Group Disability	$	—	—	%	$	7,000.8	$	596.0	30.9	%	$	7,596.8	$	61.3	$	7,535.5
Group Life and Accidental Death & Dismemberment	73.8		0.5		790.1		168.1		3.9		1,032.0		1.0		1,031.0
Individual Disability - Recently Issued	557.8		3.6		1,093.2		126.0		5.0		1,777.0		91.2		1,685.8
Voluntary Benefits	1,224.3		8.0		42.4		49.4		0.4		1,316.1		28.6		1,287.5
Unum US Segment	1,855.9		12.1		8,926.5		939.5		40.2		11,721.9		182.1		11,539.8
Unum UK Segment	25.6		0.2		2,251.7		142.2		9.7		2,419.5		108.3		2,311.2
Colonial Life Segment	1,490.3		9.7		251.4		99.4		1.4		1,841.1		9.4		1,831.7
Individual Disability	985.7		6.4		10,406.2		297.3		43.6		11,689.2		1,492.7		10,196.5
Long-term Care	5,272.5		34.4		747.0		81.3		3.4		6,100.8		47.0		6,053.8
Other	5,704.5		37.2		258.8		165.7		1.7		6,129.0		4,829.9		1,299.1
Closed Block Segment	11,962.7		78.0		11,412.0		544.3		48.7		23,919.0		6,369.6		17,549.4
Subtotal	$	15,334.5	100.0	%	$	22,841.6	$	1,725.4	100.0	%	39,901.5		6,669.4		33,232.1
Adjustment to Reserves for Unrealized Gain on Securities											6,277.5		351.5		5,926.0
Consolidated											$	46,179.0	$	7,020.9	$	39,158.1

Key Assumptions

The calculation of policy and claim reserves involves numerous assumptions, but the primary assumptions used to calculate reserves are (1) the discount rate, (2) the claim resolution rate, and (3) the claim incidence rate for policy reserves and IBNR claim reserves. Of these assumptions, our discount rate and claim resolution rate assumptions have historically had the most significant effects on our level of reserves because many of our product lines provide benefit payments over an extended period of time.

1. The discount rate, which is used in calculating both policy reserves and incurred and IBNR claim reserves, is the interest rate that we use to discount future claim payments to determine the present value. A higher discount rate produces a lower reserve. If the discount rate is higher than our future investment returns, our invested assets will not earn enough investment income to support our future claim payments. In this case, the reserves may eventually be insufficient. We set our assumptions based on our current and expected future investment yield of the assets supporting the reserves, considering current and expected future market conditions. If the investment yield on new investments that are purchased is below or above the investment yield of the existing investment portfolio, it is likely that the discount rate assumption on claims will be established to reflect the effect of the new investment yield.

2. The claim resolution rate, used for both policy reserves and incurred and IBNR claim reserves, is the probability that a disability or long-term care claim will close due to recovery or death of the insured. It is important because it is used to estimate how long benefits will be paid for a claim. Estimated resolution rates that are set too high will result in reserves that are lower than they need to be to pay the claim benefits over time. Claim resolution assumptions involve many factors, including the cause of disability, the policyholder's age, the type of contractual benefits provided, and the time since initially becoming disabled. We primarily use our own claim experience to develop our claim resolution assumptions. These assumptions are established for the probability of death and the probability of recovery from disability. Our studies review actual claim resolution experience over a number of years, with more weight placed on our experience in the more recent years. We also consider any expected future changes in claim resolution experience.

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3. The incidence rate, used for policy reserves and IBNR claim reserves, is the rate at which new claims are submitted to us. The incidence rate is affected by many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and certain external factors such as consumer confidence and levels of unemployment. We establish our incidence assumption using a historical review of actual incidence results along with an outlook of future incidence expectations.

Establishing reserve assumptions is complex and involves many factors. Reserves, particularly for policies offering insurance coverage for long-term disabilities and long-term care, are dependent on numerous assumptions other than just those presented in the preceding discussion. The impact of internal and external events, such as changes in claims operational procedures, economic trends such as the rate of unemployment and the level of consumer confidence, the emergence of new diseases, new trends and developments in medical treatments, and legal trends and legislative changes, among other factors, will influence claim incidence and resolution rates. In addition, for policies offering coverage for disability or long-term care at advanced ages, the level and pattern of mortality rates at advanced ages will impact overall benefit costs. Reserve assumptions differ by product line and by policy type within a product line. Additionally, in any period and over time, our actual experience may have a positive or negative variance from our long-term assumptions, either singularly or collectively, and these variances may offset each other. We test the overall adequacy of our reserves using all assumptions and with a long-term view of our expected experience over the life of a block of business rather than test just one or a few assumptions independently that may be aberrant over a short period of time. Therefore, it is not possible to bifurcate the assumptions to evaluate the sensitivity of a change in each assumption, but rather in the aggregate by product line. The following section presents an overview of our trend analysis for key assumptions and the results of variability in our assumptions, in aggregate, for the reserves which we believe are reasonably possible to have a material impact on our future financial results if actual claims yield a materially different amount than what we currently expect and have reserved for, either favorable or unfavorable.

Trends in Key Assumptions

Generally, we do not expect our mortality and morbidity claim incidence trends or our persistency trends to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time. We have historically experienced an increase in our group long-term disability morbidity claim incidence trends during and following a recessionary period, particularly in our Unum US operations.  During 2012 and 2011, claim incidence rates for Unum US group long-term disability were slightly elevated relative to the level of 2010, but in 2013 incidence rates improved slightly, returning to the level of 2010. We expect that claim incidence trends for Unum US group long-term disability may continue to somewhat follow general economic conditions and demographics of the general U.S. workforce.

During 2013 and 2012, claims incidence was elevated for our Closed Block long-term care line of business as compared to the long-term assumptions we established at the time of loss recognition in 2011. We view the elevated incidence as temporary in nature. See "2011 Long-term Care Strategic Review" contained in this Item 7.

Throughout the period 2011 to 2013, actual new money interest rates varied with the changing market conditions, and the assumptions we used to discount our reserves during this period generally trended downward slightly for all segments and product lines. In 2011, long-term interest rates declined significantly due to the European Union debt crisis and the Federal Reserve Board's actions. Interest rates improved somewhat in 2013 but continue to remain low relative to historical norms. Reserve discount rate assumptions for new policies and new claims have been adjusted to reflect our current and expected net investment returns. Changes in our average discount rate assumptions tend to occur gradually over a longer period of time because of the long-duration investment portfolio needed to support the reserves for the majority of our lines of business.

During 2013, we updated our mortality and interest rate assumptions for our Closed Block group pension line of business to reflect recent trends. The updated assumptions resulted in an immaterial increase to our group pension reserves. The retirement rate experience has remained stable and consistent with expectations.

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Claim resolution rates have a greater chance of significant variability in a shorter period of time than our other reserve assumptions. These rates are reviewed on a quarterly basis for the death and recovery components separately. Claim resolution rates in our Unum US group and individual long-term disability product lines and our Closed Block individual disability product line have over the last several years exhibited some variability. Relative to the resolution rate we expect to experience over the life of the block of business, actual quarterly rates during 2012 and 2013 have varied by +3 and -3 percent in our Unum US group long-term disability line of business, between +8 and -10 percent in our Unum US individual disability - recently issued line of business, and between +4 and -4 percent in our Closed Block individual disability line of business. Claim resolution rates are very sensitive to operational and environmental changes and can be volatile over short periods of time. Throughout the period 2011 to 2013, our claim resolution rates were fairly consistent with or slightly favorable to our long-term assumptions. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period, both favorably and unfavorably.

Regarding experience for our older age, longer duration disabled claimants in our Closed Block individual disability line of business, the claim resolution rates, primarily as pertaining to life expectancy of the insured, remained relatively consistent during 2013 and 2012 with the mortality assumptions for this particular claim block that we updated in 2011. See "2011 Claim Reserve Increase for Individual Disability Closed Block Business" contained in this Item 7.

We monitor and test our reserves for adequacy relative to all of our assumptions in the aggregate. In our estimation, scenarios based on reasonably possible variations in each of our reserve assumptions, when modeled together in aggregate, could produce a potential result, either positive or negative, in our Unum US group disability line of business that would change our claim reserve balance by +/- 3.3 percent. Using our actual claim reserve balance at December 31, 2013, this variation would have resulted in an approximate change (either positive or negative) of $240 million to our claim reserves. Using the same sensitivity analysis approach for our Closed Block individual disability line of business, the claim reserve balance could potentially vary by +/- 2.3 percent of our reported balance, which at December 31, 2013, would have resulted in an approximate change (either positive or negative) of $230 million to our claim reserves. The major contributor to the variance for both the Unum US group long-term disability line of business and the Closed Block individual disability line of business is the claim resolution rate.

In addition, we consider variability in our reserve assumptions related to long-term care policy reserves.  These reserves are held under the gross premium valuation method with assumptions established as of December 31, 2011, the date of loss recognition. Assumptions for policy reserves do not change after the date of loss recognition unless reserves are again determined to be deficient. As such, positive developments will result in the accumulation of reserve margin, while adverse developments would result in an additional reserve charge.  Policy reserves for long-term care are based upon a number of key assumptions, and each assumption has various factors which may impact the long-term outcome. Key assumptions with respect to morbidity, mortality, persistency, interest rates, and future premium rate increases must incorporate extended views of expectations for many years into the future. Reserves are highly sensitive to these estimates. For example, a 25 basis point change in the assumed discount rate over the lifetime of this business would impact reserves by approximately $400 million, with all other factors held constant. Key assumptions and related impacts are also heavily interrelated in both their outcome and in their effects on reserves. For example, changes in the view of morbidity and mortality might be mitigated by either potential future premium rate increases and/or morbidity improvements due to general improvement in health and/or medical breakthroughs. There is potentially a wide range of outcomes for each assumption and in totality.

We believe that these ranges provide a reasonable estimate of the possible changes in reserve balances for those product lines where we believe it is possible that variability in the assumptions, in the aggregate, could result in a material impact on our reserve levels, but we record our reserves based on our long-term best estimate. Because these product lines have long-term claim payout periods, there is a greater potential for significant variability in claim costs, either positive or negative. We closely monitor emerging experience and use these results to inform our view of long-term assumptions.

Deferred Acquisition Costs (DAC)

We defer incremental direct costs associated with the successful acquisition of new or renewal insurance contracts and amortize (expense) these costs over the life of the related policies. Deferred costs include certain commissions, other agency compensation, selection and policy issue expenses, and field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral.

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Approximately 83 percent of our DAC relates to traditional non interest-sensitive products, and we amortize DAC for these products in proportion to the premium income we expect to receive over the life of the policies. DAC related to interest-sensitive policies is amortized over the lives of the policies in relation to the present value of estimated gross profits from surrender charges, mortality margins, investment returns, and expense margins. Key assumptions used in developing the future amortization of DAC are persistency, premium income, and for our interest-sensitive products, mortality margins and investment returns.  We use our own historical experience and expectation of the future performance of our businesses in determining our assumptions.  For traditional products, the estimated premium income in the early years of the amortization period is generally higher than in the later years due to the anticipated cumulative effect of policy persistency in the early years, which results in a greater proportion of the costs being amortized in the early years of the life of the policy.  During 2013, our key assumptions used to develop the future amortization of acquisition costs deferred during 2013 did not change materially from those used in 2012.  Generally, we do not expect our key assumptions to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time.

The following are our current assumptions regarding the length of our amortization periods, the approximate DAC balance that remains at the end of years 3, 10, and 15 as a percentage of the cost initially deferred, and our DAC balances as of December 31, 2013 and 2012.

		Balance Remaining as a %			DAC Balances
	Amortization	of Initial Deferral			at December 31
	Period	Year 3	Year 10	Year 15	2013		2012
Unum US					(in millions of dollars)
Group Disability	6	25%	0%	0%	$	55.9	$	47.4
Group Life and Accidental Death & Dismemberment	6	30%	0%	0%	49.9		40.7
Supplemental and Voluntary:
Individual Disability - Recently Issued	20	75%	50%	25%	433.4		449.1
Voluntary Benefits	15	60%	15%	0%	512.3		487.1
Unum UK
Group Disability	3	7%	0%	0%	5.1		4.1
Group Life	3	7%	0%	0%	1.2		3.2
Supplemental	20	57%	17%	7%	28.0		31.5
Colonial Life
Accident, Sickness, and Disability	15	46%	12%	2%	350.6		328.9
Life	25	71%	35%	17%	218.7		195.4
Cancer and Critical Illness	19	60%	27%	11%	174.1		168.1
Totals					$	1,829.2	$	1,755.5

Amortization of DAC is adjusted to reflect actual experience for assumptions which deviate compared to the anticipated experience. Any deviations from projections may result in a change to the rate of amortization in the period such events occur. As an example, for our traditional products, we may experience accelerated amortization if policies terminate earlier than projected, or we may experience a slower rate of amortization if policies persist longer than projected. Our actual experience has not varied materially from our assumptions during the last three years.

See Note 1 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of our DAC accounting policy.

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Fair Value of Investments

All of our fixed maturity securities are classified as available-for-sale and are reported at fair value. Our derivative financial instruments, including certain derivative instruments embedded in other contracts, are reported as either assets or liabilities and measured at fair value. We hold an immaterial amount of equity securities, which are also reported at fair value.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and therefore represents an exit price, not an entry price. The exit price objective applies regardless of our intent and/or ability to sell the asset or transfer the liability at the measurement date. We generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets or liabilities and the income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. We believe the market approach valuation technique provides more observable data than the income approach, considering the types of investments we hold.

The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. The market sources from which we obtain or derive the fair values of our assets and liabilities carried at market value include quoted market prices for actual trades, price quotes from third party pricing vendors, price quotes we obtain from outside brokers, matrix pricing, discounted cash flow, and observable prices for similar publicly traded or privately traded issues that incorporate the credit quality and industry sector of the issuer. Our fair value measurements could differ significantly based on the valuation technique and available inputs.

Inputs to valuation techniques refer broadly to the assumptions that market participants use in pricing assets or liabilities, including assumptions about risk, for example, the risk inherent in a particular valuation technique used to measure fair value and/or the risk inherent in the inputs to the valuation technique. We use observable and unobservable inputs in measuring the fair value of our financial instruments. Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources. Unobservable inputs are inputs that reflect our own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations combining matrix pricing with vendor purchased software programs, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

As of December 31, 2013, the key assumptions we generally used to estimate the fair value of these types of securities included those listed below. Where appropriate, we have noted the assumption used for the prior period as well as the reason for the change.

• Risk free interest rates of 1.74 percent for five-year maturities to 3.97 percent for 30-year maturities were derived from the current yield curve for U.S. Treasury Bonds with similar maturities. This compares to interest rates of 0.72 percent for five-year maturities to 2.95 percent for 30-year maturities used at December 31, 2012.

• Current Baa corporate bond spread adjustments ranging from 1.01 percent to 2.10 percent were added to the risk free rate to reflect additional credit risk and the lack of liquidity. We used spread adjustments ranging from 0.98 percent to 2.23 percent at December 31, 2012. The changes were based on observable market spreads. Newly issued private placement securities have historically offered yield premiums higher than a similar interest rate spread on comparable newly issued public securities.

• Additional basis points were added as deemed appropriate for foreign investments, certain industries, and individual securities in certain industries that are considered to be of greater risk.

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As of December 31, 2013, approximately 6.0 percent of our fixed maturity securities were categorized as Level 1, 88.5 percent as Level 2, and 5.5 percent as Level 3. Level 1 is the highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities. The Level 2 category includes assets or liabilities valued using inputs (other than those included in the Level 1 category) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life. The Level 3 category is the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date using unobservable inputs to extrapolate an estimated fair value.

Rapidly changing credit and equity market conditions can materially impact the valuation of securities, and the period to period changes in value can vary significantly.

See Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Investment Impairments

One of the significant estimates related to investments is our impairment valuation. In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate the following factors:

• Whether we expect to recover the entire amortized cost basis of the security

• Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis

• Whether the security is current as to principal and interest payments

• The significance of the decline in value

• The time period during which there has been a significant decline in value

• Current and future business prospects and trends of earnings

• The valuation of the security’s underlying collateral

• Relevant industry conditions and trends relative to their historical cycles

• Market conditions

• Rating agency and governmental actions

• Bid and offering prices and the level of trading activity

• Adverse changes in estimated cash flows for securitized investments

• Changes in fair value subsequent to the balance sheet date

• Any other key measures for the related security.

We evaluate available information, including the factors noted above, both positive and negative, in reaching our conclusions. In particular, we also consider the strength of the issuer’s balance sheet, its debt obligations and near term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although all available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

While determining other-than-temporary impairments is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of problem investments and the recording of losses on a timely basis for investments determined to have an other-than-temporary impairment.

We use a comprehensive rating system to evaluate the investment and credit risk of our mortgage loans and to identify specific properties for inspection and reevaluation. Mortgage loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. We establish an allowance for probable losses on mortgage loans based on a review of individual loans, considering the value of the underlying collateral, the value of which is periodically assessed. Mortgage loans are not reported at fair value in our consolidated balance sheets unless the mortgage loan is considered impaired, in which case the impairment is recognized as a realized investment loss in our consolidated statements of income.

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There are a number of significant risks inherent in the process of monitoring our investments for impairments and determining when and if an impairment is other than temporary. These risks and uncertainties include the following possibilities:

• The assessment of a borrower's ability to meet its contractual obligations will change.

• The economic outlook, either domestic or foreign, may be less favorable or may have a more significant impact on the borrower than anticipated, and as such, the investment may not recover in value.

• New information may become available concerning the security, such as disclosure of accounting irregularities, fraud, or corporate governance issues.

• Significant changes in credit spreads may occur in the related industry.

• Significant increases in interest rates may occur and may not return to levels similar to when securities were initially purchased.

• Adverse rating agency actions may occur.

See Notes 1 and 3 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Pension and Postretirement Benefit Plans

We sponsor several defined benefit pension and other postretirement benefit (OPEB) plans for our employees, including non-qualified pension plans. The U.S. defined benefit pension plans comprise the majority of our total benefit obligation and pension expense. Our U.K. operation maintains a separate defined benefit plan for eligible employees. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, and the U.K. defined benefit pension plan was closed to new entrants on December 31, 2002. In 2013, we adopted plan amendments which freeze participation and benefit accruals in our U.S. qualified and non-qualified defined benefit pension plans, effective December 31, 2013. Also in 2013, we adopted amendments to our U.K. pension plan which freeze participation in the plan effective June 30, 2014 and which reduce the maximum rate of inflation indexation from 5.0 percent to 2.5 percent for pension benefits which were earned prior to April 1997 effective at the date of adoption.

Assumptions

Our net periodic benefit costs and the value of our benefit obligations for these plans are determined based on a set of economic and demographic assumptions that represent our best estimate of future expected experience. Major assumptions used in accounting for these plans include the expected discount (interest) rate and the long-term rate of return on plan assets. We also use, as applicable, expected increases in compensation levels and a weighted average annual rate of increase in the per capita cost of covered benefits, which reflects a health care cost trend rate, and the U.K. pension plan also uses expected cost of living increases to plan benefits.

The assumptions chosen for our pension and OPEB plans are reviewed annually, using a December 31 measurement date for each of our plans unless we are required to perform an interim remeasurement as occurred in 2013 due to our pension plans amendments. The discount rate assumptions and expected long-term rate of return assumptions have the most significant effect on our net periodic benefit costs associated with these plans. In addition to the effect of changes in our assumptions, the net periodic cost or benefit obligation under our pension and OPEB plans may change due to factors such as plan amendments, actual experience being different from our assumptions, special benefits to terminated employees, and/or changes in benefits provided under the plans.

The discount rate is an interest assumption used to convert the benefit payment stream to a present value. We set the discount rate assumption at the measurement date for each of our retirement-related benefit plans to reflect the yield on a portfolio of high quality fixed income corporate debt instruments that reasonably match the timing and amounts of projected future benefits. A lower discount rate increases the present value of benefit obligations and increases our costs.

The discount rate we used to determine our net periodic benefit costs for our U.S. pension plans for 2014 was 5.30 percent and for 2013 was 4.50 percent for the period January 1, 2013 through the date of remeasurement and 5.00 percent for the period from the date of remeasurement through December 31, 2013. The discount rate used for the net periodic benefit costs for our U.K. pension plan for 2014 was 4.40 percent and for 2013 was 4.50 percent for the period January 1, 2013 through the date of remeasurement and 4.60 percent from the date of remeasurement through December 31, 2013. The discount rate used in the net periodic benefit cost for our OPEB plan for 2014 and 2013 was 5.00 percent and 4.20 percent, respectively.

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Regarding sensitivity analysis, reducing the discount rate assumptions by 50 basis points would have increased our 2013 pension and OPEB expenses by approximately $16.4 million, before tax, and would have increased our pension and OPEB benefit obligations by approximately $174.4 million as of December 31, 2013, resulting in an after-tax decrease in stockholders' equity of approximately $116.5 million as of December 31, 2013.

An increase in the discount rate assumptions of 50 basis points would have decreased our 2013 pension and OPEB expenses by approximately $13.9 million, before tax, and would have decreased our pension and OPEB benefit obligations by approximately $156.4 million as of December 31, 2013, resulting in an after-tax increase in stockholders' equity of approximately $104.6 million as of December 31, 2013.

The long-term rate of return assumption is the best estimate of the average annual assumed return that will be produced from the pension trust assets until current benefits are paid. The U.S. pension plans use a compound interest method in computing the rate of return on their pension plan assets. The investment portfolio for our U.S. qualified pension plan contains a diversified blend of domestic and international large cap, mid cap, and small cap equity securities; U.S. government and agency, corporate, and state and municipal fixed income securities; private equity direct investments, private equity funds of funds, hedge funds of funds, and cash equivalents. Assets for our U.K. pension plan are invested in pooled funds, including diversified growth funds, which invest in assets such as global equities, hedge funds, commodities, below-investment-grade fixed income securities, and currencies; as well as leveraged, interest rate, and inflation swap funds intended to broadly match part of the interest rate and inflation sensitivities of the plan's liabilities. Assets for our OPEB plan are invested primarily in life insurance contracts. We believe our investment portfolios are well diversified by asset class and sector, with no potential risk concentrations in any one category.

Our expectations for the future investment returns of the asset categories are based on a combination of historical market performance, evaluations of investment forecasts obtained from external consultants and economists, and current market yields. For the U.S. pension plans, the methodology underlying the return assumption included the various elements of the expected return for each asset class such as long-term rates of return, volatility of returns, and the correlation of returns between various asset classes. The expected return for the total portfolio is calculated based on the plan's current asset allocation. Investment risk is measured and monitored on an ongoing basis through annual liability measurements, periodic asset/liability studies, and quarterly investment portfolio reviews.  Risk tolerance is established through consideration of plan liabilities, plan funded status, and corporate financial condition. 

The long-term rate of return on asset assumption used in the net periodic pension costs for our U.S. qualified defined benefit pension plan for 2014 and 2013 was 7.50 percent for both years. The long-term rate of return on asset assumption used for our U.K. pension plan for 2014 was 6.10 percent and for 2013 was 6.20 percent for the period from January 1, 2013 to the date of remeasurement and 6.35 percent from the date of remeasurement through December 31, 2013. The long-term rate of return on asset assumption used for our OPEB plan was 5.75 percent for both years. The actual rate of return on plan assets is determined based on the fair value of the plan assets at the beginning and the end of the period, adjusted for contributions and benefit payments.

A change in the long-term rate of return on asset assumptions on the pension plan assets of +/-50 basis points would have changed our 2013 pension plan expense by approximately $7.9 million before tax, but would not materially changed our OPEB plan expense. A lower rate of return on plan assets increases our expense.

Benefit Obligation and Fair Value of Plan Assets

The market-related value equals the fair value of assets, determined as of the measurement date. The return on assets fully recognizes all asset gains and losses, including changes in fair value, through the measurement date.

During 2013, the fair value of plan assets in our U.S. qualified defined benefit pension plan increased $237.1 million, or approximately 17.5 percent, while the fair value of plan assets in our U.K. pension plan increased £9.9 million, or approximately 7.8 percent. Although the effect of these increases in fair value had no impact on our 2013 net periodic pension costs, the favorable rate of return on these plan assets in 2013 and the increase in the liability discount rate for the U.S. plans will have a favorable impact on our net periodic pension costs for 2014. We believe our assumptions appropriately reflect the impact of the current economic environment.

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Our pension and OPEB plans have an aggregate unrecognized net actuarial loss of $368.7 million and a net unrecognized prior service credit of $2.4 million, which together represent the cumulative liability and asset gains and losses as well as the portion of prior service credits that have not been recognized in pension expense. As of December 31, 2013, the unrecognized net loss for these two items combined was $366.3 million.

The unrecognized gains or losses are amortized as a component of the net benefit cost. Our 2013, 2012, and 2011 pension and OPEB expense includes $27.9 million, $43.4 million, and $28.8 million, respectively, of amortization of the unrecognized net actuarial loss and prior service credit (cost). The unrecognized net actuarial loss for our pension plans, which is $379.0 million at December 31, 2013, will be amortized over the average remaining life expectancy of the plan participants, which is approximately 33 years for U.S. participants and 34 years for U.K. participants, to the extent that it exceeds the 10 percent corridor, as described below. The unrecognized net actuarial gain of $10.3 million for our OPEB plan will be amortized over the average future working life of OPEB plan participants, estimated at five years, to the extent the loss is outside of a corridor established in accordance with GAAP. The corridor for the pension and OPEB plans is established based on the greater of 10 percent of the plan assets or 10 percent of the benefit obligation.  At December 31, 2013, $169.1 million of the actuarial loss was outside of the corridor for the U.S. plan, and £8.7 million was outside of the corridor for the U.K. plan. At December 31, 2013, none of the actuarial gain was outside of the corridor for the OPEB plan.

The fair value of plan assets in our U.S. qualified defined benefit pension plan was $1,590.7 million at December 31, 2013, compared to $1,353.6 million at December 31, 2012. The effect of the increase in the liability discount rate and fair value of plan assets, as well as the plan amendment, contributed to the overfunded plan position of $13.4 million at December 31, 2013, compared to an underfunded position of $454.3 million at December 31, 2012.

The fair value of plan assets in our OPEB plan was $11.4 million at December 31, 2013, compared to $11.5 million at December 31, 2012. These assets represent life insurance contracts to fund the life insurance benefit portion of our OPEB plan. Our OPEB plan represents a non-vested, non-guaranteed obligation, and current regulations do not require specific funding levels for these benefits, which are comprised of retiree life, medical, and dental benefits. It is our practice to use general assets to pay medical and dental claims as they come due in lieu of utilizing plan assets for the medical and dental benefit portions of our OPEB plan. We expect to continue to receive subsidies under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, based on current law, to partially offset these payments. The expected subsidy included in our consolidated balance sheets is immaterial. We discontinued offering retiree life insurance to future retirees effective December 31, 2012. We will still provide this benefit to those employees who retired prior to December 31, 2012.

The fair value of plan assets in our U.K. pension plan was £136.4 million at December 31, 2013, compared to £126.5 million at December 31, 2012. The U.K. pension plan was in an overfunded position of £10.3 million and £5.3 million at December 31, 2013 and 2012, respectively.

See Note 9 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion.

Income Taxes

We record a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized.  In 2011, as part of an Internal Revenue Service (IRS) settlement, we released a $4.1 million valuation allowance related to basis differences in foreign subsidiaries and net operating loss carryforwards in foreign jurisdictions for which we previously believed we would not realize a tax benefit. As of December 31, 2013 and 2012, we had no valuation allowance.

In evaluating the ability to recover deferred tax assets, we have considered all available positive and negative evidence including past operating results, the existence of cumulative losses in the most recent years, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies.  In the event we determine that we most likely would not be able to realize all or part of our deferred tax assets in the future, an increase to the valuation allowance would be charged to earnings in the period such determination is made.  Likewise, if it is later determined that it is more likely than not that those deferred tax assets would be realized, the previously provided valuation allowance would be reversed.

The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax laws in a multitude of jurisdictions, both domestic and foreign.  The amount of income taxes we pay is subject to ongoing audits in various jurisdictions, and a material assessment by a governing tax authority could affect profitability. 

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GAAP prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in income tax returns. The evaluation of a tax position is a two step process. The first step is to determine whether it is more likely than not that a tax position will be sustained upon examination based on the technical merits of the position. The second step is to measure a position that satisfies the recognition threshold at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more likely than not threshold but that now satisfy the recognition threshold are recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more likely than not recognition threshold are derecognized in the first subsequent financial reporting period in which that threshold is no longer met. If a previously recognized tax position is settled for an amount that is different from the amount initially measured, the difference will be recognized as a tax benefit or expense in the period the settlement is effective.

See Note 7 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Contingent Liabilities

On a quarterly basis, we review relevant information with respect to litigation and contingencies to be reflected in our consolidated financial statements. An estimated loss is accrued when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period.  See Note 14 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

Accounting Developments

In July 2013, the Financial Accounting Standards Board (FASB) issued a proposed Accounting Standards Update (ASU) on insurance contracts that is intended to bring greater consistency to the accounting for contracts that transfer significant risk between parties and would require a current measure of insurance contracts, including the use of updated assumptions and discounting. The proposed ASU, which would supersede existing guidance on accounting for insurance contracts, calls for retrospective application and would prohibit early adoption. The proposal did not specify an effective date, but instead requested feedback on the appropriate timing.

For additional information on new accounting standards and the impact, if any, on our financial position or results of operations, see Note 1 of the "Notes to Consolidated Financial Statements" contained herein in Item 8.

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Consolidated Operating Results

(in millions of dollars)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Revenue
Premium Income	$	7,624.7		(1.2	)%	$	7,716.1		2.7	%	$	7,514.2
Net Investment Income	2,492.1			(0.9	)	2,515.2			(0.2	)	2,519.6
Net Realized Investment Gain (Loss)	6.8			(87.9	)	56.2			N.M.		(4.9		)
Other Income	230.2			1.0		227.9			(8.5	)	249.1
Total Revenue	10,353.8			(1.5	)	10,515.4			2.3		10,278.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	6,595.7			(1.9	)	6,722.2			(6.8	)	7,209.5
Commissions	909.5			(0.8	)	917.2			4.3		879.2
Interest and Debt Expense	149.4			2.8		145.4			1.5		143.3
Deferral of Acquisition Costs	(466.8		)	(0.1	)	(467.3		)	5.6		(442.5		)
Amortization of Deferred Acquisition Costs	418.9			10.6		378.7			3.6		365.7
Impairment of Deferred Acquisition Costs	—			—		—			—		196.0
Compensation Expense	790.4			0.5		786.8			(2.6	)	808.0
Other Expenses	751.5			(4.0	)	782.9			(0.3	)	785.5
Total Benefits and Expenses	9,148.6			(1.3	)	9,265.9			(6.8	)	9,944.7
Income Before Income Tax	1,205.2			(3.5	)	1,249.5			274.9		333.3
Income Tax	347.1			(2.3	)	355.1			N.M.		49.1
Net Income	$	858.1		(4.1	)	$	894.4		214.7		$	284.2

N.M. = not a meaningful percentage

In describing our results, we may at times note certain items and exclude the impact on financial ratios and metrics to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur. See "Reconciliation of Non-GAAP Financial Measures" as follows for additional discussion of these items.

The comparability of our financial results between years is affected by the fluctuation in the British pound sterling to dollar exchange rate. The functional currency of our U.K. operations is the British pound sterling. In periods when the pound weakens relative to the preceding period, as occurred during 2013 and 2012, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens, translating pounds into dollars increases current period results relative to the prior period. Our weighted average pound/dollar exchange rate was 1.566, 1.584, and 1.603 for years ended 2013, 2012, and 2011, respectively. If the 2012 and 2011 results for our U.K. operations had been translated at the exchange rate of 2013, our operating revenue by segment in 2012 and 2011 would have been lower by approximately $10.8 million and $20.9 million, respectively, and our operating income in 2012 and 2011 would have been lower by approximately $1.4 million and $4.4 million, respectively. However, it is important to distinguish between translating and converting foreign currency. Except for a limited number of transactions, we do not actually convert pounds into dollars. As a result, we view foreign currency translation as a financial reporting item and not a reflection of operations or profitability in the U.K.

Consolidated premium income for 2013 declined slightly relative to 2012. Although we experienced premium growth in our Unum US and Colonial Life segments, the level of growth remains below our long-term expectations. We believe premium growth in many of our product lines has been unfavorably impacted by the weak pace of economic growth, low levels of employment growth, the competitive environment, and the distraction caused by political instability and the implementation of healthcare reform. Offsetting the growth in premium income in Unum US and Colonial Life was a decline in premium income due to the reinsurance agreements we entered into during 2013 to cede a portion of certain product lines in Unum US individual disability - recently issued and in Unum UK. Consolidated premium income for 2012 increased relative to 2011 and included premium growth for each of our three principal operating business segments, although the growth was unfavorably impacted by the same factors pressuring 2013 growth. Premium income year over year continued to decline, as expected, in our Closed Block segment in both 2013 and 2012. Further discussion of premium income for each of our segments, as well as our outlook for future premium growth, is included in "Segment Results" as follows.

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Net investment income was slightly lower in 2013 relative to 2012 due primarily to a decline in the yield on invested assets, partially offset by a higher level of invested assets. Miscellaneous net investment income, which includes income from bond calls and private equity partnership investments, was relatively consistent on a consolidated basis but exhibited more year-over-year volatility on an operating segment level. Net investment income was slightly lower in 2012 relative to 2011 due primarily to a decline in yield on invested assets, an increase in the amortization of the principal amount invested in our tax credit partnerships, and lower income on our Unum UK inflation index-linked bonds. These declines were mostly offset by a higher level of invested assets, higher bond call premiums, an increase in income from private equity partnership investments, and higher prepayment income on mortgage-backed securities.

We recognized a net realized investment gain of $6.8 million in 2013, compared to a gain of $56.2 million in 2012 and a loss of $4.9 million in 2011. Included in the 2013 net realized gain was a realized investment loss of $30.0 million recognized on the sale of certain securities during the early part of the third quarter of 2013. When interest rates increased during that time period, we sold certain of our lower yielding fixed maturity securities to take advantage of the higher interest rate environment by reinvesting the proceeds into higher yielding securities, thereby increasing our investment yield and also improving the credit quality of our fixed maturity securities portfolio. Included in the 2011 net realized loss was an other-than-temporary impairment loss on fixed maturity securities of $19.9 million. Also included in our realized investment gains and losses is the change in the fair value of an embedded derivative in a modified coinsurance arrangement, which resulted in a realized gain of $30.7 million and $51.8 million in 2013 and 2012, respectively, and a loss of $39.4 million in 2011.

The consolidated benefit ratios were 86.5 percent in 2013 compared to 87.1 percent in 2012 and 95.9 percent in 2011. Excluding the 2013 reserve adjustments in our life insurance product lines within the Unum US and Colonial Life segments, the benefit ratio for 2013 was 86.4 percent, and excluding the 2011 reserve adjustments in our Closed Block segment, the benefit ratio for 2011 was 85.9 percent. The underlying risk results in 2013 for each of our principal operating business segments, as well as for the majority of our product lines within those segments, were favorable or consistent with 2012. The year-over-year increase in the benefit ratio for 2012 relative to the level of 2011was primarily attributable to adverse risk results in our Unum UK group life line of business and in our Closed Block long-term care line of business. Risk results in our Unum US segment for 2012 were generally consistent with the level reported in 2011, and the benefit ratio for Colonial Life was only slightly elevated in 2012 compared to 2011. Further discussion of our line of business risk results for each of our segments is included in "Segment Results" as follows.

Interest and debt expense for 2013 was higher than 2012 due primarily to the issuance of $250.0 million of debt in August 2012, offset partially by lower interest expense on our floating rate debt and the purchase and retirement of the debt held by Tailwind Holdings, LLC (Tailwind Holdings) in January 2013. Interest and debt expense for 2012 was slightly higher than 2011 due primarily to the issuance of $250.0 million of debt in August 2012, partially offset by the maturity of $225.1 million of debt in March 2011.

The deferral of acquisition costs in 2013 was generally consistent with 2012. The deferral increased in 2012 compared to 2011, with continued growth in certain of our product lines and the associated increase in deferrable expenses more than offsetting the lower level of deferrable costs in product lines with lower growth.

The amortization of acquisition costs was higher year-over-year in both 2013 and 2012 due to continued growth in the level of the deferred asset for certain of our product lines and the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive life products. We also experienced a higher level of policy terminations relative to assumptions for certain issue years within some of our Unum US supplemental and voluntary product lines during 2013. At December 31, 2011, we determined that our long-term care deferred acquisition costs were not recoverable, and we recognized an impairment charge at that time. Further discussion of deferred acquisition costs and amortization by product line for each of our segments is included in "Segment Results" as follows.

Other expenses, including compensation expense, were in aggregate lower in 2013 and 2012 relative to the prior year periods due in part to our continued focus on operating effectiveness and expense management. Also contributing to the decline in 2013 relative to 2012 was a reduction in the amortization of our net actuarial loss due to pension plan amendments adopted in 2013 as well as expense reductions associated with reinsurance agreements entered into during 2013. Partially offsetting the lower expenses resulting from active expense management were increased costs for our pension and other postretirement benefit plans in 2012 as compared to 2011. For further discussion of the 2013 pension plan amendments, see Note 9 in the "Notes to Consolidated Financial Statements" contained herein in Item 8.

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Our income tax for 2013, 2012, and 2011 includes reductions of $6.3 million, $9.3 million, and $6.8 million, respectively, to reflect the impact of the decrease in the U.K. corporation tax rate changes on our net deferred tax liability related to our U.K. operations. Also lowering our income tax rate in 2013 and 2012 relative to the preceding year is an increase in the level of our investments in low-income housing tax credit partnerships. Our 2012 income tax includes a release of an $11.0 million tax liability related to unrecognized tax benefits. Our 2011 income tax includes a reduction in federal income taxes of $41.3 million due to a final settlement with the IRS and an $18.6 million tax related to the repatriation of £150.0 million of dividends from our U.K. subsidiaries. See Note 7 in the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further information on our income tax.

Reconciliation of Non-GAAP Financial Measures

We analyze our performance using non-GAAP financial measures. A non-GAAP financial measure is a numerical measure of a company's performance, financial position, or cash flows that excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. The non-GAAP financial measures of "operating revenue," "before-tax operating income" or "before-tax operating loss," and "after-tax operating income" differ from total revenue, income before income tax, and net income as presented in our consolidated operating results and in income statements prepared in accordance with GAAP due to the exclusion of net realized investment gains and losses, non-operating retirement-related gains or losses, and certain other items as specified in the reconciliations below. We believe operating revenue and operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. Realized investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains or losses. Although we may experience realized investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities. The amortization of prior period actuarial gains or losses, a component of the net periodic benefit cost for our pensions and other postretirement benefit plans, is driven by market performance as well as plan amendments and is not indicative of the operational results of our businesses. We believe that excluding the amortization of prior period gains or losses from operating income or loss provides investors with additional information for comparison and analysis of our operating results. Although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and have historically increased or decreased over time, depending on plan amendments and market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of "operating revenue" to total revenue and "before-tax operating income" to income before income tax is as follows:

(in millions of dollars)
	Year Ended December 31
	2013			2012			2011
Operating Revenue	$	10,347.0		$	10,459.2		$	10,282.9
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Total Revenue	$	10,353.8		$	10,515.4		$	10,278.0
Before-tax Operating Income	$	1,241.8		$	1,239.7		$	1,323.2
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Non-operating Retirement-related Loss	(32.9		)	(46.4		)	(31.9		)
Unclaimed Death Benefits Reserve Increase	(95.5		)	—			—
Group Life Waiver of Premium Benefit Reserve Reduction	85.0			—			—
Deferred Acquisition Costs Impairment and Reserve Charges for Long-term Care Closed Block	—			—			(769.6		)
Reserve Charge for Individual Disability Closed Block	—			—			(183.5		)
Income Before Income Tax	$	1,205.2		$	1,249.5		$	333.3

51

The after-tax impacts of these items are reflected in the following reconciliation of after-tax operating income to net income.

	Year Ended December 31
	2013						2012						2011
	(in millions)			per share *			(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	882.5		$	3.32		$	887.5		$	3.15		$	905.4		$	2.98
Net Realized Investment Gain (Loss), Net of Tax	3.9			0.02			37.1			0.13			(3.6		)	(0.01		)
Non-operating Retirement-related Loss, Net of Tax	(21.4		)	(0.08		)	(30.2		)	(0.11		)	(20.7		)	(0.07		)
Unclaimed Death Benefits Reserve Increase, Net of Tax	(62.1		)	(0.24		)	—			—			—			—
Group Life Waiver of Premium Benefit Reserve Reduction, Net of Tax	55.2			0.21			—			—			—			—
Deferred Acquisition Costs Impairment and Reserve Charges for Long-term Care Closed Block, Net of Tax	—			—			—			—			(500.3		)	(1.65		)
Reserve Charge for Individual Disability Closed Block, Net of Tax	—			—			—			—			(119.3		)	(0.39		)
Tax Reduction from IRS Settlement	—			—			—			—			41.3			0.14
Tax Related to U.K. Repatriation	—			—			—			—			(18.6		)	(0.06		)
Net Income	$	858.1		$	3.23		$	894.4		$	3.17		$	284.2		$	0.94
* Assuming Dilution

Consolidated Sales Results

Shown below are sales results for our three principal operating business segments.

(in millions)
	Year Ended December 31
	2013		% Change		2012		% Change		2011
Unum US	$	745.6	(2.0	)%	$	760.5	7.5	%	$	707.3
Unum UK	£	48.4	(18.7	)%	£	59.5	(5.1	)%	£	62.7
Colonial Life	$	367.6	1.6	%	$	361.9	(1.1	)%	$	365.9

Sales shown in the preceding chart generally represent the annualized premium income on new sales which we expect to receive and report as premium income during the next 12 months following or beginning in the initial quarter in which the sale is reported, depending on the effective date of the new sale. Sales do not correspond to premium income reported as revenue in accordance with GAAP. This is because new annualized sales premiums reflect current sales performance and what we expect to recognize as premium income over a 12 month period, while premium income reported in our financial statements is reported on an "as earned" basis rather than an annualized basis and also includes renewals and persistency of in-force policies written in prior years as well as current new sales.

Sales, persistency of the existing block of business, employment and salary growth, and the effectiveness of a renewal program are indicators of growth in premium income. Trends in new sales, as well as existing market share, also indicate the potential for growth in our respective markets and the level of market acceptance of price changes and new product offerings. Sales results may fluctuate significantly due to case size and timing of sales submissions.

See "Segment Results" as follows for a discussion of sales by segment.

52

Segment Results

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Closed Block, and Corporate. Financial information for each of our reporting segments is as follows.

Unum US Segment

The Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business, which are comprised of individual disability - recently issued insurance and voluntary benefits products.

Unum US Operating Results

Shown below are financial results for the Unum US segment. In the sections following, financial results and key ratios are also presented for the major lines of business within the segment.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income	$	4,517.1		1.4	%	$	4,456.5		3.7	%	$	4,296.0
Net Investment Income	929.6			(2.4	)	952.3			0.1		951.4
Other Income	128.3			3.0		124.6			2.5		121.6
Total	5,575.0			0.8		5,533.4			3.1		5,369.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	3,222.4			(0.5	)	3,238.6			4.0		3,113.5
Commissions	505.2			(0.5	)	507.5			7.1		474.0
Interest and Debt Expense	0.1			(90.9	)	1.1			10.0		1.0
Deferral of Acquisition Costs	(252.0		)	1.1		(249.2		)	13.1		(220.3		)
Amortization of Deferred Acquisition Costs	230.0			17.0		196.5			4.5		188.1
Other Expenses	1,000.7			0.9		991.8			(0.4	)	995.8
Total	4,706.4			0.4		4,686.3			2.9		4,552.1
Income Before Income Tax and Net Realized Investment Gains and Losses	868.6			2.5		847.1			3.7		816.9
Unclaimed Death Benefits (UDB) Reserve Increase	75.4			—		—			—		—
Group Life Waiver of Premium Benefit (Waiver) Reserve Reduction	(85.0		)	—		—			—		—
Operating Income	$	859.0		1.4		$	847.1		3.7		$	816.9
Operating Ratios (% of Premium Income):
Benefit Ratio	71.3		%			72.7		%			72.5		%
Benefit Ratio Excluding the UDB and Waiver Reserve Adjustments	71.6		%
Other Expense Ratio	22.2		%			22.3		%			23.2		%
Income Ratio	19.2		%			19.0		%			19.0		%
Operating Income Ratio	19.0		%			19.0		%			19.0		%

53

Unum US Group Disability Operating Results

Shown below are financial results and key performance indicators for Unum US group disability.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	1,553.9		(1.6	)%	$	1,578.8		(0.1	)%	$	1,580.2
Group Short-term Disability	519.6			9.0		476.7			4.7		455.2
Total Premium Income	2,073.5			0.9		2,055.5			1.0		2,035.4
Net Investment Income	550.1			(4.6	)	576.9			(4.6	)	605.0
Other Income	95.6			2.0		93.7			4.8		89.4
Total	2,719.2			(0.3	)	2,726.1			(0.1	)	2,729.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,732.9			(0.5	)	1,741.6			1.1		1,722.1
Commissions	164.0			3.0		159.3			(0.1	)	159.5
Interest and Debt Expense	0.1			(90.9	)	1.1			10.0		1.0
Deferral of Acquisition Costs	(29.6		)	12.5		(26.3		)	20.1		(21.9		)
Amortization of Deferred Acquisition Costs	21.1			15.3		18.3			(7.6	)	19.8
Other Expenses	532.3			(1.2	)	539.0			(1.5	)	547.0
Total	2,420.8			(0.5	)	2,433.0			0.2		2,427.5
Operating Income	$	298.4		1.8		$	293.1		(3.0	)	$	302.3
Operating Ratios (% of Premium Income):
Benefit Ratio	83.6		%			84.7		%			84.6		%
Other Expense Ratio	25.7		%			26.2		%			26.9		%
Operating Income Ratio	14.4		%			14.3		%			14.9		%
Persistency:
Group Long-term Disability	87.2		%			90.7		%			90.2		%
Group Short-term Disability	88.0		%			88.0		%			89.9		%

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Premium income increased slightly in 2013 compared to 2012 primarily due to growth from rate increases, partially offset by a decline in persistency in the group long-term disability product line. The weak pace of economic growth, low levels of employment growth, and competitive environment continue to pressure our premium income growth, including growth from existing customers. Net investment income declined in 2013 relative to 2012 due to decreases in the level of invested assets, lower income from bond call premiums, and a decrease in the yield on invested assets. Other income for 2013 included fees from administrative services products of $78.5 million compared to $81.7 million in 2012. Also included in other income for 2013 is a gain of $4.0 million on the purchase and retirement of the debt issued by Tailwind Holdings.

Risk results were favorable in 2013 compared to 2012 due to favorable claim incidence rates and continued strong claim recovery experience. These results were partially offset by the decrease in the discount rate which we implemented during the third quarter of 2012 for new group long-term disability claim incurrals.

The deferral and amortization of acquisition costs were both higher in 2013 relative to the prior year due to an increase in deferrable expenses and the resulting continued growth in the level of the deferred asset. The other expense ratio for 2013 was lower compared to 2012 as we continue to focus on operating effectiveness and expense management relative to our premium income levels.

54

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Premium income increased slightly in 2012 compared to 2011 due to sales growth and generally stable persistency levels. High unemployment levels and the competitive environment continued to pressure our premium income growth, including growth from existing customers. Net investment income declined in 2012 relative to 2011 due to a decrease in income from bond call premiums, a decrease in the level of invested assets, and a decline in yield on invested assets, partially offset by an increase in the level of prepayment income on mortgage-backed securities. Other income for 2012 included fees from administrative services products of $81.7 million compared to $77.9 million in 2011.

Risk results were slightly unfavorable in 2012 compared to 2011 due primarily to a 50 basis point decrease in the discount rate during the third quarter of 2012 for group long-term disability new claim incurrals compared to a 25 basis point decrease during the third quarter of 2011. Long-term disability claim recoveries were favorable in 2012 relative to 2011.

The deferral of acquisition costs in 2012 was higher than 2011 due primarily to a higher level of sales. The amortization of deferred acquisition costs was lower in 2012 compared to the prior year due to a decrease in amortization related to internal replacement transactions. The other expense ratio was lower in 2012 relative to 2011 due primarily to higher premium income and our focus on operating effectiveness and expense management.

55

Unum US Group Life and Accidental Death and Dismemberment Operating Results

Shown below are financial results and key performance indicators for Unum US group life and accidental death and dismemberment.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Group Life	$	1,213.9		2.7	%	$	1,182.1		6.8	%	$	1,106.7
Accidental Death & Dismemberment	121.6			5.5		115.3			5.6		109.2
Total Premium Income	1,335.5			2.9		1,297.4			6.7		1,215.9
Net Investment Income	142.6			(2.9	)	146.9			8.4		135.5
Other Income	1.8			(5.3	)	1.9			(13.6	)	2.2
Total	1,479.9			2.3		1,446.2			6.8		1,353.6
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	909.9			(2.8	)	936.4			9.6		854.6
Commissions	108.9			4.1		104.6			9.5		95.5
Deferral of Acquisition Costs	(24.7		)	10.3		(22.4		)	21.1		(18.5		)
Amortization of Deferred Acquisition Costs	15.6			14.7		13.6			(4.2	)	14.2
Other Expenses	198.2			2.6		193.1			(3.1	)	199.3
Total	1,207.9			(1.4	)	1,225.3			7.0		1,145.1
Income Before Income Tax and Net Realized Investment Gains and Losses	272.0			23.1		220.9			5.9		208.5
Unclaimed Death Benefits (UDB) Reserve Increase	49.1			—		—			—		—
Group Life Waiver of Premium Benefit (Waiver) Reserve Reduction	(85.0		)	—		—			—		—
Operating Income	$	236.1		6.9		$	220.9		5.9		$	208.5
Operating Ratios (% of Premium Income):
Benefit Ratio	68.1		%			72.2		%			70.3		%
Benefit Ratio Excluding the UDB and Waiver Reserve Adjustments	70.8		%
Other Expense Ratio	14.8		%			14.9		%			16.4		%
Income Ratio	20.4		%			17.0		%			17.1		%
Operating Income Ratio	17.7		%			17.0		%			17.1		%
Persistency:
Group Life	88.1		%			90.6		%			88.0		%
Accidental Death & Dismemberment	88.8		%			90.0		%			88.2		%

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Premium income increased in 2013 compared to 2012 primarily due to growth in the inforce block of business as a result of sales and rate increases, partially offset by a decline in persistency. Net investment income was lower in 2013 compared to 2012 primarily due to a decrease in the yield on invested assets and lower income from bond call premiums, partially offset by an increase in investment income attributable to tax credit partnerships and the level of invested assets.

Risk results were favorable compared to 2012 primarily as a result of the previously discussed reserve reduction for group life waiver of premium benefits, partially offset by the reserve increase for unclaimed death benefits charge. Excluding these reserve adjustments, risk results were favorable in 2013 compared to 2012 due primarily to more favorable experience related to the group life waiver of premium benefits.

The deferral and amortization of acquisition costs were both higher in 2013 relative to the prior year due to an increase in deferrable expenses and the resulting continued growth in the level of the deferred asset. The other expense ratio in 2013 was consistent with the prior year.

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Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Premium income was higher in 2012 compared to 2011 due primarily to higher sales and favorable persistency. Net investment income was higher in 2012 compared to 2011 due primarily to an increase in income from bond call premiums, an increase in the level of invested assets, and an increase in the level of prepayment income on mortgage-backed securities, partially offset by a decline in yield on invested assets.

Risk results were unfavorable in 2012 compared to 2011 due primarily to a higher average claim size and a higher claim incidence rate. Commissions and the deferral of acquisition costs were higher in 2012 compared to 2011 due primarily to higher sales. The amortization of deferred acquisition costs was lower in 2012 compared to 2011 due primarily to a decrease in amortization related to internal replacement transactions. The other expense ratio was lower in 2012 compared to 2011 due to our focus on operating effectiveness and expense management relative to our premium income levels.

Unum US Supplemental and Voluntary Operating Results

Shown below are financial results and key performance indicators for Unum US supplemental and voluntary product lines.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	465.3		(2.6	)%	$	477.6		2.8	%	$	464.7
Voluntary Benefits	642.8			2.7		626.0			7.9		580.0
Total Premium Income	1,108.1			0.4		1,103.6			5.6		1,044.7
Net Investment Income	236.9			3.7		228.5			8.3		210.9
Other Income	30.9			6.6		29.0			(3.3	)	30.0
Total	1,375.9			1.1		1,361.1			5.9		1,285.6
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	579.6			3.4		560.6			4.4		536.8
Commissions	232.3			(4.6	)	243.6			11.2		219.0
Deferral of Acquisition Costs	(197.7		)	(1.4	)	(200.5		)	11.5		(179.9		)
Amortization of Deferred Acquisition Costs	193.3			17.4		164.6			6.8		154.1
Other Expenses	270.2			4.0		259.7			4.1		249.5
Total	1,077.7			4.8		1,028.0			5.0		979.5
Income Before Income Tax and Net Realized Investment Gains and Losses	298.2			(10.5	)	333.1			8.8		306.1
Unclaimed Death Benefits (UDB) Reserve Increase	26.3			—		—			—		—
Operating Income	$	324.5		(2.6	)	$	333.1		8.8		$	306.1
Interest Adjusted Loss Ratio:
Individual Disability - Recently Issued	29.6		%			31.2		%			30.8		%
Operating Ratios (% of Premium Income):
Benefit Ratios:
Individual Disability - Recently Issued	51.3		%			52.4		%			52.2		%
Voluntary Benefits	53.0		%			49.5		%			50.7		%
Benefit Ratio Excluding the UDB Reserve Increase
Voluntary Benefits	48.9		%
Other Expense Ratio	24.4		%			23.5		%			23.9		%
Income Ratio	26.9		%			30.2		%			29.3		%
Operating Income Ratio	29.3		%			30.2		%			29.3		%
Persistency:
Individual Disability - Recently Issued	90.5		%			91.4		%			89.3		%
Voluntary Benefits	77.0		%			78.9		%			80.5		%

57

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Premium income was generally consistent in 2013 compared to 2012, with growth in voluntary benefits offset by a decrease in the individual disability - recently issued product line due to a reinsurance contract entered into during the second quarter of 2013 to cede a small block of individual disability business. Persistency for both individual disability - recently issued and voluntary benefits declined relative to the prior year due to a higher level of policy terminations in the early part of 2013. Net investment income was higher in 2013 compared to the prior year due to an increase in the level of invested assets, an increase in investment income attributable to tax credit partnerships, and higher income from bond call premiums, partially offset by a decline in the yield on invested assets.

Risk results for the individual disability - recently issued product line were favorable during 2013 compared to 2012 due to higher claim recoveries and the impact of a release of active life reserves related to the termination of a large inforce policy in 2013. Risk results for voluntary benefits were unfavorable compared to 2012 as a result of the previously discussed reserve increase for unclaimed death benefits. Excluding this reserve increase, risk results for voluntary benefits were slightly favorable in 2013 compared to the prior year due to favorable experience in the life and critical illness product lines.

Commissions were lower in 2013 relative to 2012 due primarily to amounts ceded under the individual disability reinsurance contract previously discussed. The deferral of acquisition costs was generally consistent in 2013 compared to 2012. The amortization of deferred acquisition costs was higher in 2013 compared to the prior year due to a less favorable year-over-year impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive voluntary life products as well as a higher level of policy terminations relative to assumptions for certain issue years within certain of our product lines. The other expense ratio in 2013 was higher than 2012 due primarily to lower premium income resulting from the reinsurance contract entered into during 2013 in our individual disability - recently issued product line as well as higher expenses associated with our voluntary benefits products.

The individual disability - recently issued product line had goodwill of approximately $187.5 million at December 31, 2013, none of which is currently believed to be at risk for future impairment.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Premium income was higher in 2012 compared to 2011 due primarily to continued sales growth and stable persistency. Net investment income was higher in 2012 compared to 2011 due primarily to an increase in the level of invested assets, an increase in bond call premiums and other fees, and an increase in the level of prepayment income on mortgage-backed securities, partially offset by a decline in yield on invested assets.

Risk results for the individual disability - recently issued line of business were unfavorable in 2012 compared to 2011 due primarily to higher submitted incidence rates, partially offset by higher claim recoveries. Risk results for voluntary benefits were favorable in 2012 compared to 2011 driven primarily by the release of active life reserves associated with individual contracts that terminated and bought voluntary group coverage during 2012.

Commissions and the deferral of acquisition costs were higher in 2012 compared to 2011 due to higher sales. The amortization of deferred acquisition costs was higher in 2012 compared to 2011 due to unfavorable persistency relative to assumptions for certain issue years within certain of our product lines, including the impact on persistency from individual contracts that terminated and bought voluntary group coverage during 2012. Partially offsetting this increase in amortization was a reduction in amortization due to a more favorable year-over-year impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive voluntary life products. The other expense ratio decreased slightly due to a continued focus on operating effectiveness and expense management.

58

Sales

(in millions of dollars)
	Year Ended December 31
	2013		% Change		2012		% Change		2011
Sales by Product
Group Disability and Group Life and AD&D
Group Long-term Disability	$	173.3	(4.9	)%	$	182.2	10.4	%	$	165.0
Group Short-term Disability	101.9		4.6		97.4		14.7		84.9
Group Life and AD&D	199.4		(3.9	)	207.5		2.3		202.9
Subtotal	474.6		(2.6	)	487.1		7.6		452.8
Supplemental and Voluntary
Individual Disability - Recently Issued	52.2		(8.4	)	57.0		2.5		55.6
Voluntary Benefits	218.8		1.1		216.4		8.8		198.9
Subtotal	271.0		(0.9	)	273.4		7.4		254.5
Total Sales	$	745.6	(2.0	)	$	760.5	7.5		$	707.3
Sales by Market Sector
Group Disability and Group Life and AD&D
Core Market (< 2,000 lives)	$	324.4	(3.1	)%	$	334.9	4.0	%	$	322.1
Large Case Market	150.2		(1.3	)	152.2		16.4		130.7
Subtotal	474.6		(2.6	)	487.1		7.6		452.8
Supplemental and Voluntary	271.0		(0.9	)	273.4		7.4		254.5
Total Sales	$	745.6	(2.0	)	$	760.5	7.5		$	707.3

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Sales in our Unum US group core and large case market segments declined in 2013 relative to 2012. In both markets, sales to existing accounts increased in 2013 but this increase was more than offset by a decrease in new account sales. The decline in new sales in our group core market was driven by fewer sales opportunities in the small-size employer market segment during 2013, which we believe may be temporarily attributable to healthcare reform as well as the uncertain economic and political environment. We believe the decline in new sales in our large case market was partially due to our disciplined and opportunistic approach to sales growth. The sales mix in our group market sector in 2013 was approximately 68 percent core market and 32 percent large case market, generally consistent with 2012.

Sales of voluntary benefits were higher in 2013 compared to 2012, with an increase in core market sales partially offset by a decrease in large case market sales. New account sales increased during 2013 but were partially offset by a decrease in sales to existing customers, primarily in the large case market. Sales in our individual disability - recently issued line of business, which are primarily concentrated in the multi-life market, were lower in 2013 compared to 2012 due to lower sales growth from existing customers.

We continue to believe that the group core market and voluntary benefits market, which combined together were approximately 73 percent of our Unum US sales for 2013, represent significant growth opportunities. We will continue to seek disciplined and opportunistic growth in the group large case and individual disability markets.  While in the short term we expect economic trends, premium rate increases for certain of our group products, and the market distraction which we believe has resulted from the implementation of healthcare reform will continue to pressure our sales growth, we believe we are well positioned to expand existing relationships and leverage our brand and market leadership.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Unum US sales were higher in 2012 compared to 2011, with growth in each of our product lines and in each of our major market segments. Sales in our group core market segment were higher in 2012 relative to 2011, with increases in each of the product lines within this market segment. The number of new accounts added in our group core market segment during 2012 was 1.9 percent higher than the number of new accounts added during 2011.

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Sales in our group large case market segment were higher in 2012 compared to 2011, with increases in each of the product lines within this market segment. We continued our disciplined and opportunistic approach to sales growth in the large case market during 2012, and although the level of sales in this market segment was higher than in 2011, our new business pricing was within our guidelines. Our sales mix in 2012 was approximately 69 percent core market and 31 percent large case market, generally consistent with 2011.

Sales of voluntary benefits were higher in 2012 compared to 2011 due primarily to strong large case sales and increases in sales to both new and existing customers. The number of new accounts added in the voluntary benefits product line was 6.9 percent lower in 2012 than the number of new accounts added during 2011. Sales in our individual disability - recently issued line of business were 2.5 percent higher in 2012 compared to 2011 due primarily to higher sales to existing customers.

Segment Outlook

We believe that premium growth, particularly growth within existing customer accounts, will continue to be pressured during 2014 by the weak pace of economic growth, low levels of employment growth, the competitive environment, and the distraction caused by political instability and the implementation of healthcare reform. Although we expect to achieve marginal year-over-year growth in premium income during 2014, opportunities for further premium growth are not expected to re-emerge until the economy improves and employment growth accelerates. Our net investment income may be impacted, either favorably or unfavorably, by fluctuations in bond call premiums and other types of miscellaneous net investment income. The low interest rate environment and the tightening of credit spreads continue to place near-term pressure on our profit margins by impacting net investment income yields and claim reserve discount rates. As a result of the continued low interest rate environment and the aging of insureds, we began initiating price increases for our group disability products during 2012 and will continue with these pricing levels on new and renewal business throughout 2014. We anticipate that the 2014 benefit ratio for our group disability product line will be slightly below the level of 2013. Our amortization of deferred acquisition costs may be unfavorably impacted, particularly in our voluntary benefits product line, by higher than expected policy terminations. We believe future profit margin improvement is achievable, driven primarily by our continued product mix shift, expense efficiencies, and consistent operating effectiveness.

Certain risks and uncertainties are inherent in the disability insurance business. Components of claims experience, such as incidence and recovery rates, may be worse than we expect. Disability claim incidence and claim recovery rates may be influenced by, among other factors, the rate of unemployment and consumer confidence. Within the group disability market, pricing and renewal actions can be taken to react to higher claim rates or lower discount rates, but these actions take time to implement, and there is a risk that the market will not sustain increased prices. In addition, changes in economic and external conditions may not manifest themselves in claims experience for an extended period of time. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We have previously taken steps to improve our risk profile, including reducing our exposure to volatile business segments through diversification by market size, product segment, and industry segment. Claim incidence levels may fluctuate due to the normal volatility that occurs in group disability business or may be related to economic conditions. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

We remain confident that our strategy of focusing on protecting consumers, broadening client relationships, and building collaborative partnerships will enable us to achieve our long-term financial objectives. We continue to see future growth opportunity based on employee choice, defined employer funding, superior service, and effective communication. Our focused offerings, risk management discipline, consistent benefits performance, and expense management have enabled us to deliver earnings growth. We believe we will reach our long-term sales and premium objectives by capturing opportunities emerging in our core group and voluntary markets to grow them at above-market rates, despite short-term sales pressure from healthcare reform’s impact and increased competition and changing distribution dynamics in the voluntary benefits market. We intend to maintain our focus on persistency of our inforce block and on increasing participation levels from existing customers. Our continued investments in partnerships and market expansion should enhance our ability to grow the market over the long term. We believe our operational excellence and the benefits derived from investments in our technology infrastructure will improve our cost position.

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Unum UK Segment

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental lines of business which include individual disability and critical illness. Unum UK's products are sold primarily in the United Kingdom through field sales personnel and independent brokers and consultants.

Operating Results

Shown below are financial results and key performance indicators for the Unum UK segment.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	389.9		(4.8	)%	$	409.7		(2.4	)%	$	419.6
Group Life	106.4			(51.9	)	221.3			8.7		203.6
Supplemental	60.3			(5.2	)	63.6			(1.2	)	64.4
Total Premium Income	556.6			(19.9	)	694.6			1.0		687.6
Net Investment Income	148.5			(13.1	)	170.8			(10.1	)	189.9
Other Income	0.1			—		0.1			(66.7	)	0.3
Total	705.2			(18.5	)	865.5			(1.4	)	877.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	413.3			(23.7	)	541.4			9.6		493.8
Commissions	38.0			(10.8	)	42.6			(6.8	)	45.7
Deferral of Acquisition Costs	(9.8		)	(16.9	)	(11.8		)	(23.4	)	(15.4		)
Amortization of Deferred Acquisition Costs	14.7			(6.4	)	15.7			2.6		15.3
Other Expenses	117.0			(20.0	)	146.3			(0.9	)	147.7
Total	573.2			(21.9	)	734.2			6.9		687.1
Operating Income	$	132.0		0.5		$	131.3		(31.1	)	$	190.7
Operating Ratios (% of Premium Income):
Benefit Ratio	74.3		%			77.9		%			71.8		%
Other Expense Ratio	21.0		%			21.1		%			21.5		%
Operating Income Ratio	23.7		%			18.9		%			27.7		%
Persistency:
Group Long-term Disability	82.2		%			84.0		%			86.6		%
Group Life	66.7		%			82.5		%			89.3		%
Supplemental	78.8		%			84.6		%			87.3		%

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Foreign Currency Translation

The functional currency of Unum UK is the British pound sterling. Unum UK's premium income, net investment income, claims, and expenses are received or paid in pounds, and we hold pound-denominated assets to support Unum UK's pound-denominated policy reserves and liabilities. We translate Unum UK's pound-denominated financial statement items into dollars for our consolidated financial reporting. We translate income statement items using an average exchange rate for the reporting period, and we translate balance sheet items using the exchange rate at the end of the period. We report unrealized foreign currency translation gains and losses in accumulated other comprehensive income in our consolidated balance sheets.

Fluctuations in the pound to dollar exchange rate have an effect on Unum UK's reported financial results and our consolidated financial results. In periods when the pound weakens relative to the preceding period, as occurred during 2013 and 2012, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens relative to the preceding period, translating pounds into dollars increases current period results relative to the prior period.

(in millions of pounds, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	£	249.2		(3.6	)%	£	258.4		(1.2	)%	£	261.6
Group Life	68.2			(51.1	)	139.6			9.9		127.0
Supplemental	38.5			(4.0	)	40.1			—		40.1
Total Premium Income	355.9			(18.8	)	438.1			2.2		428.7
Net Investment Income	94.9			(11.9	)	107.7			(9.0	)	118.4
Other Income	0.1			—		—			—		0.1
Total	450.9			(17.4	)	545.8			(0.3	)	547.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	264.5			(22.5	)	341.4			11.0		307.7
Commissions	24.3			(9.7	)	26.9			(5.6	)	28.5
Deferral of Acquisition Costs	(6.2		)	(17.3	)	(7.5		)	(21.1	)	(9.5		)
Amortization of Deferred Acquisition Costs	9.3			(6.1	)	9.9			5.3		9.4
Other Expenses	74.7			(19.0	)	92.2			0.1		92.1
Total	366.6			(20.8	)	462.9			8.1		428.2
Operating Income	£	84.3		1.7		£	82.9		(30.3	)	£	119.0
Weighted Average Pound/Dollar Exchange Rate	1.566					1.584					1.603

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Premium income was lower in 2013 compared to 2012 due primarily to reinsurance agreements we entered into effective January 1, 2013 to cede an additional portion of our group life business. The reinsurance agreements significantly decreased premium income and benefit payments for group life during 2013 and also reduced volatility in this line of business. Premium income in 2013 was also unfavorably impacted by continued pressure on persistency resulting from the initiation of premium rate increases, partially offset by an increase in premium income as a result of rate increases in existing customer accounts.

Net investment income declined in 2013 compared to 2012 due primarily to decreases in the yield on invested assets and in the level of invested assets. We also reported lower income from inflation index-linked bonds which we invest in to support the claim reserves associated with certain of our group policies that provide for inflation-linked increases in benefits.

Group long-term disability risk results were unfavorable in 2013 compared to 2012 due primarily to lower claim recoveries. Group life risk results were favorable in 2013 compared to 2012 due primarily to lower mortality rates on the retained business. Supplemental risk results were favorable in 2013 compared to 2012 due to lower claim incidence rates for the group critical illness product line.

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Commissions and deferral of acquisition costs were lower in 2013 compared to 2012 due to expenses ceded under the group life reinsurance agreements and a lower level of sales in 2013. The amortization of deferred acquisition costs and the other expense ratio were generally consistent in 2013 compared to the prior year.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Premium income was higher in 2012 compared to 2011, although premium growth and persistency were unfavorably impacted by the initiation of premium rate increases in our group long-term disability and group life product lines. Group long-term disability premium income was lower in 2012 compared to 2011 due to a decline in persistency resulting primarily from premium rate increases, partially offset by an increase in premium income due to growth in existing customer accounts. Group life premium income increased in 2012 relative to 2011 as a result of premium rate increases and higher new business sales, partially offset by lower persistency resulting primarily from premium rate increases.

Net investment income declined in 2012 compared to 2011 due primarily to lower income on inflation index-linked bonds, a decrease in invested asset yields, and lower income from bond call premiums, partially offset by an increase in the level of invested assets.

Group long-term disability risk results were unfavorable in 2012 compared to 2011 due primarily to less favorable claim recoveries and higher incidence rates. Group life risk results were unfavorable in 2012 compared to 2011 due to a higher average claim size and higher claim volumes. Supplemental risk results were favorable in 2012 compared to 2011 due to lower claim incidence rates in the group critical illness and individual disability products.

Commissions and the deferral of acquisition costs were both lower in 2012 compared to 2011 due primarily to a lower level of individual disability product sales. The amortization of deferred acquisition costs was higher in 2012 compared to 2011 due primarily to an increase in internal replacement transactions. The other expense ratio was lower in 2012 compared to 2011 due primarily to higher premium income and continued expense management initiatives.

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Sales

Shown below are sales results in dollars and in pounds for the Unum UK segment.

(in millions)
	Year Ended December 31
	2013		% Change		2012		% Change		2011
Sales by Product
Group Long-term Disability	$	50.5	(1.4	)%	$	51.2	7.1	%	$	47.8
Group Life	21.4		(43.7	)	38.0		(13.2	)	43.8
Supplemental	3.9		(20.4	)	4.9		(43.0	)	8.6
Total Sales	$	75.8	(19.4	)	$	94.1	(6.1	)	$	100.2
Sales by Market Sector
Group Long-term Disability and Group Life
Core Market (< 500 lives)	$	38.9	0.5	%	$	38.7	3.2	%	$	37.5
Large Case Market	33.0		(34.7	)	50.5		(6.7	)	54.1
Subtotal	71.9		(19.4	)	89.2		(2.6	)	91.6
Supplemental	3.9		(20.4	)	4.9		(43.0	)	8.6
Total Sales	$	75.8	(19.4	)	$	94.1	(6.1	)	$	100.2
Sales by Product
Group Long-term Disability	£	32.2	(0.3	)%	£	32.3	8.4	%	£	29.8
Group Life	13.7		(43.2	)	24.1		(12.4	)	27.5
Supplemental	2.5		(19.4	)	3.1		(42.6	)	5.4
Total Sales	£	48.4	(18.7	)	£	59.5	(5.1	)	£	62.7
Sales by Market Sector
Group Long-term Disability and Group Life
Core Market (< 500 lives)	£	24.9	2.0	%	£	24.4	4.3	%	£	23.4
Large Case Market	21.0		(34.4	)	32.0		(5.6	)	33.9
Subtotal	45.9		(18.6	)	56.4		(1.6	)	57.3
Supplemental	2.5		(19.4	)	3.1		(42.6	)	5.4
Total Sales	£	48.4	(18.7	)	£	59.5	(5.1	)	£	62.7

Sales in Unum UK's group long-term disability product line during 2013 were consistent with 2012, with higher new account sales and an increase in core market sales offset by a decrease in sales to existing customers and a decline in sales in the large case market. Group life sales were lower in 2013 compared to 2012 as a result of declines in new account sales in both the core and large case markets, which more than offset higher sales to existing customers. The decrease in group life sales was due in part to pricing discipline and the initiation of rate increases on new business. Also impacting the comparability of group life sales relative to 2012 was the discontinuance of new sales of certain of our group life product lines beginning in the third quarter of 2012. Supplemental sales were lower in 2013 compared to 2012 due primarily to lower sales in our individual disability product line.

Sales in Unum UK's group long-term disability product line were higher in 2012 compared to 2011 due to higher new account sales in both the core and large case markets, partially offset by lower sales to existing customers. Group life sales were lower in 2012 compared to 2011 due to our discontinuance of new sales of certain of our group life product lines, lower large case sales, and lower sales to existing customers, partially offset by higher core market sales. Supplemental sales were lower in 2012 compared to the 2011 due primarily to lower sales in our group critical illness and individual disability product lines.

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Segment Outlook

Our primary focus during 2014 is to build key capabilities to enable us to deliver future growth. Our shift in business mix and focus on premium rate increases for both group long-term disability and group life is expected to continue to improve our profitability. However, pressure on new sales and persistency is likely to continue, and the low interest rate environment is expected to dampen overall earnings growth. We intend to continue with our group life reinsurance program during 2014, although we have increased our retention level for our group life products that provide lump sum benefits. We expect that the challenging economic and competitive pricing environment in the U.K. which has continued to negatively impact Unum UK's premium growth may continue in the near term. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

In our group life business, our near-term actions regarding rate increases, reinsurance, and the discontinuance of certain product lines have reduced volatility. We will continue to implement rate increases in 2014, and we believe profit margins will continue to improve. Although group life premium income may decline as a result of these actions and a shift in business mix, during 2013 the increase to premium income from rate increases largely offset the impact of policy terminations.

In our group long-term disability business, we remain committed to driving growth in the U.K. market, although we continue to have a cautious outlook for growth given the current environment. We anticipate returning to more normal levels of premium growth as our rate increases continue to be placed in the market and as we continue to increase sales to new and existing customers. We have seen some positive results in terms of new to market sales and increased coverage in existing cases. In addition, we continue to focus on new market opportunities by raising awareness of the need for income protection. Expanding group long-term disability market penetration remains a significant opportunity and priority in the U.K.

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Colonial Life Segment

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees at the workplace through an independent contractor agency sales force and brokers.

Operating Results

Shown below are financial results and key performance indicators for the Colonial Life segment.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	738.7		2.0	%	$	724.5		4.2	%	$	695.3
Life	221.1			5.4		209.7			10.0		190.7
Cancer and Critical Illness	272.4			4.6		260.3			4.4		249.3
Total Premium Income	1,232.2			3.2		1,194.5			5.2		1,135.3
Net Investment Income	145.4			4.9		138.6			4.7		132.4
Other Income	0.2			(33.3	)	0.3			(40.0	)	0.5
Total	1,377.8			3.3		1,333.4			5.1		1,268.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	667.0			6.3		627.3			6.4		589.4
Commissions	252.5			(0.8	)	254.5			3.5		245.9
Deferral of Acquisition Costs	(205.0		)	(0.6	)	(206.3		)	1.6		(203.1		)
Amortization of Deferred Acquisition Costs	174.2			4.6		166.5			10.1		151.2
Other Expenses	224.3			3.3		217.1			1.1		214.7
Total	1,113.0			5.1		1,059.1			6.1		998.1
Income Before Income Tax and Net Realized Investment Gains and Losses	264.8			(3.5	)	274.3			1.6		270.1
Unclaimed Death Benefits (UDB) Reserve Increase	20.1			—		—			—		—
Operating Income	$	284.9		3.9		$	274.3		1.6		$	270.1
Operating Ratios (% of Premium Income):
Benefit Ratio	54.1		%			52.5		%			51.9		%
Benefit Ratio Excluding the UDB Reserve Increase	52.5		%
Other Expense Ratio	18.2		%			18.2		%			18.9		%
Income Ratio	21.5		%			23.0		%			23.8		%
Operating Income Ratio	23.1		%			23.0		%			23.8		%
Persistency:
Accident, Sickness, and Disability	75.2		%			75.7		%			73.8		%
Life	85.2		%			85.7		%			85.0		%
Cancer and Critical Illness	83.1		%			84.5		%			84.0		%

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Premium income increased in 2013 relative to 2012 due to continued growth in the inforce block of business as a result of sales and stable persistency. Net investment income increased in 2013 due to an increase in the level of invested assets and higher income from bond call premiums and private equity partnership investments, partially offset by a decrease in the yield on invested assets.

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Our reported risk results were unfavorable compared to 2012 as a result of the previously discussed reserve increase for unclaimed death benefits. Excluding this reserve increase, the benefit ratio of 52.5% was consistent with the level of 2012, with favorable risk results in the life product line, due to improved mortality experience, offsetting less favorable risk results in the accident, sickness, and disability and cancer and critical illness product lines that resulted from an increased level of incurred claims.

Commissions and the deferral of acquisition costs were generally consistent in 2013 compared to the prior year. The amortization of deferred acquisition costs was higher in 2013 compared to 2012 due to continued growth in the level of the deferred asset as well as an unfavorable impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive life products. The increase in other expenses in 2013 compared to 2012 was commensurate with the growth in premium income.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Premium income increased in 2012 relative to 2011 due primarily to prior period sales growth and improved persistency. Net investment income was higher in 2012 compared to 2011 as a result of growth in the level of invested assets, an increase in income from private equity partnership investments, and a higher level of fees from mortgage loan prepayments, partially offset by a decline in income from bond call premiums and a decrease in yield.

Risk results were unfavorable in 2012 compared to 2011 for the life and cancer and critical illness product lines, partially offset by favorable risk results for the accident, sickness, and disability product line.  The unfavorable risk results for the life product line in 2012 were driven by higher mortality rates, which can exhibit volatility from period to period.  Risk results for the cancer and critical illness product line were slightly unfavorable in 2012 due primarily to a higher level of paid claims in the cancer product line and a higher active life reserve change due to favorable persistency for certain issue years. The slightly favorable risk results in the accident, sickness, and disability product line in 2012 were due to favorable claim experience in the disability product.

Commissions and the deferral of acquisition costs were both higher in 2012 compared to 2011 due primarily to an increase in costs related to growth in new business premium.The amortization of deferred acquisition costs was higher in 2012 compared to 2011 due to an increase in the level of the deferred asset as well as a less favorable year-over-year impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive life product. The other expense ratio was lower in 2012 compared to 2011 due primarily to higher premium income and a continued focus on expense management.

Sales

(in millions of dollars)
	Year Ended December 31
	2013		% Change		2012		% Change		2011
Sales by Product
Accident, Sickness, and Disability	$	238.2	2.2	%	$	233.0	(4.1	)%	$	242.9
Life	68.1		1.2		67.3		2.7		65.5
Cancer and Critical Illness	61.3		(0.5	)	61.6		7.1		57.5
Total Sales	$	367.6	1.6		$	361.9	(1.1	)	$	365.9
Sales by Market Sector
Commercial
Core Market (< 1,000 lives)	$	246.0	(0.9	)%	$	248.3	0.1	%	$	248.0
Large Case Market	49.0		19.8		40.9		(6.8	)	43.9
Subtotal	295.0		2.0		289.2		(0.9	)	291.9
Public Sector	72.6		(0.1	)	72.7		(1.8	)	74.0
Total Sales	$	367.6	1.6		$	361.9	(1.1	)	$	365.9

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Colonial Life's sales for 2013 were slightly higher than 2012, with growth in existing account sales in all market segments. This growth was partially offset by a slight decrease in new account sales, with the decline primarily occurring in the core market segment. Although large case commercial market sales were significantly higher than 2012, our new business pricing was within our guidelines as we continued our disciplined yet opportunistic approach to sales growth in this market. We believe the 2013 decrease in core commercial market sales, particularly in the small employer segment, may be partially attributable to healthcare reform as well as the uncertain economic and political environment. The number of new accounts decreased 18.2 percent in 2013 compared to 2012, while the average new case size increased 20.0 percent.

Colonial Life's sales were lower in 2012 relative to 2011, with a decrease in new account sales partially offset by an increase in existing account sales. Commercial market sales in 2012 were lower than 2011, with a decline in large case commercial market sales which was only partially offset by a slight increase in core commercial market sales. Sales also declined in the public sector market in 2012 compared to 2011. The number of new accounts decreased 5.0 percent in 2012 compared to 2011, while the average new case size was 4.2 percent lower.

Segment Outlook

Current economic conditions continue to affect employment growth and buying conditions which, in turn, impact sales and premium growth. We believe proper execution of our growth strategy and a gradual improvement in the economy will deliver sales and premium growth that are in line with long-term expectations. We see the continuing U.S. economic conditions and the increasing competition in the voluntary market as external risks to achievement of our business plans. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

We expect our sales momentum to improve during 2014 relative to the growth rate for 2013, further contributing to premium growth. Volatility in net investment income is likely to continue during 2014 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. Regarding risk results, periods of economic downturns have historically had minimal impact on Colonial Life, due primarily to a diversified product portfolio that is designed with short duration, indemnity benefits.  We expect our overall benefit ratio for 2014 to be generally consistent with the level of 2013, excluding the reserve increase for unclaimed death benefits, and we believe our strong profit margins will continue.

We believe our success will be driven primarily by execution in the core commercial and public sector segments and through expansion of the overall market as well as further geographic expansion of our market within the United States. The market environment continues to shift at a rapid pace, and we believe our products, capabilities, and service offerings will enable us to succeed in this marketplace. We intend to continue to focus on operational excellence through a strong continuous improvement culture, risk management practices, focus on talent development, and cross-business collaboration.

Closed Block Segment

The Closed Block segment consists of individual disability, group and individual long-term care, and other insurance products no longer actively marketed. The individual disability line of business in this segment generally consists of policies we sold prior to the mid-1990s and entirely discontinued selling in 2004, other than update features contractually allowable on existing policies. We discontinued offering individual long-term care in 2009 and group long-term care in 2012. Other insurance products include group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous product lines.

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Operating Results

Shown below are financial results and key performance indicators for the Closed Block segment.

(in millions of dollars, except ratios)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability	$	687.5		(6.6	)%	$	736.4		(6.4	)%	$	787.0
Long-term Care	630.6			(0.2	)	631.9			3.9		608.1
All Other	0.7			(68.2	)	2.2			N.M.		0.2
Total Premium Income	1,318.8			(3.8	)	1,370.5			(1.8	)	1,395.3
Net Investment Income	1,272.3			3.4		1,230.5			3.4		1,189.7
Other Income	93.9			(6.2	)	100.1			(5.7	)	106.1
Total	2,685.0			(0.6	)	2,701.1			0.4		2,691.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	2,293.0			(0.9	)	2,314.9			(23.2	)	3,012.8
Commissions	113.8			1.1		112.6			(0.9	)	113.6
Interest and Debt Expense	8.4			(19.2	)	10.4			(1.0	)	10.5
Deferral of Acquisition Costs	—			—		—			—		(3.7		)
Amortization of Deferred Acquisition Costs	—			—		—			—		11.1
Impairment of Long-term Care Deferred Acquisition Costs	—			—		—			—		196.0
Other Expenses	160.4			(4.4	)	167.7			(6.8	)	180.0
Total	2,575.6			(1.2	)	2,605.6			(26.0	)	3,520.3
Income (Loss) Before Income Tax and Net Realized Investment Gains and Losses	109.4			14.6		95.5			111.5		(829.2		)
Individual Disability Reserve Charge	—			—		—			—		183.5
Long-term Care Reserve Charge	—			—		—			—		573.6
Impairment of Long-term Care Deferred Acquisition Costs	—			—		—			—		196.0
Operating Income	$	109.4		14.6		$	95.5		(22.9	)	$	123.9
Interest Adjusted Loss Ratios:
Individual Disability	82.6		%			83.0		%			108.0		%
Long-term Care	89.6		%			90.1		%			179.3		%
Interest Adjusted Loss Ratios Excluding the Reserve Charges:
Individual Disability											84.7		%
Long-term Care											84.9		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	12.2		%			12.2		%			12.9		%
Income (Loss) Ratio	8.3		%			7.0		%			(59.4		)%
Operating Income Ratio	8.3		%			7.0		%			8.9		%
Persistency:
Individual Disability	91.8		%			92.5		%			92.9		%
Long-term Care	95.5		%			95.8		%			96.0		%
N.M. = not a meaningful percentage

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Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Total premium income decreased in 2013 compared to 2012 due to expected policy terminations and maturities. The premium decrease resulting from persistency trends in the long-term care line of business was partially offset by the favorable impact of premium rate increases on certain policies as well as the issuance of group long-term care certificates on inforce cases. We continue to file requests with various state insurance departments for premium rate increases on certain of our individual and group long-term care policies. The rate increases reflect current interest rates and claim experience, higher expected future claims, persistency, and other factors related to pricing long-term care coverage.  In states for which a rate increase is submitted and approved, customers are also given options for coverage changes or other approaches that might fit their current financial and insurance needs.

Net investment income was higher in 2013 compared to 2012 due primarily to higher invested asset levels, partially offset by a decrease in the yield on invested assets. Other income, which includes the underlying results of certain blocks of reinsured business and the net investment income of portfolios held by those ceding companies to support the block we have reinsured, was lower in 2013 compared to 2012 due in part to lower investment income in the portfolios held by the ceding companies.

Individual disability risk results for 2013 were slightly favorable compared to 2012 due primarily to lower claim incidence rates. Long-term care risk results were slightly favorable in 2013 compared to 2012 due to more favorable development in active life reserves.

Interest and debt expense in 2013 was lower than 2012 due to principal repayments on the outstanding debt issued by Northwind Holdings, LLC (Northwind Holdings) and a decrease in the floating rate of interest. The other expense ratio was consistent in 2013 compared to 2012.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Total premium income decreased in 2012 compared to 2011, with lower individual disability premium income partially offset by higher long-term care premium income. The decrease in individual disability premium income was due to the run-off of this closed line of business, driven by expected policy terminations and maturities. The increase in long-term care premium income was due to issuances of group long-term care policies and the implementation of rate increases on certain of our individual long-term care policies. Although we announced in the first quarter of 2012 that we would no longer sell group long-term care, we had group cases which were already in the quoting and/or underwriting process at the time of our announcement and for which we subsequently issued the policies.

Net investment income was higher in 2012 compared to 2011 due to higher asset levels, higher bond call premiums, and higher prepayment income on mortgage-backed securities and other fees, partially offset by a decline in yield on invested assets. Other income, which includes the underlying results of certain blocks of reinsured business and the net investment income of portfolios held by those ceding companies to support the block we have reinsured, was lower in 2012 compared to 2011 due to lower investment income in the portfolios held by the ceding companies.

Individual disability risk results for 2012 were favorable compared to 2011 due to the previously discussed 2011 reserve charge. Excluding this charge, individual disability risk results were favorable compared to 2011 due to higher claim recovery rates and a decrease in reserves for existing claims. Long-term care risk results were favorable in 2012 compared to 2011 due primarily to the 2011 reserve charge. Excluding this charge, risk results were unfavorable compared to 2011 due to higher claim incidence rates, partially offset by higher claim resolutions.

Interest and debt expense in 2012 was generally consistent with 2011, as principal repayments on the amount of outstanding debt issued by Northwind Holdings were offset by an increase in the floating rate of interest on this debt.We had no amortization of deferred acquisition costs in 2012 due to the long-term care impairment charge recognized at December 31, 2011. The other expense ratio was lower in 2012 compared to 2011 due primarily to a decrease in selling and underwriting costs due to our discontinuance of the sale of group long-term care in 2012 and our continued focus on operating effectiveness and expense management.

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Segment Outlook

Operating revenue and income for this segment will continue to decline over time as these closed blocks of business wind down, although we do expect additional premium income associated with long-term care rate increases. We also expect a small amount of group long-term care certificates to continue to be issued where we are required to do so under the terms of existing group policies. We expect that this segment may experience volatility in net investment income due to the volatility of bond call premiums relative to historical levels. During 2014, we intend to continue our focus on operational effectiveness, rate increases, and capital management. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

Profitability of our long-tailed products is affected by claims experience related to mortality and morbidity, investment returns, and persistency.  We believe that the interest adjusted loss ratios for the individual disability and long-term care lines of business will be relatively flat over the long term, but these product lines may experience quarterly volatility, particularly in the near term for our long-term care product lines as our claim block matures. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and external factors and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period. It is possible that variability in any of our reserve assumptions, including, but not limited to, interest rates, mortality, morbidity, and persistency, could result in a material impact on our reserve levels, including adjustments to reserves previously established under loss recognition.

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Corporate Segment

The Corporate segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt other than non-recourse debt, and certain other corporate income and expense not allocated to a line of business.

Operating Results

(in millions of dollars)
	Year Ended December 31
	2013			% Change		2012			% Change		2011
Operating Revenue
Net Investment Income	$	(3.7	)	(116.1	)%	$	23.0		(59.1	)%	$	56.2
Other Income	7.7			175.0		2.8			(86.4	)	20.6
Total	4.0			(84.5	)	25.8			(66.4	)	76.8
Interest and Other Expenses	147.5			9.8		134.3			(13.5	)	155.2
Operating Loss	$	(143.5	)	(32.3	)	$	(108.5	)	(38.4	)	$	(78.4	)

Year Ended December 31, 2013 Compared with Year Ended December 31, 2012

Net investment income was lower in 2013 compared to 2012 due to a decrease in the yield on invested assets, a decrease in reported investment income attributable to tax credit partnerships, and lower short-term interest rates. The negative impact on net investment income and operating income attributable to tax credit partnerships is offset by a lower income tax rate due to the tax benefits recognized as a result of these investments. Other income was higher in 2013 compared to 2012 due primarily to $4.0 million of income recognized in 2013 related to a settlement of our appeal to the IRS for tax years 2005 to 2006.

Interest and other expenses were higher in 2013 compared to 2012 due primarily to the interest expense related to the issuance of $250.0 million of 5.75% senior notes in August 2012 and a higher level of expense accruals in 2013 compared to 2012, partially offset by a lower rate of interest on fixed rate debt that we have effectively converted to floating rate debt.

Year Ended December 31, 2012 Compared with Year Ended December 31, 2011

Net investment income was lower in 2012 compared to 2011 due to lower asset levels, a lower proportion of assets invested at long-term interest rates, a decrease in bond call premiums, and a decrease in investment income attributable to tax credit partnerships. Other income was lower in 2012 compared to 2011 due primarily to $17.5 million of interest income recognized in 2011 related to a settlement of our appeal to the IRS related to tax years 1996 to 2004.

Interest and other expenses were lower in 2012 compared to 2011 due primarily to the maturity of $225.1 million of 7.625% senior notes in March 2011, a lower level of expense accruals during 2012, comparatively higher expenses in 2011 due in part to corporate initiatives, and state income taxes recognized during 2011 as a result of the repatriation of U.K. dividends from our U.K. subsidiaries in 2011. Partially offsetting these decreases was an impairment of a long-lived fixed asset recognized during 2012 and higher interest expense due to the issuance of the $250.0 million senior notes in August 2012.

Segment Outlook

We expect the quality of our investment portfolio to remain strong. The impact on net investment income attributable to tax credit partnerships is likely to continue to negatively impact net investment income for our Corporate segment throughout 2014. However, this is offset by a lower income tax rate due to the tax benefits recognized as a result of these investments. We are currently holding capital at our insurance subsidiaries and holding companies at levels that exceed our long-term requirements. We expect to continue to generate excess capital on an annual basis through our statutory earnings. While we intend to maintain our disciplined approach to risk management, we believe we are well positioned with substantial flexibility to preserve our capital strength and at the same time explore opportunities to deploy the excess capital that is generated each period.

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Investments

Overview

Our investment portfolio is well diversified by type of investment and industry sector. We have established an investment strategy that we believe will provide for adequate cash flows from operations and allow us to hold our securities through periods where significant decreases in fair value occur. We believe our emphasis on risk management in our investment portfolio, including credit and interest rate management, has positioned us well and generally reduced the volatility in our results.

Below is a summary of our formal investment policy, including the overall quality and diversification objectives:

• The majority of investments are in high quality publicly traded securities to ensure the desired liquidity and preserve the capital value of our portfolios.

• The long-term nature of our insurance liabilities also allows us to invest in less liquid investments to obtain superior returns. A maximum of 10 percent of the total investment portfolio may be invested in below-investment-grade securities, 2 percent in equity securities, 3 percent in tax credit partnerships, 35 percent in private placements, and 10 percent in commercial mortgage loans. The remaining assets can be held in publicly traded investment-grade corporate securities, mortgage/asset backed securities, bank loans, government and government agencies, and municipal securities.

• We intend to manage the risk of losses due to changes in interest rates by matching asset duration with liabilities, in the aggregate.

• The weighted average credit quality rating of the portfolio should be Baa1 or higher.

• The maximum investment per issuer group is limited based on internal limits reviewed by the finance committee of Unum Group's board of directors and approved by the boards of directors of our insurance subsidiaries and is more restrictive than the five percent limit generally allowed by the state insurance departments which regulate the type of investments our insurance subsidiaries are allowed to own. These internal limits are as follows:

Rating	Internal Limit
	($ in millions)
AAA/AA	$	200
A	175
BBB+	150
BBB	125
BBB-	90
BB+	75
BB	60
BB-	50
B+	30
B/B-	20
CCC	10

• The portfolio is to be diversified across industry classification and geographic lines.

• Derivative instruments may be used to replicate permitted asset classes, hedge interest rate risk, credit risk, and foreign currency risk, and match liability duration and cash flows consistent with the plan reviewed by the finance committee of Unum Group's board of directors and approved by the boards of directors of our insurance subsidiaries.

• Asset mix guidelines and limits are established by us, reviewed by the finance committee of Unum Group's board of directors, and approved by the boards of directors of our insurance subsidiaries.

• The allocation of assets and the selection and timing of the acquisition and disposition of investments are subject to ratification, on a weekly basis, by an investment subcommittee appointed by the boards of directors of our insurance subsidiaries. These actions are also reviewed by the finance committee of Unum Group's board of directors on a quarterly basis.

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• We review these investment policies and guidelines annually, or more frequently if deemed necessary, and recommend adjustments, as appropriate. Any revisions or exceptions are reviewed by the finance committee of Unum Group's board of directors and must be approved by the boards of directors of our insurance subsidiaries.

See "Critical Accounting Estimates" contained in this Item 7 for further discussion of our valuation of investments.

Investment Results

Net investment income was slightly lower in 2013 relative to 2012 due primarily to a decline in the yield on invested assets, partially offset by a higher level of invested assets. Miscellaneous net investment income, which includes income from bond calls and private equity partnership investments, was relatively consistent on a consolidated basis but exhibited more year-over-year volatility on an operating segment level.

Net investment income was slightly lower in 2012 relative to 2011 due primarily to a decline in yield on invested assets, an increase in the amortization of the principal amount invested in our tax credit partnerships, and lower income on our Unum UK inflation index-linked bonds. These declines were mostly offset by a higher level of invested assets, higher bond call premiums, an increase in income from private equity partnership investments, and higher prepayment income on mortgage-backed securities.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.28 percent as of December 31, 2013, compared to a yield of 6.47 percent as of December 31, 2012. Duration is a measure of the percentage change in the fair values of assets and liabilities for a given change in interest rates. Cash flows from the in-force asset and liability portfolios are projected at varying interest rate levels to obtain a range of projected cash flows under different interest rate scenarios.

To assess the impact of a duration mismatch which may occur under the different interest rate scenarios, we measure the potential changes in estimated fair value based on a hypothetical change in interest rates to quantify a dollar value change. Although we test the asset and liability portfolios under various interest rate scenarios as part of our modeling, the majority of our liabilities related to insurance contracts are not interest rate sensitive, and we therefore have minimal exposure to policy withdrawal risk. Our determination of investment strategy relies more on long-term measures such as reserve adequacy analysis and the relationship between the portfolio yields supporting our various product lines and the aggregate discount rates embedded in the reserves.

Realized investment gains and losses, before tax, are as follows:

(in millions of dollars)
	Year Ended December 31
	2013			2012			2011
Fixed Maturity Securities
Gross Gains on Sales	$	15.8		$	29.3		$	74.0
Gross Losses on Sales	(45.7		)	(20.4		)	(24.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—			(19.9		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	15.6			5.0			7.1
Gross Losses on Sales	—			(4.3		)	(0.5		)
Impairment Loss	(2.0		)	(1.9		)	(0.6		)
Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8			(39.4		)
Other Derivatives	(1.9		)	—			—
Foreign Currency Transactions	(4.9		)	(3.3		)	(1.6		)
Net Realized Investment Gain (Loss)	$	6.8		$	56.2		$	(4.9	)

During the third quarter of 2013, when interest rates increased during the early part of the quarter, we sold certain of our lower yielding fixed maturity securities to take advantage of the higher interest rate environment by reinvesting the proceeds into higher yielding mortgage-backed and corporate securities, thereby increasing our investment yield and also improving the credit quality of our fixed maturity securities portfolio. The securities sold had a book value of $408.9 million and generated a realized loss of $30.0 million.

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We had no individual realized investment losses of $10.0 million or greater from other-than-temporary impairments during 2013, 2012, or 2011.

We had no individual realized investment losses of $10.0 million or greater from the sale of fixed maturity securities during 2013 or 2011. During 2012, we recognized a loss of $11.2 million on the sale of securities issued by a large U.S. department store chain. In 2011, the company's management was replaced by a new team of executives that embarked on a radically different retailing strategy. While the company had ample liquidity and sizable value in real estate assets, initial operating results under this new strategy had been significantly below market expectations, and there was uncertainty as to whether this new strategy would be successful. Because of this, we had concerns that liquidity could be compromised over an extended period of time. At the time of disposition, these securities had been in an unrealized loss position for a period of greater than three years.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our realized investment gains and losses a calculation intended to estimate the fair value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. The change in fair value of this embedded derivative during 2013, 2012, and 2011 resulted primarily from a change in credit spreads in the overall investment market.

Fixed Maturity Securities

The fair values and associated unrealized gains and losses of our fixed maturity securities portfolio, by industry classification, are as follows:

Fixed Maturity Securities - By Industry Classification

As of December 31, 2013

(in millions of dollars)
Classification	Fair Value		Net Unrealized Gain		Fair Value of Fixed Maturity Securities with Gross Unrealized Loss		Gross Unrealized Loss		Fair Value of Fixed Maturity Securities with Gross Unrealized Gain		Gross Unrealized Gain
Basic Industry	$	2,446.5	$	153.9	$	543.4	$	38.1	$	1,903.1	$	192.0
Capital Goods	3,677.9		333.7		517.0		18.2		3,160.9		351.9
Communications	2,829.7		318.9		323.1		21.4		2,506.6		340.3
Consumer Cyclical	1,190.8		110.6		153.3		8.0		1,037.5		118.6
Consumer Non-Cyclical	5,617.7		539.7		836.1		52.5		4,781.6		592.2
Energy (Oil & Gas)	3,706.9		452.0		371.3		21.5		3,335.6		473.5
Financial Institutions	3,435.0		269.8		267.9		8.6		3,167.1		278.4
Mortgage/Asset-Backed	2,039.3		180.6		343.5		4.0		1,695.8		184.6
Sovereigns	1,373.2		146.8		87.2		2.8		1,286.0		149.6
Technology	1,138.1		73.2		389.1		21.4		749.0		94.6
Transportation	1,469.3		152.1		218.5		9.0		1,250.8		161.1
U.S. Government Agencies and Municipalities	2,979.3		244.7		496.0		45.6		2,483.3		290.3
Public Utilities	10,403.0		1,074.1		929.3		52.8		9,473.7		1,126.9
Redeemable Preferred Stocks	37.7		4.7		—		—		37.7		4.7
Total	$	42,344.4	$	4,054.8	$	5,475.7	$	303.9	$	36,868.7	$	4,358.7

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The following two tables show the length of time our investment-grade and below-investment-grade fixed maturity securities had been in a gross unrealized loss position as of December 31, 2013 and at the end of the prior four quarters. The relationships of the current fair value to amortized cost are not necessarily indicative of the fair value to amortized cost relationships for the securities throughout the entire time that the securities have been in an unrealized loss position nor are they necessarily indicative of the relationships after December 31, 2013. The increase in the unrealized loss on both investment-grade and below-investment-grade fixed maturity securities during 2013 was due primarily to an increase in U.S. Treasury rates which occurred during the period. We held no fixed maturity securities at December 31, 2013 with a gross unrealized loss of $10.0 million or greater.

Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013								2012
	December 31		September 30		June 30		March 31		December 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	20.0	$	12.3	$	176.6	$	9.7	$	3.9
> 90 <= 180 days	11.5		175.7		12.6		6.3		0.4
> 180 <= 270 days	183.3		12.3		12.3		0.4		0.4
> 270 days <= 1 year	12.6		9.5		0.1		0.1		0.3
> 1 year <= 2 years	11.0		1.0		1.7		0.5		0.2
> 2 years <= 3 years	—		0.1		3.4		3.3		5.9
> 3 years	6.9		10.2		9.1		7.5		12.3
Sub-total	245.3		221.1		215.8		27.8		23.4
Fair Value < 70% >= 40% of Amortized Cost
> 3 years	2.5		—		—		—		—
Total	$	247.8	$	221.1	$	215.8	$	27.8	$	23.4

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013								2012
	December 31		September 30		June 30		March 31		December 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	2.6	$	4.3	$	33.3	$	3.0	$	0.3
> 90 <= 180 days	2.5		38.1		1.6		0.4		1.4
> 180 <= 270 days	29.9		2.0		—		0.6		2.6
> 270 days <= 1 year	1.7		—		0.5		0.3		2.5
> 1 year <= 2 years	0.9		6.8		3.9		4.9		6.8
> 2 years <= 3 years	4.1		—		1.2		1.0		6.2
> 3 years	14.1		15.0		12.7		8.0		12.5
Sub-total	55.8		66.2		53.2		18.2		32.3
Fair Value < 70% >= 40% of Amortized Cost
> 3 years	0.3		0.3		0.3		0.3		0.3
Total	$	56.1	$	66.5	$	53.5	$	18.5	$	32.6

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At December 31, 2013, we had minimal exposure to investments for which the payment of interest and principal is guaranteed under a financial guaranty insurance policy, and all such securities are rated investment-grade absent the guaranty insurance policy. At December 31, 2013, we held $201.4 million fair value ($185.7 million amortized cost) of perpetual debentures, or "hybrid" securities, that generally have no fixed maturity date. Interest on these securities due on any payment date may be deferred by the issuer. The interest payments are generally deferrable only to the extent that the issuer has suspended dividends or other distributions or payments to any of its shareholders or any other perpetual debt instrument.

At December 31, 2013, our mortgage/asset-backed securities had an average life of 5.23 years, effective duration of 4.31 years, and a weighted average credit rating of Aa1. The mortgage/asset-backed securities are valued on a monthly basis using valuations supplied by the brokerage firms that are dealers in these securities as well as independent pricing services. One of the risks involved in investing in mortgage/asset-backed securities is the uncertainty of the timing of cash flows from the underlying loans due to prepayment of principal with the possibility of reinvesting the funds in a lower interest rate environment. We use models which incorporate economic variables and possible future interest rate scenarios to predict future prepayment rates. The timing of prepayment cash flows may also cause volatility in our recognition of investment income. We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income.

We have no exposure to subprime mortgages, "Alt-A" loans, or collateralized debt obligations in our investment portfolios. We have not invested in mortgage-backed derivatives, such as interest-only, principal-only, or residuals, where market values can be highly volatile relative to changes in interest rates. The credit quality of our mortgage-backed securities portfolio has not been negatively impacted by the issues in the market concerning subprime mortgage loans. The change in value of our mortgage-backed securities portfolio has moved in line with that of prime agency-backed mortgage-backed securities.

As of December 31, 2013, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $3,101.7 million and $3,199.3 million, respectively. Below-investment-grade securities are inherently more risky than investment-grade securities since the risk of default by the issuer, by definition and as exhibited by bond rating, is higher. Also, the secondary market for certain below-investment-grade issues can be highly illiquid. Additional downgrades may occur, but we do not anticipate any liquidity problems resulting from our investments in below-investment-grade securities, nor do we expect these investments to adversely affect our ability to hold our other investments to maturity.

Our investments in issuers in foreign countries are chosen for specific portfolio management purposes, including asset and liability management and portfolio diversification across geographic lines and sectors to minimize non-market risks. In our approach to investing in fixed maturity securities, specific investments within approved countries and industry sectors are evaluated for their market position and specific strengths and potential weaknesses.  For each security, we consider the political, legal, and financial environment of the sovereign entity in which an issuer is domiciled and operates. The country of domicile is based on consideration of the issuer's headquarters, in addition to location of the assets and the country in which the majority of sales and earnings are derived.  We continually evaluate our foreign investment risk exposure. We do not have foreign currency risk, as the cash flows from these investments are either denominated in currencies or hedged into currencies to match the related liabilities. We have no direct exposure to sovereign debt of these countries, no unfunded commitments to issuers domiciled in these countries, and have not used credit derivatives to hedge our exposure or to sell credit protection.

Our monitoring is heightened for investments in certain countries due to our concerns over the current economic and political environments as well as the banking crisis, and we believe these investments are more vulnerable to potential credit problems.  For those countries for which we have heightened our monitoring, the following table lists our exposure by country, together with a discussion on each exposure. We have neither direct nor indirect exposure to sovereign debt of any other countries for which we believe there is a heightened risk of sovereign default.

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European Fixed Maturity Securities Exposure - By Country

As of December 31, 2013

(in millions of dollars)
	Fair Value		Amortized Cost
Italy	$	233.4	$	228.6
Portugal	50.9		47.1
Spain	245.4		224.1
Total	$	529.7	$	499.8

Italy

We have no direct exposure to Italian financial institutions.  We believe there are risks associated with the debt sustainability of Italy given its political and economic pressures. As of December 31, 2013, all of our Italian investments were current on their obligations to us, and we believe they will continue to meet their debt obligations.  For those securities in an unrealized loss position, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments during the year ended December 31, 2013.

Portugal

We have no direct exposure to Portuguese financial institutions.  In May 2011, Portugal received a support package valued at €78 billion from the International Monetary Fund/European Union.  As of December 31, 2013, our holding domiciled in Portugal is a geographically diversified utility company that was downgraded to below-investment-grade during the first quarter of 2012. As of December 31, 2013, this company was current on its obligations to us, and we believe it will continue to meet its debt obligations.

Spain

We have no direct exposure to Spanish financial institutions, although we do own fixed maturity securities of a certain United Kingdom subsidiary of a Spanish financial institution. We believe there are risks associated with Spain's high unemployment, budget deficit, banking sector issues, recessionary pressures, and potential regional secession issues. All but one of our Spanish domiciled securities were rated investment-grade as of December 31, 2013, and all were current on their obligations to us. We believe they will continue to have the ability to meet their debt obligations. For those securities in an unrealized loss position, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments during the year ended December 31, 2013.

Risk Management

While we have no direct sovereign holdings in the aforementioned countries, we have performed comprehensive stress testing and scenario analyses on all of our corporate holdings of issuers domiciled in these countries. We have performed stress tests under a number of scenarios including deep recession, liquidity crisis, and currency redenomination with significant devaluation. We continue to closely monitor this situation.

Potential risks for these corporate holdings include a lack of access to credit in their countries of domicile and redenomination risk as it pertains to their outstanding liabilities. Under either of these scenarios, we believe the risk is largely mitigated because our holdings in these countries are non-financial and operate in defensive industries that provide essential services. Most are market leaders with access to diverse, global capital markets. Current developments regarding ratings downgrades, bailout packages, or higher sovereign interest rates have not had a material impact on our financial condition or results of operations.

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Mortgage Loans

Our mortgage loan portfolio was $1,815.1 million and $1,712.7 million on an amortized cost basis at December 31, 2013 and 2012, respectively. Our mortgage loan portfolio is comprised entirely of commercial mortgage loans. We believe our mortgage loan portfolio is well diversified geographically and among property types. The incidence of problem mortgage loans and foreclosure activity continues to be low. Due to conservative underwriting, we expect the level of problem loans to remain low relative to the industry.

We held one mortgage loan at December 31, 2013 that was considered impaired and was carried at the estimated net realizable value of $13.1 million, net of a valuation allowance of $1.5 million. We held two mortgage loans at December 31, 2012 which were considered impaired and were carried at the estimated net realizable value of $17.4 million, net of a valuation allowance of $1.5 million.

Derivative Financial Instruments

We use derivative financial instruments primarily to manage reinvestment, duration, foreign currency, and credit risks. Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps and U.S. Treasury rates, current and forward currency swaps, forward treasury locks, currency forward contracts, forward contracts on specific fixed income securities, and credit default swaps. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $5.5 million at December 31, 2013. We held $1.1 million of cash collateral from our counterparties at December 31, 2013. The carrying value of fixed maturity securities posted as collateral to our counterparties was $95.6 million at December 31, 2013. We had no cash collateral posted to our counterparties at December 31, 2013. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have a median credit rating of A3 or better, and by our use of cross-collateralization agreements.

Other

Our exposure to non-current investments, defined as foreclosed real estate and invested assets which are delinquent as to interest and/or principal payments, totaled $39.9 million and $63.3 million on a fair value basis at December 31, 2013 and December 31, 2012, respectively.

See Notes 3 and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of our investments and our derivative financial instruments.

Liquidity and Capital Resources

Overview

Our liquidity requirements are met primarily by cash flows provided from operations, principally in our insurance subsidiaries. Premium and investment income, as well as maturities and sales of invested assets, provide the primary sources of cash. Debt and/or securities offerings provide an additional source of liquidity. Cash is applied to the payment of policy benefits, costs of acquiring new business (principally commissions), operating expenses, and taxes, as well as purchases of new investments.

We have established an investment strategy that we believe will provide for adequate cash flows from operations. We attempt to match our asset cash flows and durations with expected liability cash flows and durations to meet the funding requirements of our business. However, deterioration in the credit market may delay our ability to sell our positions in certain of our fixed maturity securities in a timely manner and adversely impact the price we receive for such securities, which may negatively impact our cash flows. Furthermore, if we experience defaults on securities held in the investment portfolios of our insurance subsidiaries, this will negatively impact statutory capital, which could reduce our insurance subsidiaries' capacity to pay dividends to our holding companies. A reduction in dividends to our holding companies could force us to seek external financing to avoid impairing our ability to pay dividends to our stockholders or meet our debt and other payment obligations. As requirements of Dodd-Frank continue to take effect in 2014 and in subsequent years, to the extent that we enter into derivatives that are subject to centralized exchanges and cleared through a regulated clearinghouse, we may be subject to stricter collateral requirements which could have an adverse effect on our overall liquidity.

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Our policy benefits are primarily in the form of claim payments, and we have minimal exposure to the policy withdrawal risk associated with deposit products such as individual life policies or annuities. A decrease in demand for our insurance products or an increase in the incidence of new claims or the duration of existing claims could negatively impact our cash flows from operations. However, our historical pattern of benefits paid to revenues is consistent, even during cycles of economic downturns, which serves to minimize liquidity risk.

Cash equivalents and marketable securities held at Unum Group and our other intermediate holding companies are a significant source of liquidity for us and were approximately $514 million and $805 million at December 31, 2013 and 2012, respectively. The decline during 2013 was due primarily to repurchases of our common stock and a capital contribution of approximately $300 million related to our 2013 re-domestication of UnumProvident International Ltd. (UPIL) a captive reinsurance subsidiary, from Bermuda to the United States. The December 31, 2013 balance, of which approximately $230 million was held in certain of our foreign subsidiaries in the U.K., was comprised primarily of commercial paper, fixed maturity securities with a current average maturity of 1.7 years, and various money-market funds.  No significant restrictions exist on our ability to use or access these funds. We currently have no intent, nor do we foresee a need, to repatriate funds from our foreign subsidiaries in the U.K. We believe we hold domestic resources sufficient to fund our liquidity requirements for the next 12 months. If we repatriate additional funds from our subsidiaries in the U.K., the amounts repatriated would be subject to repatriation tax effects which generally equal the difference in the U.S. tax rate and the U.K. tax rate.

As part of our capital deployment strategy, we have in recent years repurchased shares of Unum Group's common stock, as authorized by our board of directors. Our current share repurchase program was approved by our board of directors in December 2013 and authorizes the repurchase of up to $750 million of common stock through June 2015, with the pace of repurchase activity to depend upon various factors such as the level of available cash, alternative uses for cash, and our stock price. This new authorization replaced the previous authorization of $750 million that was scheduled to expire in January 2014. The dollar value of shares remaining under the current repurchase program was approximately $730 million at December 31, 2013.

Cash Available from Subsidiaries

Unum Group and certain of its intermediate holding company subsidiaries depend on payments from subsidiaries to pay dividends to stockholders, to pay debt obligations, and/or to pay expenses. These payments by our insurance and non-insurance subsidiaries may take the form of dividends, operating and investment management fees, and/or interest payments on loans from the parent to a subsidiary.

Restrictions under applicable state insurance laws limit the amount of dividends that can be paid to a parent company from its insurance subsidiaries in any 12-month period without prior approval by regulatory authorities. For life insurance companies domiciled in the U.S., that limitation generally equals, depending on the state of domicile, either ten percent of an insurer's statutory surplus with respect to policyholders as of the preceding year end or the statutory net gain from operations, excluding realized investment gains and losses, of the preceding year. The payment of dividends to a parent company from a life insurance subsidiary is generally further limited to the amount of unassigned funds.

Certain of our domestic insurance subsidiaries cede blocks of business to Northwind Reinsurance Company (Northwind Re), Tailwind Reinsurance Company (Tailwind Re), and UPIL, all of which are affiliated captive reinsurance subsidiaries (captive reinsurers) with Unum Group as the ultimate parent. The captive reinsurers are all domiciled in the United States as of December 31, 2013. The ability of Northwind Re, Tailwind Re, and UPIL to pay dividends to their respective parent companies will depend on their satisfaction of applicable regulatory requirements and on the performance of the business reinsured by Northwind Re, Tailwind Re, and UPIL. See "Debt" contained herein in this Item 7 and Note 8 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of dividend restrictions for Northwind Re.

Unum Group and/or certain of its intermediate holding company subsidiaries may also receive dividends from our U.K. subsidiaries, the payment of which may be subject to applicable insurance company regulations and capital guidance in the U.K. Unum Limited will be impacted by new capital requirements and risk management standards under Solvency II which is to be adopted January 1, 2016.  Solvency II requirements have not been fully finalized, but the current proposals contain amended requirements on capital adequacy and risk management for insurers. Although the impact of Solvency II cannot be fully determined at this time, its implementation will result in changes to the capital, supervisory, and disclosure requirements applicable to our U.K. subsidiaries.

The payment of dividends to the parent company from our subsidiaries also requires the approval of the individual subsidiary's board of directors.

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The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries also depends on additional factors such as RBC ratios and capital adequacy and/or solvency requirements, funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. Unum Group's RBC ratio for its traditional U.S. insurance subsidiaries, calculated on a weighted average basis using the NAIC Company Action Level formula, was approximately 405 percent at December 31, 2013, compared to 396 percent at December 31, 2012. The capital adequacy and/or individual RBC ratios for each of our U.S. insurance subsidiaries, including our captive reinsurers, is above the range that would require state regulatory action.During 2014, we intend to maintain a level of capital in our U.S. and U.K. insurance subsidiaries above the applicable capital adequacy requirements and minimum solvency margins.

The amount available during 2013 for the payment of ordinary dividends from Unum Group's traditional U.S. insurance subsidiaries, which excludes our captive reinsurers, was $623.7 million, of which $550.4 million was declared and paid. The amount available during 2013 from Unum Limited was £144.7 million, of which £37.5 million was declared and paid to one of our U.K. holding companies. During 2013, Tailwind Re and Northwind Re paid dividends of $12.4 million and $43.3 million to Tailwind Holdings and Northwind Holdings, respectively. UPIL paid no dividends during 2013.

Although we may not utilize the entire amount of available dividends, based on applicable restrictions under current law, approximately $591 million is available, without prior approval by regulatory authorities, during 2014 for the payment of dividends from our traditional U.S. insurance subsidiaries, which excludes our captive reinsurers. Approximately £188 million is available for the payment of dividends from Unum Limited during 2014, subject to regulatory approval.

Insurance regulatory restrictions do not limit the amount of dividends available for distribution from non-insurance subsidiaries except where the non-insurance subsidiaries are held directly or indirectly by an insurance subsidiary and only indirectly by Unum Group.

Funding for Employee Retirement Benefits

In 2013, we adopted plan amendments which freeze participation and benefit accruals in our defined benefit pension plans in the U.S. and U.K., effective December 31, 2013 for the U.S. plans and June 30, 2014 for the U.K. plan. Because the amendments eliminate all future service accruals subsequent to the effective dates of the amendments, we were required to remeasure the benefit obligations of our pension plans, which decreased our net pension liability approximately $330 million with a corresponding increase in other comprehensive income, less applicable income tax of approximately $115 million as of the respective dates of remeasurement. Concurrent with our amendments to our defined benefit pension plans, we adopted amendments to increase the benefits under our defined contribution plans commensurate with the effective dates of the pension plan amendments.

We have met all minimum pension funding requirements set forth by ERISA. We made a voluntary contribution of $50.0 million to our U.S. qualified defined benefit plan during 2013, but we do not expect to make any additional contributions during 2014. We contribute to our U.K. pension plan sufficient to meet the minimum funding requirement under U.K. legislation. We made required contributions of £2.5 million during 2013, and we expect to make contributions of approximately £1.4 million during 2014. We made contributions during 2013 of approximately $18.8 million and £1.9 million to our U.S. and U.K. defined contribution plans, respectively, and expect to make contributions of approximately $71.5 million and £2.5 million during 2014.

We have estimated our future funding requirements under the Pension Protection Act of 2006 and under applicable U.K. law, considering the effects of the retirement benefit changes described herein, and do not believe that any future funding requirements will cause a material adverse effect on our liquidity. See Note 9 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussion of our employee benefit plans.

Debt

At December 31, 2013, we had short-term debt of $76.5 million, consisting entirely of securities lending agreements, and long-term debt of $2,612.0 million, consisting primarily of senior secured notes and junior subordinated debt securities.

There are no significant financial covenants associated with any of our outstanding debt obligations.  We continually monitor our compliance with our debt covenants and remain in compliance. We have not observed any current trends that would cause a breach of any debt covenants.

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Purchases and Retirement of Debt

In January 2013, we purchased and retired the outstanding principal of $62.5 million on the floating rate, senior secured non-recourse notes issued by Tailwind Holdings, resulting in a before-tax gain of $4.0 million. During 2012 and 2011, Tailwind Holdings made principal payments of $10.0 million each year.

Northwind Holdings made principal payments on its floating rate, senior secured notes of $60.0 million in both 2013 and 2012 and $74.4 million in 2011.

In 2011, we made debt repayments of $225.1 million at the maturity date of our remaining 7.625% senior notes due March 2011.

Issuance of Debt

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering. These notes, due 2042, bear interest at a fixed rate of 5.75% and are payable semi-annually. The notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt. The balance outstanding on these notes was $250.0 million at December 31, 2013.

In 2010, we issued $400.0 million of unsecured senior notes in a public offering. These notes, due in 2020, bear interest at a fixed rate of 5.625% and are payable semi-annually. The notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt. In addition, these notes are effectively subordinated to any indebtedness of our subsidiaries. The balance outstanding on these notes was $400.0 million at December 31, 2013.

In 2009, we issued $350.0 million of unsecured senior notes in a public offering. These notes, due in 2016, bear interest at a fixed rate of 7.125% and are payable semi-annually. The notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt. The balance outstanding on these notes was $350.0 million at December 31, 2013.

In 2007, Northwind Holdings issued $800.0 million floating rate, insured, senior, secured notes, due 2037, in a private offering. Recourse for the payment of principal, interest, and other amounts due on the notes will be limited to the collateral for the notes and other assets of Northwind Holdings, consisting primarily of the stock of its sole subsidiary Northwind Re. Northwind Holdings' ability to meet its payment obligations under the notes will be dependent principally upon its receipt of dividends from Northwind Re. The ability of Northwind Re to pay dividends to Northwind Holdings will depend on its satisfaction of applicable regulatory requirements and on the performance of the reinsured claims of Provident, Paul Revere and Unum America (the ceding insurers) reinsured by Northwind Re. None of Unum Group, the ceding insurers, Northwind Re or any other affiliate of Northwind Holdings is an obligor or guarantor with respect to the notes. The balance outstanding on these notes was $440.0 million at December 31, 2013.

In 2006, Tailwind Holdings issued $130.0 million floating rate, insured, senior, secured notes, due 2036, in a private offering. Recourse for the payment of principal, interest, and other amounts due on the notes was limited to the collateral for the notes and the other assets of Tailwind Holdings, consisting primarily of the stock of its sole subsidiary Tailwind Re. These notes were purchased and retired in January 2013.

In 2005, Unum Group repatriated $454.8 million in unremitted foreign earnings from its U.K. subsidiaries, and as part of its repatriation plan, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued $400.0 million of 6.85% senior debentures, due 2015, in a private offering. The debentures are fully and unconditionally guaranteed by Unum Group. The aggregate principal amount outstanding was $296.9 million at December 31, 2013.

In 2002, Unum Group issued $250.0 million of 7.375% senior debentures due 2032, in a public offering. The 7.375% notes have an aggregate principal amount outstanding of $39.5 million at December 31, 2013.

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In 1998, Unum Group completed public offerings of $200.0 million of 7.25% senior notes due 2028, $200.0 million of 7.0% senior notes due 2018, and $250.0 million of 6.75% senior notes due 2028. None of these amounts have been reduced other than the 6.75% notes, which have an aggregate principal amount outstanding of $165.8 million at December 31, 2013.

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures, which mature in 2038, to the trust in connection with the capital securities offering. The securities issued by the trust have an aggregate principal amount outstanding of $226.5 million at December 31, 2013.

Unum Group has medium-term notes with an aggregate principal amount outstanding of $50.8 million at December 31, 2013 which were initially issued in three separate series in 1990, 1993, and 1996, pursuant to an indenture dated September 15, 1990.  The notes are fixed maturity rate notes with fixed maturity dates ranging between nine months to thirty years from the issuance date. 

Credit Facility

In August 2013, we entered into a five-year, $400 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600 million. Borrowings under the facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The facility provides for interest rates based on either the prime rate or LIBOR. Our credit facility's financial covenants contain provisions regarding our leverage and net worth. We do not anticipate any violation of those covenants. However, if economic conditions worsen and we incur unexpected losses, we could violate certain of the financial covenants imposed by the credit facility and lose access to available funds through that facility. At December 31, 2013, no amount was outstanding on the facility. While maintenance of the unsecured revolving credit facility provides a valuable source of contingent liquidity, we believe operating cash flows are sufficient to support our short-term liquidity needs.

Shelf Registration

We have a shelf registration, which we renewed in 2011, with the Securities and Exchange Commission to issue various types of securities, including common stock, preferred stock, debt securities, depository shares, stock purchase contracts, units and warrants, or preferred securities of wholly-owned finance trusts.  The shelf registration enables us to raise funds from the offering of any securities covered by the shelf registration as well as any combination thereof, subject to market conditions and our capital needs.

See Note 8 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information.

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Commitments

The following table summarizes contractual obligations and our reinsurance recoverable by period as of December 31, 2013:

(in millions of dollars)
	Total		In 1 Year or Less		After 1 Year up to 3 Years		After 3 Years up to 5 Years		After 5 Years
Payments Due
Short-term Debt	$	76.5	$	76.5	$	—	$	—	$	—
Long-term Debt	4,357.3		143.2		905.5		400.2		2,908.4
Policyholder Liabilities	42,573.8		4,585.6		6,822.5		5,176.2		25,989.5
Pension and Other Postretirement Benefits	647.8		22.1		39.7		39.2		546.8
Miscellaneous Liabilities	567.2		510.2		16.3		11.7		29.0
Operating Leases	213.9		40.7		50.3		34.3		88.6
Purchase Obligations	331.3		321.3		9.8		0.2		—
Total	$	48,767.8	$	5,699.6	$	7,844.1	$	5,661.8	$	29,562.3
Receipts Due
Reinsurance Recoverable	$	7,692.6	$	295.3	$	653.8	$	534.3	$	6,209.2

Long-term debt includes contractual principal and interest payments and therefore exceeds the amount shown in the consolidated balance sheets. See Note 8 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information on our debt.

Policyholder liability maturities and the related reinsurance recoverable represent the projected payout of the current in-force policyholder liabilities and the expected cash inflows from reinsurers for liabilities ceded and therefore incorporate uncertainties as to the timing and amount of claim payments. We utilize extensive liability modeling to project future cash flows from the in-force business. The primary assumptions used to project future cash flows are claim incidence rates for mortality and morbidity, claim resolution rates, persistency rates, and interest rates. These cash flows are discounted to determine the current value of the projected claim payments. The timing and amount of payments on policyholder liabilities may vary significantly from the projections above. See our previous discussion of asset and liability management under "Investments" contained in this Item 7 and Note 1 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information.

Pensions and other postretirement benefit obligations include our defined benefit pension and postretirement plans for our employees, including non-qualified pension plans. Pension plan obligations, other than the non-qualified plans, represent our expected required regulatory contributions which at December 31, 2013 totaled $2.3 million. Non-qualified pension plan and other postretirement benefit obligations represent the expected benefit payments related to these plans. See Note 9 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 and "Critical Accounting Estimates" contained in this Item 7 for additional information.

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Miscellaneous liabilities include commissions due and accrued, deferred compensation liabilities, state premium taxes payable, amounts due to reinsurance companies, accounts payable, obligations to return unrestricted cash collateral to our derivatives counterparties, commitments to fund tax credit partnership investments, and various other liabilities that represent contractual obligations. Obligations where the timing of the payment was uncertain are included in the one year or less category. See Note 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information on our derivatives.

Off-Balance Sheet Arrangements

Operating leases include noncancelable obligations on certain office space, equipment, and software. Purchase obligations include non-binding commitments of $58.0 million to fund certain of our investments in private placement securities, $158.4 million to fund certain private equity partnerships, and $83.9 million to fund certain commercial mortgage loans. These are shown in the preceding table based on the expiration date of the commitments. The funds will be due upon satisfaction of contractual notice from the partnership trustee, issuer of the private placement securities, or borrower. The amounts may or may not be funded. Also included are obligations with outside parties for computer data processing services, software maintenance agreements, and consulting services. The aggregate obligation remaining under these agreements was $28.3 million at December 31, 2013.

As part of our regular investing strategy, we receive collateral from unaffiliated third parties through transactions which include both securities lending and also short-term agreements to purchase securities with the agreement to resell them at a later specified date. For both types of transactions, we require that a minimum of 102 percent of the fair value of the securities loaned or securities purchased under repurchase agreements be maintained as collateral. Generally, cash is received as collateral under these agreements. In the event that securities are received as collateral, we are not permitted to sell or re-post them. We also post our fixed maturity securities as collateral to unaffiliated third parties through transactions including both securities lending and also short-term agreements to sell securities with the agreement to repurchase them at a later specified date. See "Transfers of Financial Assets" as follows for further discussion.

To help limit the credit exposure of derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held, was $5.5 million at December 31, 2013. We held $1.1 million cash collateral from our counterparties at December 31, 2013. We posted fixed maturity securities with a carrying value of $95.6 million as collateral to our counterparties at December 31, 2013.

See Notes 3 and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information.

Transfers of Financial Assets

Our investment policy permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements, which increase our investment income with minimal risk. We account for all of our securities lending agreements and repurchase agreements as collateralized financings. We had $76.5 million of securities lending agreements outstanding which were collateralized by cash at December 31, 2013 and were reported as short-term debt in our consolidated balance sheets. The cash received as collateral was reinvested in short-term investments. The average balance during the year ended December 31, 2013 was $159.0 million, and the maximum amount outstanding at any month end was $292.3 million. In addition, at December 31, 2013, we had $132.9 million of off-balance sheet securities lending agreements which were collateralized by securities that we were neither permitted to sell nor control. The average balance of these off-balance sheet transactions during the year ended December 31, 2013 was $67.0 million, and the maximum amount outstanding at any month end was $137.7 million.

We had no repurchase agreements outstanding at December 31, 2013. The average balance during the year ended December 31, 2013 was $0.7 million, and the maximum amount outstanding at any month end was $12.8 million. Our use of repurchase agreements and securities lending agreements can fluctuate during any given period and will depend on our liquidity position, the availability of long-term investments that meet our purchasing criteria, and our general business needs.

See Note 3 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for additional information.

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Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $1,031.5 million for 2013, compared to $1,379.6 million and $1,193.7 million for 2012 and 2011, respectively. Operating cash flows are primarily attributable to the receipt of premium and investment income, offset by payments of claims, commissions, expenses, and income taxes. Premium income growth is dependent not only on new sales, but on renewals and growth of existing business, renewal price increases, and persistency. Investment income growth is dependent on the growth in the underlying assets supporting our insurance reserves and capital and on the earned yield. The level of commissions and operating expenses is attributable to the level of sales and the first year acquisition expenses associated with new business as well as the maintenance of existing business. The level of paid claims is affected partially by the growth and aging of the block of business and also by the general economy, as previously discussed in the operating results by segment. Operating cash flows also included contributions of $70.4 million, $74.3 million, and $20.3 million to our defined benefit pension plans and other postretirement benefit plans for 2013, 2012, and 2011, respectively.

The variance in the change in insurance reserves and liabilities and change in income tax adjustments to reconcile net income to net cash provided by operating activities for 2011 compared to 2013 and 2012 was due primarily to the 2011 charges for our long-term care and individual disability closed blocks of business.

Investing Cash Flows

Investing cash inflows consist primarily of the proceeds from the sales and maturities of investments.  Investing cash outflows consist primarily of payments for purchases of investments.  Net cash used by investing activities was $39.9 million for 2013, compared to $1,113.4 million and $410.3 million for 2012 and 2011, respectively. Our investment strategy is to match the cash flows and durations of our assets with the cash flows and durations of our liabilities to meet the funding requirements of our business. Currently, when our fixed maturity securities mature, the proceeds may be reinvested at a yield below that assumed in the pricing of our insurance products. When market opportunities arise, as occurred during the third quarter of 2013, we may sell selected securities and reinvest the proceeds to improve the yield and credit quality of our portfolio. We may at times also sell selected securities and reinvest the proceeds to improve the duration matching of our assets and liabilities and/or re-balance our portfolio. As a result, sales before maturity may vary from period to period. The sale and purchase of short-term investments is influenced by our securities lending program and by the amount of cash which is at times held in short-term investments to facilitate the availability of cash to fund the purchase of appropriate long-term investments and/or to fund our capital deployment program.

See Notes 3 and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further information on our investing cash flows.

Financing Cash Flows

Financing cash flows consist primarily of borrowings and repayments of debt, issuance or repurchase of common stock, and dividends paid to stockholders. Net cash used by financing activities was $974.8 million in 2013, compared to $305.5 million and $720.4 million in 2012 and 2011, respectively.

The balance outstanding under our securities lending program decreased by $379.3 million in 2013 and increased by $143.5 million and $312.3 million in 2012 and 2011, respectively.

During 2013, we purchased and retired the outstanding principal of $62.5 million on our floating rate, senior secured non-recourse notes issued by Tailwind Holdings for $56.2 million and made principal payments of $60.0 million on our senior secured non-recourse notes issued by Northwind Holdings. Aggregate principal payments on the Tailwind Holdings and Northwind Holdings notes were $70.0 million and $84.4 million during 2012 and 2011, respectively. During 2012, we issued $250.0 million of 5.75% senior notes and received proceeds of $246.4 million, excluding the associated debt issuance costs and discounts. During 2011, we made short-term debt repayments of $225.1 million at the maturity date of our senior notes due March 2011.

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Cash used to repurchase shares of Unum Group's common stock during 2013, 2012, and 2011 was $317.2 million, $496.7 million, and $619.9 million, respectively. During 2013, 2012, and 2011, we paid dividends of $146.5 million, $133.8 million, and $121.0 million, respectively, to holders of Unum Group's common stock.

See "Debt" contained in this Item 7, and Notes 8 and 10 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further information on our financing cash flows.

Ratings

AM Best, Fitch, Moody's, and S&P are among the third parties that assign issuer credit ratings to Unum Group and financial strength ratings to our insurance subsidiaries. We compete based in part on the financial strength ratings provided by rating agencies. A downgrade of our financial strength ratings can be expected to adversely affect us and could potentially, among other things, adversely affect our relationships with distributors of our products and services and retention of our sales force, negatively impact persistency and new sales, particularly large case group sales and individual sales, and generally adversely affect our ability to compete. A downgrade in the issuer credit rating assigned to Unum Group can be expected to adversely affect our cost of capital or our ability to raise additional capital.

The table below reflects the issuer credit ratings for Unum Group and the financial strength ratings for each of our traditional insurance subsidiaries as of the date of this filing.

	AM Best	Fitch	Moody's	S&P
Issuer Credit Ratings	bbb (Good)	BBB (Good)	Baa2 (Adequate)	BBB (Adequate)
Financial Strength Ratings
Provident Life and Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Provident Life and Casualty	A (Excellent)	A (Strong)	Not Rated	Not Rated
Unum Life of America	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
First Unum Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Colonial Life & Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Variable	B++ (Good)	A (Strong)	A2 (Good)	Not Rated
Unum Limited	Not Rated	Not Rated	Not Rated	A- (Strong)

We maintain an ongoing dialogue with the four rating agencies that evaluate us in order to inform them of progress we are making regarding our strategic objectives and financial plans as well as other pertinent issues. A significant component of our communications involves our annual review meeting with each of the four agencies. We hold other meetings throughout the year regarding our business, including, but not limited to, quarterly updates.

On January 30, 2013 and again on December 8, 2013, AM Best affirmed its A rating of Unum Group's primary domestic insurance subsidiaries and affirmed the bbb issuer credit rating for Unum Group. AM Best's outlook for all ratings is "stable." On February 11, 2013 and again on September 30, 2013, Fitch affirmed its A rating of Unum Group's domestic insurance subsidiaries and affirmed the senior debt rating of Unum Group at BBB. Fitch's rating outlook for all ratings is "stable." On June 24, 2013, S&P affirmed its A rating of Unum Group's primary domestic insurance subsidiaries and affirmed the BBB counterparty credit rating for Unum Group. S&P's and Moody's outlooks for all ratings are "stable."

There have been no other changes in any of the rating agencies' outlook statements or ratings during 2013 or during 2014 prior to the date of this filing.

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Agency ratings are not directed toward the holders of our securities and are not recommendations to buy, sell, or hold our securities. Each rating is subject to revision or withdrawal at any time by the assigning rating organization, and each rating should be regarded as an independent assessment, not conditional on any other rating. Given the dynamic nature of the ratings process, changes by these or other rating agencies may or may not occur in the near-term. Based on our ongoing dialogue with the rating agencies concerning our improved insurance risk profile, our financial flexibility, our operating performance, and the quality of our investment portfolio, we do not expect any negative actions from any of the four rating agencies related to either Unum Group's current issuer credit ratings or the financial strength ratings of its insurance subsidiaries. However, in the event that we are unable to meet the rating agency specific guideline values to maintain our current ratings, including but not limited to maintenance of our capital management metrics at the threshold values stated and maintenance of our financial flexibility and operational consistency, we could be placed on a negative credit watch, with a potential for a downgrade to both our issuer credit ratings and our financial strength ratings.

See "Ratings" contained herein in Item 1 and "Risk Factors" contained herein in Item 1A for further discussion.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to various market risk exposures, including interest rate risk and foreign exchange rate risk. The following discussion regarding our risk management activities includes forward-looking statements that involve risk and uncertainties. Estimates of future performance and economic conditions are reflected assuming certain changes in market rates and prices were to occur (sensitivity analysis). Caution should be used in evaluating our overall market risk from the information presented below, as actual results may differ. See "Investments" contained herein in Item 7 and Notes 2, 3, and 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 8 for further discussions of the qualitative aspects of market risk, including derivative financial instrument activity.

Interest Rate Risk

Our exposure to interest rate changes results from our holdings of financial instruments such as fixed rate investments, derivatives, and interest-sensitive liabilities. Fixed rate investments include fixed maturity securities, mortgage loans, policy loans, and short-term investments. Fixed maturity securities include U.S. and foreign government bonds, securities issued by government agencies, public utility bonds, corporate bonds, mortgage-backed securities, and redeemable preferred stock, all of which are subject to risk resulting from interest rate fluctuations. Certain of our financial instruments, fixed maturity securities and derivatives, are carried at fair value in our consolidated balance sheets. The fair value of these financial instruments may be adversely affected by changes in interest rates. A rise in interest rates may decrease the net unrealized gain related to these financial instruments, but may improve our ability to earn higher rates of return on new purchases of fixed maturity securities. Conversely, a decline in interest rates may increase the net unrealized gain, but new securities may be purchased at lower rates of return. Although changes in fair value of fixed maturity securities and derivatives due to changes in interest rates may impact amounts reported in our consolidated balance sheets, these changes will not cause an economic gain or loss unless we sell investments, terminate derivative positions, determine that an investment is other than temporarily impaired, or determine that a derivative instrument is no longer an effective hedge.

Other fixed rate investments, such as mortgage loans and policy loans, are carried at amortized cost and unpaid balances, respectively, rather than fair value in our consolidated balance sheets. These investments may have fair values substantially higher or lower than the carrying values reflected in our balance sheets. A change in interest rates could impact our financial position if we sold our mortgage loan investments at times of low market value. A change in interest rates would not impact our financial position at repayment of policy loans, as ultimately the cash surrender values or death benefits would be reduced for the carrying value of any outstanding policy loans. Carrying amounts for short-term investments approximate fair value, and we believe we have minimal interest rate risk exposure from these investments.

We believe that the risk of being forced to liquidate investments or terminate derivative positions is minimal, primarily due to the level of capital at our insurance subsidiaries, the level of cash and marketable securities at our holding companies, and our investment strategy which we believe provides for adequate cash flows to meet the funding requirements of our business. We may in certain circumstances, however, need to sell investments due to changes in regulatory or capital requirements, changes in tax laws, rating agency decisions, and/or unexpected changes in liquidity needs.

Although our policy benefits are primarily in the form of claim payments and we therefore have minimal exposure to the policy withdrawal risk associated with deposit products such as individual life policies or annuities, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which minimizes exposure to changing interest rates through the matching of investment cash flows with amounts due under insurance contracts. Changes in interest rates and individuals' behavior affect the amount and timing of asset and liability cash flows. We actively manage our asset and liability cash flow match and our asset and liability duration match to limit interest rate risk. Due to the long duration of our long-term care product, the timing and/or amount of our investment cash flows may not match those of our maturing liabilities.  We model and test asset and liability portfolios to improve interest rate risk management and net yields. Testing the asset and liability portfolios under various interest rate and economic scenarios enables us to choose what we believe to be the most appropriate investment strategy, as well as to limit the risk of disadvantageous outcomes. We use this analysis in determining hedging strategies and utilizing derivative financial instruments. We use current and forward interest rate swaps, options on forward interest rate swaps, and forward treasury locks to hedge interest rate risks and to match asset durations and cash flows with corresponding liabilities.

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Long-term debt is not carried at fair value in our consolidated balance sheets. If we modify or replace existing long-term debt instruments at current market rates, we may incur a gain or loss on the transaction. We believe our debt-related risk to changes in interest rates is relatively minimal. In the near term, we expect that our need for external financing is small, but changes in our business could increase our need.

We measure our financial instruments' market risk related to changes in interest rates using a sensitivity analysis. This analysis estimates potential changes in fair values as of December 31, 2013 and 2012 based on a hypothetical immediate increase of 100 basis points in interest rates from year end levels. The selection of a 100 basis point immediate parallel change in interest rates should not be construed as our prediction of future market events, but only as an illustration of the potential effect of such an event.

The hypothetical potential changes in fair value of our financial instruments at December 31, 2013 and 2012 are shown as follows:

	December 31, 2013
(in millions of dollars)	Notional Amount of Derivatives		Fair Value			Hypothetical
						FV + 100 BP			Change in FV
Assets
Fixed Maturity Securities (1)			$	42,344.4		$	39,009.2		$	(3,335.2	)
Mortgage Loans			1,980.2			1,889.9			(90.3		)
Policy Loans, Net of Reinsurance Ceded			295.9			278.0			(17.9		)
Liabilities
Unrealized Adjustment to Reserves, Net of Reinsurance Ceded and Deferred Acquisition Costs (2)			$	(3,886.3	)	$	(1,568.7	)	$	2,317.6
Long-term Debt			(2,824.4		)	(2,660.5		)	163.9
Derivatives(1)
Swaps	$	1,477.4	$	(124.8	)	$	(139.7	)	$	(14.9	)
Embedded Derivative in Modified Coinsurance Arrangement			(53.2		)	(62.1		)	(8.9		)

	December 31, 2012
(in millions of dollars)	Notional Amount of Derivatives		Fair Value			Hypothetical
						FV + 100 BP			Change in FV
Assets
Fixed Maturity Securities (1)			$	44,973.0		$	41,290.1		$	(3,682.9	)
Mortgage Loans			1,937.1			1,847.2			(89.9		)
Policy Loans, Net of Reinsurance Ceded			302.6			283.5			(19.1		)
Liabilities
Unrealized Adjustment to Reserves, Net of Reinsurance Ceded and Deferred Acquisition Costs (2)			$	(5,993.0	)	$	(3,267.5	)	$	2,725.5
Long-term Debt			(2,968.8		)	(2,780.3		)	188.5
Derivatives(1)
Swaps	$	1,432.8	$	(88.9	)	$	(146.4	)	$	(57.5	)
Embedded Derivative in Modified Coinsurance Arrangement			(83.9		)	(92.3		)	(8.4		)

(1) These financial instruments are carried at fair value in our consolidated balance sheets. Changes in fair value resulting from changes in interest rates may affect the fair value at which the item is reported in our consolidated balance sheets. The corresponding offsetting change is reported in other comprehensive income or loss, net of deferred taxes, except for changes in the fair value of derivatives accounted for as fair value hedges or derivatives not designated as hedging instruments, the offset of which is reported as a component of net realized investment gain or loss.

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(2) The adjustment to reserves and deferred acquisition costs for unrealized investment gains and losses reflects the adjustments to policyholder liabilities and deferred acquisition costs that would be necessary if the unrealized investment gains and losses related to the fixed maturity securities and derivatives had been realized. Changes in this adjustment are also reported as a component of other comprehensive income or loss, net of deferred taxes.

The effect of a change in interest rates on asset prices was determined using a duration implied methodology for corporate bonds and government and government agency securities whereby the duration of each security was used to estimate the change in price for the security assuming an increase of 100 basis points in interest rates. The effect of a change in interest rates on the mortgage-backed securities was estimated using a mortgage analytic system which takes into account the impact of changing prepayment speeds resulting from a 100 basis point increase in interest rates on the change in price of the mortgage-backed securities. These hypothetical prices were compared to the actual prices for the period to compute the overall change in market value. The changes in the fair values shown in the chart above for all other items were determined using discounted cash flows analyses. Because we actively manage our investments and liabilities, actual changes could be less than those estimated above.

Sustained periods of low interest rates may result in lower than expected profitability. Assuming December 31, 2013 interest rates and credit spreads remained constant through 2015, our net investment income would decrease by approximately $0.5 million in 2014 and $6.5 million in 2015 relative to our current expectations. This interest rate scenario does not give consideration to the effect of other factors which could impact these results, such as changes in the bond market and changes in hedging strategies and positions, nor does it consider the potential change to our discount rate reserve assumption and any mitigating factors such as pricing adjustments. In addition, a continued low interest rate environment may also result in an increase in the net periodic benefit costs for our pension plans, but we do not believe it would materially affect net income in 2014 or 2015.

Foreign Currency Risk

The functional currency of our U.K. operations is the British pound sterling. We are exposed to foreign currency risk arising from fluctuations in the British pound sterling to U.S. dollar exchange rates primarily as they relate to the translation of the financial results of our U.K. operations. Fluctuations in the pound to dollar exchange rate have an effect on our reported financial results. We do not hedge against the possible impact of this risk. Because we do not actually convert pounds into dollars except for a limited number of transactions, we view foreign currency translation as a financial reporting issue and not a reflection of operations or profitability in our U.K. operations.

Assuming the pound to dollar exchange rate decreased 10 percent from the December 31, 2013 and 2012 levels, stockholders' equity as reported in U.S. dollars as of and for the periods then ended would have been lower by approximately $102.1 million and $109.5 million, respectively. Assuming the pound to dollar average exchange rate decreased 10 percent from the actual average exchange rates for 2013 and 2012, before-tax operating income, as reported in U.S. dollars would have decreased approximately $14.3 million and $12.6 million, respectively, for the years then ended.

Dividends paid by Unum Limited are generally held at our U.K. finance subsidiary or our U.K. holding company. If these funds are repatriated to our U.S. holding company, we would at that time be subject to foreign currency risk as the value of the dividend, when converted into U.S. dollars, would be dependent upon the foreign exchange rate at the time of conversion.

We are also exposed to foreign currency risk related to certain foreign investment securities denominated in local currencies and U.S. dollar-denominated debt issued by one of our U.K. subsidiaries. We use current and forward currency swaps to hedge or minimize the foreign exchange risk associated with these instruments.

See "Consolidated Operating Results" and "Unum UK Segment" contained herein in Item 7 for further information concerning foreign currency translation.

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Risk Management

Effectively taking and managing risks is essential to the success of our Company. To facilitate this effort, we have a formal Enterprise Risk Management (ERM) program, with a framework comprising the following key components:

• Risk culture and governance

• Risk appetite policy

• Risk identification and prioritization

• Risk and capital modeling

• Risk management activities

• Risk reporting

Our ERM framework is the ongoing system of people, processes, and tools across our Company under which we intend to function consistently and collectively to identify and assess risks and opportunities, to manage all material risks within our risk appetite, and to contribute to strategic decision making. With the goal of maximizing shareholder value, the primary objectives of our ERM framework are to support Unum Group in meeting its operational and financial objectives, maintaining liquidity, preserving capital adequacy, and protecting franchise value.

Risk Culture and Governance

We employ a decentralized risk management model under which risk-based decisions are made daily on a local level. To achieve long-term success, we believe risk management must be the responsibility of all employees. The individual and collective decisions of our employees play a key role in successfully managing our overall risk profile. We strive for a culture of accountability, risk management, and strict compliance, and we believe these values allow our employees to feel comfortable identifying issues as well as taking ownership for addressing potential problems.

Our risk culture is reinforced by our system of risk governance. We employ a multi-layered risk control system. Our three lines of defense model is depicted below.

1st Line: Own and Manage	2nd Line: Oversee	3rd Line: Independent Assurance
Business processes and procedures employed throughout the Company through which management assumes and monitors significant risks	Management committees chartered with oversight of activities within the 1st and 2nd lines of defense, mitigation of substantial exposures, and management of emerging risks	Independent review of ERM framework and risk mitigation

Business units are primarily responsible for managing their principal risks. Our risk committees and other management committees serve risk and control functions responsible for providing risk oversight, or the second line of risk control. The internal audit team provides a second level of independent review, or our third line of risk control. The audit committee of Unum Group's board of directors (the board) oversees the entire ERM governance process, effectively providing independent review for our third line of risk control.

The board has an active role, as a whole and through its committees, in overseeing management of our risks. The board is responsible for managing strategic risk and regularly reviews information regarding our capital, liquidity, and operations, as well as the risks associated with each. The audit committee of the board is responsible for oversight of our risk management process, including financial risk, operational risk, and any other risk not specifically assigned to another board committee. The chief risk officer (CRO) provides a report on our risks and risk management processes to the audit committee of the board at least quarterly. The finance committee of the board is responsible for oversight of risks associated with investments, capital and financing plans and activities, and related financial matters, including matters pertaining to our Closed Block segment. The human capital committee of the board is responsible for oversight of risks relating to our compensation plans and programs. The CRO performs an annual risk assessment of our incentive compensation programs to ensure incentive plans are balanced and consistent with the risk levels embedded in our financial and business plans. Results of this assessment are presented to our human capital committee of the board annually, and conclusions from this assessment are reported in our proxy statement. The regulatory compliance committee of the board is responsible for oversight of risks related to regulatory, compliance, policy, and legal matters, both current and emerging, and whether of a local, state, federal, or international nature. While each committee is responsible for evaluating certain risks and overseeing the management of such risks, the entire board is regularly informed through committee reports about such risks in addition to the risk information it receives directly.

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The executive risk management committee is responsible for overseeing our enterprise-wide risk management program. The CRO, who is a member of the executive risk management committee, has primary responsibility for our ERM program and is supported by corporate risk committees and by the risk committees of our primary operating segments.

Operating segment risk committees for Unum US, Unum UK, Colonial Life, and Closed Block are responsible for oversight of risks specific to their businesses. These committees are responsible for identifying, measuring, reporting, and managing insurance and operational risks within their respective areas, consistent with enterprise risk management guidance. Corporate risk committees and other management committees oversee the operational, global technology services, investment, and capital management risks on a corporate level.

Risk Appetite Policy

Our risk appetite policy describes the types of risks we are willing to take, as well as the amount of enterprise risk exposure we deem acceptable in pursuit of our goals, with an objective of clearly defining boundaries for our risk-taking activities.

The starting point of our philosophy and approach to our ERM strategyis our corporate strategy. In contrast to many multi-line peer companies, we do not offer retirement savings, traditional medical benefits, or property and casualty insurance. Our corporate strategy is focused on providing group, individual, and voluntary benefits, either as stand-alone products or combined with other coverages, that create comprehensive benefits solutions for employers. We have market leadership positions in the product lines we offer and believe this combination of focused expertise and experience is a competitive advantage and forms the foundation of our approach to risk management.

We believe our sound and consistent business practices, strong internal compliance program, and comprehensive risk management strategy enable us to operate efficiently and to identify and address potential areas of risk in our business. We take and manage risks to achieve our business and strategic objectives, and our risk appetite statement sets boundaries for risk-taking activities that link earnings, capital, and operational processes, as well as summarizes our most material risk limits and controls. We monitor our risk profile against our established risk tolerance and limits. Risks falling outside our risk tolerance and limits are reported to the applicable governance group, where decisions are made pertaining to acceptance of the risk or implementation of remediation plans or corrective actions as deemed appropriate by that governance group.

Risk Identification and Prioritization

Risk identification and prioritization is an ongoing process, whereby we identify and assess our risk positions and exposures, including notable risk events. Additionally, we identify emerging risks and analyze how material future risks might affect us. Knowing the potential risks we face allows us to monitor and manage their potential effects including adjusting our strategies as appropriate and holding capital levels which provide financial flexibility.

Risk committees have primary responsibility for identifying and prioritizing risks within their respective areas. In addition, we maintain a risk, ethics, and compliance (REC) leaders program. The goal of the program is to further embed REC management into our culture in a visible and effective manner. This group assists with the early identification of issues, timely referrals, problem solving, and communication.

Individual employees can report material concerns and identified risks through a variety of options, such as discussion with management, contacting a REC leader or the ERM team, or utilizing the Company's anonymous hotline and electronic reporting mechanism.

We face a wide range of risks, and our continued success depends on our ability to identify and appropriately manage our risk exposures. For additional information on certain risks that may adversely affect our business, operating results, or financial condition see "Cautionary Statement Regarding Forward-Looking Statements" contained herein on page 1 and "Risk Factors" contained herein in Item 1A.

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Risk and Capital Modeling

We assess material risks, including how they affect us and how individual risks interrelate, to provide valuable information to management in order that they may effectively manage our risks. We use qualitative and quantitative approaches to assess existing and emerging risks and to develop mitigating strategies to limit our exposure to both.

We utilize stress testing and scenario analysis for risk management and to shape our business, financial, and strategic planning activities. Both are key components of our risk appetite policy and play an important role in monitoring, assessing, managing, and mitigating our primary risk exposures.

In particular, stress testing of our capital and liquidity management strategies enables us to identify areas of high exposure, assess mitigating actions, develop contingency plans, and guide decisions around our target capital and liquidity levels. For example, we periodically perform stress tests on certain categories of assets or liabilities to support development of capital and liquidity risk contingency plans. These tests help ensure that we have a buffer to support our operations in uncertain times and financial flexibility to respond to market opportunities. Stress testing is also central to reserve adequacy testing, cash flow testing, and asset and liability management.

In addition, we aim to constantly improve our capital modeling techniques and methodologies that are used to determine a level of capital that is commensurate with our risk profile and to ensure compliance with evolving regulatory and rating agency requirements. Our capital modeling reflects appropriate aggregation of risks and diversification benefits resulting from our mix of products and business units.

Our internal capital modeling and allocation aids us in making significant business decisions including strategic planning, capital management, risk limit determination, reinsurance purchases, hedging activities, asset allocation, pricing, and corporate development.

Risk Management Activities

We accept and manage strategic, credit, and insurance risks in accordance with our corporate strategy, investment policy, and annual business plans. The following fundamental principles are embedded in our risk management efforts across our Company.

• We believe in the benefits of specialization and a focused business strategy. We seek profitable risk-taking in areas where we have established risk management skills and capabilities.

• We seek to manage our exposure to insurance risk through a combination of prudent underwriting with effective risk selection, maintaining pricing discipline, sound reserving practices, and claims operational effectiveness. Detailed underwriting guidelines and claim policies are tools used to manage our insurance risk exposure. We also monitor exposures against internally prescribed limits, and we diversify to reduce potential concentration risk and volatility.

• We maintain a detailed set of investment policies and guidelines, including fundamental credit analysis, that are used to manage our credit risk exposure and diversify our risks across asset classes and issuers.

• Finally, we foster a risk culture that embeds our corporate values and our code of conduct in our daily operations and preserves our reputation with customers and other key stakeholders. We monitor a composite set of operational risk metrics that measure operating effectiveness from the customer perspective.

Risk Reporting

Regular internal and external risk reporting is an integral part of our ERM framework. Internally, ERM reports are a standard part of our quarterly senior management and board meetings. The reports summarize our existing and emerging risk exposures, as well as report against the tolerances and limits defined by our risk appetite policy. 

Externally, we are subject to a number of regulatory and rating agency risk examinations, and risk reports are often included. By 2015, we must comply with the ORSA requirements, which are intended to become a regular part of reviews of insurers' ERM programs. We believe the ORSA will provide strong evidence of the strengths of our ERM framework, measurement approaches, key assumptions utilized in assessing our risks, and prospective solvency assessments under both normal and stressed conditions. We have implemented, and will continue to implement, actions to prepare for compliance with this evolving standard. See "Regulation" contained herein in Item 1 for additional information regarding the ORSA.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders

Unum Group

We have audited the accompanying consolidated balance sheets of Unum Group and subsidiaries as of December 31, 2013 and 2012, and the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2013. Our audits also included the financial statement schedules listed in the Index at Item 15(a)(2).  These financial statements and schedules are the responsibility of the Company's management.  Our responsibility is to express an opinion on these financial statements and schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Unum Group and subsidiaries at December 31, 2013 and 2012, and the consolidated results of their operations and their cash flows for each of the three years in the period ended December 31, 2013, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the related financial statement schedules, when considered in relation to the basic financial statements taken as a whole, present fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Unum Group and subsidiaries' internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework), and our report dated February 26, 2014 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Chattanooga, Tennessee

February 26, 2014

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CONSOLIDATED BALANCE SHEETS

Unum Group and Subsidiaries

	December 31
	2013		2012
	(in millions of dollars)
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $38,289.6; $37,751.5)	$	42,344.4	$	44,973.0
Mortgage Loans	1,815.1		1,712.7
Policy Loans	3,276.0		3,133.8
Other Long-term Investments	566.0		625.0
Short-term Investments	913.4		1,460.3
Total Investments	48,914.9		51,904.8
Other Assets
Cash and Bank Deposits	94.1		77.3
Accounts and Premiums Receivable	1,647.8		1,632.6
Reinsurance Recoverable	4,806.5		4,842.6
Accrued Investment Income	700.2		694.6
Deferred Acquisition Costs	1,829.2		1,755.5
Goodwill	200.9		201.7
Property and Equipment	511.9		501.6
Income Tax Receivable	50.3		—
Other Assets	647.8		625.4
Total Assets	$	59,403.6	$	62,236.1

See notes to consolidated financial statements.

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CONSOLIDATED BALANCE SHEETS - Continued

Unum Group and Subsidiaries

	December 31
	2013			2012
	(in millions of dollars)
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits	$	1,511.0		$	1,484.6
Reserves for Future Policy and Contract Benefits	43,099.1			44,694.4
Unearned Premiums	413.8			426.7
Other Policyholders’ Funds	1,658.4			1,644.9
Income Tax Payable	—			54.2
Deferred Income Tax	144.3			269.4
Short-term Debt	76.5			455.8
Long-term Debt	2,612.0			2,755.4
Other Liabilities	1,229.4			1,838.1
Total Liabilities	50,744.5			53,623.5
Commitments and Contingent Liabilities - Note 14
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 360,802,426 and 359,751,943 shares	36.1			36.0
Additional Paid-in Capital	2,634.1			2,607.7
Accumulated Other Comprehensive Income	255.0			628.0
Retained Earnings	8,083.2			7,371.6
Treasury Stock - at cost: 100,785,012 and 89,546,758 shares	(2,349.3		)	(2,030.7		)
Total Stockholders' Equity	8,659.1			8,612.6
Total Liabilities and Stockholders' Equity	$	59,403.6		$	62,236.1

See notes to consolidated financial statements.

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CONSOLIDATED STATEMENTS OF INCOME

Unum Group and Subsidiaries

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars, except share data)
Revenue
Premium Income	$	7,624.7		$	7,716.1		$	7,514.2
Net Investment Income	2,492.1			2,515.2			2,519.6
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(0.8		)	—			(19.9		)
Other Net Realized Investment Gain	7.6			56.2			15.0
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Other Income	230.2			227.9			249.1
Total Revenue	10,353.8			10,515.4			10,278.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	6,595.7			6,722.2			7,209.5
Commissions	909.5			917.2			879.2
Interest and Debt Expense	149.4			145.4			143.3
Deferral of Acquisition Costs	(466.8		)	(467.3		)	(442.5		)
Amortization of Deferred Acquisition Costs	418.9			378.7			365.7
Impairment of Deferred Acquisition Costs	—			—			196.0
Compensation Expense	790.4			786.8			808.0
Other Expenses	751.5			782.9			785.5
Total Benefits and Expenses	9,148.6			9,265.9			9,944.7
Income Before Income Tax	1,205.2			1,249.5			333.3
Income Tax (Benefit)
Current	296.6			206.6			230.5
Deferred	50.5			148.5			(181.4		)
Total Income Tax	347.1			355.1			49.1
Net Income	$	858.1		$	894.4		$	284.2
Net Income Per Common Share
Basic	$	3.24		$	3.18		$	0.94
Assuming Dilution	$	3.23		$	3.17		$	0.94

See notes to consolidated financial statements.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Unum Group and Subsidiaries

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Net Income	$	858.1		$	894.4		$	284.2
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(1,102.8); $467.7; $798.3)	(2,101.2		)	918.8			1,519.8
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $743.3; $(325.6); $(701.5))	1,363.4			(660.1		)	(1,321.1		)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(1.3); $(4.3); $25.2)	(5.3		)	(7.1		)	47.7
Change in Foreign Currency Translation Adjustment	25.5			45.0			(10.5		)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $185.2; $(68.0); $(67.4))	344.6			(130.4		)	(125.5		)
Total Other Comprehensive Income (Loss)	(373.0		)	166.2			110.4
Comprehensive Income	$	485.1		$	1,060.6		$	394.6

See notes to consolidated financial statements.

99

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

Unum Group and Subsidiaries

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Common Stock
Balance at Beginning of Year	$	36.0		$	35.9		$	36.5
Common Stock Activity	0.1			0.1			0.2
Retirement of Repurchased Common Shares	—			—			(0.8		)
Balance at End of Year	36.1			36.0			35.9
Additional Paid-in Capital
Balance at Beginning of Year	2,607.7			2,591.1			2,615.4
Common Stock Activity	26.4			16.6			30.9
Retirement of Repurchased Common Shares	—			—			(55.2		)
Balance at End of Year	2,634.1			2,607.7			2,591.1
Accumulated Other Comprehensive Income
Balance at Beginning of Year	628.0			461.8			351.4
Other Comprehensive Income (Loss)	(373.0		)	166.2			110.4
Balance at End of Year	255.0			628.0			461.8
Retained Earnings
Balance at Beginning of Year	7,371.6			6,611.0			6,591.8
Net Income	858.1			894.4			284.2
Dividends to Stockholders (per common share: $0.550; $0.470; $0.395)	(146.5		)	(133.8		)	(121.0		)
Retirement of Repurchased Common Shares	—			—			(144.0		)
Balance at End of Year	8,083.2			7,371.6			6,611.0
Treasury Stock
Balance at Beginning of Year	(2,030.7		)	(1,530.1		)	(1,110.2		)
Purchases of Treasury Stock	(318.6		)	(500.6		)	(419.9		)
Balance at End of Year	(2,349.3		)	(2,030.7		)	(1,530.1		)
Total Stockholders' Equity at End of Year	$	8,659.1		$	8,612.6		$	8,169.7

See notes to consolidated financial statements.

100

CONSOLIDATED STATEMENTS OF CASH FLOWS

Unum Group and Subsidiaries

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Flows from Operating Activities
Net Income	$	858.1		$	894.4		$	284.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(196.7		)	40.4			37.0
Change in Deferred Acquisition Costs	(47.9		)	(88.6		)	(76.8		)
Impairment of Deferred Acquisition Costs	—			—			196.0
Change in Insurance Reserves and Liabilities	572.5			508.4			1,113.9
Change in Income Taxes	(49.4		)	168.0			(274.4		)
Change in Other Accrued Liabilities	21.2			18.6			68.4
Non-cash Adjustments to Net Investment Income	(211.5		)	(221.3		)	(240.6		)
Net Realized Investment (Gain) Loss	(6.8		)	(56.2		)	4.9
Depreciation	84.8			84.3			81.1
Other, Net	7.2			31.6			—
Net Cash Provided by Operating Activities	1,031.5			1,379.6			1,193.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	1,040.5			595.9			1,181.9
Proceeds from Maturities of Fixed Maturity Securities	2,146.4			2,160.5			1,692.7
Proceeds from Sales and Maturities of Other Investments	243.4			182.2			131.9
Purchase of Fixed Maturity Securities	(3,553.6		)	(3,512.8		)	(2,760.1		)
Purchase of Other Investments	(363.7		)	(353.8		)	(304.1		)
Net Sales (Purchases) of Short-term Investments	552.4			(80.1		)	(254.6		)
Net Purchases of Property and Equipment	(105.5		)	(105.4		)	(98.2		)
Other, Net	0.2			0.1			0.2
Net Cash Used by Investing Activities	(39.9		)	(1,113.4		)	(410.3		)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(379.3		)	143.5			87.2
Issuance of Long-term Debt	—			246.4			—
Long-term Debt Repayments	(116.2		)	(70.0		)	(84.4		)
Issuance of Common Stock	11.4			4.9			14.8
Repurchase of Common Stock	(317.2		)	(496.7		)	(619.9		)
Dividends Paid to Stockholders	(146.5		)	(133.8		)	(121.0		)
Other, Net	(27.0		)	0.2			2.9
Net Cash Used by Financing Activities	(974.8		)	(305.5		)	(720.4		)
Net Increase (Decrease) in Cash and Bank Deposits	16.8			(39.3		)	63.0
Cash and Bank Deposits at Beginning of Year	77.3			116.6			53.6
Cash and Bank Deposits at End of Year	$	94.1		$	77.3		$	116.6

See notes to consolidated financial statements.

101

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies

Basis of Presentation: The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). Such accounting principles differ from statutory accounting principles (see Note 15). Intercompany transactions have been eliminated.

Description of Business: We are the largest provider of group and individual disability products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including life insurance, employer- and employee-paid group benefits, and other related services. We market our products primarily to employers interested in providing benefits to their employees.

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other reporting segments are Closed Block and Corporate. See Note 13 for further discussion of our operating segments.

Use of Estimates: The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.

Fixed Maturity Securities: Fixed maturity securities include long-term bonds and redeemable preferred stocks. Fixed maturity securities not bought and held for the purpose of selling in the near term but for which we do not have the positive intent and ability to hold to maturity are classified as available-for-sale and reported at fair value. Changes in the fair value of available-for-sale fixed maturity securities, except for amounts related to other-than-temporary impairment losses recognized in earnings, are reported as a component of other comprehensive income. These amounts are net of income tax and valuation adjustments to deferred acquisition costs and reserves for future policy and contract benefits which would have been recorded had the related unrealized gain or loss on these securities been realized.

Interest income is recorded as part of net investment income when earned, using an effective yield method giving effect to amortization of premium and accretion of discount. Included within fixed maturity securities are mortgage-backed and asset-backed securities.  We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income. For fixed maturity securities on which collection of investment income is uncertain, we discontinue the accrual of investment income and recognize investment income when interest and dividends are received. Payment terms specified for fixed maturity securities may include a prepayment penalty for unscheduled payoff of the investment.  Prepayment penalties are recognized as investment income when received.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate available information, both positive and negative, in reaching our conclusions. In particular, we consider the strength of the issuer's balance sheet, its debt obligations and near-term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and the present value of our best estimate

102

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income. See Notes 2 and 3.

Mortgage Loans: Mortgage loans are generally held for investment and are carried at amortized cost less an allowance for probable losses. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Prepayment penalties are recognized as investment income when received. For mortgage loans on which collection of interest income is uncertain, we discontinue the accrual of interest and recognize it in the period when an interest payment is received. We typically do not resume the accrual of interest on mortgage loans on nonaccrual status until there are significant improvements in the underlying financial condition of the borrower. We consider a loan to be delinquent if full payment is not received in accordance with the contractual terms of the loan.

We evaluate each of our mortgage loans individually for impairment based on a comprehensive rating system used to evaluate the credit risk of the loan. Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining impairment. If we determine that it is probable we will be unable to collect all amounts due under the contractual terms of a mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. We do not purchase mortgage loans with existing credit impairments. See Note 3.

Policy Loans:Policy loansare presented at unpaid balances directly related to policyholders. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Included in policy loans are $3,043.7 million and $2,912.7 million of policy loans ceded to reinsurers at December 31, 2013 and 2012, respectively.

Other Long-term Investments:Other long-term investments are comprised primarily of tax credit partnerships and private equity partnerships.

Tax credit partnerships in which we have invested were formed for the purpose of investing in the construction and rehabilitation of low-income housing.  Because the partnerships are structured such that there is no return of principal, the primary sources of investment return from our tax credit partnerships are tax credits and tax benefits derived from passive losses on the investments, both of which may exhibit variability over the life of the investment.  These partnerships are accounted for using either the equity or the effective yield method, depending primarily on whether the tax credits are guaranteed through a letter of credit, a tax indemnity agreement, or another similar arrangement. Tax credits received from these partnerships are reported in our consolidated statements of income as either a reduction of state premium taxes, which are a component of other expenses, or a reduction of income tax. For those partnerships accounted for under the equity method, the amortization of the principal amount invested in these partnerships is reported as a component of net investment income. For those partnerships accounted for under the effective yield method, amortization of the principal amount invested is reported as a component of income tax or other expenses.

Our investments in private equity partnerships are passive in nature.  The underlying investments held by these partnerships include both equity and debt securities and are accounted for using the equity or cost method, depending on the level of ownership and the degree of our influence over partnership operating and financial policies. For partnerships accounted for under the equity method, our portion of partnership earnings is reported as a component of net investment income in our consolidated statements of income. For those partnerships accounted for under the cost method, we record income received from partnership distributions as either a component of net investment income or net realized investment gain or loss, in accordance with the source of the funds distributed from the partnership. See Notes 2 and 3.

Short-term Investments:Short-term investments are carried at cost. Short-term investments include investments maturing within one year, such as corporate commercial paper and U.S. Treasury bills, bank term deposits, and other cash accounts and cash equivalents earning interest. See Note 2.

103

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Cash and Bank Deposits: Cash and bank deposits include cash on hand and non-interest bearing cash and deposit accounts.

Derivative Financial Instruments: Derivative financial instruments (including certain derivative instruments embedded in other contracts) are recognized as either other long-term investments or other liabilities in our consolidated balance sheets and are reported at fair value. The accounting for a derivative depends on whether it has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. To qualify for hedge accounting, at the inception of the hedging transaction, we formally document the risk management objective and strategy for undertaking the hedging transaction, as well as the designation of the hedge as either a fair value hedge or a cash flow hedge. Included in this documentation is how the hedging instrument is expected to hedge the designated risk(s) related to specific assets or liabilities on the balance sheet or to specific forecasted transactions as well as a description of the method that will be used to retrospectively and prospectively assess the hedging instrument's effectiveness and the method that will be used to measure ineffectiveness.

A derivative designated as a hedging instrument must be assessed as being highly effective in offsetting the designated risk(s) of the hedged item. Hedge effectiveness is formally assessed at inception and periodically throughout the life of the designated hedging relationship, using qualitative and quantitative methods. Qualitative methods include comparison of critical terms of the derivative to the hedged item. Quantitative methods include regression or other statistical analysis of changes in fair value or cash flows associated with the hedge relationship.

Changes in the fair value of a derivative designated as a fair value hedge, including amounts measured as ineffectiveness, and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.  The gain or loss on the termination of a fair value hedge is recognized in earnings as a component of net realized investment gain or loss during the period in which the termination occurs. When interest rate swaps are used in hedge accounting relationships, periodic settlements are recorded in the same income statement line as the related settlements of the hedged items.

To the extent it is effective, changes in the fair value of a derivative designated as a cash flow hedge are reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings. The ineffective portion of the hedge, if any, is recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. The gain or loss on the termination of an effective cash flow hedge is reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings.

Gains or losses on the termination of ineffective fair value or cash flow hedges are reported in earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of or the anticipated transaction being hedged is no longer likely to occur, we will terminate the related derivative and recognize the gain or loss on termination in current earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of subsequent to the termination of the hedging transaction, we reclassify any remaining gain or loss on the cash flow hedge out of accumulated other comprehensive income into earnings as a component of the same income statement line item wherein we report the gain or loss on disposition of the hedged item.

For a derivative not designated as a hedging instrument, changes in the fair value of the derivative, together with the payment of periodic fees, if applicable, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

Cash flow activity from the settlement of derivative contracts is reported in the consolidated statements of cash flows as a component of proceeds from sales and maturities of other investments.

In our consolidated balance sheets, we do not offset fair value amounts recognized for derivatives executed with the same counterparty under a master netting agreement and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from those master netting agreements. See Notes 2 and 4.

104

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Fair Value Measurement: Certain assets and liabilities are reported at fair value in our consolidated balance sheets and in our notes to our consolidated financial statements. We define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value represents an exit price, not an entry price. The exit price objective applies regardless of our intent and/or ability to sell the asset or transfer the liability at the measurement date. Assets or liabilities with readily available actively quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. When actively quoted prices are not available, fair values are based on quoted prices in markets that are not active, quoted prices for similar but not identical assets or liabilities, or other observable inputs. If observable inputs are not available, unobservable inputs and/or adjustments to observable inputs requiring management judgment are used to determine fair value. We categorize our assets and liabilities measured at estimated fair value into a three-level hierarchy, based on the significance of the inputs. The fair value hierarchy gives the highest priority to inputs which are unadjusted and represent quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). See Note 2.

Realized Investment Gains and Losses: Realized investment gains and losses are reported as a component of revenue in the consolidated statements of income and are based upon specific identification of the investments sold. See Note 3.

Deferred Acquisition Costs: Incremental direct costs associated with the successful acquisition of new or renewal insurance contracts have been deferred. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral. Deferred acquisition costs are subject to recoverability testing at the time of policy issue and loss recognition testing in subsequent years.

Deferred acquisition costs related to traditional policies are amortized over the premium paying period of the related policies in proportion to the ratio of the present value of annual expected premium income to the present value of total expected premium income. Deferred acquisition costs related to interest-sensitive policies are amortized over the lives of the policies in relation to the present value of estimated gross profits from surrender charges, mortality margins, investment returns, and expense margins. Deviations from projections result in a change to the rate of amortization in the period during which such events occur. Generally, the amortization periods for these policies approximate the estimated lives of the policies.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. Unamortized deferred acquisition costs from the original policy continue to be amortized over the expected life of the new policy, and the costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions, principally on group contracts, that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. Unamortized deferred acquisition costs on the original policy that was replaced are immediately expensed, and the costs of acquiring the new policy are capitalized and amortized in accordance with our accounting policies for deferred acquisition costs.

Loss recognition is performed on an annual basis, or more frequently if appropriate, using best estimate assumptions as to future experience as of the date of the test. Insurance contracts are grouped for each major product line within a segment when we perform the loss recognition tests. If loss recognition testing indicates that deferred acquisition costs are not recoverable, the deficiency is charged to expense.

105

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Goodwill: Goodwill is the excess of the amount paid to acquire a business over the fair value of the net assets acquired. We review the carrying amount of goodwill for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the carrying amount might not be recoverable. Goodwill impairment testing compares the fair value of a reporting unit with its carrying amount, including goodwill.  The fair values of the reporting units are determined using discounted cash flow models.  The critical estimates necessary in determining fair value are projected earnings and the discount rate.  We set our discount rate assumption based on an expected risk adjusted cost of capital.  If the fair value of the reporting unit to which the goodwill relates is less than the carrying amount of the unamortized goodwill, the carrying amount is reduced with a corresponding charge to expense. 

Property and Equipment: Property and equipment is reported at cost less accumulated depreciation, which is calculated on the straight-line method over the estimated useful life. The accumulated depreciation for property and equipment was $760.8 million and $705.0 million as of December 31, 2013 and 2012, respectively.

Value of Business Acquired: Value of business acquired represents the present value of future profits recorded in connection with the acquisition of a block of insurance policies. The asset is amortized based upon expected future premium income for traditional insurance policies and estimated future gross profits from surrender charges, mortality margins, investment returns, and expense margins for interest-sensitive insurance policies. The value of business acquired, which is included in other assets in our consolidated balance sheets, was $19.0 million and $23.5 million at December 31, 2013 and 2012, respectively. The accumulated amortization for value of business acquired was $138.2 million and $131.5 million as of December 31, 2013 and 2012, respectively.

The amortization of value of business acquired, which is included in other expenses in the consolidated statements of income, was $4.5 million, $7.5 million, and $7.4 million for the years ended December 31, 2013, 2012, and 2011, respectively. We periodically review the carrying amount of value of business acquired using the same methods used to evaluate deferred acquisition costs.

Policy and Contract Benefits: Policy and contract benefits represent amounts paid and expected to be paid based on reported losses and estimates of incurred but not reported losses for traditional life and accident and health products. For interest-sensitive products, benefits are the amounts paid and expected to be paid on insured claims in excess of the policyholders' policy fund balances.

Reserves for Policy and Contract Benefits: Policy reserves represent future policy and contract benefits for claims not yet incurred. Policy reserves for traditional life and accident and health products are determined using the net level premium method. The reserves are calculated based upon assumptions as to interest, persistency, morbidity, and mortality that were appropriate at the date of issue. Interest rate assumptions are based on actual and expected net investment returns. Persistency assumptions are based on our actual historical experience adjusted for future expectations. Morbidity and mortality assumptions are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by plan, year of issue, and policy duration and include a provision for adverse deviation.

Policy reserves for group single premium annuities have been provided on a net single premium method. The reserves are calculated based on assumptions as to interest, mortality, and retirement that were appropriate at the date of issue. Mortality assumptions are based upon industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by year of issue.

Policy reserves for interest-sensitive products are principally policyholder account values.

We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency.

106

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Claim reserves represent future policy and contract benefits for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Our claim reserves relate primarily to disability policies and are calculated based on assumptions as to interest and claim resolution rates that are currently appropriate. Claim resolution rate assumptions are based on our actual experience. The interest rate assumptions used for discounting claim reserves are based on projected portfolio yield rates, after consideration for defaults and investment expenses, for the assets supporting the liabilities for the various product lines. Unlike policy reserves for which assumptions are generally established and locked in at the time of policy issuance, claim reserves are subject to revision as current claim experience and projections of future experience change. See Note 6.

Policyholders' Funds: Policyholders' funds represent customer deposits plus interest credited at contract rates. We control interest rate risk by investing in quality assets which have an aggregate duration that closely matches the expected duration of the liabilities.

Income Tax: Deferred taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial statement purposes and the amounts used for income tax purposes. Deferred taxes have been measured using enacted statutory income tax rates and laws that are currently in effect. We record deferred tax assets for tax positions taken in the U.S. and other tax jurisdictions based on our assessment of whether a position is more likely than not to be sustained upon examination based solely on its technical merits.  A valuation allowance is established for deferred tax assets when it is more likely than not that an amount will not be realized. See Note 7.

Short-term and Long-term Debt: Debt is generally carried at the unpaid principal balance, net of unamortized discount or premium. Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements and repurchase agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty. Original issue discount or premium as well as debt issue costs are recognized as a component of interest expense over the period the debt is expected to be outstanding. The carrying amount of long-term debt that is part of a fair value hedge program includes an adjustment to reflect the effect of the change in fair value attributable to the risk being hedged. Net interest settlements for fair value hedges on our long-term debt are recognized as a component of interest expense. See Note 8.

Treasury Stock and Retirement of Common Stock: Treasury stock is reflected as a reduction of stockholders' equity at cost. When shares are retired, the par value is removed from common stock, and the excess of the repurchase price over par is allocated between additional paid-in capital and retained earnings.

Revenue Recognition: Traditional life and accident and health products are long-duration contracts, and premium income is recognized as revenue when due from policyholders. If the contracts are experience rated, the estimated ultimate premium is recognized as revenue over the period of the contract. The estimated ultimate premium, which is revised to reflect current experience, is based on estimated claim costs, expenses, and profit margins.

For interest-sensitive products, the amounts collected from policyholders are considered deposits, and only the deductions during the period for cost of insurance, policy administration, and surrenders are included in revenue. Policyholders' funds represent funds deposited by contract holders and are not included in revenue.

Fees from our administrative-services only and family medical leave products are reported as other income when services are rendered.

Reinsurance: We routinely enter into reinsurance agreements with other insurance companies to spread risk and thereby limit losses from large exposures. For each of our reinsurance agreements, we determine if the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. If we determine that a reinsurance agreement does not expose the reinsurer to a reasonable possibility of a significant loss from insurance risk, we record the agreement using the deposit method of accounting.  

107

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Reinsurance activity is accounted for on a basis consistent with the terms of the reinsurance contracts and the accounting used for the original policies issued. Premium income and benefits and change in reserves for future benefits are presented in our consolidated statements of income net of reinsurance ceded. Ceded liabilities for policy and contract benefits, future policy and contract benefits, and unearned premiums are reported on a gross basis in our consolidated balance sheets, as are ceded policy loans. Our reinsurance recoverable includes the balances due from reinsurers under the terms of the reinsurance agreements for these ceded balances as well as settlement amounts currently due.

Where applicable, gains or losses on reinsurance transactions are deferred and amortized into earnings based upon expected future premium income for traditional insurance policies and estimated future gross profits for interest-sensitive insurance policies. The deferred gain on reinsurance included in other liabilities in our consolidated balance sheets at December 31, 2013 and 2012 was $53.6 million and $67.4 million, respectively.

Under ceded reinsurance agreements wherein we are not relieved of our legal liability to our policyholders, if the assuming reinsurer is unable to meet its obligations, we remain contingently liable. We evaluate the financial condition of reinsurers and monitor concentration of credit risk to minimize this exposure. We may also require assets in trust, letters of credit, or other acceptable collateral to support our reinsurance recoverable balances. In the event that reinsurers do not meet their obligations to us under the terms of the reinsurance agreements, certain amounts reported in our reinsurance recoverable could become uncollectible, in which case the reinsurance recoverable balances are stated net of allowances for uncollectible reinsurance. See Note 12.

Premium Tax Expense: Premium tax expense is included in other expenses in the consolidated statements of income. For the years ended December 31, 2013, 2012, and 2011, premium tax expense was $137.0 million, $136.0 million, and $134.9 million, respectively.

Stock-Based Compensation: The cost of stock-based compensation is generally measured based on the grant-date fair value of the award. The Black-Scholes options valuation model is used for estimating the fair value of stock options, and the Monte-Carlo valuation model is used for estimating the fair value of performance share units. Restricted stock units are valued based on the fair value of common stock at the grant date, and cash-settled awards are measured each reporting period based on the current stock price. Stock-based awards are expensed over the requisite service period, with an offsetting increase to additional paid-in capital in stockholders' equity. See Note 11.

Earnings Per Share: We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. Earnings per share assuming dilution is computed by dividing net income by the weighted average number of shares outstanding for the period plus the shares representing the dilutive effect of stock-based awards. In computing earnings per share assuming dilution, only potential common shares resulting from stock-based awards that are dilutive (those that reduce earnings per share) are included. We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards on the computation of earnings per share assuming dilution. See Note 10.

Translation of Foreign Currency: Revenues and expenses of our foreign operations are translated at average exchange rates. Assets and liabilities are translated at the rate of exchange on the balance sheet dates. The translation gain or loss is generally reported in accumulated other comprehensive income, net of deferred tax. We do not provide for deferred taxes to the extent unremitted foreign earnings are deemed permanently invested.

Accounting for Participating Individual Life Insurance: Participating policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual to a stock life insurance company will remain participating as long as the policies remain in-force. A Participation Fund Account (PFA) was established for the benefit of all such individual participating life and annuity policies and contracts. The assets of the PFA provide for the benefit, dividend, and certain expense obligations of the participating individual life insurance policies and annuity contracts. The assets of the PFA were $339.2 million and $380.4 million at December 31, 2013 and 2012, respectively.

108

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 815 "Derivatives and Hedging"

In July 2013, the FASB issued an update which allows entities to use the Fed Funds Effective Swap Rate, also referred to as the Overnight Index Swap Rate (OIS), as a benchmark interest rate for hedge accounting purposes. Previously the only acceptable benchmark rates for hedge accounting purposes under GAAP were U.S. Treasury rates and the London Interbank Offered Rate (LIBOR) swap rate. This update reflects the evolution of market hedging practices and is intended to provide more flexibility in hedging interest rate risk. We adopted this update effective July 17, 2013 for qualifying new or redesignated hedging relationships entered into on or after that date.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the FASB issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. We adopted this update effective January 1, 2012. The adoption of this update modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

109

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 1 - Significant Accounting Policies - Continued

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods in our consolidated financial statements and accompanying notes.

Accounting Updates Adopted in 2011:

ASC 310 "Receivables"

In April 2011, the FASB issued an update to provide additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted this update effective July 1, 2011. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 323 "Investments - Equity Method and Joint Ventures"

In January 2014, the FASB issued an update to provide guidance on the accounting and reporting for investments in affordable housing projects that qualify for low-income housing tax credits. The amendments in the update permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Additional disclosures concerning investments in qualified affordable housing projects will also be required by the update. The amendments in the update are effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted, and are to be applied retrospectively. We have not yet finalized the expected impact on our financial position or results of operations.

110

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the following chart.

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,344.4	$	42,344.4	$	44,973.0	$	44,973.0
Mortgage Loans	1,815.1		1,980.2		1,712.7		1,937.1
Policy Loans	3,276.0		3,339.6		3,133.8		3,215.3
Other Long-term Investments
Derivatives	10.8		10.8		81.6		81.6
Equity Securities	16.4		16.4		14.6		14.6
Miscellaneous Long-term Investments	475.2		475.2		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	631.5	$	631.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	563.1		563.1		535.5		535.5
Long-term Debt	2,612.0		2,824.4		2,755.4		2,968.8
Other Liabilities
Derivatives	135.6		135.6		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	53.2		53.2		83.9		83.9
Unfunded Commitments to Investment Partnerships	27.2		27.2		83.7		83.7

The methods and assumptions used to estimate fair values of financial instruments are discussed as follows.

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

Mortgage Loans: Fair values are estimated using discounted cash flow analyses and interest rates currently being offered for similar loans to borrowers with similar credit ratings and maturities. Loans with similar characteristics are aggregated for purposes of the calculations. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Policy Loans: Fair values for policy loans, net of reinsurance ceded, are estimated using discounted cash flow analyses and interest rates currently being offered to policyholders with similar policies. Carrying amounts for ceded policy loans, which equal $3,043.7 million and $2,912.7 million as of December 31, 2013 and 2012, respectively, approximate fair value and are reported on a gross basis in our consolidated balance sheets. A change in interest rates for ceded policy loans will not impact our financial position because the benefits and risks are fully ceded to reinsuring counterparties. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Fair values for private equity partnerships are primarily derived from net asset values provided by the general partner in the partnerships' financial statements. Our private equity partnerships represent funds that are primarily invested in power, energy, railcar leasing, infrastructure development, and mezzanine debt. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. As of December 31, 2013, we estimate that the underlying assets of the funds will be liquidated over the next one to ten years. These financial instruments are assigned a Level 3 within the fair value hierarchy.

111

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

Policyholders' Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies and represent customer deposits plus interest credited at contract rates. Carrying amounts approximate fair value. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Fair values for insurance contracts other than investment contracts are not required to be disclosed. However, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which seeks to minimize exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

Long-term Debt: Fair values for long-term debt are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements. Debt instruments which are valued using active trades from independent pricing services for which there was current market activity in that specific debt instrument have fair values of $1,329.2 million and $1,212.0 million as of December 31, 2013 and 2012, respectively, and are assigned a Level 1 within the fair value hierarchy. Debt instruments which are valued based on prices from pricing services that generally use observable inputs for securities or comparable securities in active markets in their valuation techniques have fair values of $1,495.2 million and $1,756.8 million as of December 31, 2013 and 2012, respectively, and are assigned a Level 2.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent legally binding amounts that we have committed to certain investment partnerships subject to the partnerships meeting specified conditions. When these conditions are met, we are obligated to invest these amounts in the partnerships. Carrying amounts approximate fair value. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, derivative financial instruments, and equity securities at fair value in our consolidated balance sheets. The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. An active market for a financial instrument is a market in which transactions for an asset or a similar asset occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value and should be used to measure fair value whenever available. Conversely, financial instruments rarely traded or not quoted have less observability and are measured at fair value using valuation techniques that require more judgment. Pricing observability is generally impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, the characteristics specific to the transaction, and overall market conditions.

Valuation techniques used for assets and liabilities accounted for at fair value are generally categorized into three types. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets or liabilities. The income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. The cost approach is based upon the amount that currently would be required to replace the service capacity of an asset, or the current replacement cost.

We use valuation techniques that are appropriate in the circumstances and for which sufficient data are available that can be obtained without undue cost and effort. In some cases, a single valuation technique will be appropriate (for example, when valuing an asset or liability using quoted prices in an active market for identical assets or liabilities). In other cases, multiple valuation techniques will be appropriate. If we use multiple valuation techniques to measure fair value, we evaluate and weigh the results, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The selection of the valuation method(s) to apply considers the definition of an exit price and depends on the nature of the asset or liability being valued. For assets and liabilities accounted for at fair value, we generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. We believe the market approach valuation technique provides more observable data than the income approach, considering the type of investments we hold. Our fair value measurements could differ significantly based on the valuation technique and available inputs. When using a pricing service, we

112

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

obtain the vendor's pricing documentation to ensure we understand their methodologies. We periodically review and approve the selection of our pricing vendors to ensure we are in agreement with their current methodologies. When markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. Our internal investment management professionals, which include portfolio managers and analysts, monitor securities priced by brokers and evaluate their prices for reasonableness based on benchmarking to available primary and secondary market information. In weighing a broker quote as an input to fair value, we place less reliance on quotes that do not reflect the result of market transactions. We also consider the nature of the quote, particularly whether the quote is a binding offer. If prices in an inactive market do not reflect current prices for the same or similar assets, adjustments may be necessary to arrive at fair value. When relevant market data is unavailable, which may be the case during periods of market uncertainty, the income approach can, in suitable circumstances, provide a more appropriate fair value. During 2013, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2012.

We use observable and unobservable inputs in measuring the fair value of our financial instruments. Inputs that may be used include the following:

• Broker market maker prices and price levels

• Trade Reporting and Compliance Engine (TRACE) pricing

• Prices obtained from external pricing services

• Benchmark yields (Treasury and interest rate swap curves)

• Transactional data for new issuance and secondary trades

• Security cash flows and structures

• Recent issuance/supply

• Sector and issuer level spreads

• Security credit ratings/maturity/capital structure/optionality

• Corporate actions

• Underlying collateral

• Prepayment speeds/loan performance/delinquencies/weighted average life/seasoning

• Public covenants

• Comparative bond analysis

• Derivative spreads

• Relevant reports issued by analysts and rating agencies 

• Audited financial statements

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices obtained to ensure they are consistent with a variety of observable market inputs and to verify the validity of a security's price.  In the event we receive a vendor's market price that does not appear reasonable based on our market analysis, we may challenge the price and request further information about the assumptions and methodologies used by the vendor to price the security. We may change the vendor price based on a better data source such as an actual trade. We also review all price changes from the prior month which fall outside a predetermined corridor. The overall valuation process for determining fair values may include adjustments to valuations obtained from our pricing sources when they do not represent a valid exit price. These adjustments may be made when, in our judgment and considering our knowledge of the financial conditions and industry in which the issuer operates, certain features of the financial instrument require that an adjustment be made to the value originally obtained from our pricing sources. These features may include the complexity of the financial instrument, the market in which the financial instrument is traded, counterparty credit risk, credit structure, concentration, or liquidity. Additionally, an adjustment to the price derived from a model typically reflects our judgment of the inputs that other participants in the market for the financial instrument being measured at fair value would consider in pricing that same financial instrument. In the event an asset is sold, we test the validity of the fair value determined by our valuation techniques by comparing the selling price to the fair value determined for the asset in the immediately preceding month end reporting period closest to the transaction date.

The parameters and inputs used to validate a price on a security may be adjusted for assumptions about risk and current market conditions on a quarter to quarter basis, as certain features may be more significant drivers of valuation at the time of pricing. Changes to inputs in valuations are not changes to valuation methodologies; rather, the inputs are modified to reflect direct or indirect impacts on asset classes from changes in market conditions.

113

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

Fair values for derivatives other than embedded derivatives in modified coinsurance arrangements are based on market quotes or pricing models and represent the net amount of cash we would have paid or received if the contracts had been settled or closed as of the last day of the period. We analyze credit default swap spreads relative to the average credit spread embedded within the LIBOR-setting syndicate in determining the effect of credit risk on our derivatives' fair values.  If net counterparty credit risk for a derivative asset is determined to be material and is not adequately reflected in the LIBOR-based fair value obtained from our pricing sources, we adjust the valuations obtained from our pricing sources. For purposes of valuing net counterparty risk, we measure the fair value of a group of financial assets and financial liabilities on the basis of the price that would be received to sell a net long position or transfer a net short position for a particular risk exposure in an orderly transaction between market participants at the measurement date under current market conditions. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

Fair values for our embedded derivative in a modified coinsurance arrangement are estimated using internal pricing models and represent the hypothetical value of the duration mismatch of assets and liabilities, interest rate risk, and third party credit risk embedded in the modified coinsurance arrangement.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations combining matrix pricing with vendor purchased software programs, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

At December 31, 2013, approximately 6.0 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

The remaining 94.0 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 76.0 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2.  Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

• Approximately 4.1 percent of our fixed maturity securities were valued based on one or more non-binding broker price levels, if validated by observable market data, or on TRACE prices for identical or similar assets absent current market activity. When only one price is available, it is used if observable inputs and analysis confirms that it is appropriate. These assets, for which we were able to validate the price using other observable market data, were classified as Level 2.

• Approximately 13.9 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.  Level 3 is the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

114

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

We consider transactions in inactive or disorderly markets to be less representative of fair value. We use all available observable inputs when measuring fair value, but when significant other unobservable inputs and adjustments are necessary, we classify these assets or liabilities as Level 3.

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	144.5	$	1,051.6	$	—	$	1,196.1
States, Municipalities, and Political Subdivisions	—		1,608.1		175.1		1,783.2
Foreign Governments	—		1,294.7		78.5		1,373.2
Public Utilities	396.8		9,802.7		203.5		10,403.0
Mortgage/Asset-Backed Securities	—		2,038.8		0.5		2,039.3
All Other Corporate Bonds	1,982.0		21,670.8		1,859.1		25,511.9
Redeemable Preferred Stocks	—		13.9		23.8		37.7
Total Fixed Maturity Securities	2,523.3		37,480.6		2,340.5		42,344.4
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		9.2		—		9.2
Foreign Exchange Contracts	—		1.6		—		1.6
Total Derivatives	—		10.8		—		10.8
Equity Securities	—		11.8		4.6		16.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	35.0	$	—	$	35.0
Foreign Exchange Contracts	—		98.7		—		98.7
Credit Default Swaps	—		1.9		—		1.9
Embedded Derivative in Modified Coinsurance Arrangement	—		—		53.2		53.2
Total Derivatives	—		135.6		53.2		188.8

115

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

116

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

Transfers of assets between Level 1 and Level 2 are as follows:

	Year Ended December 31
	2013				2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	62.2	$	—	$	—	$	224.7
States, Municipalities, and Political Subdivisions	—		53.0		—		43.8
Public Utilities	345.9		53.4		47.1		653.1
All Other Corporate Bonds	1,199.0		1,085.3		1,068.6		2,808.9
Total Fixed Maturity Securities	$	1,607.1	$	1,191.7	$	1,115.7	$	3,730.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

117

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Year Ended December 31, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(13.1	)	$	—	$	(1.0	)	$	60.5	$	—		$	175.1
Foreign Governments	82.1			—			(3.6		)	—		—			—		—			78.5
Public Utilities	574.4			—			(10.8		)	—		(3.1		)	151.8		(508.8		)	203.5
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(147.1		)	186.7		(122.0		)	1,462.0		(699.4		)	1,859.1
Redeemable Preferred Stocks	24.8			—			(1.0		)	—		—			—		—			23.8
Total Fixed Maturity Securities	1,988.3			1.1			(175.5		)	186.7		(126.2		)	1,674.3		(1,208.2		)	2,340.5
Equity Securities	4.3			—			0.3			—		—			—		—			4.6
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	30.7			—			—		—			—		—			(53.2		)
	Year Ended December 31, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.3	)	$	18.4	$	(0.7	)	$	43.2	$	—		$	128.7
Foreign Governments	—			—			5.0			15.4		—			61.7		—			82.1
Public Utilities	338.9			—			22.3			47.9		(4.2		)	481.4		(311.9		)	574.4
Mortgage/Asset-Backed Securities	31.7			—			—			—		(0.1		)	—		(31.1		)	0.5
All Other Corporate Bonds	665.5			1.2			40.8			151.6		(67.5		)	599.8		(213.6		)	1,177.8
Redeemable Preferred Stocks	37.2			(1.0		)	2.9			—		(14.3		)	—		—			24.8
Total Fixed Maturity Securities	1,141.4			0.2			70.7			233.3		(86.8		)	1,186.1		(556.6		)	1,988.3
Equity Securities	11.2			(0.1		)	—			—		(0.1		)	—		(6.7		)	4.3
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	51.8			—			—		—			—		—			(83.9		)

118

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation. Gains for the years ended December 31, 2013 and 2012 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at each year end were $30.7 million and $51.8 million, respectively. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	December 31, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	142.7		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.65%
Public Utilities	64.3			- Volatility of Credit	(e)	0.75% - 1.25% / 0.92%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	4.93% - 5.03% / 5.01%
All Other Corporate Bonds - Private	307.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	3.36% - 3.36% / 3.36% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.07% - 4.00% / 0.84% Priced at Par
All Other Corporate Bonds - Public	514.4			- Change in Benchmark Reference - Comparability Adjustment - Lack of Marketability - Volatility of Credit	(a) (b) (d) (e)	(0.32)% - 0.25% / 0.04% (0.23)% - 1.00% / 0.41% 0.20% - 0.20% / 0.20% (0.88)% - 0.46% / (0.26)%
Equity Securities - Private	4.2			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(53.2		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

119

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 2 - Fair Values of Financial Instruments - Continued

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

(e) Represents basis point adjustments for credit-specific factors

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

Isolated increases in unobservable inputs other than market convention will result in a lower fair value measurement, whereas isolated decreases will result in a higher fair value measurement. The unobservable input for market convention is not sensitive to input movements. The projected liability cash flows used in the fair value measurement of our Level 3 embedded derivative are based on expected claim payments. If claim payments increase, the projected liability cash flows will increase, resulting in a decrease in the fair value of the embedded derivative. Decreases in projected liability cash flows will result in an increase in the fair value of the embedded derivative.

120

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments

Fixed Maturity Securities

At December 31, 2013 and 2012, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	December 31, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,028.6	$	173.1	$	5.6	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		117.2		40.0		1,783.2
Foreign Governments	1,226.4		149.6		2.8		1,373.2
Public Utilities	9,328.9		1,126.9		52.8		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		184.6		4.0		2,039.3
All Other Corporate Bonds	23,108.0		2,602.6		198.7		25,511.9
Redeemable Preferred Stocks	33.0		4.7		—		37.7
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	303.9	$	42,344.4

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	December 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	41.1	$	3.1	$	5.2	$	2.5
States, Municipalities, and Political Subdivisions	412.5		33.5		37.2		6.5
Foreign Governments	87.2		2.8		—		—
Public Utilities	870.6		47.1		58.7		5.7
Mortgage/Asset-Backed Securities	341.0		3.6		2.5		0.4
All Other Corporate Bonds	3,412.3		174.0		207.4		24.7
Total Fixed Maturity Securities	$	5,164.7	$	264.1	$	311.0	$	39.8

121

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	December 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	903.9	$	20.6	$	915.5	$	—	$	9.0
Over 1 year through 5 years	7,098.2		727.1		7,678.5		0.6		146.2
Over 5 years through 10 years	9,492.6		940.2		8,137.4		95.8		2,199.6
Over 10 years	18,936.2		2,486.2		18,441.5		203.5		2,777.4
	36,430.9		4,174.1		35,172.9		299.9		5,132.2
Mortgage/Asset-Backed Securities	1,858.7		184.6		1,695.8		4.0		343.5
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	36,868.7	$	303.9	$	5,475.7

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

At December 31, 2013, the fair value of investment-grade fixed maturity securities was $39,145.1 million, with a gross unrealized gain of $4,205.0 million and a gross unrealized loss of $247.8 million. The gross unrealized loss on investment-grade fixed maturity securities was 81.5 percent of the total gross unrealized loss on fixed maturity securities. Unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities.

122

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

At December 31, 2013, the fair value of below-investment-grade fixed maturity securities was $3,199.3 million, with a gross unrealized gain of $153.7 million and a gross unrealized loss of $56.1 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 18.5 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At December 31, 2013, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded an other-than-temporary impairment will recover in value.

As of December 31, 2013, we held 245 individual investment-grade fixed maturity securities and 53 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 16 investment-grade fixed maturity securities and 8 below-investment-grade fixed maturity securities had been in an unrealized loss position continuously for over one year.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate the following factors:

• Whether we expect to recover the entire amortized cost basis of the security

• Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis

• Whether the security is current as to principal and interest payments

• The significance of the decline in value

• The time period during which there has been a significant decline in value

• Current and future business prospects and trends of earnings

• The valuation of the security's underlying collateral

• Relevant industry conditions and trends relative to their historical cycles

• Market conditions

• Rating agency and governmental actions

• Bid and offering prices and the level of trading activity

• Adverse changes in estimated cash flows for securitized investments

• Changes in fair value subsequent to the balance sheet date

• Any other key measures for the related security

While determining other-than-temporary impairments is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of problem investments and the recording of losses on a timely basis for investments determined to have an other-than-temporary impairment.

We held no fixed maturity securities during 2013 or 2012 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income. During 2011, we held and sold one fixed maturity security for which an $8.5 million other-than-temporary impairment had been recognized in other comprehensive income.

At December 31, 2013, we had non-binding commitments of $58.0 million to fund private placement fixed maturity securities. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments include tax credit partnerships, private equity partnerships, and special purpose entities. For those variable interests that are not consolidated in our financial statements, we are not the primary beneficiary because we have neither the power to direct the activities that are most significant to economic performance nor the responsibility to absorb a majority of the expected losses. The determination of whether we are the primary beneficiary is performed at the time of our initial investment and at the date of each subsequent reporting period.

123

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

As of December 31, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $470.8 million, comprised of $309.5 million of tax credit partnerships and $161.3 million of private equity partnerships. These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Additionally, we recognize a liability for all legally binding unfunded commitments to these partnerships, with a corresponding recognition of an invested asset.  Our liability for legally binding unfunded commitments to the tax credit partnerships was $27.2 million at December 31, 2013. Contractually, we are a limited partner in these investments, and our maximum exposure to loss is limited to the carrying value of our investment. We also had non-binding commitments of $158.4 million to fund certain private equity partnerships at December 31, 2013, the amount of which may or may not be funded.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection and a private equity partnership investment.  We contributed the bond and several partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the remaining partnership while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  The fair values of the bond and partnership were $136.2 million and $4.4 million, respectively, as of December 31, 2013.  The bond is reported as a component of fixed maturity securities, and the partnership is reported as a component of other long-term investments in our consolidated balance sheets. At December 31, 2013, we had no commitments to fund the underlying partnership, nor did we fund any amounts to the partnerships during the years ended December 31, 2013, 2012, and 2011.

Mortgage Loans

Our mortgage loan portfolio is well diversified by both geographic region and property type to reduce risk of concentration. All of our mortgage loans are collateralized by commercial real estate. When issuing a new loan, our general policy is not to exceed a loan-to-value ratio, or the ratio of the loan balance to the estimated fair value of the underlying collateral, of 75 percent. We update the loan-to-value ratios at least every three years for each loan, and properties undergo a general inspection at least every two years. Our general policy for newly issued loans is to have a debt service coverage ratio greater than 1.25 times on a normalized 25 year amortization period. We update our debt service coverage ratios annually.

124

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

Mortgage loans by property type and geographic region are presented below. Prior year amounts by property type have been reclassified to conform to the current year presentation.

	December 31
	2013				2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	61.1	3.3	%	$	47.2	2.7	%
Industrial	567.8		31.3		545.7		31.9
Office	776.5		42.8		721.2		42.1
Retail	409.7		22.6		398.6		23.3
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

Region
New England	$	100.9	5.6	%	$	114.3	6.7	%
Mid-Atlantic	191.5		10.5		160.0		9.3
East North Central	244.3		13.5		224.7		13.1
West North Central	162.3		8.9		160.8		9.4
South Atlantic	447.7		24.7		440.9		25.7
East South Central	67.7		3.7		79.6		4.7
West South Central	190.9		10.5		159.5		9.3
Mountain	101.9		5.6		90.5		5.3
Pacific	307.9		17.0		282.4		16.5
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

We evaluate each of our mortgage loans individually for impairment and assign an internal credit quality rating based on a comprehensive rating system used to evaluate the credit risk of the loan. The factors we use to derive our internal credit ratings may include the following:

• Loan-to-value ratio

• Debt service coverage ratio based on current operating income

• Property location, including regional economics, trends and demographics

• Age, condition, and construction quality of property

• Current and historical occupancy of property

• Lease terms relative to market

• Tenant size and financial strength

• Borrower's financial strength

• Borrower's equity in transaction

• Additional collateral, if any

Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining whether we will initially issue the loan and also in assigning values and determining impairment. We assign an overall rating to each loan using an internal rating scale of Aa (highest quality) to B (lowest quality). We review and adjust, as needed, our internal credit quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

125

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Internal Rating
Aa	$	10.8	$	11.5
A	683.1		659.4
Baa	1,094.6		994.5
Ba	13.5		34.2
B	13.1		13.1
Total	$	1,815.1	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	777.4	$	624.7
> 65% <= 75%	867.5		858.8
> 75% <= 85%	107.6		142.5
> 85%	62.6		86.7
Total	$	1,815.1	$	1,712.7

There have been no changes to our accounting policies or methodology from the prior period regarding estimating the allowance for credit losses on our mortgage loans. The activity in the allowance for credit losses is as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5		$	1.5
Provision	—		1.8			—
Charge-offs, Net of Recoveries	—		(1.8		)	—
Balance at End of Year	$	1.5	$	1.5		$	1.5

Impaired mortgage loans are as follows:

	December 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	13.1	$	14.6	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

Our average investment in impaired mortgage loans was $14.9 million, $19.1 million, and $21.3 million for the years ended December 31, 2013, 2012, and 2011, respectively. For each of the years ended December 31, 2013, 2012, and 2011, we recognized $0.8 million of interest income on impaired mortgage loans.

126

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

A summary of our troubled debt restructurings is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.3	$	17.3	$	19.9
Number of Loans	1		3		2
Payoff/Sale
Carrying Amount	$	—	$	—	$	3.2
Realized Loss	$	—	$	—	$	0.2
Number of Loans	—		—		1

We had no realized losses on loan foreclosures for the years ended December 31, 2013, 2012, and 2011 other than the initial impairment losses recognized prior to foreclosure.

At December 31, 2013, we held no mortgage loans that were greater than 90 days past due regarding principal and/or interest payments. At December 31, 2012, we held one mortgage loan that was greater than 90 days past due and for which we had discontinued the accrual of investment income. The mortgage loan had a carrying value of $4.3 million and was foreclosed during 2013.

At December 31, 2013, we had non-binding commitments of $83.9 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

Transfers of Financial Assets

To manage our cash position more efficiently, we may enter into repurchase agreements with unaffiliated financial institutions. We generally use repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. Our repurchase agreements are typically outstanding for less than 30 days. We post collateral through our repurchase agreement transactions whereby the counterparty commits to purchase securities with the agreement to resell them to us at a later, specified date. The fair value of collateral posted is generally 102 percent of the cash received.

Our investment policy also permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements. These agreements increase our investment income with minimal risk. Our securities lending policy requires that a minimum of 102 percent of the fair value of the securities loaned be maintained as collateral. Generally, cash is received as collateral under these agreements and is typically reinvested in short-term investments. In the event that securities are received as collateral, we are not permitted to sell or re-post them.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of December 31, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $201.6 million, for which we received collateral in the form of cash and securities of $76.5 million and $132.9 million, respectively. As of December 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $452.8 million, for which we received collateral in the form of cash and securities of $455.8 million and $14.5 million, respectively. We had no outstanding repurchase agreements at December 31, 2013 or 2012.

Offsetting of Financial Instruments

We enter into master netting agreements with each of our derivatives counterparties. These agreements provide for conditional rights of set-off upon the occurrence of an early termination event. An early termination event is considered a default, and it allows the non-defaulting party to offset its contracts in a loss position against any gain positions or payments due to the defaulting party. Under our agreements, default type events are defined as failure to pay or deliver as contractually agreed, misrepresentation, bankruptcy, or merger without assumption. See Note 4 for further discussion of collateral related to our derivative contracts.

127

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

We have securities lending agreements with unaffiliated financial institutions that post collateral to us in return for the use of our fixed maturity securities. A right of set-off exists that allows us to keep and apply collateral received in the event of default by the counterparty. Default within a securities lending agreement would typically occur if the counterparty failed to return the securities borrowed from us as contractually agreed. In addition, if we default by not returning collateral received, the counterparty has a right of set-off against our securities or any other amounts due to us.

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	December 31, 2013
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	10.8	$	—	$	10.8	$	(9.5	)	$	(1.1	)	$	0.2
Securities Lending	201.6		—		201.6		(125.1		)	(76.5		)	—
Total	$	212.4	$	—	$	212.4	$	(134.6	)	$	(77.6	)	$	0.2
Financial Liabilities:
Derivatives	$	135.6	$	—	$	135.6	$	(98.6	)	$	—		$	37.0
Securities Lending	76.5		—		76.5		(76.5		)	—			—
Total	$	212.1	$	—	$	212.1	$	(175.1	)	$	—		$	37.0

	December 31, 2012
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
Financial Liabilities:
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

128

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 3 - Investments - Continued

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Fixed Maturity Securities	$	2,371.6	$	2,404.0	$	2,425.2
Derivative Financial Instruments	35.2		28.9		22.9
Mortgage Loans	109.2		107.1		100.1
Policy Loans	15.7		14.8		14.1
Other Long-term Investments	18.0		15.2		13.1
Short-term Investments	2.4		4.3		2.9
Gross Investment Income	2,552.1		2,574.3		2,578.3
Less Investment Expenses	29.5		26.9		26.9
Less Investment Income on Participation Fund Account Assets	15.7		16.1		17.4
Less Amortization of Tax Credit Partnerships	14.8		16.1		14.4
Net Investment Income	$	2,492.1	$	2,515.2	$	2,519.6

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	15.8		$	29.3		$	74.0
Gross Losses on Sales	(45.7		)	(20.4		)	(24.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—			(19.9		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	15.6			5.0			7.1
Gross Losses on Sales	—			(4.3		)	(0.5		)
Impairment Loss	(2.0		)	(1.9		)	(0.6		)
Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8			(39.4		)
Credit Default Swaps	(1.9		)	—			—
Foreign Currency Transactions	(4.9		)	(3.3		)	(1.6		)
Net Realized Investment Gain (Loss)	$	6.8		$	56.2		$	(4.9	)

129

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 4 - Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, and credit risk.Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps and U.S. Treasury rates, current and forward currency swaps, forward treasury locks, currency forward contracts, forward contracts on specific fixed income securities, and credit default swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes. We do not use derivative financial instruments for speculative purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk are as follows:

• Interest rate swaps are used to hedge interest rate risks and to improve the matching of assets and liabilities. An interest rate swap is an agreement in which we agree with other parties to exchange, at specified intervals, the difference between fixed rate and variable rate interest amounts. We use interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• Forward treasury locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities. A forward treasury lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific U.S. Treasury bond at a future date at a pre-determined price.

• Options on U.S. Treasury rates are used to hedge the interest rate risk associated with the anticipated purchase of fixed maturity securities. These options give us the right, but not the obligation, to receive a specific interest rate for a specified period of time. These options enable us to lock in a minimum investment yield to hedge the potential adverse impact of declining interest rates.

Derivatives designated as fair value hedges and used to reduce our exposure to interest rate and duration risk are as follows:

• Interest rate swaps are used to effectively convert certain of our fixed rate securities into floating rate securities which are used to fund our floating rate long-term debt. Under these swap agreements, we receive a variable rate of interest and pay a fixed rate of interest. Additionally, we use interest rate swaps to effectively convert certain fixed rate, long-term debt into floating rate long-term debt. Under these swap agreements, we receive a fixed rate of interest and pay a variable rate of interest.

Derivatives designated as cash flow hedges and used to reduce our exposure to foreign currency risk are as follows:

• Foreign currency interest rate swaps have historically been used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification and to hedge the currency risk associated with certain of the principal and interest payments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries . For hedges of fixed maturity securities, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment. For hedges of debt issued, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments to the counterparty in exchange for fixed rate U.S. dollar-denominated principal and interest payments.

• Foreign currency forward contracts are used to minimize foreign currency risks. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We have used these forward contracts to hedge the foreign currency risk associated with certain of the principal repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

130

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 4 - Derivative Financial Instruments - Continued

Derivatives not designated as hedging instruments and used to reduce our exposure to credit losses on securities owned are as follows:

• Credit default swaps are used as economic hedges against credit risk but do not qualify for hedge accounting. A credit default swap is an agreement in which we agree with another party to pay, at specified intervals, a fixed-rate fee in exchange for insurance against a credit event on a specific investment. If a defined credit event occurs, our counterparty may either pay us a net cash settlement or we may surrender the specific investment to them in exchange for cash equal to the full notional amount of the swap. Credit events typically include events such as bankruptcy, failure to pay, or certain types of debt restructuring.

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held, was $5.5 million at December 31, 2013. We held $1.1 million cash collateral from our counterparties at December 31, 2013. We held no cash collateral at December 31, 2012. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $95.6 million and $108.6 million at December 31, 2013 and 2012, respectively. We had no cash posted as collateral to our counterparties at December 31, 2013. We had $1.8 million cash posted as collateral to our counterparties at December 31, 2012. See Note 3 for further discussion of our master netting agreements.

The majority of our derivative instruments contain provisions that require us to maintain specified issuer credit ratings and financial strength ratings. Should our ratings fall below these specified levels, we would be in violation of the provisions, and our derivatives counterparties could terminate our contracts and request immediate payment. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position was $135.6 million and $170.5 million at December 31, 2013 and 2012, respectively.

131

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 4 - Derivative Financial Instruments - Continued

Derivative Transactions

The table below summarizes, by notional amounts, the activity for each category of derivatives. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	—	$	—	$	1,681.9
Additions	—		—		—		—		46.9		—		46.9
Terminations	—		63.9		205.0		—		46.9		—		315.8
Balance at December 31, 2011	174.0		554.0		685.0		—		—		—		1,413.0
Additions	—		—		250.0		—		86.0		—		336.0
Terminations	—		45.2		185.0		—		86.0		—		316.2
Balance at December 31, 2012	174.0		508.8		750.0		—		—		—		1,432.8
Additions	—		160.0		—		97.0		24.0		10.0		291.0
Terminations	24.0		38.4		150.0		—		24.0		10.0		246.4
Balance at December 31, 2013	$	150.0	$	630.4	$	600.0	$	97.0	$	—	$	—	$	1,477.4

Cash Flow Hedges

As of December 31, 2013 and 2012, we had $630.4 million and $508.8 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities and long-term debt. During 2013, we entered into $150.0 million notional amount of receive fixed, pay fixed foreign currency swaps to hedge the currency risk on a portion of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries. As of December 31, 2012, we had $150.0 million notional amount of receive fixed, pay variable forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities. These interest rate swaps were terminated as scheduled in 2013.

For the years ended December 31, 2013, 2012, and 2011 there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness.

As of December 31, 2013, we expect to amortize approximately $46.7 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of December 31, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $150.0 million and $174.0 million, respectively, notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. The change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a gain (loss) of $(11.5) million, $(1.2) million and $8.1 million for the years ended December 31, 2013, 2012, and 2011, respectively, with an offsetting gain or loss on the related interest rate swaps.

132

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 4 - Derivative Financial Instruments - Continued

As of December 31, 2013 and 2012, we had $600.0 million notional amount of receive fixed, pay variable interest rate swaps to hedge the changes in the fair value of certain fixed rate long-term debt. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provide for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. The change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a gain (loss) of $21.1 million, $(6.6) million, and $(23.2) million for the years ended December 31, 2013, 2012, and 2011, respectively, with an offsetting gain or loss on the related interest rate swaps.

For the years ended December 31, 2013, 2012, and 2011, there was no material ineffectiveness related to our fair value hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives not Designated as Hedging Instruments

As of December 31, 2013, we held $97.0 million notional amount of single name credit default swaps. We entered into these swaps in order to mitigate the credit risk associated with specific securities owned. We had no open credit default swaps as of December 31, 2012.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our realized investment gains and losses a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract. There are no credit-related counterparty triggers, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down.

Locations and Amounts of Derivative Financial Instruments

The following tables summarize the location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	December 31, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	9.2	Other Liabilities	$	35.0
Foreign Exchange Contracts	Other L-T Investments	1.6		Other Liabilities	98.7
Total		$	10.8		$	133.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.9
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	53.2
Total					$	55.1

133

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 4 - Derivative Financial Instruments - Continued

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

The following table summarizes the location of gains and losses on the effective portion of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of income and consolidated statements of comprehensive income.

		Year Ended December 31
		2013			2012			2011
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	(7.2	)	$	77.9		$	50.3
Options		(0.1		)	—			—
Foreign Exchange Contracts		22.6			3.5			22.4
	Total	$	15.3		$	81.4		$	72.7
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	43.1		$	40.0		$	34.8
	Foreign Exchange Contracts	(5.9		)	(5.3		)	(1.1		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	1.3			4.1			3.5
	Foreign Exchange Contracts	(13.8		)	(17.0		)	10.1
Interest and Debt Expense
	Interest Rate Swaps	(1.7		)	(1.7		)	(1.6		)
	Total	$	23.0		$	20.1		$	45.7

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

		Year Ended December 31
		2013			2012		2011
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.9	)	$	—	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8		(39.4		)
	Total	$	28.8		$	51.8	$	(39.4	)

134

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 5 - Accumulated Other Comprehensive Income

Components of our accumulated other comprehensive income, after tax, and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(746.4		)	9.7			25.5			328.6			(382.6		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	8.6			(15.0		)	—			16.0			9.6
	Net Other Comprehensive Income (Loss)	(737.8		)	(5.3		)	25.5			344.6			(373.0		)
Balance at December 31, 2013		$	135.7		$	396.3		$	(47.1	)	$	(229.9	)	$	255.0

The net unrealized gain on securities consists of the following components:

	December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	4,054.8		$	7,221.5		$	(3,166.7	)
Other Investments	55.5			92.8			(37.3		)
Deferred Acquisition Costs	(41.6		)	(67.0		)	25.4
Reserves for Future Policy and Contract Benefits	(4,108.5		)	(6,277.5		)	2,169.0
Reinsurance Recoverable	263.8			351.5			(87.7		)
Deferred Income Tax	(88.3		)	(447.8		)	359.5
Total	$	135.7		$	873.5		$	(737.8	)

135

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 5 - Accumulated Other Comprehensive Income - Continued

Amounts reclassified from accumulated other comprehensive income were recognized in our consolidated statements of income as follows:

			Year Ended
			December 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(12.6	)
		Other-Than-Temporary Impairment Loss	(0.8		)
			(13.4		)
	Income Tax Benefit		(4.8		)
	Total		$	(8.6	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	43.1
		Loss on Foreign Exchange Contracts	(5.9		)
	Net Realized Investment Gain (Loss)
		Gain on Interest Rate Swaps	1.3
		Loss on Foreign Exchange Contracts	(13.8		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(1.7		)
			23.0
	Income Tax Expense		8.0
	Total		$	15.0
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(32.9	)
		Amortization of Prior Service Credit	5.0
		Curtailment Gain	3.0
			(24.9		)
	Income Tax Benefit		(8.9		)
	Total		$	(16.0	)

136

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 6 - Liability for Unpaid Claims and Claim Adjustment Expenses

Changes in the liability for unpaid claims and claim adjustment expenses are as follows:

	2013			2012			2011
	(in millions of dollars)
Balance at January 1	$	24,567.1		$	24,586.5		$	24,339.4
Less Reinsurance Recoverable	2,006.0			2,042.6			2,028.2
Net Balance at January 1	22,561.1			22,543.9			22,311.2
Incurred Related to
Current Year	4,751.9			4,946.2			4,684.4
Prior Years
Interest	1,230.0			1,247.6			1,262.9
All Other Incurred	(44.7		)	(175.7		)	209.1
Foreign Currency	41.2			101.1			(10.9		)
Total Incurred	5,978.4			6,119.2			6,145.5
Paid Related to
Current Year	(1,657.3		)	(1,715.4		)	(1,588.6		)
Prior Years	(4,419.4		)	(4,386.6		)	(4,324.2		)
Total Paid	(6,076.7		)	(6,102.0		)	(5,912.8		)
Net Balance at December 31	22,462.8			22,561.1			22,543.9
Plus Reinsurance Recoverable	2,072.8			2,006.0			2,042.6
Balance at December 31	$	24,535.6		$	24,567.1		$	24,586.5

The majority of the net balances are related to disability claims with long-tail payouts on which interest earned on assets backing liabilities is an integral part of pricing and reserving. Interest accrued on prior year reserves has been calculated on the opening reserve balance less one-half year's cash payments at our average reserve discount rate used during 2013, 2012, and 2011.

"Incurred Related to Prior Years - All Other Incurred" for the years shown in the preceding chart includes the reserve adjustments as discussed in the following paragraphs, which create variances year over year. Excluding those adjustments, the variability exhibited year over year is caused primarily by the level of claim resolutions in the period relative to the long-term expectations reflected in the reserves. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period, both favorably and unfavorably. Claim resolution rates for 2013 in the Unum US group long-term disability product line were less favorable than the level of 2012, though still above the level of our long-term assumptions.

2013 Unclaimed Death Benefits Reserve Increase

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. In addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years.

During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established $95.5 million of additional claim reserves for payment of these benefits. Claim reserves were increased $49.1 million for Unum US group life, $26.3 million for Unum US voluntary life, and $20.1 million for Colonial Life voluntary life. The reserves established were attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

137

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 6 - Liability for Unpaid Claims and Claim Adjustment Expenses - Continued

2013 Group Life Waiver of Premium Benefit Reserve Reduction

Within our Unum US segment, we offer group life insurance coverage which consists primarily of renewable term life insurance and includes a provision for waiver of premium, if disabled. The group life waiver of premium benefit (group life waiver) provides for continuation of life insurance coverage when an insured, or the employer on behalf of the insured, is no longer paying premium because the employee is not actively at work due to a disability. The group life waiver claim reserve is the present value of future anticipated death benefits reflecting the probability of death while remaining disabled. Claim reserves are calculated using assumptions based on past experience adjusted for current trends and any other factors that would modify past experience and are subject to revision as current claim experience emerges and alters our view of future expectations. The two fundamental assumptions in the development of the group life waiver reserve are mortality and recovery. Our emerging experience and that which continues to emerge within the industry indicate an increase in life expectancies, which decreases the ultimate anticipated death benefits to be paid under the group life waiver benefit. Emerging experience also reflects an improvement in claim recovery rates, which also lessens the likelihood of payment of a death benefit while the insured is disabled. During the fourth quarter of 2013, we completed a review of our assumptions and modified our mortality and claim recovery assumptions for our Unum US group life waiver reserves and, as a result, reduced claim reserves by $85.0 million. Of this amount, approximately $78.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

2011 Long-term Care Loss Recognition

We generally perform loss recognition tests on our deferred acquisition costs and policy reserves in the fourth quarter of each year, but more frequently if appropriate, using best estimate assumptions as of the date of the test without a provision for adverse deviation. Included in our analysis for the long-term care product line during the fourth quarter of 2011 was a review of our reserve discount rate, mortality, and morbidity assumptions. Our analysis of reserve discount rate assumptions considered the significant decline in long-term interest rates which occurred late in 2011. We also considered an updated industry study for long-term care experience which was made available mid-year 2011 from the Society of Actuaries. Our analysis of this study, which was completed during the fourth quarter of 2011, showed that lower termination rates than we had previously assumed were beginning to emerge in industry and in our own company experience. Based on our analysis, as of December 31, 2011 we lowered the discount rate assumption to reflect the low interest rate environment and our expectation of future investment portfolio yield rates. We also changed our mortality assumptions to reflect emerging experience due to an increase in life expectancies which increases the ultimate number of people who will utilize long-term care benefits and also lengthens the amount of time a claimant receives long-term care benefits.  We changed our morbidity assumptions to reflect emerging industry experience as well as our own company experience. While our morbidity experience is still emerging and is not fully credible, we modified our assumptions to align more closely with the recently published industry study. Using our revised best estimate assumptions, as of December 31, 2011 we determined that deferred acquisition costs of $196.0 million were not recoverable and that our policy and claim reserves should be increased by $573.6 million to reflect our then current estimate of future benefit obligations. Of this amount, $248.1 million was related to claim reserves, and approximately $215.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

138

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 6 - Liability for Unpaid Claims and Claim Adjustment Expenses - Continued

2011 Claim Reserve Increase for Individual Disability Closed Block Business

In December 2011, we analyzed our reserve assumptions for individual disability closed block claim reserves. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and environmental changes and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business. At that time, we were able, with a higher degree of confidence, to assess our own experience for older ages in our long duration lifetime claim block as our data had become credible. There is very little industry experience for lifetime disability benefits, as our insurance companies were the primary disability companies in the insurance industry at the time lifetime disability benefits were offered. These benefits were offered during the 1980s and 1990s, recent enough such that claimants are just reaching the older ages and providing us with data to build our claim experience base. Emerging experience indicated a longer life expectancy for our older age, longer duration disabled claimants, which lengthens the time a claimant receives disability benefits. As a result of this experience, as of December 31, 2011 we adjusted our mortality assumption within our claim resolution rate assumption and, as a result, increased our claim reserves for our individual disability closed block of business by $183.5 million. Of this amount, approximately $176.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.  

Reconciliation

A reconciliation of policy and contract benefits and reserves for future policy and contract benefits as reported in our consolidated balance sheets to the liability for unpaid claims and claim adjustment expenses is as follows:

	December 31
	2013		2012		2011
	(in millions of dollars)
Policy and Contract Benefits	$	1,511.0	$	1,484.6	$	1,494.0
Reserves for Future Policy and Contract Benefits	43,099.1		44,694.4		43,051.9
Total	44,610.1		46,179.0		44,545.9
Less:
Life Reserves for Future Policy and Contract Benefits	7,740.5		7,571.1		7,454.2
Accident and Health Active Life Reserves	8,225.5		7,763.3		7,259.6
Unrealized Adjustment to Reserves for Future Policy and Contract Benefits	4,108.5		6,277.5		5,245.6
Liability for Unpaid Claims and Claim Adjustment Expenses	$	24,535.6	$	24,567.1	$	24,586.5

The unrealized adjustment to reserves for future policy and contract benefits reflects the changes that would be necessary to policyholder liabilities if the unrealized investment gains and losses related to the available-for-sale securities had been realized. Changes in this adjustment are reported as a component of other comprehensive income or loss.

139

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 7 - Income Tax

Total income tax expense (benefit) is allocated as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Net Income	$	347.1		$	355.1		$	49.1
Stockholders' Equity - Additional Paid-in Capital
Stock-Based Compensation	(0.8		)	3.5			(3.3		)
Stockholders' Equity - Accumulated Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment	(1,102.8		)	467.7			798.3
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	743.3			(325.6		)	(701.5		)
Change in Net Gain on Cash Flow Hedges	(1.3		)	(4.3		)	25.2
Change in Unrecognized Pension and Postretirement Benefit Costs	185.2			(68.0		)	(67.4		)
Total	$	170.7		$	428.4		$	100.4

A reconciliation of the income tax expense (benefit) attributable to income from operations before income tax, computed at U.S. federal statutory tax rates, to the income tax expense (benefit) as included in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
Statutory Income Tax	35.0	%	35.0	%	35.0	%
Prior Year Taxes	(0.1	)	(0.9	)	(11.0	)
Foreign Items	(1.9	)	(2.0	)	(0.3	)
Tax Credits	(3.4	)	(2.7	)	(5.9	)
Other Items, Net	(0.8	)	(1.0	)	(3.1	)
Effective Tax	28.8	%	28.4	%	14.7	%

Our net deferred tax liability consists of the following. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31
	2013		2012
	(in millions of dollars)
Deferred Tax Liability
Deferred Acquisition Costs	$	70.0	$	39.3
Fixed Assets	80.3		74.1
Invested Assets	1,274.3		2,342.8
Other	54.4		63.2
Gross Deferred Tax Liability	1,479.0		2,519.4
Deferred Tax Asset
Reserves	1,180.1		1,934.2
Employee Benefits	151.2		315.2
Other	3.4		0.6
Gross Deferred Tax Asset	1,334.7		2,250.0
Total Net Deferred Tax Liability	$	144.3	$	269.4

140

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 7 - Income Tax - Continued

Our consolidated statements of income include amounts subject to both domestic and foreign taxation. The income and related tax expense (benefit) are as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Income Before Tax
United States - Federal	$	1,072.0	$	1,128.4		$	160.5
Foreign	133.2		121.1			172.8
Total	$	1,205.2	$	1,249.5		$	333.3
Current Tax Expense
United States - Federal	$	277.9	$	164.4		$	218.4
Foreign	18.7		42.2			12.1
Total	296.6		206.6			230.5
Deferred Tax Expense (Benefit)
United States - Federal	47.3		173.5			(203.4		)
Foreign	3.2		(25.0		)	22.0
Total	50.5		148.5			(181.4		)
Total	$	347.1	$	355.1		$	49.1

The U.K. government enacted income tax rate reductions during each of the years 2010 through 2013. During 2013, the rate was reduced from 23 percent to 21 percent effective April 2014, and to 20 percent effective April 2015. Although the rate reductions in each instance became or will become effective during a subsequent year, we are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change.  As a result, we recorded income tax benefits of $6.3 million for the three percent tax rate reduction enacted during 2013 and $9.3 million and $6.8 million for the two percent tax rate reductions enacted during 2012 and 2011, respectively.

We consider the unremitted earnings of our foreign operations to be permanently invested and therefore have not provided U.S. deferred taxes on the cumulative earnings of our non-U.S. affiliates. Deferred taxes are provided for earnings of non-U.S. affiliates when we plan to remit those earnings. As of December 31, 2013, we have not made a provision for U.S. taxes on approximately $1 billion of the excess of the carrying amount for financial reporting over the tax basis of investments in foreign subsidiaries that are essentially permanent in duration. The determination of a deferred tax liability related to investments in these foreign subsidiaries is not practicable.

141

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 7 - Income Tax - Continued

Our consolidated statements of income include the following changes in unrecognized tax benefits:

	December 31
	2013			2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	17.5		$	86.9		$	138.9
Tax Positions Taken During Prior Years
Additions	5.7			13.3			4.4
Subtractions	—			(0.6		)	(11.8		)
Settlements with Tax Authorities	(4.8		)	(23.5		)	(44.6		)
Lapses of Statute of Limitations	—			(61.1		)	—
Tax Positions Taken During Current Year	—			2.5			—
Balance at End of Year	18.4			17.5			86.9
Less Tax Attributable to Temporary Items Included Above	(10.2		)	(15.0		)	(86.9		)
Total Unrecognized Tax Benefits that if Recognized Would Affect the Effective Tax Rate	$	8.2		$	2.5		$	—

Included in the balances at December 31, 2013, 2012, and 2011 are $10.2 million, $15.0 million, and $86.9 million, respectively, of unrecognized tax benefits for tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. Other than potential interest and penalties, the disallowance of the shorter deductibility period would not affect our results of operations but would accelerate the payment of cash to the taxing authority.

We recognize interest expense and penalties, if applicable, related to unrecognized tax benefits in tax expense net of federal income tax. We recognized a reduction of interest expense associated with unrecognized tax benefits of $1.1 million, $10.4 million, and $13.1 million for 2013, 2012, and 2011, respectively.  The total amounts of accrued interest and penalties related to unrecognized tax benefits in our consolidated balance sheets as of December 31, 2013 and 2012 were $0.8 million and $1.9 million, respectively. It is reasonably possible that unrecognized tax benefits could decrease within the next 12 months by $0 to $8.0 million pending resolution of items with the Internal Revenue Service (IRS).

We file federal and state income tax returns in the United States and in foreign jurisdictions. We are under continuous examination by the IRS with regard to our U.S. federal income tax returns. During 2013, our appeal of tax years 2005 and 2006 was effectively settled with the approval of the Congressional Joint Committee on Taxation. As a result of the settlement, we recognized in our 2013 operating results a reduction in federal income taxes of $1.4 million as well as other income of $4.0 million before tax and $2.6 million after tax. We expect to receive a cash refund of taxes and interest under this settlement of approximately $17.5 million in 2014.

During 2012, the IRS audit of our 2009 and 2010 years commenced, and we also finalized all issues with the IRS related to our 2007 and 2008 years resulting in a reduction of our federal income taxes of $11.0 million. During 2011, the IRS approved our final settlement for tax years 1996 to 2004.  The settlement resulted from our administrative appeal of audit adjustments relating primarily to insurance tax reserves and losses incurred by foreign subsidiaries.  As a result of the settlement, we recognized in our 2011 operating results a reduction in our federal income taxes of $41.3 million as well as interest income of $17.5 million before tax and $11.4 million after tax.  We received a cash refund of taxes and interest under this settlement of $60.4 million in 2012.

Tax years subsequent to 2008 remain subject to examination by tax authorities in the U.S., and tax years subsequent to 2010 remain subject to examination in major foreign jurisdictions. We believe sufficient provision has been made for all potential adjustments for years that are not closed by the statute of limitations in all major tax jurisdictions and that any such adjustments would not have a material adverse effect on our financial position, liquidity, or results of operations.

142

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 7 - Income Tax - Continued

In January 2013, the American Taxpayer Relief Act retroactively reinstated the active financing income exemption to the beginning of 2012 which affects the amount of earnings from foreign subsidiaries that is taxed annually, regardless of whether foreign earnings are repatriated. Our 2012 income tax expense reflected the taxation of all active financing income from our foreign subsidiaries as required under the law in place prior to the reinstatement. In 2013, we reversed the amounts recorded in 2012 and recorded a reduction in income tax expense of $0.9 million to reflect the reinstatement of the exemption of active financing income. The active financing income exemption expired again for tax years beginning on or after January 1, 2014, the effect of which is expected to be immaterial in 2014.

As of December 31, 2013 and 2012, we had no net operating loss carryforward for U.S. income taxes. We record a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized.  As of December 31, 2013 and 2012, we had no valuation allowance. In 2011, as part of an IRS settlement, we released a $4.1 million valuation allowance related to basis differences in foreign subsidiaries and net operating loss carryforwards in foreign jurisdictions.

Total income taxes paid net of refunds during 2013, 2012, and 2011 were $398.1 million, $185.0 million, and $303.5 million, respectively.

Note 8 - Debt

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Senior Secured Notes, variable due 2037, callable at or above par	$	440.0		$	500.0
Senior Secured Notes, variable due 2036, callable at or above par	—			62.5
Notes @ 5.75% due 2042, callable at or above par	248.6			248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 6.85% due 2015, callable at or above par	296.8			296.7
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	2,612.0			2,755.4
Short-term Debt
Securities Lending Agreements - See Note 3	76.5			455.8
Total	$	2,688.5		$	3,211.2

Collateralized debt is comprised of our senior secured notes and ranks highest in priority, followed by unsecured notes, which consist of notes and medium-term notes, followed by junior subordinated debt securities. The junior subordinated debt securities due 2038 are callable under limited, specified circumstances. The remaining callable debt may be redeemed, in whole or in part, at any time.

The aggregate contractual principal maturities are $296.9 million in 2015, $350.0 million in 2016, $200.0 million in 2018, and $1,772.6 million in 2020 and thereafter.

143

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 8 - Debt - Continued

Senior Secured Notes

In 2007, Northwind Holdings, LLC (Northwind Holdings), a wholly-owned subsidiary of Unum Group, issued $800.0 million of insured, senior secured notes due 2037 (the Northwind notes) in a private offering. The Northwind notes bear interest at a floating rate equal to the three-month LIBOR plus 0.78%.

Northwind Holdings’ ability to meet its obligations to pay principal, interest, and other amounts due on the Northwind notes will be dependent principally on its receipt of dividends from Northwind Reinsurance Company (Northwind Re), the sole subsidiary of Northwind Holdings. Northwind Re reinsured the risks attributable to specified individual disability insurance policies issued by or reinsured by Provident Life and Accident Insurance Company, Unum Life Insurance Company of America, and The Paul Revere Life Insurance Company (collectively, the ceding insurers) pursuant to separate reinsurance agreements between Northwind Re and each of the ceding insurers. The ability of Northwind Re to pay dividends to Northwind Holdings will depend on its satisfaction of applicable regulatory requirements and the performance of the reinsured policies.

Recourse for the payment of principal, interest, and other amounts due on the Northwind notes is limited to the collateral for the Northwind notes and the other assets, if any, of Northwind Holdings. The collateral consists of a first priority, perfected security interest in (a) the debt service coverage account (DSCA) that Northwind Holdings is required to maintain in accordance with the indenture pursuant to which the Northwind notes were issued (the Northwind indenture), (b) the capital stock of Northwind Re and the dividends and distributions on such capital stock, and (c) Northwind Holdings' rights under the transaction documents related to the Northwind notes to which Northwind Holdings is a party. At December 31, 2013, the amount in the DSCA was $7.4 million. None of Unum Group, the ceding insurers, Northwind Re, or any other affiliate of Northwind Holdings is an obligor or guarantor with respect to the Northwind notes.

Northwind Holdings is required to repay a portion of the outstanding principal under the Northwind notes at par on the quarterly scheduled payment dates under the Northwind notes in an amount equal to the lesser of (i) a targeted amortization amount as defined in the Northwind indenture and (ii) the amount of the remaining available funds in the DSCA minus an amount equal to the minimum balance that is required to be maintained in the DSCA under the Northwind indenture, provided that Northwind Holdings has sufficient funds available to pay its other expenses, including interest payments on the Northwind notes, and to maintain the minimum balance in the DSCA as required under the Northwind indenture. Northwind Holdings made principal payments on the Northwind Notes of $60.0 million in both 2013 and 2012 and $74.4 million in 2011.

In 2006, Tailwind Holdings, LLC (Tailwind Holdings) a wholly-owned subsidiary of Unum Group, issued $130.0 million of insured, senior, secured notes due 2036 in a private offering. During 2012 and 2011, Tailwind Holdings made principal payments of $10.0 million each year on these notes. In January 2013, we purchased and retired the outstanding principal of $62.5 million on these notes, resulting in a before-tax gain of $4.0 million.

Unsecured Notes

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering.

In 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

In 2005, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued 6.85% senior debentures due 2015. These debentures are fully and unconditionally guaranteed by Unum Group.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $600.0 million notional amount interest rate swaps which effectively convert certain of our unsecured senior notes into floating rate debt. Under these agreements, we receive fixed rates of interest and pay variable rates of interest, based off of three-month LIBOR. See Note 4 for further information on our interest rate swaps.

144

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 8 - Debt - Continued

Junior Subordinated Debt Securities

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures to the trust in connection with the capital securities offering. The debentures mature in 2038. The sole assets of the trust are the junior subordinated debt securities.

Interest and Debt Expense

Interest paid on long-term and short-term debt and related securities during 2013, 2012, and 2011 was $144.6 million, $139.6 million, and $145.4 million, respectively.

Credit Facility

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600.0 million. Borrowings under the credit facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility provides for interest rates based on either the prime rate or LIBOR. At December 31, 2013, no amount was outstanding on the facility.

Note 9 - Employee Benefit Plans

Defined Benefit Pension and Other Postretirement Benefit Plans

We sponsor several defined benefit pension and other postretirement benefit (OPEB) plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, and the U.K. plan was closed to new entrants on December 31, 2002.

Amendments to U.S. Pension Plans

In 2013, we adopted plan amendments which freeze participation and benefit accruals in our U.S. qualified and non-qualified defined benefit pension plans, effective December 31, 2013. Because the amendments eliminate all future service accruals subsequent to December 31, 2013 for active participants in these plans, we were required to remeasure the benefit obligations during 2013. The discount rate assumption increased from 4.50 percent at December 31, 2012 to 5.00 percent at the remeasurement date, reflecting the change in market interest rates during that period. The expected long-term rate of return on plan assets of 7.50 percent remained unchanged from December 31, 2012. The remeasurement resulted in a decrease in our net pension liability of $327.4 million at the remeasurement date, with a corresponding increase in other comprehensive income, less applicable income tax of $114.6 million. The decrease in the net pension liability resulted primarily from the curtailment of benefits under the plan amendments as well as the increase in the discount rate assumption used to remeasure the benefit obligations.

As a result of these plan amendments, we recognized a before-tax curtailment loss of $0.7 million in earnings during 2013, with a corresponding reduction in the prior service cost included in accumulated other comprehensive income and associated with years of service no longer expected to be rendered.

145

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

Amendments to U.K. Pension Plan

In 2013, we adopted amendments to our U.K. pension plan which freeze participation in our plan and which reduce the maximum rate of inflation indexation from 5.0 percent to 2.5 percent for pension benefits which were earned prior to April 1997. The amendment to reduce the maximum rate of inflation indexation was effective September 12, 2013, and the amendment to freeze participation will become effective June 30, 2014. Although all future service accruals will be eliminated for active participants, pension payments to participants currently employed will be based on the higher of (i) pensionable earnings at a participant's retirement age or the date a participant's employment ceases, subject to the inflation indexation provisions in the plan, or (ii) pensionable earnings as of June 30, 2014, also subject to the inflation indexation provisions. Because the amendments eliminate all future service accruals subsequent to June 30, 2014 for active participants in the plan, we were required to remeasure the benefit obligation of the plan during 2013. The discount rate assumption increased from 4.50 percent at December 31, 2012 to 4.60 percent at the remeasurement date, reflecting the change in market interest rates during that period. The expected long-term rate of return on plan assets changed from 6.20 percent at December 31, 2012 to 6.35 percent at the remeasurement date. The remeasurement resulted in a $2.3 million, or £1.5 million, increase in our net pension asset at the remeasurement date.

As a result of these plan amendments, we recognized a before-tax curtailment gain of $3.7 million, or £2.3 million, in earnings during 2013, with a corresponding decrease in the prior service credit included in accumulated other comprehensive income and associated with years of service no longer expected to be rendered. The majority of the prior service credit was related to the amendment to reduce the rate of inflation indexation.

Amendments to OPEB Plan

We discontinued offering retiree life insurance to future retirees effective December 31, 2012 but continue to provide this benefit to employees who retired prior to that date. As a result of this plan amendment, we recognized a curtailment gain of $4.2 million and a prior service credit of $5.0 million in accumulated other comprehensive income during 2012.

Amortization Period of Actuarial Gain or Loss

Because all participants in the U.S. and U.K. pension plans are considered inactive as a result of these amendments, we are required to amortize the net actuarial loss for these plans over the average remaining life expectancy of the plan participants. The net actuarial loss was previously amortized over the average future working life of pension plan participants, or approximately 11 years, for both U.S. and U.K. participants up to the dates of remeasurement. As of December 31, 2013, the estimate of the average remaining life expectancy of plan participants is approximately 33 years for U.S. participants and 34 years for U.K. participants.

146

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The following tables provide the changes in the benefit obligation and fair value of plan assets and statements of the funded status of the plans.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Change in Benefit Obligation
Benefit Obligation at Beginning of Year	$	1,967.9		$	1,579.8		$	197.4		$	170.4		$	198.8		$	190.9
Service Cost	59.4			48.8			4.3			4.2			0.7			1.6
Interest Cost	86.3			84.4			8.6			8.5			8.0			9.6
Plan Participant Contributions	—			—			—			—			3.9			3.5
Actuarial (Gain) Loss	(225.9		)	291.4			2.6			9.4			(30.2		)	19.1
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Plan Amendment	—			—			—			—			—			(5.0		)
Curtailment	(126.8		)	—			(3.7		)	—			—			(4.2		)
Change in Foreign Exchange Rates	—			—			3.6			8.8			—			—
Benefit Obligation at End of Year	$	1,718.7		$	1,967.9		$	208.7		$	197.4		$	165.3		$	198.8
Accumulated Benefit Obligation at December 31	$	1,718.7		$	1,822.3		$	197.7		$	187.3		N/A			N/A
Change in Fair Value of Plan Assets
Fair Value of Plan Assets at Beginning of Year	$	1,353.6		$	1,170.8		$	205.6		$	188.0		$	11.5		$	11.7
Actual Return on Plan Assets	224.6			161.8			15.6			8.6			0.2			0.3
Employer Contributions	54.7			57.5			4.0			4.1			11.7			12.7
Plan Participant Contributions	—			—			—			—			3.9			3.5
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Change in Foreign Exchange Rates	—			—			4.6			8.8			—			—
Fair Value of Plan Assets at End of Year	$	1,590.7		$	1,353.6		$	225.7		$	205.6		$	11.4		$	11.5
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9		$	187.3

147

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The amounts recognized in our consolidated balance sheets for our pension and OPEB plans at December 31, 2013 and 2012 are as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013		2012
	(in millions of dollars)
Current Liability	$	5.2		$	4.6		$	—		$	—		$	14.6	$	15.6
Noncurrent Liability	136.2			609.7			—			—			139.3		171.7
Noncurrent Asset	(13.4		)	—			(17.0		)	(8.2		)	—		—
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9	$	187.3
Unrecognized Pension and Postretirement Benefit Costs
Net Actuarial Gain (Loss)	$	(342.1	)	$	(845.4	)	$	(36.9	)	$	(37.9	)	$	10.3	$	(19.3	)
Prior Service Credit (Cost)	—			(0.6		)	—			(0.2		)	2.4		7.3
	(342.1		)	(846.0		)	(36.9		)	(38.1		)	12.7		(12.0		)
Deferred Income Tax Asset	119.7			296.1			10.9			11.1			5.8		14.4
Total Included in Accumulated Other Comprehensive Income (Loss)	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5	$	2.4

The following table provides the changes recognized in other comprehensive income for the years ended December 31, 2013 and 2012.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	$	(549.9	)	$	(437.6	)	$	(27.0	)	$	(17.2	)	$	2.4		$	10.7
Net Actuarial Gain (Loss)
Amortization	31.7			45.9			1.2			0.5			—			—
Curtailment	126.8			—			—			—			—			4.2
All Other Changes	344.8			(218.2		)	(0.2		)	(13.4		)	29.6			(19.4		)
Prior Service Credit (Cost)
Amortization	(0.1		)	(0.4		)	—			—			(4.9		)	(2.6		)
Curtailment	0.7			—			(3.7		)	—			—			—
Plan Amendment	—			—			3.9			—			—			5.0
Change in Deferred Income Tax Asset	(176.4		)	60.4			(0.2		)	3.1			(8.6		)	4.5
Accumulated Other Comprehensive Income (Loss) at End of Year	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5		$	2.4

148

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

Plan Assets

The objective of our U.S. pension and OPEB plans is to maximize long-term return, within acceptable risk levels, in a manner that is consistent with the fiduciary standards of the Employee Retirement Income Security Act (ERISA), while maintaining sufficient liquidity to pay current benefits and expenses.

Assets for our U.S. pension plans include a diversified blend of domestic and international large cap, mid cap, and small cap equity securities, U.S. government and agency fixed income securities, corporate fixed income securities, private equity direct investments, private equity funds of funds, hedge funds of funds, and cash equivalents. The large cap and mid cap equity securities are comprised of equity index funds that are designed to track the Standard & Poor's (S&P) 500 and S&P 400 Mid Cap indices, respectively. Small cap equity securities consist of individual equity securities that track the Russell 2000 index. International equity investments consist of equity funds that are benchmarked against either the Morgan Stanley Capital International (MSCI) Europe Australasia Far East Index or the MSCI All Country World Index Excluding U.S. These international funds may allocate a certain percentage of their assets to forward currency contracts. Emerging market equity investments consist of funds that are benchmarked against the MSCI Emerging Markets Index. U.S. government and agency fixed income securities are comprised of treasury bonds and U.S. agency asset-backed securities. Corporate fixed income securities consist of investment-grade and below-investment-grade corporate bonds as well as certain asset-backed securities. Alternative investments, which include private equity direct investments, private equity funds of funds, and hedge funds of funds, utilize proprietary strategies that are intended to have a low correlation to the U.S. stock market. The target allocations for invested assets are 60 percent equity securities, 30 percent fixed income securities, and 10 percent alternative investments. Prohibited investments include, but are not limited to, unlisted securities, futures contracts, options, short sales, and investments in securities issued by the Company or its affiliates.

Assets for our U.K. pension plan are primarily invested in a pooled diversified growth fund. This fund invests in assets such as global equities, hedge funds, commodities, below-investment-grade fixed income securities, and currencies. The objectives of the fund are to generate capital appreciation over the course of a complete economic and market cycle and to deliver equity-like returns in the medium-to-long term while maintaining approximately two thirds of the volatility of equity markets. Performance of this fund is measured against the U.K. inflation rate plus four percent. The remaining assets in the U.K. plan are invested in leveraged interest rate and inflation swap funds of varying durations designed to broadly match the interest rate and inflation sensitivities of the plan's liabilities. The current target allocation for the assets is 75 percent diversified growth assets and 25 percent interest rate and inflation swap funds. There are no categories of investments that are specifically prohibited by the U.K. plan, but there are general guidelines that ensure prudent investment action is taken. Such guidelines include the prevention of the plan from using derivatives for speculative purposes and limiting the concentration of risk in any one type of investment.

Assets for life insurance benefits payable to certain former retirees covered under the OPEB plan are invested in life insurance contracts issued by one of our insurance subsidiaries. The terms of these contracts are consistent in all material respects with those the subsidiary offers to unaffiliated parties that are similarly situated. There are no categories of investments specifically prohibited by the OPEB plan.

We believe our investment portfolios are well diversified by asset class and sector, with no potential risk concentrations in any one category.

149

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The categorization of fair value measurements by input level for the invested assets in our U.S. pension plans is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	343.9	$	—	$	343.9
U.S. Mid Cap	—		139.6		—		139.6
U.S. Small Cap	231.9		—		—		231.9
International	134.5		131.7		—		266.2
Emerging Markets	—		76.3		—		76.3
Fixed Income Securities:
U.S. Government and Agencies	105.7		7.4		—		113.1
Corporate	97.8		172.6		—		270.4
State and Municipal Securities	—		12.9		—		12.9
Alternative Investments:
Private Equity Direct Investments	—		—		7.2		7.2
Private Equity Funds of Funds	—		—		29.6		29.6
Hedge Funds of Funds	—		—		66.9		66.9
Cash Equivalents	28.4		—		—		28.4
Total	$	598.3	$	884.4	$	103.7	$	1,586.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	269.2	$	—	$	269.2
U.S. Mid Cap	—		111.6		—		111.6
U.S. Small Cap	83.9		120.1		—		204.0
International	106.4		102.9		—		209.3
Emerging Markets	—		73.9		—		73.9
Fixed Income Securities:
U.S. Government and Agencies	138.0		8.6		—		146.6
Corporate	84.1		141.7		—		225.8
State and Municipal Securities	—		12.7		—		12.7
Alternative Investments:
Private Equity Funds of Funds	—		—		28.7		28.7
Hedge Funds of Funds	—		—		56.1		56.1
Cash Equivalents	13.1		—		—		13.1
Total	$	425.5	$	840.7	$	84.8	$	1,351.0

150

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

Level 1 equity and fixed income securities consist of individual holdings and funds that are valued based on unadjusted quoted prices from active markets for identical securities. Level 2 equity securities consist of funds that are valued based on the net asset value (NAV) of the underlying holdings. These investments have no unfunded commitments and no specific redemption restrictions. Level 2 fixed income securities are valued using observable inputs through market corroborated pricing.

Alternative investments, which include private equity direct investments, hedge funds of funds, and private equity funds of funds, are valued based on the NAV of the underlying holdings in a period ranging from one month to one quarter in arrears. We evaluate the need for adjustments to the NAV based on market conditions and discussions with fund managers in the period subsequent to the valuation date and prior to issuance of the financial statements. We made no adjustments to the NAV for 2013 or 2012. Redemptions on the hedge funds of funds can be made on either a quarterly or bi-annual basis, depending on the fund, with prior notice of at least 90 calendar days. Because of these redemption restrictions, we have classified the hedge funds of funds as Level 3 because we do not have the unrestricted ability to redeem our investment at NAV at any given time. The private equity funds of funds cannot be redeemed by investors, and distributions are received following the maturity of the underlying assets. It is estimated that these underlying assets will begin to mature between five and eight years from the date of initial investment. Accordingly, we have assigned a Level 3 classification to the private equity funds of funds due to the redemption restrictions.

Changes in our U.S. pension plans' assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Direct Investments	$	—	$	0.3	$	—	$	8.4	$	(1.5	)	$	—	$	—	$	7.2
Private Equity Funds of Funds	28.7		0.9		1.1		2.1		(3.2		)	—		—		29.6
Hedge Funds of Funds	56.1		6.3		—		4.9		(0.4		)	—		—		66.9
Total	$	84.8	$	7.5	$	1.1	$	15.4	$	(5.1	)	$	—	$	—	$	103.7

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Funds of Funds	$	23.7	$	0.5	$	1.0	$	6.0	$	(2.5	)	$	—	$	—	$	28.7
Hedge Funds of Funds	44.3		3.8		—		11.8		(3.8		)	—		—		56.1
Total	$	68.0	$	4.3	$	1.0	$	17.8	$	(6.3	)	$	—	$	—	$	84.8

151

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The categorization of fair value measurements by input level for the assets in our U.K. pension plan is as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	172.0	$	—	$	172.0
Fixed Interest and Index-linked Securities	52.6		0.4		—		53.0
Cash Equivalents	0.7		—		—		0.7
Total Plan Assets	$	53.3	$	172.4	$	—	$	225.7

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	154.7	$	—	$	154.7
Fixed Interest and Index-linked Securities	42.6		0.9		—		43.5
Cash Equivalents	7.4		—		—		7.4
Total Plan Assets	$	50.0	$	155.6	$	—	$	205.6

Level 1 fixed interest and index-linked securities consist of individual funds that are valued based on unadjusted quoted prices from active markets for identical securities. Level 2 assets consist of funds that are valued based on the NAV of the underlying holdings. These investments have no unfunded commitments and no specific redemption restrictions.

The categorization of fair value measurements by input level for the assets in our OPEB plan is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.4	$	11.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.5	$	11.5

152

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The fair value is represented by the actuarial present value of future cash flows of the contracts.

Changes in our OPEB plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.5	$	0.2	$	15.6	$	(15.9	)	$	11.4

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.7	$	0.3	$	16.2	$	(16.7	)	$	11.5

For the years end December 31, 2013 and 2012, the actual return on plan assets relates solely to investments still held at the reporting date. There were no transfers into or out of Level 3 during 2013 or 2012.

Measurement Assumptions

We use a December 31 measurement date for each of our plans. The weighted average assumptionsused in the measurement of our benefit obligations as of December 31 and our net periodic benefit costs for the years ended December 31 are as follows:

	Pension Benefits
	U.S. Plans				Non U.S. Plans				OPEB
	2013		2012		2013		2012		2013		2012
Benefit Obligations
Discount Rate	5.30	%	4.50	%	4.40	%	4.50	%	5.00	%	4.20	%
Rate of Compensation Increase	4.00	%	4.00	%	3.90	%	3.75	%	—	%	—	%
Net Periodic Benefit Cost
Discount Rate	4.50% / 5.00%*		5.40	%	4.50% / 4.60%**		4.90	%	4.20	%	5.20	%
Expected Return on Plan Assets	7.50	%	7.50	%	6.20% / 6.35%**		5.80	%	5.75	%	5.75	%
Rate of Compensation Increase	4.00	%	4.00	%	3.75	%	3.85	%	—	%	—	%

*In conjunction with the remeasurement due to the amendment of the plans, a discount rate of 4.50% was used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 5.00% was used for the period subsequent to the date of remeasurement through December 31, 2013.

**In conjunction with the remeasurement due to the amendment of the plan, a discount rate of 4.50% and expected return on plan assets of 6.20% were used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 4.60% and expected return on plan assets of 6.35% were used for the period subsequent to the date of remeasurement through December 31, 2013.

We set the discount rate assumption annually for each of our retirement-related benefit plans at the measurement date to reflect the yield on a portfolio of high quality fixed income corporate debt instruments matched against the projected cash flows for future benefits.

Our long-term rate of return on plan assets assumption is an estimate, based on statistical analysis, of the average annual assumed return that will be produced from the plan assets until current benefits are paid. The market-related value equals the fair value of assets, determined as of the measurement date.  Our expectations for the future investment returns of the asset categories were based on a combination of historical market performance and evaluations of investment forecasts obtained from external consultants and economists.

153

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

The methodology underlying the return assumption included the various elements of the expected return for each asset class such as long-term rates of return, volatility of returns, and the correlation of returns between various asset classes. The expected return for the total portfolio was calculated based on the plan's strategic asset allocation.  Investment risk is measured and monitored on an ongoing basis through annual liability measurements, periodic asset/liability studies, and quarterly investment portfolio reviews.  Risk tolerance is established through consideration of plan liabilities, plan funded status, and corporate financial condition.

The expected return assumption for the life insurance reserve for our OPEB plan at December 31, 2013 and 2012 was 5.75 percent, which was based on full investment in fixed income securities with an average book yield of 5.58 percent and 5.77 percent in 2013 and 2012, respectively.

Our rate of compensation increase assumption is generally based on periodic studies of compensation trends.

For measurement purposes at December 31, 2013 and 2012, the annual rate of increase in the per capita cost of covered postretirement health care benefits assumed for the next calendar year was 7.50 percent and 8.00 percent, respectively, for benefits payable to both retirees prior to Medicare eligibility as well as Medicare eligible retirees. The rate was assumed to change gradually to 5.00 percent by 2019 and remain at that level thereafter.

The medical and dental premium used to determine the per retiree employer subsidy are capped. If the cap is not reached by the year 2015, the caps are then set equal to the year 2015 premium. Certain of the current retirees and all future retirees are subject to the cap.

Net Periodic Benefit Cost

The following table provides the components of the net periodic benefit cost for the plans described above for the years ended December 31.

	Pension Benefits
	U.S. Plans									Non U.S. Plans									OPEB
	2013			2012			2011			2013			2012			2011			2013			2012			2011
	(in millions of dollars)
Service Cost	$	59.4		$	48.8		$	42.7		$	4.3		$	4.2		$	4.8		$	0.7		$	1.6		$	1.9
Interest Cost	86.3			84.4			77.6			8.6			8.5			8.8			8.0			9.6			10.0
Expected Return on Plan Assets	(105.5		)	(88.8		)	(87.6		)	(12.5		)	(11.1		)	(12.2		)	(0.6		)	(0.7		)	(0.7		)
Amortization of:
Net Actuarial Loss	31.7			45.9			31.9			1.2			0.5			—			—			—			—
Prior Service Credit	(0.1		)	(0.4		)	(0.5		)	—			—			—			(4.9		)	(2.6		)	(2.6		)
Curtailment	0.7			—			—			(3.7		)	—			—			—			—			—
Total	$	72.5		$	89.9		$	64.1		$	(2.1	)	$	2.1		$	1.4		$	3.2		$	7.9		$	8.6

A one percent increase or decrease in the assumed health care cost trend rate at December 31, 2013 would have increased (decreased) the service cost and interest cost by $0.2 million and $(0.1) million, respectively, and the postretirement benefit obligation by $2.4 million and $(1.7) million, respectively.

154

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

Our OPEB plan currently receives a subsidy from the federal government under the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (the Medicare Act). This act allows an employer to choose whether to coordinate prescription drug benefits under a retiree medical plan with the Medicare prescription drug benefit or to keep the company plan design as it is and receive a subsidy from the federal government. When the Medicare Act became effective in 2006, we initially elected to receive the subsidy from the federal government with plans to defer our coordination with the new prescription drug benefit until a later date. This anticipated change was reflected in the net periodic benefit cost. In 2009, we amended the plan design to stop the deferral of coordination of benefits and elected to continue receiving the existing subsidy from the federal government. This election resulted in a $4.4 million prior service credit that began amortization in 2010. We received subsidy payments of $1.2 million, $1.3 million, and $1.3 million in 2013, 2012, and 2011, respectively. Our expected benefit payments in future years have been reduced by the amount of subsidy payments we expect to receive.

The unrecognized net actuarial loss and prior service credit included in accumulated other comprehensive income and expected to be amortized and included in net periodic pension cost for our pension plans during 2014 is $5.6 million before tax and $3.7 million after tax. The prior service credit expected to be amortized and included as a reduction to net periodic cost for our OPEB plan during 2014 is $1.7 million before tax and $1.1 million after tax.

Benefit Payments

The following table provides expected benefit payments, which reflect expected future service, as appropriate.

	Pension Benefits
	U.S. Plans		Non U.S. Plans		OPEB
	(in millions of dollars)
Year					Gross		Subsidy Payments		Net
2014	$	45.1	$	5.4	$	16.4	$	1.8	$	14.6
2015	49.3		5.8		16.4		1.9		14.5
2016	54.6		6.1		16.2		2.1		14.1
2017	59.4		6.4		15.9		2.2		13.7
2018	64.7		6.7		15.6		2.4		13.2
2019-2023	421.9		38.9		70.3		14.2		56.1

Pension Plans' Funding Policy

The funding policy for our U.S. qualified defined benefit plan is to contribute annually an amount at least equal to the minimum annual contribution required under ERISA and other applicable laws, but generally not greater than the maximum amount that can be deducted for federal income tax purposes. We had no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013. We elected to make a voluntary contribution of $50.0 million to this plan during 2013 but do not expect to make any contributions during 2014. The funding policy for our U.S. non-qualified defined benefit pension plan is to contribute the amount of the benefit payments made during the year. Our expected return on plan assets and discount rate will not affect the cash contributions we are required to make to our U.S. pension and OPEB plans because we have met all minimum funding requirements required under ERISA.

We made required contributions to our U.K. plan of $4.0 million, or approximately £2.5 million, during December 31, 2013. Effective October 1, 2013, we increased contributions to the U.K. plan from 24.8 percent to 30.0 percent of pensionable earnings for plan participants. We expect to make contributions of approximately $2.3 million, or £1.4 million, during 2014. Subsequent to June 30, 2014, we may make voluntary contributions in the future as is deemed necessary. We contribute to our U.K. pension plan sufficient to meet the minimum funding requirements under U.K. legislation.

Our OPEB plan represents a non-vested, non-guaranteed obligation, and current regulations do not require specific funding levels for these benefits, which are comprised of retiree life, medical, and dental benefits. It is our practice to use general assets to pay medical and dental claims as they come due in lieu of utilizing plan assets for the medical and dental benefit portions of our OPEB plan.

155

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 9 - Employee Benefit Plans - Continued

Defined Contribution Plans

We offer a 401(k) plan to all eligible U.S. employees under which a portion of employee contributions is matched. Concurrent with the adoption of our U.S. pension plan amendments, we adopted an amendment to increase the benefits under our 401(k) plan, effective January 1, 2014, to match dollar-for dollar up to 5.0 percent of base salary. We previously matched dollar-for-dollar up to 3.0 percent of base salary and $0.50 on the dollar for each of the next 2.0 percent of base salary for employee contributions into the 401(k) plan. Also effective January 1, 2014, we will include any performance-based incentive compensation as part of the definition of earnings for purposes of contributions. We will also establish a new component of the 401(k) plan wherein we will make an additional non-elective contribution of 4.5 percent of earnings for all eligible employees, and a separate transition contribution will be made for eligible employees who meet certain age and years of service criteria. These changes are in compliance with ERISA guidelines, and the 401(k) plan will continue to qualify for a “safe harbor” from annual discrimination testing.

We also offer a defined contribution plan to all eligible U.K. employees under which a portion of employee contributions is matched. Concurrent with the adoption of our U.K. pension plan amendments, we adopted an amendment to increase the benefits under our U.K. defined contribution plan. Effective July 1, 2014, we will increase benefits under the defined contribution plan wherein we will match two pounds for every one pound on the first 1.0 percentof employee contributions into the plan and will match additional employee contributions pound-for-pound up to 5.0 percent of base salary. We previously matched pound-for-pound up to 5.0 percent of base salary for employee contributions into the defined contribution plan and made an additional non-elective contribution of 5.0 percent of base salary. Also effective July 1, 2014, we will increase the non-elective contribution to 6.0 percent of base salary for all eligible employees, and a separate transition contribution will be made for all eligible employees through March 31, 2016.

During the years ended December 31, 2013, 2012, and 2011, we contributed $18.8 million, $18.9 million, and $18.8 million, respectively, to our U.S. defined contribution plan, and $2.9 million, $2.9 million, and $2.6 million, or £1.9 million, £1.8 million, and £1.6 million, respectively, to our U.K. defined contribution plan.

Note 10 - Stockholders' Equity and Earnings Per Common Share

Earnings Per Common Share

Net income per common share is determined as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	858.1	$	894.4	$	284.2
Denominator (000s)
Weighted Average Common Shares - Basic	264,725.8		281,355.9		302,399.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,223.4		400.9		1,171.2
Weighted Average Common Shares - Assuming Dilution	265,949.2		281,756.8		303,571.0
Net Income Per Common Share
Basic	$	3.24	$	3.18	$	0.94
Assuming Dilution	$	3.23	$	3.17	$	0.94

156

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 10 - Stockholders' Equity and Earnings Per Common Share - Continued

We use the treasury stock method to account for the effect of outstanding stock options, nonvested restricted stock units, and nonvested performance share units on the computation of diluted earnings per share. Under this method, these potential common shares will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the exercise price of the stock options and the grant price of the nonvested restricted stock units and the nonvested performance share units. The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested restricted stock units have grant prices ranging from $19.38 to $32.35, and the nonvested performance share units have a grant price of $23.97. See Note 11.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of diluted earnings per share because their impact would be antidilutive, based on then current market prices, approximated 0.1 million, 2.5 million, and 2.1 million shares of common stock for the years ended December 31, 2013, 2012, and 2011, respectively.

Common Stock

Our board of directors has authorized the repurchase of Unum Group's common stock under the following repurchase programs:

	Share Repurchase Program Authorized During
	December 2013		July 2012		February 2011		May 2010
	(in millions of dollars)
Authorized Repurchase Amount	$	750.0	$	750.0	$	1,000.0	$	500.0
Remaining Repurchase Amount at Year End 2013	$	730.0	$	—	$	—	$	—

The December 2013 share repurchase program has an expiration date of June 12, 2015.

Common stock repurchases were classified as follows in our consolidated statements of stockholders' equity:

	Year Ended December 31
	2013			2012			2011
	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
Treasury Stock	11.2	$	318.6	23.6	$	500.6	17.7	$	419.9
Retirement of Common Shares	—	—		—	—		7.7	200.0
Total	11.2	$	318.6	23.6	$	500.6	25.4	$	619.9

The cost in the preceding chart includes commissions of $0.2 million, $0.6 million, and $0.3 million for the years ended December 31, 2013, 2012, and 2011, respectively.

In February 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock at our option. The final price adjustment settlement occurred in March 2011, resulting in the delivery to us of 0.6 million additional shares. We retired 7.7 million shares during 2011. All other repurchased shares have been classified as treasury stock.

Preferred Stock

Unum Group has 25,000,000 shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

157

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 11 - Stock-Based Compensation

Description of Stock Plans

Under the stock incentive plan of 2012 (the 2012 Plan), up to 20 million shares of common stock are available for awards to our employees, officers, consultants, and directors.  Awards may be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, performance share units, and other stock-based awards.  Each full-value award, defined as any award other than a stock option or stock appreciation right, is counted as 1.76 shares. The exercise price for stock options issued cannot be less than the fair value of the underlying common stock as of the grant date. Stock options generally have a term of eight years after the date of grant and vest after three years.  At December 31, 2013, approximately 18.31 million shares were available for future grants under the 2012 Plan.

Under the stock incentive plan of 2007 (the 2007 Plan), which was terminated in May 2012 for purposes of any further grants, up to 35 million shares of common stock were available for awards to our employees, officers, consultants, and directors. Awards could be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, performance share units, and other stock-based awards.  Each full-value award, defined as any award other than a stock option or stock appreciation right, is counted as 2.7 shares. Awards granted before the termination of the 2007 Plan remain outstanding in accordance with the plan's terms. Stock options generally have a term of eight years after the date of grant and vest after three years. 

We issue new shares of common stock for all of our stock plan vestings and exercises.

Performance Share Units (PSUs)

In February 2013, we issued approximately 0.1 million PSUs with a grant date fair value of $25.26, all of which were outstanding and nonvested at December 31, 2013. Vesting for the PSUs occurs at the end of a three-year period and is contingent upon our achievement of prospective company performance goals and our total shareholder return relative to a particular peer group during the three-year period. Forfeitable dividend equivalents on PSUs are accrued in the form of additional PSUs. The weighted average grant date fair value per share for PSU grants and dividends during 2013 was $25.26.

AtDecember 31, 2013, we had approximately $2.1 million of unrecognized compensation cost related to PSUs that will be recognized over a weighted average period of 2.0 years. The expense and unrecognized compensation cost assume the performance goals are attained at 100 percent. Actual performance, including modification for relative total shareholder return, may result in0 to 180 percentof the PSUs ultimately being earned. Compensation expense recognized for the PSUs is adjusted quarterly based on actual performance measure results.

We estimated the fair value on the date of initial grant for the PSUs using the Monte-Carlosimulation model. The following assumptions were used to value the grant:

• Expected volatility of 35 percent, based on our historical daily stock prices and those for components of our peer group.

• Expected life of 3.0 years, which equals the performance period.

• Expected dividend yield of 2.17 percent, assuming continuous reinvestment of the dividends, based on the plan's provisions.

• Risk free interest rate of 0.38 percent, based on the yield of U.S. Treasury bonds at the date of grant.

158

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 11 - Stock-Based Compensation - Continued

Restricted Stock Units (RSUs)

Activity for RSUs classified as equity is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	1,403		$	23.57
Granted	731		24.68
Vested	(790	)	23.12
Forfeited	(22	)	24.22
Outstanding at December 31, 2013	1,322		24.35

During 2013, 2012, and 2011, we issued RSUs with a weighted average grant date fair value per share of $24.68, $22.96, and $26.13, respectively.  RSUs vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period.  Forfeitable dividend equivalents on RSUs are accrued in the form of additional RSUs. Compensation cost for RSUs subject to accelerated vesting upon retirement is recognized over the implicit service period. 

The total fair value of shares vested during 2013, 2012, and 2011 was $18.3 million, $19.5 million, and $19.2 million, respectively. At December 31, 2013, we had $10.6 million of unrecognized compensation cost related to RSUs that will be recognized over a weighted average period of 0.8 years.

Cash-Settled Awards

Activity for cash-settled awards classified as a liability is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	207		$	23.72
Granted	60		24.22
Vested	(102	)	23.29
Outstanding at December 31, 2013	165		24.09

Cash-settled awards vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period.  Forfeitable dividend equivalents on cash-settled awards are accrued in the form of additional units.  Compensation cost for cash-settled awards subject to accelerated vesting upon retirement is recognized over the implicit service period.

The amount payable per unit awarded is equal to the price per share of Unum Group's common stock at settlement of the award, and as such, we measure the value of the award each reporting period based on the current stock price. The effects of changes in the stock price during the service period are recognized as compensation cost over the service period. Changes in the amount of the liability due to stock price changes after the service period are recognized as compensation cost during the period in which the changes occur.

The weighted average grant date fair value per unit for cash-settled awards granted during 2013, 2012, and 2011 was $24.22, $23.23, and $26.22, respectively.  The total fair value of cash-settled awards vested during 2013, 2012, and 2011 was $2.4 million, $1.5 million, and $0.7 million, respectively, and the total fair value of cash-settled awards paid during 2013, 2012, and 2011 was $2.5 million, $1.5 million, and $0.9 million, respectively. There is no unrecognized compensation cost related to the cash-settled awards, other than future changes in the liability due to future stock price changes, as the units do not require additional future service.

159

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 11 - Stock-Based Compensation - Continued

Stock Options

Stock option activity is summarized as follows:

					Remaining	Intrinsic
	Shares		Weighted Average		Contractual Term	Value
	(000s)		Exercise Price		(in years)	(in millions)
Outstanding at December 31, 2012	1,691		$	20.98
Granted	103		24.25
Exercised	(399	)	21.15
Outstanding at December 31, 2013	1,395		21.17		4.2	$	19.4
Exercisable at December 31, 2013	1,041		$	20.15	3.5	$	15.5

All outstanding stock options at December 31, 2013 are expected to vest. Stock options vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period. Compensation cost for stock options subject to accelerated vesting upon retirement is recognized over the implicit service period.

The total intrinsic value of options exercised during 2013, 2012, and 2011 was $4.4 million, $0.6 million, and $3.9 million, respectively. The total fair value of options that vested during 2013, 2012, and 2011 was $2.4 million, $2.3 million, and $2.7 million, respectively. At December 31, 2013, we had $0.6 million of unrecognized compensation cost related to stock options that will be recognized over a weighted average period of 0.7 years.

The weighted average grant date fair value of options granted during 2013, 2012, and 2011 was $9.77, $9.78, and $11.73, respectively. We estimated the fair value on the date of grant using the Black-Scholes valuation model. The following assumptions were used to value the 2013, 2012, and 2011 grants:

• Expected volatility of 52 percent, 52 percent, and 53 percent, respectively, based on our historical daily stock prices.

• Expected life of 6.0 years, 6.0 years, and 5.5 years, respectively, based on historical average years to exercise.

• Expected dividend yield of 2.14 percent, 1.80 percent, and 1.41 percent, respectively, based on the dividend rate at the date of grant.

• Risk free interest rate of 1.12 percent, 1.13 percent, and 2.37 percent, respectively, based on the yield of U.S. Treasury bonds at the date of grant.

Expense

Compensation expense for the stock plans, as reported in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Performance Share Units	$	1.1	$	—	$	—
Restricted Stock Units and Cash-Settled Awards	21.0		20.9		19.6
Stock Options	1.0		2.7		2.7
Other	0.5		0.6		1.2
Total Compensation Expense, Before Income Tax	$	23.6	$	24.2	$	23.5
Total Compensation Expense, Net of Income Tax	$	15.6	$	15.6	$	15.3

Cash received under all share-based payment arrangements for the years ended December 31, 2013, 2012, and 2011 was $11.4 million, $4.9 million, and $14.8 million, respectively.

160

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 12 - Reinsurance

Our reinsurance recoverable at December 31, 2013 relates to 86 companies. Thirteen major companies account for approximately 91 percent of our reinsurance recoverable at December 31, 2013, and are all companies rated A or better by A.M. Best Company (AM Best) or are fully securitized by letters of credit or investment-grade fixed maturity securities held in trust. Approximately eight percent of our reinsurance recoverable relates to business reinsured either with companies rated A- or better by AM Best, with overseas entities with equivalent ratings or backed by letters of credit or trust agreements, or through reinsurance arrangements wherein we retain the assets in our general account. The remaining one percent of our reinsurance recoverable is held by companies either rated below A- by AM Best or not rated.

Reinsurance data is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Direct Premium Income	$	7,777.3		$	7,736.0		$	7,521.5
Reinsurance Assumed	203.2			210.9			216.6
Reinsurance Ceded	(355.8		)	(230.8		)	(223.9		)
Net Premium Income	$	7,624.7		$	7,716.1		$	7,514.2
Ceded Benefits and Change in Reserves for Future Benefits	$	728.7		$	591.7		$	609.2

We entered into reinsurance agreements, effective January 1, 2013, whereby the agreements provide 50 percent coverage up to £0.5 million per covered life and 100 percent coverage, per covered life, above that amount for the existing in-force block of Unum UK group life business as well as new policies issued during the term of the agreements. 

We entered into a reinsurance agreement effective April 1, 2013 to cede the inforce policies on a small block of individual disability business in our Unum US segment.

Note 13 - Segment Information

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Closed Block and the Corporate segment.

The Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business, which are comprised of individual disability - recently issued insurance and voluntary benefits products. These products are marketed through our field sales personnel who work in conjunction with independent brokers and consultants.

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental lines of business, which include individual disability and critical illness products. Unum UK's products are sold primarily in the United Kingdom through field sales personnel and independent brokers and consultants.

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products and marketed to employees at the workplace through an independent contractor agency sales force and brokers.

The Closed Block segment consists of individual disability, group and individual long-term care, and other insurance products no longer actively marketed. The individual disability line of business in this segment generally consists of policies we sold prior to the mid-1990s and entirely discontinued selling in 2004, other than update features contractually allowable on existing policies. We discontinued offering group long-term care in 2012 and individual long-term care in 2009. Other insurance products include group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous product lines.

161

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 13 - Segment Information - Continued

The Corporate segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt other than non-recourse debt, and certain other corporate income and expense not allocated to a line of business.

We measure and analyze our segment performance using non-GAAP financial measures. A non-GAAP financial measure is a numerical measure of a company's performance, financial position, or cash flows that excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. The non-GAAP financial measures of "operating revenue" and "operating income" or "operating loss" differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of net realized investment gains and losses, non-operating retirement-related gains or losses, and certain other items as specified in the reconciliations below. We believe operating revenue and operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. Realized investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains or losses. Although we may experience realized investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities. The amortization of prior period actuarial gains or losses, a component of the net periodic benefit cost for our pensions and other postretirement benefit plans, is driven by market performance as well as plan amendments and is not indicative of the operational results of our businesses. We believe that excluding the amortization of prior period gains or losses from operating income or loss provides investors with additional information for comparison and analysis of our operating results. Although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and have historically increased or decreased over time, depending on plan amendments and market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of "operating revenue" to total revenue and "operating income" to income before income taxes is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Operating Revenue	$	10,347.0		$	10,459.2		$	10,282.9
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Total Revenue	$	10,353.8		$	10,515.4		$	10,278.0
Operating Income	$	1,241.8		$	1,239.7		$	1,323.2
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Non-operating Retirement-related Loss	(32.9		)	(46.4		)	(31.9		)
Unclaimed Death Benefits Reserve Increase for Unum US	(75.4		)	—			—
Unclaimed Death Benefits Reserve Increase for Colonial Life	(20.1		)	—			—
Group Life Waiver of Premium Benefit Reserve Reduction for Unum US	85.0			—			—
Deferred Acquisition Costs Impairment and Reserve Charges for Long-term Care Closed Block	—			—			(769.6		)
Reserve Charge for Individual Disability Closed Block	—			—			(183.5		)
Income Before Income Tax	$	1,205.2		$	1,249.5		$	333.3

162

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 13 - Segment Information - Continued

Premium income by major line of business within each of our segments is presented as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	1,553.9	$	1,578.8	1,580.2
Group Short-term Disability	519.6		476.7		455.2
Group Life and Accidental Death & Dismemberment
Group Life	1,213.9		1,182.1		1,106.7
Accidental Death & Dismemberment	121.6		115.3		109.2
Supplemental and Voluntary
Individual Disability - Recently Issued	465.3		477.6		464.7
Voluntary Benefits	642.8		626.0		580.0
	4,517.1		4,456.5		4,296.0
Unum UK
Group Long-term Disability	389.9		409.7		419.6
Group Life	106.4		221.3		203.6
Supplemental	60.3		63.6		64.4
	556.6		694.6		687.6
Colonial Life
Accident, Sickness, and Disability	738.7		724.5		695.3
Life	221.1		209.7		190.7
Cancer and Critical Illness	272.4		260.3		249.3
	1,232.2		1,194.5		1,135.3
Closed Block
Individual Disability	687.5		736.4		787.0
Long-term Care	630.6		631.9		608.1
All Other	0.7		2.2		0.2
	1,318.8		1,370.5		1,395.3
Total	$	7,624.7	$	7,716.1	$	7,514.2

163

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 13 - Segment Information - Continued

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Year Ended December 31, 2013
Premium Income	$	4,517.1	$	556.6	$	1,232.2	$	1,318.8	$	—		$	7,624.7
Net Investment Income	929.6		148.5		145.4		1,272.3		(3.7		)	2,492.1
Other Income	128.3		0.1		0.2		93.9		7.7			230.2
Operating Revenue	$	5,575.0	$	705.2	$	1,377.8	$	2,685.0	$	4.0		$	10,347.0
Operating Income (Loss)	$	859.0	$	132.0	$	284.9	$	109.4	$	(143.5	)	$	1,241.8
Interest and Debt Expense	$	0.1	$	—	$	—	$	8.4	$	140.9		$	149.4
Depreciation and Amortization	$	292.5	$	22.5	$	188.7	$	5.2	$	0.9		$	509.8
Year Ended December 31, 2012
Premium Income	$	4,456.5	$	694.6	$	1,194.5	$	1,370.5	$	—		$	7,716.1
Net Investment Income	952.3		170.8		138.6		1,230.5		23.0			2,515.2
Other Income	124.6		0.1		0.3		100.1		2.8			227.9
Operating Revenue	$	5,533.4	$	865.5	$	1,333.4	$	2,701.1	$	25.8		$	10,459.2
Operating Income (Loss)	$	847.1	$	131.3	$	274.3	$	95.5	$	(108.5	)	$	1,239.7
Interest and Debt Expense	$	1.1	$	—	$	—	$	10.4	$	133.9		$	145.4
Depreciation and Amortization	$	255.6	$	27.2	$	181.0	$	3.9	$	0.8		$	468.5
Year Ended December 31, 2011
Premium Income	$	4,296.0	$	687.6	$	1,135.3	$	1,395.3	$	—		$	7,514.2
Net Investment Income	951.4		189.9		132.4		1,189.7		56.2			2,519.6
Other Income	121.6		0.3		0.5		106.1		20.6			249.1
Operating Revenue	$	5,369.0	$	877.8	$	1,268.2	$	2,691.1	$	76.8		$	10,282.9
Operating Income (Loss)	$	816.9	$	190.7	$	270.1	$	123.9	$	(78.4	)	$	1,323.2
Interest and Debt Expense	$	1.0	$	—	$	—	$	10.5	$	131.8		$	143.3
Depreciation and Amortization	$	245.9	$	26.8	$	164.6	$	16.9	$	0.8		$	455.0

164

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 13 - Segment Information - Continued

The following table provides the changes in deferred acquisition costs by segment:

							Colonial			Closed
	Unum US			Unum UK			Life			Block			Total
	(in millions of dollars)
Year Ended December 31, 2013
Beginning of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Capitalized	252.0			9.8			205.0			—			466.8
Amortization	(230.0		)	(14.7		)	(174.2		)	—			(418.9		)
Adjustment Related to Unrealized Investment Gains/Losses	5.2			—			20.2			—			25.4
Foreign Currency	—			0.4			—			—			0.4
End of Year	$	1,051.5		$	34.3		$	743.4		$	—		$	1,829.2
Year Ended December 31, 2012
Beginning of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1
Capitalized	249.2			11.8			206.3			—			467.3
Amortization	(196.5		)	(15.7		)	(166.5		)	—			(378.7		)
Adjustment Related to Unrealized Investment Gains/Losses	(0.2		)	—			(11.8		)	—			(12.0		)
Foreign Currency	—			1.8			—			—			1.8
End of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Year Ended December 31, 2011
Beginning of Year	$	943.7		$	41.0		$	628.0		$	203.4		$	1,816.1
Capitalized	220.3			15.4			203.1			3.7			442.5
Amortization	(188.1		)	(15.3		)	(151.2		)	(11.1		)	(365.7		)
Impairment of Long-term Care Deferred Acquisition Costs	—			—			—			(196.0		)	(196.0		)
Adjustment Related to Unrealized Investment Gains/Losses	(4.1		)	—			(15.5		)	—			(19.6		)
Foreign Currency	—			(0.2		)	—			—			(0.2		)
End of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1

Assets by segment are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,384.3	$	19,391.2
Unum UK	3,654.1		3,975.8
Colonial Life	3,482.9		3,434.9
Closed Block	31,564.2		33,069.2
Corporate	2,318.1		2,365.0
Total	$	59,403.6	$	62,236.1

Revenue is primarily derived from sources in the United States and the United Kingdom. There are no material revenues or assets attributable to foreign operations other than those reported in our Unum UK segment.

We report goodwill in our Unum US segment and in our Unum UK segment, which are the segments expected to benefit from the originating business combinations. At December 31, 2013 and 2012, goodwill was $200.9 million and $201.7 million, respectively, with $189.0 million attributable to Unum US and the remainder attributable to Unum UK.

Stockholders' equity is allocated to the operating segments on the basis of an internal allocation formula that reflects the volume and risk components of each operating segment's business and aligns allocated equity with our target capital levels for regulatory and rating agency purposes. We modify this formula periodically to recognize changes in the views of capital requirements.

165

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 14 - Commitments and Contingent Liabilities

Commitments

We have noncancelable lease obligations on certain office space and equipment. As of December 31, 2013, the aggregate net minimum lease payments were $213.9 million payable as follows: $40.7 million in 2014, $27.9 million in 2015, $22.4 million in 2016, $17.7 million in 2017, $16.6 million in 2018, and $88.6 million thereafter. Rental expense for the years ended December 31, 2013, 2012, and 2011 was $44.1 million, $41.6 million, and $36.1 million, respectively.

At December 31, 2013, we had unfunded commitments of $158.4 million for certain of our private equity partnerships, $58.0 million for certain private placement fixed maturity securities, and $83.9 million for certain mortgage loans.  The commitments are not legally binding at December 31, 2013 and may or may not be funded during the term of the investments.

Contingent Liabilities

We are a defendant in a number of litigation matters. In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

Unless indicated otherwise in the descriptions below, reserves have not been established for litigation and contingencies. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Claims Handling Matters

We and our insurance subsidiaries, in the ordinary course of our business, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Most typically these lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our consolidated financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages could, from time to time, have a material adverse effect on our consolidated results of operations in a period, depending on the results of operations for the particular period.

From time to time class action allegations are pursued where the claimant or policyholder purports to represent a larger number of individuals who are similarly situated. Since each insurance claim is evaluated based on its own merits, there is rarely a single act or series of actions which can properly be addressed by a class action. Nevertheless, we monitor these cases closely and defend ourselves appropriately where these allegations are made.

166

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 14 - Commitments and Contingent Liabilities - Continued

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  In July 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. This decision was affirmed by the United States District Court for the Southern District of New York in September 2012 and upheld by the United States Court of Appeals for the Second Circuit in June 2013. In October 2013, the plaintiff filed a petition for writ of certiorari with the U.S. Supreme Court. On February 24, 2014, the Supreme Court denied the plaintiff’s petition.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This class action alleges that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were part of the ERISA employee welfare benefit plans and under which we paid death benefits via retained asset accounts. The plaintiffs' principal theories in the case are: (1) funds held in retained asset accounts were plan assets, and the proceeds earned by us from investing those funds belonged to the beneficiaries, and (2) payment of claims using retained asset accounts did not constitute payment under Maine's late payment statute, requiring us to pay interest on the undrawn retained asset account funds at an annual rate of 18 percent. In February 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts. A bench trial was held on the issue of damages in June and July of 2013. In September 2013, the District Court awarded damages based on a benchmark it created by averaging the interest rates paid on money market mutual funds and money market checking accounts. Based on these averages, the District Court found that for certain periods of the class we should have paid additional interest and awarded damages of $12.1 million and prejudgment interest of $1.3 million. Subsequent to this judgment, in September 2013 we filed an appeal to the First Circuit Court of Appeals, and plaintiffs filed a cross appeal. Based on contrary law that has developed recently in similar cases, we believe that we have strong legal arguments to raise on appeal. We have not accrued a loss for the judgment because we have determined that we do not have a probable loss under the applicable accounting standard relating to the accrual of loss contingencies. We cannot predict the timing of a decision or assure the ultimate outcome of our appeal.

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. In addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years. During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established additional reserves of $95.5 million for payment of these benefits. Similar to other insurers, we are undergoing an examination by a third party acting on behalf of a number of state treasurers concerning our compliance with the unclaimed property laws of the participating states. We are cooperating fully with this examination, as well as with a Delaware Market Conduct examination and a Voluntary Disclosure Agreement process with the state of Minnesota. The legal and regulatory environment around unclaimed death benefits continues to evolve. It is possible that the current examination and/or similar investigations by other state jurisdictions may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties, the total of which may be in excess of the reserves established. See Note 6 for further information concerning the reserve for unclaimed death benefits.

167

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 14 - Commitments and Contingent Liabilities - Continued

In December 2012, State of West Virginia ex rel. John D. Perdue v. Provident Life and Accident Insurance Company and State of West Virginia ex rel. John D. Perdue v. Colonial Life & Accident Insurance Company were filed in the Circuit Court of Putnam County, West Virginia. These two separate complaints alleged violations of the West Virginia Uniform Unclaimed Property Act by failing to identify and report all unclaimed insurance policy proceeds due to be escheated to West Virginia.  The complaints sought to examine company records and assess penalties and costs in an undetermined amount. In December 2013, the court dismissed both complaints, holding that the West Virginia Uniform Unclaimed Property Act does not require insurance companies to periodically search the Social Security Administrations' Death Master File or escheat unclaimed life insurance benefits until a claim has been submitted. In January 2014, the plaintiff appealed the dismissal of both complaints.

In May 2013, a purported class action complaint entitled Ruben Don v. Unum Life Insurance Company of America, Wedner Insurance Group, Inc. dba The Morton Wedner Insurance Agency, and Does 1-30, was filed in the Superior Court of California, County of Los Angeles.  The plaintiff seeks to represent a class of California insureds who were issued long-term care policies containing an inflation protection feature.  The plaintiff alleges we incorrectly administer the inflation protection feature, resulting in an underpayment of benefits.  The complaint makes allegations against us for breach of contract, bad faith, fraud, violation of Business and Professions Code 17200, and injunctive relief. In June 2013, we removed the case to the United States District Court for the Central District of California.  We are in the process of preparing our response to this complaint.

Summary

Various lawsuits against us, in addition to those discussed above, have arisen in the normal course of business. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations.

Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period. We believe, however, that the ultimate outcome of all pending litigation and regulatory matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on our financial position.

Note 15 - Statutory Financial Information

Statutory Net Income, Capital and Surplus, and Dividends

Statutory net income for U.S. insurance companies is reported in conformity with statutory accounting principles prescribed by the National Association of Insurance Commissioners (NAIC) and adopted by applicable domiciliary state laws. The commissioners of the states of domicile have the right to permit other specific practices that may deviate from prescribed practices. Our traditional U.S. life insurance subsidiaries have no prescribed or permitted statutory accounting practices that differ materially from statutory accounting principles prescribed by the NAIC.

Certain of our traditional U.S. life insurance subsidiaries cede blocks of business to Northwind Re, Tailwind Re, and UnumProvident International Ltd. (UPIL), all of which are affiliated captive reinsurance subsidiaries (captive reinsurers) with Unum Group as the ultimate parent. These captive reinsurers were established for the limited purpose of reinsuring risks attributable to specified policies issued or reinsured by our life insurance subsidiaries. The captive reinsurers are all domiciled in the United States as of December 31, 2013. Our captive reinsurers have no material state prescribed accounting practices, except for UPIL. During 2013, we re-domesticated UPIL, which was previously domiciled in Bermuda, to the state of Vermont. Vermont reporting requirements for pure captive insurance companies follow GAAP, unless the commissioner permits the use of some other basis of accounting. UPIL has permission from Vermont to follow accounting practices that are generally consistent with current NAIC statutory accounting principles for its insurance reserves and invested assets supporting reserves. All other assets and liabilities are accounted for in accordance with GAAP, as prescribed by Vermont, which allows for the full recognition of deferred tax assets which are more likely than not to be realized. Statutory accounting principles have a stricter limitation for the recognition of deferred tax assets. The impact of following the prescribed and permitted practices of Vermont rather than

168

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 15 - Statutory Financial Information - Continued

statutory accounting principles prescribed by the NAIC resulted in higher capital and surplus for UPIL of approximately $176 million as of December 31, 2013.

The operating results and capital and surplus of our traditional U.S. life insurance subsidiaries and our captive reinsurers, prepared in accordance with prescribed or permitted accounting practices of the NAIC or states of domicile, are presented separately below. Results for 2012 and prior include those for UPIL as filed with insurance regulators in Bermuda.

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Combined Net Income
Traditional U.S. Life Insurance Subsidiaries	$	584.5	$	624.5	$	642.9
Captive Reinsurers	$	13.3	$	40.8	$	64.6
Combined Net Gain from Operations
Traditional U.S. Life Insurance Subsidiaries	$	617.5	$	649.8	$	664.0
Captive Reinsurers	$	13.6	$	37.4	$	55.4

	December 31
	2013		2012
	(in millions of dollars)
Combined Capital and Surplus
Traditional U.S. Life Insurance Subsidiaries	$	3,450.5	$	3,426.5
Captive Reinsurers	$	1,679.4	$	1,765.3

As derived from the most recent annual statutory basis financial statements filed with insurance regulators, the statutory net income and statutory capital and surplus of our United Kingdom insurance subsidiary, Unum Limited, was £94.6 million and £438.1 million, respectively.

Restrictions under applicable state insurance laws limit the amount of dividends that can be paid to a parent company from its insurance subsidiaries in any 12-month period without prior approval by regulatory authorities. For life insurance companies domiciled in the U.S., that limitation generally equals, depending on the state of domicile, either ten percent of an insurer's statutory surplus with respect to policyholders as of the preceding year end or the statutory net gain from operations, excluding realized investment gains and losses, of the preceding year. The payment of dividends to a parent company from a life insurance subsidiary is generally further limited to the amount of unassigned funds.

Based on the restrictions under current law, $591.0 million is available, without prior approval by regulatory authorities, during 2014 for the payment of dividends to Unum Group from its traditional U.S. life insurance subsidiaries. The ability of our captive insurers to pay dividends to their respective parent companies will depend on their satisfaction of applicable regulatory requirements and on the performance of the business reinsured.

We also have the ability to receive dividends from Unum Limited, subject to applicable insurance company regulations and capital guidance in the United Kingdom. Approximately £187.8 million is available for the payment of dividends from Unum Limited during 2014, subject to regulatory approval.

Deposits

At December 31, 2013 and 2012, our U.S. insurance subsidiaries had on deposit with U.S. regulatory authorities securities with a book value of $280.5 million and $277.5 million, respectively, held for the protection of policyholders.

169

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

Unum Group and Subsidiaries

Note 16 - Quarterly Results of Operations (Unaudited)

The following is a summary of our unaudited quarterly results of operations for 2013 and 2012:

	2013
	4th		3rd			2nd		1st
	(in millions of dollars, except share data)
Premium Income	$	1,890.7	$	1,897.3		$	1,905.8	$	1,930.9
Net Investment Income	629.4		615.5			626.1		621.1
Net Realized Investment Gain (Loss)	9.3		(26.1		)	13.3		10.3
Total Revenue	2,586.2		2,540.9			2,601.9		2,624.8
Income Before Income Tax	305.8		284.1			311.5		303.8
Net Income	221.2		205.7			218.6		212.6
Net Income Per Common Share
Basic	0.85		0.78			0.82		0.79
Assuming Dilution	0.84		0.78			0.82		0.79

	2012
	4th		3rd		2nd			1st
	(in millions of dollars, except share data)
Premium Income	$	1,937.2	$	1,929.4	$	1,927.6		$	1,921.9
Net Investment Income	643.0		619.2		633.5			619.5
Net Realized Investment Gain (Loss)	24.6		21.3		(2.1		)	12.4
Total Revenue	2,658.2		2,628.0		2,617.9			2,611.3
Income Before Income Tax	322.7		320.4		296.4			310.0
Net Income	233.9		230.2		216.4			213.9
Net Income Per Common Share
Basic	0.86		0.83		0.76			0.74
Assuming Dilution	0.85		0.83		0.76			0.73

Items affecting the comparability of our financial results during the fourth quarter of 2013 are as follows:

• A reserve increase of $95.5 million before tax and $62.1 million after tax related to unclaimed death benefits.

• A reserve reduction of $85.0 million before tax and $55.2 million after tax related to group life waiver of premium benefits.

See Notes 6 and 14 for further discussion of the above items.

170

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None

ITEM 9A. CONTROLS AND PROCEDURES

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have evaluated the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended, as of the end of the period covered by this report. We evaluated those controls based on the 1992 Internal Control - Integrated Framework from the Committee of Sponsoring Organizations of the Treadway Commission. Based on that evaluation, these officers concluded that our disclosure controls and procedures were effective as of December 31, 2013.

There have been no changes in our internal control over financial reporting, as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended, during the quarter ended December 31, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Management's Annual Report on Internal Control over Financial Reporting

The Company's management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended.  The Company's internal control over financial reporting encompasses the processes and procedures management has established to (i) maintain records that, in reasonable detail, accurately and fairly reflect the Company's transactions and dispositions of assets; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles; (iii) provide reasonable assurance that receipts and expenditures are appropriately authorized; and (iv) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the Company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. In addition, any projection of the evaluation of effectiveness to future periods is subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

We assessed the effectiveness of our internal control over financial reporting, based on criteria established in the 1992 Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission, and concluded that, as of December 31, 2013, we maintained effective internal control over financial reporting.

Attestation Report of the Company's Registered Public Accounting Firm

Ernst & Young LLP, the independent registered public accounting firm that audited our consolidated financial statements included herein, audited the effectiveness of our internal control over financial reporting, as of December 31, 2013, and issued the attestation report included as follows.

171

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

Unum Group

We have audited Unum Group and subsidiaries’ internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework) (the COSO criteria). Unum Group and subsidiaries’ management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying “Management’s Annual Report on Internal Control over Financial Reporting”. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Unum Group and subsidiaries maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Unum Group and subsidiaries as of December 31, 2013 and 2012, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2013, and our report dated February 26, 2014 expressed an unqualified opinion thereon.

Chattanooga, Tennessee

February 26, 2014

172

ITEM 9B. OTHER INFORMATION

None

173

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors and Executive Officers

The information required by this Item with respect to directors is included under the caption "Information About the Board of Directors," sub-captions "Nominees for Election as Directors with Terms Expiring in 2015" and "Continuing Directors," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

The information required by this Item with respect to our executive officers is included under the caption "Executive Officers of the Registrant" contained herein in Item 1 and is incorporated herein by reference.

The information required by this Item with respect to compliance with Section 16(a) of the Exchange Act is included under the caption "Ownership of Company Securities," sub-caption "Section 16(a) - Beneficial Ownership Reporting Compliance," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

The information required by this Item with respect to a code of ethics for our chief executive officer and certain senior financial officers is included under the caption "Corporate Governance," sub-caption "Codes of Conduct and Ethics," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

The information required by this Item with respect to the audit committee and audit committee financial experts is included under the caption "Corporate Governance," sub-captions "Committees of the Board" and "Audit Committee," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

Corporate Governance

Our internet website address is www.unum.com. We have adopted corporate governance guidelines, a code of conduct applicable to all of our directors, officers and employees, and charters for the audit, human capital, governance, finance and regulatory compliance committees of our board of directors in accordance with the requirements of the New York Stock Exchange (NYSE). In addition, our board of directors has adopted a code of ethics applicable to our chief executive officer and certain senior financial officers in accordance with the requirements of the Securities and Exchange Commission (SEC). These documents are available free of charge on our website and in print at the request of any shareholder from the Office of the Corporate Secretary, Unum Group, 1 Fountain Square, Chattanooga, Tennessee, 37402, or by calling toll-free 1-800-718-8824. We will post on our website amendments to or waivers from any provision of our code of conduct and our code of ethics, as required by the rules and regulations of the SEC and the listing standards of the NYSE.

ITEM 11. EXECUTIVE COMPENSATION

The information required by this Item with respect to executive compensation is included under the caption "Information About the Board of Directors," sub-caption "Director Compensation," and under the captions "Compensation Discussion and Analysis," "Report of the Human Capital Committee," "Compensation Tables," and "Post-Employment Compensation" in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

174

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by this Item with respect to security ownership of certain beneficial owners and management is included under the caption, “Ownership of Company Securities," sub-captions "Security Ownership of Directors and Officers" and "Security Ownership of Certain Shareholders," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

Equity Compensation Plan Information

The following table gives information as of December 31, 2013 about the common stock that may be issued under all of our existing equity compensation plans.

Plan Category	(a) Number of securities to be issued upon exercise of outstanding options, warrants and rights	(b) Weighted average exercise price of outstanding options, warrants and rights (5)	(c) Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Equity Compensation Plans Approved by Shareholders (1)	2,966,772 (3)	$21.17	19,366,821 (6)
Equity Compensation Plans Not Approved by Shareholders (2)	96,657 (4)	N/A	28,162 (7)
Total	3,063,429		19,394,983

(1) Our shareholders have approved the following plans: (a) Stock Incentive Plan of 2007, (b) Unum Group Employee Stock Purchase Plan, (c) Unum European Holding Company Limited Savings-Related Share Option Scheme 2008 (formerly the Unum Limited Savings-Related Share Option Scheme 2008), (d) Unum Ireland Savings-Related Share Option Scheme 2008, (e) Unum European Holding Company Limited Savings-Related Share Option Scheme 2011, and (f) Stock Incentive Plan of 2012.

(2) Our shareholders have not approved the Unum Group Non-Employee Director Compensation Plan of 2004.

(3) Includes 1,394,723 shares issuable upon the exercise of outstanding options, and 1,424,986, 115,527, and 31,536 shares issuable pursuant to outstanding restricted stock units, performance share units, and deferred share rights (including dividend equivalents accrued thereon), respectively, under our Stock Incentive Plan of 2007 and our Stock Incentive Plan of 2012.

(4) All are deferred share rights (each representing the right to one share of common stock), including dividend equivalents accrued thereon, granted to non-employee directors under the Unum Group Non-Employee Director Compensation Plan of 2004 in accordance with the deferral elections of such directors in respect of cash retainers and meeting fees payable to them.

(5) Restricted stock units, performance share units, and deferred share rights are not included in determining the weighted average exercise price in column (b) because they have no exercise price.

(6) Includes 75,000 shares authorized for issuance under the Unum Ireland Limited Savings-Related Share Option Scheme 2008, even though none have been reserved given that the plan is not expected to be utilized. Also includes approximately 77,291 dividend equivalents available for future issuance in respect of outstanding awards under the Stock Incentive Plan of 2007, which was otherwise replaced by the Stock Incentive Plan of 2012 effective May 24, 2012 for purposes of granting new awards. As of December 31, 2013, our Stock Incentive Plan of 2012 had 18.3 million shares remaining available for future issuance. Each full-value award is counted as 1.76 shares. We currently grant a majority of awards as restricted stock units, which are full-value awards.

(7) Represents approximate number of dividend equivalents available for future issuance in respect of outstanding awards under the Non-Employee Director Compensation Plan of 2004.

175

Below is a brief description of the equity compensation plans not approved by shareholders:

Unum Group Amended and Restated Non-Employee Director Compensation Plan of 2004

This plan provided for the payment of annual retainers and meeting fees (discontinued in May 2011) to the non-employee directors who served on Unum Group’s board of directors. Under the plan, directors made an irrevocable election each year to receive all or a portion of their retainers and meeting fees in either cash or deferred share rights. A deferred share right is a right to receive one share of common stock on the earlier of (i) the director’s separation from service as a director of Unum Group, or (ii) another designated date at least three years after the date of the deferral election. The number of deferred share rights granted is calculated as the number of whole shares equal to (i) the dollar amount of the annual retainer and/or fees that the director elects to have paid in deferred share rights, divided by (ii) the fair market value per share on the grant date. The aggregate number of shares which can be issued under the plan is 500,000. This plan terminated in May 2010 with respect to new awards, though dividend equivalents remain available for future issuance in respect of awards that were outstanding at that time. The plan is administered by the Human Capital Committee. The plan includes provisions restricting the transferability of the deferred share rights, provisions for adjustments to the number of shares available for grants, and the number of shares subject to outstanding grants in the event of recapitalization, reclassification, stock split, reverse stock split, reorganization, merger, consolidation, or other similar corporate transaction.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE

The information required by this Item with respect to certain relationships and related transactions and director independence is included under the caption "Corporate Governance," sub-captions "Director Independence" and "Related Party Transactions and Policy," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this Item with respect to fees paid to Ernst & Young LLP in 2013 and 2012 and our audit committee's pre-approval policies and procedures is included under the caption "Items to Be Voted On," sub-captions "Independent Auditor Fees" and "Policy for Pre-Approval of Audit and Non-Audit Services," in our definitive proxy statement for the 2014 Annual Meeting of Shareholders and is incorporated herein by reference.

176

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)	List of Documents filed as part of this report:			Page
	(1)	Financial Statements
		The following report and consolidated financial statements of Unum Group and Subsidiaries are included in Item 8.
		Report of Ernst & Young LLP, Independent Registered Public Accounting Firm		95
		Consolidated Balance Sheets at December 31, 2013 and 2012		96
		Consolidated Statements of Income for the three years ended December 31, 2013		98
		Consolidated Statements of Comprehensive Income for the three years ended December 31, 2013		99
		Consolidated Statements of Stockholders' Equity for the three years ended December 31, 2013		100
		Consolidated Statements of Cash Flows for the three years ended December 31, 2013		101
		Notes to Consolidated Financial Statements		102
	(2)	Financial Statement Schedules
		I.	Summary of Investments - Other than Investments in Related Parties	180
		II.	Condensed Financial Information of Registrant	181
		III.	Supplementary Insurance Information	186
		IV.	Reinsurance	188
		V.	Valuation and Qualifying Accounts	189
		Schedules not referred to have been omitted as inapplicable or because they are not required by Regulation S-X.
	(3)	Exhibits
		Index to Exhibits		190

177

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Unum Group
(Registrant)
By:	/s/ Thomas R. Watjen
	Thomas R. Watjen
	President and Chief Executive Officer
Date:	February 26, 2014

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Name Title Date

/s/ Thomas R. Watjen	President and Chief Executive Officer	February 26, 2014
Thomas R. Watjen	and a Director (principal executive officer)
/s/ Richard P. McKenney	Executive Vice President and Chief Financial Officer	February 26, 2014
Richard P. McKenney	(principal financial officer)
/s/ Vicki W. Corbett	Senior Vice President, Controller (controller)	February 26, 2014
Vicki W. Corbett

178

Name Title Date

*	Director	February 26, 2014
Theodore H. Bunting, Jr.
*	Director	February 26, 2014
E. Michael Caulfield
*	Director	February 26, 2014
Pamela H. Godwin
*	Director	February 26, 2014
Ronald E. Goldsberry
*	Director	February 26, 2014
Kevin T. Kabat
*	Director	February 26, 2014
Timothy F. Keaney
*	Director	February 26, 2014
Thomas Kinser
*	Director	February 26, 2014
Gloria C. Larson

*	Director	February 26, 2014
A. S. MacMillan, Jr.
*	Director	February 26, 2014
Edward J. Muhl
*	Director	February 26, 2014
Michael J. Passarella
*	Director	February 26, 2014
William J. Ryan
* By: /s/ Susan N. Roth	For all of the Directors	February 26, 2014
Susan N. Roth
Attorney-in-Fact

179

SCHEDULE I--SUMMARY OF INVESTMENTS -

OTHER THAN INVESTMENTS IN RELATED PARTIES

Unum Group and Subsidiaries

Type of Investment	Cost or Amortized Cost (1)		Fair Value		Amount shown on the balance sheet
	(in millions of dollars)
Fixed Maturity Securities:
Bonds
United States Government and Government Agencies and Authorities	$	1,028.6	$	1,196.1	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		1,783.2		1,783.2
Foreign Governments	1,226.4		1,373.2		1,373.2
Public Utilities	9,328.9		10,403.0		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		2,039.3		2,039.3
All Other Corporate Bonds	23,108.0		25,511.9		25,511.9
Redeemable Preferred Stocks	33.0		37.7		37.7
Total	38,289.6		$	42,344.4	42,344.4
Mortgage Loans	1,815.1				1,815.1
Policy Loans	3,276.0				3,276.0
Other Long-term Investments
Derivatives	—				10.8		(2)
Equity Securities	11.3				16.4
Miscellaneous Long-term Investments	530.7				538.8		(3)
Short-term Investments	913.4				913.4
Total Investments	$	44,836.1			$	48,914.9

(1) The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

(2) Derivatives are carried at fair value.

(3) The difference between amortized cost and carrying value primarily results from changes in the partnership owner's equity since acquisition.

180

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT

Unum Group (Parent Company)

BALANCE SHEETS

	December 31
	2013			2012
	(in millions of dollars)
Assets
Fixed Maturity Securities - at fair value (amortized cost: $143.9; $217.7)	$	145.3		$	224.6
Other Long-term Investments	57.2			73.0
Short-term Investments	164.0			433.5
Investment in Subsidiaries	10,082.8			10,079.1
Deferred Income Tax	68.1			234.1
Other Assets	558.8			489.1
Total Assets	$	11,076.2		$	11,533.4
Liabilities and Stockholders' Equity
Liabilities
Short-term Debt	$	0.3		$	6.6
Long-term Debt	1,875.2			1,896.2
Pension and Postretirement Benefits	295.3			801.6
Other Liabilities	246.3			216.4
Total Liabilities	2,417.1			2,920.8
Stockholders' Equity
Common Stock	36.1			36.0
Additional Paid-in Capital	2,634.1			2,607.7
Accumulated Other Comprehensive Income	255.0			628.0
Retained Earnings	8,083.2			7,371.6
Treasury Stock	(2,349.3		)	(2,030.7		)
Total Stockholders' Equity	8,659.1			8,612.6
Total Liabilities and Stockholders' Equity	$	11,076.2		$	11,533.4

See notes to condensed financial information.

181

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

STATEMENTS OF INCOME

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Dividends from Subsidiaries	$	636.6		$	670.8		$	800.0
Other Income	56.9			55.0			65.0
Total Revenue	693.5			725.8			865.0
Interest and Debt Expense	120.9			114.2			112.1
Other Expenses	48.9			65.5			57.7
Total Expenses	169.8			179.7			169.8
Income Before Income Tax of Parent Company	523.7			546.1			695.2
Income Tax Benefit	(14.7		)	(25.7		)	(13.9		)
Income of Parent Company	538.4			571.8			709.1
Equity in Undistributed Earnings (Loss) of Subsidiaries	319.7			322.6			(424.9		)
Net Income	858.1			894.4			284.2
Other Comprehensive Income (Loss), Net of Tax	(373.0		)	166.2			110.4
Comprehensive Income	$	485.1		$	1,060.6		$	394.6

See notes to condensed financial information.

182

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

STATEMENTS OF CASH FLOWS

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Provided by Operating Activities	$	612.5		$	677.3		$	827.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	—			—			133.9
Proceeds from Maturities of Fixed Maturity Securities	38.5			47.7			44.5
Proceeds from Sales and Maturities of Other Investments	9.4			1.0			—
Purchase of Fixed Maturity Securities	(139.8		)	(99.1		)	—
Purchase of Other Investments	—			(13.7		)	(3.0		)
Net Sales of Short-term Investments	269.5			40.4			192.8
Cash Distributions to Subsidiaries	(225.1		)	(175.2		)	(166.1		)
Acquisition of Property and Equipment	(78.8		)	(80.4		)	(81.1		)
Other, Net	(0.9		)	0.1			0.2
Cash Provided (Used) by Investing Activities	(127.2		)	(279.2		)	121.2
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(6.3		)	4.1			(222.6		)
Issuance of Long-term Debt	—			246.4			—
Issuance of Common Stock	11.4			4.9			14.8
Repurchase of Common Stock	(317.2		)	(496.7		)	(619.9		)
Dividends Paid to Stockholders	(146.5		)	(133.8		)	(121.0		)
Other, Net	(0.3		)	1.6			—
Cash Used by Financing Activities	(458.9		)	(373.5		)	(948.7		)
Increase in Cash	$	26.4		$	24.6		$	0.3

See notes to condensed financial information.

183

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

NOTES TO CONDENSED FINANCIAL INFORMATION

Note 1 - Basis of Presentation

The accompanying condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto of Unum Group and subsidiaries.

Note 2 - Debt

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Notes @ 5.75% due 2042, callable at or above par	$	248.6		$	248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	1,875.2			1,896.2
Short-term Debt
Securities Lending Agreements	0.3			6.6
Total	$	1,875.5		$	1,902.8

The junior subordinated debt securities due 2038 are callable under limited, specified circumstances. The remaining callable debt may be redeemed, in whole or in part, at any time. The aggregate contractual principal maturities are $350.0 million in 2016, $200.0 million in 2018, and $1,332.6 million in 2020 and thereafter.

Unsecured Notes

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $600.0 million notional amount interest rate swaps which effectively convert certain of our unsecured senior notes into floating rate debt. Under these agreements, we receive fixed rates of interest and pay variable rates of interest, based off of the three-month London Interbank Offered Rate (LIBOR).

Junior Subordinated Debt Securities

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures to the trust in connection with the capital securities offering. The debentures mature in 2038. The sole assets of the trust are the junior subordinated debt securities.

184

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

NOTES TO CONDENSED FINANCIAL INFORMATION - CONTINUED

Short-term Debt

Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty.

In 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

Interest and Debt Expense

Interest paid on long-term and short-term debt and related securities during 2013, 2012, and 2011 was $116.5 million, $109.0 million, and $115.6 million, respectively.

Credit Facility

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600.0 million. Borrowings under the credit facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility provides for interest rates based on either the prime rate or LIBOR. At December 31, 2013, no amount was outstanding on the facility.

Note 3 - Guarantees

In 2005, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued $400.0 million of 6.85% senior debentures due 2015. As of December 31, 2013, $296.9 million of these debentures, which we fully and unconditionally guarantee, were outstanding.

185

SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION

Unum Group and Subsidiaries

Segment	Deferred Acquisition Costs		Reserves for Future Policy Contract Benefits		Unearned Premiums		Policy and Contract Benefits
	(in millions of dollars)
December 31, 2013
Unum US	$	1,051.5	$	11,788.4	$	47.6	$	889.1
Unum UK	34.3		2,594.3		139.3		160.0
Colonial Life	743.4		1,815.6		30.0		193.7
Closed Block	—		26,900.8		196.9		268.2
Total	$	1,829.2	$	43,099.1	$	413.8	$	1,511.0
December 31, 2012
Unum US	$	1,024.3	$	12,449.3	$	46.1	$	890.3
Unum UK	38.8		2,487.1		142.9		155.7
Colonial Life	692.4		1,691.3		29.9		149.8
Closed Block	—		28,066.7		207.8		288.8
Total	$	1,755.5	$	44,694.4	$	426.7	$	1,484.6

186

SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION

Unum Group and Subsidiaries

(continued from preceding page)

Segment	Premium Income		Net Investment Income (1)			Benefits and Change in Reserves for Future Benefits (2)		Amortization of Deferred Acquisition Costs		All Other Expenses (3)		Premiums Written (4)
	(in millions of dollars)
December 31, 2013
Unum US	$	4,517.1	$	929.6		$	3,222.4	$	230.0	$	1,254.0	$	3,068.0
Unum UK	556.6		148.5			413.3		14.7		145.2		448.1
Colonial Life	1,232.2		145.4			667.0		174.2		271.8		1,011.8
Closed Block	1,318.8		1,272.3			2,293.0		—		282.6		1,307.0
Corporate	—		(3.7		)	—		—		180.4		—
Total	$	7,624.7	$	2,492.1		$	6,595.7	$	418.9	$	2,134.0
December 31, 2012
Unum US	$	4,456.5	$	952.3		$	3,238.6	$	196.5	$	1,251.2	$	3,045.0
Unum UK	694.6		170.8			541.4		15.7		177.1		466.3
Colonial Life	1,194.5		138.6			627.3		166.5		265.3		986.3
Closed Block	1,370.5		1,230.5			2,314.9		—		290.7		1,358.6
Corporate	—		23.0			—		—		180.7		—
Total	$	7,716.1	$	2,515.2		$	6,722.2	$	378.7	$	2,165.0
December 31, 2011
Unum US	$	4,296.0	$	951.4		$	3,113.5	$	188.1	$	1,250.5	$	2,965.8
Unum UK	687.6		189.9			493.8		15.3		178.0		480.0
Colonial Life	1,135.3		132.4			589.4		151.2		257.5		944.9
Closed Block	1,395.3		1,189.7			3,012.8		11.1		496.4		1,385.1
Corporate	—		56.2			—		—		187.1		—
Total	$	7,514.2	$	2,519.6		$	7,209.5	$	365.7	$	2,369.5

(1) Net investment income is allocated based upon segmentation. Each segment has its own specifically identified assets and receives the investment income generated by those assets.

(2) Included in 2013 are unclaimed death benefits reserve increases of $75.4 million in Unum US and $20.1 million in Colonial Life and a group life waiver of premium benefit reserve reduction of $85.0 million in Unum US. Included in 2011 in the Closed Block segment is a reserve charge of $573.6 million related to our long-term care business and a reserve charge of $183.5 million related to our individual disability business.

(3) Includes commissions, interest and debt expense, deferral of acquisition costs, compensation expense, non-operating retirement related loss, and other expenses. Where not directly attributable to a segment, expenses are generally allocated based on activity levels, time information, and usage statistics. Included in 2011 in the Closed Block segment is an impairment charge of $196.0 million related to long-term care deferred policy acquisition costs.

(4) Excludes life insurance.

187

SCHEDULE IV--REINSURANCE

Unum Group and Subsidiaries

	Gross Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage Amount Assumed to Net
	(in millions of dollars)
Year Ended December 31, 2013
Life Insurance in Force	$	781,495.9	$	25,904.7	$	1,026.2	$	756,617.4	0.1	%
Premium Income:
Life Insurance	$	2,018.7	$	253.6	$	10.0	$	1,775.1	0.6	%
Accident, Health, and Other Insurance	5,758.6		102.2		193.2		5,849.6		3.3	%
Total	$	7,777.3	$	355.8	$	203.2	$	7,624.7	2.7	%
Year Ended December 31, 2012
Life Insurance in Force	$	832,587.5	$	28,658.7	$	1,073.8	$	805,002.6	0.1	%
Premium Income:
Life Insurance	$	1,979.1	$	141.4	$	10.3	$	1,848.0	0.6	%
Accident, Health, and Other Insurance	5,756.9		89.4		200.6		5,868.1		3.4	%
Total	$	7,736.0	$	230.8	$	210.9	$	7,716.1	2.7	%
Year Ended December 31, 2011
Life Insurance in Force	$	782,935.6	$	28,341.1	$	1,141.6	$	755,736.1	0.2	%
Premium Income:
Life Insurance	$	1,868.8	$	146.6	$	10.9	$	1,733.1	0.6	%
Accident, Health, and Other Insurance	5,652.7		77.3		205.7		5,781.1		3.6	%
Total	$	7,521.5	$	223.9	$	216.6	$	7,514.2	2.9	%

188

SCHEDULE V--VALUATION AND QUALIFYING ACCOUNTS

Unum Group and Subsidiaries

Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Additions Charged to Other Accounts		Deductions (1)		Balance at End of Period
	(in millions of dollars)
Year Ended December 31, 2013
Real estate reserve (deducted from other long-term investments)	$	0.3	$	1.5	$	—	$	—	$	1.8
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	6.2	$	0.7	$	—	$	1.3	$	5.6
Year Ended December 31, 2012
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	5.7	$	0.9	$	—	$	0.4	$	6.2
Year Ended December 31, 2011
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	7.2	$	1.3	$	—	$	2.8	$	5.7

(1) Deductions include amounts deemed to reduce exposure of probable losses, amounts deemed uncollectible, and amounts related to fluctuations in the foreign currency exchange rate.

See Note 3 of the “Notes to Consolidated Financial Statements" contained herein in Item 8 for discussion of the mortgage loan valuation allowance.

189

INDEX TO EXHIBITS

With regard to applicable cross-references in this report, our current, quarterly and annual reports dated on or after May 1, 2003 are filed with the Securities and Exchange Commission (SEC) under File No. 1-11294 and such reports dated prior to May 1, 2003 are filed with the SEC under File No. 1-11834, except as otherwise noted below. Our registration statements have the file numbers noted wherever such statements are identified below.

(2.1) Asset Purchase Agreement between RBC Life Insurance Company and Provident Life and Accident Insurance Company dated November 18, 2003 (incorporated by reference to Exhibit 2.1 of our Form 10-K for the fiscal year ended December 31, 2003).

(2.2) Transition Services Agreement between RBC Life Insurance Company and Provident Life and Accident Insurance Company and UnumProvident Corporation dated November 18, 2003 (incorporated by reference to Exhibit 2.2 of our Form 10-K for the fiscal year ended December 31, 2003).

(2.3) TSA Amending Agreement between RBC Life Insurance Company and Provident Life and Accident Insurance Company and UnumProvident Corporation dated April 30, 2004 (incorporated by reference to Exhibit 2.3 of our Form 10-K for the fiscal year ended December 31, 2008).

(2.4) TSA Amending Agreement No. 2 between RBC Life Insurance Company and Provident Life and Accident Insurance Company and UnumProvident Corporation dated May 31, 2006 (incorporated by reference to Exhibit 2.4 of our Form 10-K for the fiscal year ended December 31, 2008).

(2.5) TSA Amending Agreement No. 3 between RBC Life Insurance Company and Provident Life and Accident Insurance Company and Unum Group dated October 1, 2008 (incorporated by reference to Exhibit 2.5 of our Form 10-K for the fiscal year ended December 31, 2008).

(3.1) Amended and Restated Certificate of Incorporation of Unum Group, effective May 23, 2013 (incorporated by reference to Exhibit 3.1 of our Form 8-K filed on May 24, 2013).

(3.2) Amended and Restated Bylaws of Unum Group, effective May 23, 2013 (incorporated by reference to Exhibit 3.2 of our Form 8-K filed on May 24, 2013).

(4.1) Indenture for Senior Debt Securities dated as of March 9, 2001 (incorporated by reference to Exhibit 4.1 of our Registration Statement on Form S-3 (Registration No. 333-100953) filed on November 1, 2002).

(4.2) Second Supplemental Indenture, dated as of June 18, 2002, between Unum Group and JPMorgan Chase Bank, as Trustee (incorporated by reference to Exhibit 4.2 of our Form 8-K filed on June 21, 2002).

(4.3) Indenture for Senior Debt Securities between Unum Group and The Bank of New York Mellon Trust Company, N.A. as Trustee dated as of September 30, 2009 (incorporated by reference to Exhibit 4.2 of our Form 8-K filed on September 30, 2009).

(4.4) Form of 7.125% Senior Note due 2016 (incorporated by reference to Exhibit 4.1 of our Form 8-K filed on September 30, 2009).

(4.5) Form of 5.625% Senior Note due 2020 (incorporated by reference to Exhibit 4.1 of our Form 8-K filed on September 15, 2010).

(4.6) Indenture for Senior Debt Securities, dated as of August 23, 2012, between Unum Group and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.2 of our Form 8-K filed on August 23, 2012).

(4.7) Form of 5.75% Senior Note due 2042 (incorporated by reference to Exhibit 4.1 of our Form 8-K filed on August 23, 2012).

Certain instruments defining the rights of holders of long-term debt securities of our company and our subsidiaries are omitted pursuant to Item 601(b)(4)(iii) of Regulation S-K. We hereby undertake to furnish to the Securities and Exchange Commission, upon request, copies of any such instruments.

(10.1) Agreement between Provident Companies, Inc. and certain subsidiaries and American General Corporation and certain subsidiaries dated as of December 8, 1997 (incorporated by reference to Exhibit 10.18 of Provident Companies Inc.'s Form 10-Q for fiscal quarter ended September 30, 1998).

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(10.2) Form of Change in Control Severance Agreement, as amended (incorporated by reference to Exhibit 10.8 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.3) Unum Life Insurance Company of America 1996 Deferred Compensation Plan (incorporated by reference to Exhibit 10.1 of Unum Corporation's Form 10-K for the fiscal year ended December 31, 1995, File No. 1-9254). *

(10.4) Unum Corporation Incentive Compensation Plan for Designated Executive Officers (incorporated by reference to Exhibit 10.2 of Unum Corporation's Form 10-K for fiscal year ended December 31, 1996, File No. 1-9254). *

(10.5) Supplemental Executive Retirement Plan (incorporated by reference to Exhibit 10.4 of Unum Corporation's Registration Statement on Form S-1 dated June 18, 1986). *

(10.6) Unum Group Supplemental Pension Plan, as amended and restated effective January 1, 2010. *

(10.7) First Amendment to the Unum Group Supplemental Pension Plan, effective as of June 17, 2013. *

(10.8) Second Amendment to the Unum Group Supplemental Pension Plan, effective as of December 31, 2013. *

(10.9) Administrative Reinsurance Agreement between Provident Life and Accident Insurance Company and Reassure America Life Insurance Company dated to be effective July 1, 2000 (incorporated by reference to Exhibit 10.1 of our Form 8-K filed on March 2, 2001).

(10.10) Unum Group Amended and Restated Non-Employee Director Compensation Plan of 2004, as amended (incorporated by reference to Exhibit 10.19 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.11) Unum Group Senior Executive Retirement Plan, as amended and restated effective January 1, 2008. *

(10.12) First Amendment to the Unum Group Senior Executive Retirement Plan, effective as of December 31, 2013. *

(10.13) California Settlement Agreement (incorporated by reference to Exhibit 10.1 of our Form 8-K filed on October 3, 2005).

(10.14) Amendment to Regulatory Settlement Agreement (incorporated by reference to Exhibit 10.2 of our Form 8‑K filed on October 3, 2005).

(10.15) Second Amended and Restated Employment Agreement between Unum Group and Thomas R. Watjen dated as of December 27, 2013. *

(10.16) Unum Group Stock Incentive Plan of 2007, as amended (incorporated by reference to Exhibit 10.26 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.17) Form of Restricted Stock Unit Agreement with Employee, as amended, for awards under the Unum Group Stock Incentive Plan of 2007 (incorporated by reference to Exhibit 10.28 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.18) Form of Restricted Stock Unit Agreement with Employee, as amended, effective February 22, 2011, for awards under the Unum Group Stock Incentive Plan of 2007 (incorporated by reference to Exhibit 10.2 of our Form 10-Q filed on May 4, 2011). *

(10.19) Form of Restricted Stock Unit Agreement with Director, as amended, for awards under the Unum Group Stock Incentive Plan of 2007 (incorporated by reference to Exhibit 10.32 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.20) Cash-Settled Restricted Stock Unit Agreement between Unum Group and Thomas R. Watjen dated as of February 25, 2010 (incorporated by reference to Exhibit 10.1 of our Form 10-Q filed on May 5, 2010). *

(10.21) Form of Cash-Settled Restricted Stock Unit Agreement with Employee, as amended, effective February 22, 2011, for awards under the Unum Group Stock Incentive Plan of 2007 (incorporated by reference to Exhibit 10.3 of our Form 10-Q filed on May 4, 2011). *

(10.22) Amended and Restated Aircraft Time-Sharing Agreement between Thomas R. Watjen and Unum Group dated as of March 8, 2010 (incorporated by reference to Exhibit 10.2 of our Form 10-Q filed on May 5, 2010). *

(10.23) Severance Pay Plan for Executive Vice Presidents (EVPs) (incorporated by reference to Exhibit 10.35 of our Form 10-K for the fiscal year ended December 31, 2008). *

(10.24) Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Appendix A of our Definitive Proxy Statement on Schedule 14A filed on April 12, 2012). *

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(10.25) Form of Restricted Stock Unit Agreement with Director for awards under the Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Exhibit 10.1 of our Form 10-Q filed on November 1, 2012). *

(10.26) Form of Restricted Stock Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Exhibit 10.1 of our Form 10-Q filed on May 2, 2013). *

(10.27) Form of Cash-Settled Restricted Stock Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Exhibit 10.2 of our Form 10-Q filed on May 2, 2013). *

(10.28) Form of Nonqualified Stock Option Agreement for awards under the Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Exhibit 10.3 of our Form 10-Q filed on May 2, 2013). *

(10.29) Form of Performance Share Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012 (incorporated by reference to Exhibit 10.4 of our Form 10-Q filed on May 2, 2013). *

(10.30) Annual Incentive Plan of Unum Group (incorporated by reference to Exhibit 10.1 of our Form 8-K filed on May 24, 2013). *

(10.31) Unum Group Non-Qualified Defined Contribution Retirement Plan, effective January 1, 2014. *

(10.32) Credit Agreement, dated as of August 29, 2013, among Unum Group, as Borrower, Wells Fargo Bank, National Association, as Administrative Agent, L/C Agent, Fronting Bank and Swingline Lender, JPMorgan Chase Bank, N.A. and SunTrust Bank, as Co-Syndication Agents, and the other lenders named therein (incorporated by reference to Exhibit 10.1 of our Form 8-K filed on August 30, 2013).

(11) Statement Regarding Computation of Per Share Earnings (incorporated herein by reference to Note 10 of the "Notes to Consolidated Financial Statements").

(12) Statement Regarding Computation of Ratio of Earnings to Fixed Charges.

(21) Subsidiaries of the Registrant.

(23) Consent of Independent Registered Public Accounting Firm.

(24) Power of Attorney.

(31.1) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

(31.2) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

(32.1) Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

(32.2) Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

(101) The following financial statements from Unum Group's Annual Report on Form 10-K for the year ended December 31, 2013, filed on February 26, 2014, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Comprehensive Income, (iv) Consolidated Statements of Stockholders' Equity, (v) Consolidated Statements of Cash Flows, (vi) the Notes to Consolidated Financial Statements, (vii) Financial Statement Schedules.

___________

* Management contract or compensatory plan required to be filed as an exhibit to this form pursuant to Item 15(c) of Form 10-K.

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EX-10.6

UNUM GROUP SUPPLEMENTAL PENSION PLAN

As Amended and Restated Effective January 1, 2010

TABLE OF CONTENTS

Page

ARTICLE I    Definitions    1

ARTICLE II    Supplemental Plan Benefits    3

2.01    Eligibility    3

2.02    Accrued Supplemental Benefit    3

2.03    Death Benefit    4

2.04    Grandfathered Benefits    4

ARTICLE III    Distributions    4

3.01    Form and Time    4

3.02    Distributions Upon Death    4

3.03    Distributions to Key Employees    5

3.04    Distributions Pursuant to Transition Elections    5

3.05    Distributions Pursuant to Domestic Relations Orders    6

3.06    Other Limitations    6

ARTICLE IV    Administration    6

4.01    Allocation of Responsibility    6

4.02    Claims Procedure    6

4.03    Agents, Etc.    8

4.04    Indemnification    8

ARTICLE V    Miscellaneous    8

5.01    Amendment and Termination of Plan    8

5.02    Employee Status    8

5.03    Funding    8

5.04    Actuarial Equivalence    8

5.05    Assignment    9

5.06    Taxes    9

5.07    Plan Documents    9

5.08    Governing Law    9

UNUM GROUP SUPPLEMENTAL PENSION PLAN

Preamble

The Unum Group Supplemental Pension Plan (the “Plan”) set forth herein is effective generally January 1, 2010. The Plan was originally adopted effective January 1, 1983, and was last amended and restated effective generally January 1, 2008.

The primary purpose of the Plan is to establish a competitive level of retirement income for designated executives of Unum Group and its affiliated companies, by providing pension benefits that may not be provided under the Unum Group Pension Plan by reason of limitations imposed by the Internal Revenue Code of 1986, as amended. Participation in the Plan is limited to a select group of management or highly compensated employees within the meaning of the Employee Retirement Income Security Act of 1974, as amended.

Article I.Definitions

1.01“Affiliate” means any corporation that is an affiliate of the Company as defined in the Qualified Plan.

1.02“Board” or “Board of Directors” means the Board of Directors of the Company, or any person or persons to whom the Board delegates all or part of its authority under this Plan.

1.03“Code” means the Internal Revenue Code of 1986, as amended from time to time.

1.04“Administrator” means the Vice President – Corporate Benefits of Unum Group, and any person or entity to which the Administrator delegates all or part of its authority under this Plan.

1.05“Benefit Administrative Committee” means the committee appointed in accordance with Section 14.02 of the Qualified Plan to review and determine appeals from adverse benefit determinations.

1.06“Company” means Unum Group.

1.07“Earnings” means a Participant’s earnings as defined in the Qualified Plan, except that Earnings shall be determined without regard to the limit on the amount of compensation that may be taken into account under Code Section 401(a)(17), plus amounts deferred by the Participant under any nonqualified deferred compensation plan of the Company or a Participating Affiliate.

1.08“Effective Date” of this amendment and restatement means January 1, 2010, except as may be otherwise indicated herein or required by applicable law.

1.09“Eligibility Date” means the later of (1) the date on which a Participant attains age sixty (60) and (2) the date on which he or she terminates employment with the Company and its Affiliates; provided that, if the Participant is described in Section 3.04(a) or (c), his or her Eligibility Date shall be the date determined therein.

1.10“ERISA” means the Employee Retirement Income Security Act of 1974, as amended from time to time.

1.11“Key Employee” means a key employee as defined in Code Section 416(i) and the regulations thereunder, without regard to Code Section 416(i)(5). For purposes of the Plan:

(a)    The compensation taken into account for Key Employee determinations shall be “Section 415 Compensation” as defined in the Qualified Plan; and

(b)    Whether a Participant is a Key Employee on his or her termination of employment date or date of death, whichever applies, shall be determined in accordance with Treas. Reg. § 1.409A-1(i), or any successor thereto. The identification date shall be December 31, and the identification shall apply for the 12-month period beginning on the next following April 1 (the specified employee effective date).

1.12“Participant” for a Plan Year means a participant in the Qualified Plan who either:

(a)    has Earnings for the Plan Year that exceed the amount of compensation that may be taken into account under Code Section 401(a)(17);

(b)    accrues a benefit for the Plan Year that is limited by Code Section 415 or 416; or

(c)    is a participant in any other nonqualified deferred compensation plan of the Company or a Participating Affiliate for the Plan Year.

Each Participant shall remain an active Participant under the Plan until the earlier of the following dates:

(aa)    the date of his or her termination of employment with the Company and all Participating Affiliates or death; or

(bb)    the date on which he or she ceases to be a Participant described in the first sentence of this Section or otherwise ceases to be a member of a select group of highly compensated and management employees within the meaning of ERISA.

1.13“Participating Affiliate” means any Affiliate that has adopted the Plan with the consent of the Board of Directors.

1.14“Plan” means the Unum Group Supplemental Pension Plan as set forth herein and as amended from time to time hereafter.

1.15“Qualified Plan” means the Unum Group Pension Plan, as amended and restated effective January 1, 2005, and as amended from time to time thereafter.

1.16“Qualified Plan Benefit” means a Participant’s accrued retirement benefit under the Qualified Plan.

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1.17“Supplemental Plan Benefit” means the benefit payable to or on account of a Participant from this Plan under Article II.

1.18“Termination of employment” and “terminates employment” mean or refer to a severing of the employment relationship between an individual and the Company and all Affiliates where all parties reasonably anticipate that no further services will be performed after the termination date or that the level of bona fide services the individual will perform after such date (either as an employee or an independent contractor) will permanently decrease to no more than 20 percent of the average level of bona fide services performed (either as an employee or independent contractor) over the immediately preceding 36-month period or the full period of service for the Company and all Affiliates, if less than 36 months. A termination of employment does not occur if the individual is on military leave, sick leave, or other bona fide leave of absence, provided the leave of absence does not exceed 6 months or such longer period as the individual retains a right to reemployment pursuant to statute or contract, and there is a reasonable expectation that the individual will return to perform services for the Company or any Affiliate. This Section shall be interpreted and applied in accordance with Treasury Regulation Section 1.409A-1(h).

1.19“Vested” means that a Participant is fully vested in his or her Qualified Plan Benefit.

Article II.Supplemental Plan Benefits

2.01Eligibility.

(a)    A Vested Participant shall be entitled to receive a Supplemental Plan Benefit as of his or her Eligibility Date. The amount of such benefit shall be determined in accordance with Section 2.02.

(b)    If a Vested Participant dies prior to his or her Eligibility Date, and is survived by a spouse, then a death benefit shall be payable with respect to the Participant in accordance with Section 2.03. If a Participant dies after retirement benefits commence, then a death benefit shall be payable with respect to such Participant only to the extent provided by the form in which such benefit is being paid.

(c)    A Participant who terminates employment with the Company and all Affiliates prior to becoming Vested shall not be eligible to receive any Supplemental Plan Benefits.

2.02Accrued Supplemental Benefit. The Participant’s accrued Supplemental Plan Benefit as of his or her Eligibility Date shall equal the difference between (a) and (b):

(a)    The amount that would be the Participant’s accrued Qualified Plan Benefit as of such date if the qualified benefit were determined on the basis of Earnings under this Plan and without regard to any Qualified Plan provisions incorporating the limits of Code Sections 415 or 416, in the form of a Life Income Benefit (as defined in the Qualified Plan), assuming that payment commences on the Eligibility Date.

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(b)    The amount of the Participant’s actual accrued Qualified Plan Benefit as of such date, in the form of a Life Income Benefit (as defined in the Qualified Plan), assuming that payment commences on the Eligibility Date.

2.03Death Benefit. The monthly benefit payable to the surviving spouse of a Participant who dies before his or her Eligibility Date shall be equal to the benefit that would have been payable to such spouse under the 66⅔% Joint and Contingent Income Benefit described in Section 3.01(b), based on the following assumptions:

(a)    In the case of a Participant who dies after attaining age sixty (60), such Participant had terminated employment and commenced Supplemental Plan Benefit payments immediately before his or her death, or

(b)    In the case of a Participant who dies prior to attaining age sixty (60), such Participant had terminated employment on the earlier of his or her actual termination date or date of death, survived to age sixty (60), and commenced Supplemental Plan Benefit payments on the day immediately prior to his or her death.

2.04Grandfathered Benefits. If a Participant terminated employment with the Company and all Affiliates before January 1, 2005, then his or her rights and benefits shall not be determined under this amended and restated Plan, but shall be determined strictly in accordance with the terms of the Plan as in effect on December 31, 2004, including, but not limited to, all provisions relating to the amount, time of payment and form of distribution of Supplemental Plan Benefits.

Article III.Distributions

3.01Form and Time. Except as provided in Section 3.04, a Participant’s Supplemental Plan Benefit shall commence to be distributed to the Participant as of the first day of the month next following his or her Eligibility Date under Section 2.01(a), and the form of payment shall be determined by the Participant’s marital status on the benefit commencement date.

(a)    If the Participant is not married on the benefit commencement date, the Supplemental Plan Benefit shall be a Life Income Benefit. The Life Income Benefit provides a monthly benefit payable for the Participant’s life and ceases with the monthly payment due immediately preceding the Participant’s death.

(b)    If the Participant is married on the benefit commencement date, the Supplemental Plan Benefit shall be an actuarially equivalent 66⅔% Joint and Contingent Income Benefit. The 66⅔% Joint and Contingent Income Benefit provides a monthly benefit payable for the Participant’s life, and, if the Participant predeceases his or her spouse, a monthly survivor benefit payable for the further life of the spouse equal to sixty-six and two thirds percent (66⅔%) of the monthly benefit payable during the Participant’s life. Benefit payments shall cease with the monthly payment due immediately preceding the later of the Participant’s death and the Participant’s spouse’s death.

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3.02Distributions Upon Death. In the event of a Participant’s death before commencement of his or her Supplemental Plan Benefit, the pre-retirement death benefit payable to the Participant’s surviving spouse shall commence as of the first day of the month next following the Participant’s date of death or, if later, the date on which he or she would have attained age sixty (60), in the form of a monthly benefit for the surviving spouse’s lifetime.

3.03Distributions to Key Employees. Effective January 1, 2005, notwithstanding any other provision of the Plan (including the January 1, 2000 amendment and restatement of the Plan) to the contrary, in the case of a Participant who is a Key Employee on his or her termination of employment date, distributions shall commence as of the later of:  (a) the date distributions otherwise would begin without regard to this Section 3.03 and (b) the six-month anniversary of the Participant’s termination of employment date or, if earlier, the Participant’s date of death. No interest shall be accrued during the six-month period if benefit commencement is postponed pursuant to subsection (b) and Code Section 409(A)(a)(2)(B)(i).

3.04Distributions Pursuant to Transition Rules. Notwithstanding Section 3.01 to the contrary:

(a)Effective January 1, 2007, each eligible Participant (as described below) shall be permitted to make an election regarding the time and form of distribution of his or her total Supplemental Plan Benefit. The election shall be made before December 31, 2007 (or such earlier date as the Administrator shall specify), in accordance with procedures established by the Administrator pursuant to IRS Notice 2005-1, Q&A-19(c), IRS Notice 2006-79 § 3.02, and the transition rules set forth at 72 Fed. Reg. 19,272.

A Participant is eligible to make a transition election if he or she meets all of the following requirements: (1) the Participant has an accrued Supplemental Plan Benefit attributable to Plan Years before 2008; (2) he or she is an active Participant accruing benefits under the Plan for the 2007 Plan Year and remains employed by the Company and its affiliates on December 31, 2007; and (3) distributions to the Participant have not commenced before January 1, 2008.

A transition election under this subsection (a) shall be irrevocable; provided that, if the marital status of an eligible Participant who makes a transition election is different on the benefit commencement date than on the date of his or her transition election, the Participant shall be permitted (i) to choose payment in the form of any other actuarially-equivalent life annuity that he or she could have elected at the time of making the transition election, and (ii) in connection therewith, to change his or her beneficiary, if any. No other changes to a transition election shall be permitted.

(b)Distributions that commence before January 1, 2008, shall be determined in accordance with the provisions of the Plan as in effect on December 31, 2004.

(c)Distributions to a Participant who has an accrued Supplemental Plan Benefit attributable to Plan Years before 2008, but who is not eligible to make a transition election under

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subsection (a); to whom distributions have not commenced as of January 1, 2008; and who has attained age 60 as of such date shall commence on or before July 1, 2008.

3.05Distributions Pursuant to Domestic Relations Orders. The distribution of benefits under the Plan shall be subject to the terms of any domestic relations order with respect to a Participant that is either –

(a)    A domestic relations order regarding this Plan that the Administrator determines would be a qualified domestic relations order within the meaning of Code § 414(p) if this Plan were a tax-qualified retirement plan; or

(b)    A domestic relations order regarding the Participant’s aggregate benefits under this Plan and the Qualified Plan that has been determined by the Qualified Plan administrator to be a qualified domestic relations order within the meaning of Code § 414(p).

3.06Other Limitations. The Administrator may require a claimant for a distribution hereunder to furnish such information as it may reasonably request, and may delay the commencement of a distribution, if necessary, until such information is made available. Under no circumstances shall a Supplemental Plan Benefit be paid except on account of a Participant’s retirement or other termination of employment, or death, or pursuant to a domestic relations order with respect to the Participant.

Article IV.Administration

4.01    Allocation of Responsibility. The Administrator shall be responsible for the operation and administration of the Plan as provided for herein. The Benefit Administrative Committee shall be responsible for the review and determination of appeals from adverse benefit determinations. The Benefit Administrative Committee has plenary authority to interpret the Plan with regard to eligibility for benefits and to all other terms and provisions, and its final decision on appeal shall not be disturbed except upon a judicial determination of abuse of discretion.

All actions, decisions and interpretations of the Administrator and the Benefit Administrative Committee under the Plan shall be made in a uniform and nondiscriminatory manner.

4.02    Claims Procedure.

(a)    An individual claiming benefits under the Plan (or his or her authorized representative) may file an application therefore with the Administrator, by such written, telephonic or electronic means as the Administrator shall prescribe. The application shall be filed with:

Vice President Corporate Benefits Unum Group

2211 Congress Street

Portland, ME 04122

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If the application for a benefit is wholly or partially denied, the Administrator shall furnish the claimant with written or electronic notification of the adverse benefit determination. The notification shall set forth:

(i)    The specific reason or reasons for the adverse benefit determination;

(ii)    The specific Plan provisions on which the determination is based;

(iii)    Any additional material or information necessary for the claimant to perfect the claim and an explanation why such material or information is necessary; and

(iv)    A description of the Plan’s procedures for review of an adverse benefit determination and the applicable time limits, including a statement of the claimant’s right to bring a civil action under ERISA §502(a) following an adverse benefit determination on review.

The notification shall be furnished to the claimant within ninety (90) days after receipt of his or her claim; provided, such 90-day period may be extended to 180 days if the Administrator determines that special circumstances require an extension of time for processing the claim. The Administrator shall furnish the claimant with written notice indicating any special circumstances requiring an extension of time, and the date by which the Administrator expects to render the benefit determination, prior to the expiration of the initial 90-day period.

(b)    A claimant may appeal an adverse benefit determination by filing a written request for review with the Benefit Administrative Committee within sixty (60) days after receipt of the notification of such adverse benefit determination. The claimant or his or her duly authorized representative may submit to the Benefit Administrative Committee written comments, documents, records, and other information relating to the claim for benefits; and shall be provided, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information relevant to the claim for benefits.

(c)    The Benefit Administrative Committee shall provide the claimant with written or electronic notification of the benefit determination on review within sixty (60) days after receipt of a request for review; provided, such 60-day period may be extended to 120 days if the if the Benefit Administrative Committee determines that special circumstances require an extension of time for processing the claim on review. The Benefit Administrative Committee shall furnish the claimant with written notice indicating any special circumstances requiring an extension of time and the date by which the Benefit Administrative Committee expects to render the determination on review, prior to the expiration of the initial 60-day period.

In the case of an adverse benefit determination, the notification shall set forth the specific reason or reasons for the adverse determination; the specific Plan provisions on which the determination is based; and a statement of the claimant’s rights (i) to receive, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information relevant to the claimant’s claim for benefits; and (ii) to bring a civil action under Section 502(a) of ERISA.

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(d)    Before pursuing a legal remedy, a claimant shall first exhaust all claims, review, and appeals procedures under the Plan. A claimant may not bring a legal action in court against the Plan, Unum Group or any other Employer, the Benefit Administrative Committee, the Administrator, or any other person, or the employees or agents of these entities, more than one (1) year after final disposition of the claim under this Section. As of the Effective Date, the agent of service for legal process upon the Plan shall be:

Glenn Felton, Esq.
Vice President, Employment Law
Unum Group1 Fountain Square
Chattanooga, TN 37402

This Section is effective for claims and appeals of denied claims received by the Administrator on or after September 1, 2010.

4.03    Agents, Etc. The Administrator and the Benefit Administrative Committee may employ counsel and other agents, may delegate duties to such agents or to employees of the Company and may procure such clerical, accounting, actuarial, consulting and other services as may be required in carrying out the provisions of the Plan.

4.04    Indemnification. To the extent permitted by applicable law, the Company and the Participating Affiliates shall indemnify and hold harmless the Administrator and each member of the Benefit Administrative Committee against all expenses and liabilities arising out of his or her acts or omissions with respect to the Plan, provided such member would be entitled to indemnification pursuant to the bylaws of the Company or the affected Participating Affiliate, as the case may be.

Article V.Miscellaneous

5.01Amendment and Termination of Plan. The Board may at any time, in its sole discretion, terminate this Plan or amend the Plan in whole or in part. No such termination or amendment shall affect the right of any Participant or his or her spouse or designated beneficiary to receive a benefit under the terms of this Plan on the date immediately preceding such termination or amendment.

5.02Employee Status. Nothing contained herein shall confer upon any Participant the right to be retained in the service of the Company and its Affiliates or any other right not expressly provided for herein, nor shall the existence of this Plan impair the right of the Company and its Affiliates to discharge or otherwise deal with a Participant.

5.03Funding. This Plan is unfunded for purposes of the Code and Title I of ERISA and is not intended to meet the requirements of Code Section 401(a). The Plan constitutes a mere promise by the Company and the Participating Affiliates to pay benefits in the future, and a Participant hereunder shall have no greater rights than a general, unsecured creditor of the Company and the Participating Affiliates. The Company and each Participating Affiliate shall be

8

solely responsible for the payment of benefits with respect to its own employees who are Participants in the Plan.

5.04Actuarial Equivalence. Actuarial equivalence of the aggregate amounts expected to be received under different forms of benefit payment shall be determined in accordance with the actuarial assumptions specified in the Qualified Plan.

5.05Assignment. To the maximum extent permitted by law, no benefit under this Plan shall be assignable or subject in any manner to anticipation, alienation, sale, transfer, assignment, pledge, attachment, or encumbrance of any kind.

5.06Taxes. Any and all taxes that may be due and owing with respect to any payment under the Plan shall be the sole responsibility of the persons to whom and for whose benefit such payment is made, provided, however, that the Company shall withhold from any amount payable under the Plan all amounts that are required by law to be withheld.

5.07Plan Documents. Each Participant shall receive a copy of this Plan or a summary of its material provisions, and the Administrator shall make available for inspection by the Participant a copy of any rules and regulations adopted by the Administrator in administering the Plan.

5.08Governing Law. This Plan is established under and shall be construed according to the laws of the State of Tennessee, except to the extent such laws may be preempted by ERISA.

IN WITNESS WHEREOF, Unum Group has caused this document to be executed by its duly authorized officer on this 10th day of November, 2010, to be generally effective as of January 1, 2010.

WITNESS:                        UNUM GROUP

/s/ Linda A. Levesque                    By    /s/ Eileen C. Farrar            

Its    SVP, HR

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EX-10.7

FIRST AMENDMENT TO THE

UNUM GROUP SUPPLEMENTAL PENSION PLAN
January 1, 2010 Amendment and Restatement

The Unum Group Supplemental Pension Plan (the “Plan”) was last amended and restated effective generally January 1, 2010. The Plan shall be further amended as set forth herein.

1.The terms used in this Amendment have the meanings set forth in the Plan unless the context indicates otherwise.

2.Section 5.06 is amended to read in its entirety as follows:

5.06    Taxes.

(a)    Any and all taxes that may be due and owing with respect to any payment under the Plan shall be the sole responsibility of the persons to whom and for whose benefit such payment is made, provided, however, that the Company shall withhold from any amount payable under the Plan all amounts that are required by law to be withheld.

(b)    As permitted by Treasury Reg. §1.409A-3(j)(4)(vi), the Administrator may accelerate distribution of a Participant’s benefit to pay the Federal Insurance Contributions Act (FICA) withholding associated with Plan benefits and the income tax at source imposed under Code Section 3401 and corresponding withholding provisions of applicable state, local or foreign tax laws as a result of payment of the FICA amount, plus the additional income tax at source on wages attributable to the pyramiding Code Section 3401 wages and taxes. The total distribution under this subsection (b) shall not exceed the aggregate of the FICA tax amount and the income tax withholding related to the FICA tax amount.

If a distribution is made under this subsection (b), the future payments due the Participant or beneficiary shall be actuarially adjusted to offset the amount of the distribution.

3.This Amendment shall be effective upon the date of adoption written below.

IN WITNESS WHEREOF, to record the adoption of this Amendment, Unum Group has caused this instrument to be executed by its duly authorized officer this 17th day of June, 2013.

UNUM GROUP

By    /s/ Linda A. Levesque                

Its    VP, Corporate HR Benefits

EX-10.8

SECOND AMENDMENT TO THE

UNUM GROUP SUPPLEMENTAL PENSION PLAN
January 1, 2010 Amendment and Restatement

The Unum Group Supplemental Pension Plan (the “Plan”) was last amended and restated effective generally January 1, 2010, and subsequently amended on one occasion thereafter. The Plan shall be further amended as set forth herein.

1.The terms used in this Amendment have the meanings set forth in the Plan unless the context indicates otherwise.

2.The following sentence is added to the Preamble: “The Plan is frozen as of the close of the Plan Year ending December 31, 2013.”

3.The following paragraph is added to Section 2.02:

This Plan and the Qualified Plan are frozen as of December 31, 2013. Accordingly, notwithstanding the foregoing or any other provision of the Plan to the contrary, each Participant’s Accrued Supplemental Benefit shall be frozen as of such date and shall not increase thereafter.

4.The following Section 3.07 is added to the Plan:

3.07    Cashouts. Notwithstanding any other provision of the Plan to the contrary, if the actuarial equivalent present value of the entire nonforfeitable benefit payable with respect to a Participant on or after January 1, 2014, does not exceed fifteen thousand dollars ($15,000), then such benefit shall automatically be paid in the form of a single lump sum as of the date distributions otherwise would begin under this Article III. For this purpose, the “entire nonforfeitable benefit payable with respect to a Participant” means his or her entire interest under this Plan and all other agreements, methods, programs or other arrangements required to be aggregated with this Plan under Treasury Regulation Section 1.409A-1(c)(2). Such single sum shall be paid in lieu of all other benefits payable hereunder.

5.This Amendment shall be effective as of December 31, 2013.

IN WITNESS WHEREOF, to record the adoption of this Amendment, Unum Group has caused this instrument to be executed by its duly authorized officer this 23rd day of August, 2013.

UNUM GROUP

By    /s/ Linda A. Levesque                

Its    VP, Corporate Benefits

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EX-10.11

UNUM GROUP SENIOR EXECUTIVE RETIREMENT PLAN

As Amended and Restated Effective January 1, 2008

TABLE OF CONTENTS

Page

ARTICLE I    Definitions    1

ARTICLE II    Executive Plan Benefits    3

2.01    Eligibility    3

2.02    Accrued Executive Benefit    3

2.03    Special Rule for Disability    5

2.04    Death Benefit    5

2.05    Grandfathered Benefits    5

ARTICLE III    Distributions    5

3.01    Form and Time    5

3.02    Distributions Upon Death    6

3.03    Distributions to Key Employees    6

3.04    Distributions Pursuant to Transition Elections    6

3.05    Distributions Pursuant to Domestic Relations Orders    7

3.06    Other Limitations    7

ARTICLE IV    Administration    7

4.01    Administrative Committee    7

4.02    Action By Committee    7

4.03    Delegation    7

4.04    Claims Procedures    7

4.05    Indemnification    8

ARTICLE V    Miscellaneous    8

5.01    Amendment and Termination of Plan    8

5.02    Employee Status    8

5.03    Funding    9

5.04    Actuarial Equivalence    9

5.05    Assignment    9

5.06    Taxes    9

5.07    Plan Documents    9

5.08    Governing Law    9

UNUM GROUP SENIOR EXECUTIVE RETIREMENT PLAN

Preamble

The Unum Group Senior Executive Retirement Plan (the “Plan”) set forth herein is effective generally January 1, 2008. The Plan was originally adopted effective July 14, 1989, and was last amended and restated effective generally January 1, 2005.

The primary purpose of the Plan is to establish a competitive level of retirement income for designated senior executives of Unum Group and its affiliated companies. Participation in the Plan is limited to a select group of management or highly compensated employees within the meaning of the Employee Retirement Income Security Act of 1974, as amended.

Article I.Definitions

1.01“Affiliate” means any corporation which is an affiliate of the Company as defined in the Qualified Plan.

1.02“Board” or “Board of Directors” means the Board of Directors of the Company, or any person or persons to whom the Board delegates all or part of its authority under this Plan.

1.03“Code” means the Internal Revenue Code of 1986, as amended from time to time.

1.04“Committee” means the Human Capital Committee of the Board of Directors, or any other committee which shall be appointed by and serve at the discretion of the Board to administer the Plan.

1.05“Company” means Unum Group.

1.06“Earnings” means a Participant’s earnings as defined in the Qualified Plan, except that Earnings shall be determined without regard to the limit on the amount of compensation that may be taken into account under Code Section 401(a)(17), plus amounts deferred by the Participant under any nonqualified deferred compensation plan of the Company or a Participating Affiliate.

1.07“Effective Date” of this amendment and restatement means January 1, 2008, except as may be otherwise indicated herein or required by applicable law.

1.08“Eligibility Date” means the later of (1) the date on which a Participant attains age sixty (60) and (2) the date on which he or she terminates employment with the Company and its Affiliates; provided that, if the Participant has made a transition election described in Section 3.04, his or her Eligibility Date shall be the date selected therein.

1.09“ERISA” means the Employee Retirement Income Security Act of 1974, as amended from time to time.

1.10“Executive Plan Benefit” means the benefit payable to or on account of a Participant under Article III of this Plan.

1.11“Executive Service” means a Participant’s benefit service as defined in the Qualified Plan that is earned either (a) before the Participant commenced participation in this Plan or (b) during his or her active participation in this Plan. Any years of such benefit service earned after he or she ceases to be an active Participant in this Plan pursuant to Section 1.14 shall not be included in his or her Executive Service.

1.12“Final Average Earnings” means a Participant’s final average earnings as defined in the Qualified Plan, but determined by reference to his or her Earnings under this Plan. For purposes of determining Final Average Earnings, a Participant’s Earnings for each Plan Year ending after he or she commences participation in the Plan shall be taken into account, without regard to whether such Plan Year is included in his or her Executive Service, provided that he or she is credited with benefit service under the Qualified Plan for such year.

1.13“Key Employee” means a key employee as defined in Code Section 416(i) and the regulations thereunder, without regard to Code Section 416(i)(5). For purposes of the Plan:

(a)    The compensation taken into account for Key Employee determinations shall be “Section 415 Compensation” as defined in the Qualified Plan; and

(b)    Whether a Participant is a Key Employee on his or her termination of employment date or date of death, whichever applies, shall be determined in accordance with Treas. Reg. § 1.409A-1(i), or any successor thereto. The identification date shall be December 31, and the identification shall apply for the 12-month period beginning on the next following April 1 (the specified employee effective date).

1.14“Participant” means, as of the Effective Date, Thomas R. Watjen. The Committee may designate additional Participants from time to time after the Effective Date to receive such benefits under the Plan as are determined by the Committee. Each Participant shall remain an active Participant under the Plan until the earliest of the following dates:

(a)the date of his or her retirement under this Plan, death, or other termination of employment;

(b)the date on which he or she ceases to be a Participant designated by the Committee; and

(c)the date on which he or she ceases to be a member of a select group of highly compensated and management employees within the meaning of ERISA.

1.15“Participating Affiliate” means any Affiliate that has adopted the Plan with the consent of the Board of Directors.

1.16“Plan” means the Unum Group Senior Executive Retirement Plan as set forth herein and as amended from time to time hereafter.

1.17“Qualified Plan” means the Unum Group Pension Plan, as amended and restated effective January 1, 2005, and as amended from time to time thereafter.

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1.18“Qualified Plan Benefit” means a Participant’s accrued retirement benefit under the Qualified Plan.

1.19“Termination of employment” and “terminates employment” mean or refer to a severing of the employment relationship between an individual and the Company and all Affiliates where all parties reasonably anticipate that no further services will be performed after the termination date or that the level of bona fide services the individual will perform after such date (either as an employee or an independent contractor) will permanently decrease to no more than 20 percent of the average level of bona fide services performed (either as an employee or independent contractor) over the immediately preceding 36-month period or the full period of service for the Company and all Affiliates, if less than 36 months. A termination of employment does not occur if the individual is on military leave, sick leave, or other bona fide leave of absence, provided the leave of absence does not exceed 6 months or such longer period as the individual retains a right to reemployment pursuant to statute or contract, and there is a reasonable expectation that the individual will return to perform services for the Company or any Affiliate. This Section shall be interpreted and applied in accordance with Treasury Regulation Section 1.409A-1(h).

1.20“Vested” means, in the case of the Participant as of the Effective Date, that he is fully vested in his or her Qualified Plan Benefit. In the case of any Participant designated by the Committee after the Effective Date, “Vested” means that he or she both is credited with at least five years of vesting service under the Qualified Plan and has attained his or her earliest retirement date under the Qualified Plan before his or her termination of employment.

Article II.Executive Plan Benefits

2.01Eligibility.

(a)A Vested Participant shall be entitled to receive an Executive Plan Benefit as of his or her Eligibility Date. The amount of such benefit shall be determined in accordance with Section 2.02 and, if applicable, Section 2.03.

(b)If a Vested Participant dies prior to his or her Eligibility Date, and is survived by a spouse, then a death benefit shall be payable with respect to the Participant in accordance with Section 2.04; provided that, in the case of any Participant designated by the Committee after the Effective Date, he or she has not terminated employment as of the date of death. If a Participant dies after Plan benefits commence, then a death benefit shall be payable with respect to such Participant only to the extent provided by the form in which such benefit is being paid.

(c)A Participant who terminates employment with the Company and all Affiliates prior to becoming Vested shall not be eligible to receive any Executive Plan Benefits.

2.02Accrued Executive Benefit.

(a)A Participant’s accrued monthly Executive Plan Benefit as of his or her Eligibility Date shall equal 1/12^th of X - Y - Z, where

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X equals 2.5 percent of the Participant’s Final Average Earnings, multiplied by his or her years of Executive Service (up to twenty (20) years) and by the appropriate factor set forth in (b) below.

Y equals one hundred percent (100%) of the Participant’s accrued Qualified Plan Benefit as of such date, in the form of a Life Income Benefit (as defined in the Qualified Plan), assuming that payment commences on the Eligibility Date and determined in accordance with all applicable provisions of the Qualified Plan.

Z    equals one hundred percent (100%) of the Participant’s accrued monthly benefit under the Unum Group Supplemental Pension Plan as of such date, in the form of a Life Income Benefit (as defined in the Qualified Plan), assuming that payment commences on the Eligibility Date and determined in accordance with all applicable provisions of the Supplemental Pension Plan.

(b)The applicable factor for Xaboveshall be determined based on the Participant’s age at benefit commencement, and, in the case of any Participant who may be designated by the Committee after the Effective Date, his or her date of Plan eligibility, as follows.

(1)The following factors apply solely with respect to the Participant as of the Effective Date:

Attained Age in Years and Full Monthsat Benefit Commencement Date	Factor
60 But Less Than 65 Years	1.00
59 But Less Than 60 Years	0.95
58 But Less Than 59 Years	0.90
57 But Less Than 58 Years	0.85
56 But Less Than 57 Years	0.80
55 But Less Than 56 Years	0.75
For ages younger than sixty (60) years, the applicable factor shall be determined by interpolation between the factors applicable to whole years of age.

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(2)The following factors shall apply to any individual designated as a Participant after the Effective Date:

Attained Age in Years and Full Monthsat Benefit Commencement Date	Factor
62 But Less Than 65 Years	1.00
61 But Less Than 62 Years	0.95
60 But Less Than 61 Years	0.90
59 But Less Than 60 Years	0.85
58 But Less Than 59 Years	0.80
57 But Less Than 58 Years	0.75
56 But Less Than 57 Years	0.70
55 But Less Than 56 Years	0.65
For ages younger than sixty-two (62) years, the applicable factor shall be determined by interpolation between the factors applicable to whole years of age.

2.03Special Rule for Disability. If a Vested Participant terminates employment with the Company and its Affiliates on account of total disability as defined in the Qualified Plan, and such termination occurs before his or her Eligibility Date, then the Participant’s Earnings and Executive Service shall be adjusted for purposes of Section 3.02, in the same manner in which his or her earnings and benefit service are adjusted on account of total disability under the Qualified Plan.

2.04Death Benefit. The monthly benefit payable to the surviving spouse of a Vested Participant who dies before his or her Eligibility Date shall be equal to the benefit that would have been payable to such spouse under the 66⅔% Joint and Contingent Income Benefit described in Section 3.01(b), based on the following assumptions:

(a)In the case of a Participant who dies after attaining age sixty (60), such Participant had terminated employment and commenced Executive Plan Benefit payments immediately before his or her death, or

(b)In the case of a Participant who dies prior to attaining age sixty (60), such Participant had terminated employment on the earlier of his or her actual termination date or date of death, survived to age sixty (60), and commenced Executive Plan Benefit payments on the day immediately prior to his or her death.

2.05Grandfathered Benefits. If a Participant terminated employment with the Company and all Affiliates before January 1, 2005, then his or her rights and benefits shall not be determined under this amended and restated Plan, but shall be determined strictly in accordance with the terms of the Plan as in effect on December 31, 2004, including, but not limited to, all provisions relating to the amount, time of payment and form of distribution of Executive Plan Benefits.

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Article III.Distributions

3.01Form and Time. Except as provided in Section 3.04, a Participant’s Executive Plan Benefit shall commence to be distributed to the Participant as of the first day of the month next following his or her Eligibility Date under Section 2.01(a), and the form of payment shall be determined by the Participant’s marital status on the benefit commencement date.

(c)If the Participant is not married on the benefit commencement date, the Executive Plan Benefit shall be a Life Income Benefit. The Life Income Benefit provides a monthly benefit payable for the Participant’s life and ceases with the monthly payment due immediately preceding the Participant’s death.

(d)If the Participant is married on the benefit commencement date, the Executive Plan Benefit shall be an actuarially equivalent 66⅔% Joint and Contingent Income Benefit. The 66⅔% Joint and Contingent Income Benefit provides a monthly benefit payable for the Participant’s life, and, if the Participant predeceases his or her spouse, a monthly survivor benefit payable for the further life of the spouse equal to sixty-six and two thirds percent (66⅔%) of the monthly benefit payable during the Participant’s life. Benefit payments shall cease with the monthly payment due immediately preceding the later of the Participant’s death and the Participant’s spouse’s death.

3.02Distributions Upon Death. In the event of a Participant’s death before commencement of his or her Executive Plan Benefit, the pre-retirement death benefit payable to the Participant’s surviving spouse shall commence as of the first day of the month next following the Participant’s date of death or, if later, the date on which he or she would have attained age sixty (60), in the form of a monthly benefit for the surviving spouse’s lifetime.

3.03Distributions to Key Employees. Effective January 1, 2005, notwithstanding any other provision of the Plan to the contrary, in the case of a Participant who is a Key Employee on his or her termination of employment date, distributions shall commence as of the later of:  (a) the date distributions otherwise would begin without regard to this Section 3.03 and (b) the six-month anniversary of the Participant’s termination of employment date or, if earlier, the Participant’s date of death. No interest shall be accrued during the six-month period if benefit commencement is postponed pursuant to subsection (b) and Code Section 409(A)(a)(2)(B)(i).

3.04Distributions Pursuant to Transition Elections.

(a)Notwithstanding Section 3.01 to the contrary, effective January 1, 2007, each Participant described in subsection (b) shall be permitted to make a one-time irrevocable election regarding the time and form of distribution of his or her total Executive Plan Benefit. The election shall be made before December 31, 2007 (or such earlier date as the Committee shall specify), in accordance with procedures established by the Committee pursuant to IRS Notice 2005-1, Q&A-19(c), IRS Notice 2006-79 § 3.02, and the transition rules set forth at 72 Fed. Reg. 19,272. Distributions that commence before January 1, 2008, shall be determined in accordance with the provisions of the Plan as in effect on December 31, 2004.

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(b)A Participant is eligible to make a transition election if he or she meets all of the following requirements: (1) the Participant has an accrued Executive Plan Benefit attributable to Plan Years before 2008; (2) he or she is an active Participant accruing benefits under the Plan for the 2007 Plan Year and remains employed by the Company and its affiliates on December 31, 2007; and (3) distributions to the Participant have not commenced before January 1, 2008. Notwithstanding the foregoing, if the Participant also participates in the Unum Group Supplemental Pension Plan, he or she shall be permitted only one transition election, which, if made, shall determine the time and form of benefit payments with respect to the Participant under both plans.

3.05Distributions Pursuant to Domestic Relations Orders. The distribution of benefits under the Plan shall be subject to the terms of any domestic relations order with respect to a Participant that is either –

(a)    A domestic relations order regarding this Plan that the Committee determines would be a qualified domestic relations order within the meaning of Code § 414(p) if this Plan were a tax-qualified retirement plan; or

(b)    A domestic relations order regarding the Participant’s aggregate benefits under this Plan and the Qualified Plan that has been determined by the Qualified Plan administrator to be a qualified domestic relations order within the meaning of Code § 414(p).

3.06Other Limitations. The Committee may require a claimant for a distribution hereunder to furnish such information as it may reasonably request, and may delay the commencement of a distribution, if necessary, until such information is made available. Under no circumstances shall a Executive Plan Benefit be paid except on account of a Participant’s retirement or other termination of employment, or death, or pursuant to a domestic relations order with respect to the Participant.

Article IV.Administration

4.01Administrative Committee. The Committee shall have complete discretionary authority to control and manage the operation and administration of the Plan and to construe Plan provisions. Subject to the provisions of the Plan, the Committee from time to time may establish rules for the administration and interpretation of the Plan. The final determination of the Committee as to any disputed questions shall be conclusive and binding upon all parties. All actions, decisions and interpretations of the Committee in administering the Plan shall be made in a uniform and nondiscriminatory manner.

4.02Action By Committee. A majority of the Committee shall constitute a quorum, and an action of the majority present at any meeting shall be deemed the action of the Committee. Any member of the Committee may participate in a meeting of the Committee through conference telephone or similar communications equipment by means of which all individuals participating in the meeting can hear each other. Any action of the Committee may be taken without a meeting if all members of the Committee sign written consents setting forth

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the action taken or to be taken, at any time before or after the intended effective date of such action.

4.03Delegation. The Committee may authorize one or more of its members to execute or deliver any instrument, make any payment or perform any other act which the Plan authorizes or requires the Committee to do. The Committee may employ counsel and other agents, may delegate ministerial duties to such agents or to employees of the Company and may procure such clerical, accounting, actuarial, consulting and other services as it may require in carrying out the provisions of the Plan.

4.04Claims Procedure. If an application for a benefit (“claim”) is denied by the Committee, the Committee shall give written notice of such denial to the applicant, by certified or registered mail, within ninety (90) days after the claim was filed with the Committee; provided, however, that such 90-day period may be extended to one hundred eighty (180) days by the Committee if it determines that special circumstances exist which require an extension of the time required for processing the claim. Such denial shall set forth:

(a)the specific reason or reasons for the denial;

(b)the specific Plan provisions on which the denial is based;

(c)any additional material or information necessary for the applicant to perfect the claim and an explanation of why such material or information is necessary; and

(d)an explanation of the Plan’s claim review procedure.

Following receipt of such denial, the applicant or his or her duly authorized representative may:

(aa)    request a review of the denial by filing a written application for review with the Committee within sixty (60) days after receipt by the applicant of such denial;

(bb)    review documents pertinent to the claim at such reasonable time and location as shall be mutually agreeable to the applicant and the Committee; and

(cc)    submit issues and comments in writing to the Committee relating to its review of the claim.

The Committee shall, after consideration of the application for review, render a decision and shall give written notice thereof to the applicant, by certified or registered mail, within sixty (60) days after receipt by the Committee of the application for review; provided, however, that such 60-day period may be extended to one hundred twenty (120) days by the Committee if it determines that special circumstances exist which require an extension of the time required for processing the application for review. Such notice shall include specific reasons for the decision and specific references to the pertinent Plan provisions on which the decision is based.

4.05Indemnification. The Company and the Participating Affiliates shall indemnify and hold harmless each member of the Committee against all expenses and liabilities arising out

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of his or her acts or omissions with respect to the Plan, provided such member would be entitled to indemnification pursuant to the bylaws of the Company or the affected Participating Affiliate, as the case may be.

Article V.Miscellaneous

5.01Amendment and Termination of Plan. The Board may at any time, in its sole discretion, terminate this Plan or amend the Plan in whole or in part. No such termination or amendment shall affect the right of any Participant or his or her spouse or designated beneficiary to receive a benefit under the terms of this Plan on the date immediately preceding such termination or amendment.

5.02Employee Status. Nothing contained herein shall confer upon any Participant the right to be retained in the service of the Company and its Affiliates or any other right not expressly provided for herein, nor shall the existence of this Plan impair the right of the Company and its Affiliates to discharge or otherwise deal with a Participant.

5.03Funding. This Plan is unfunded for purposes of the Code and Title I of ERISA and is not intended to meet the requirements of Code Section 401(a). The Plan constitutes a mere promise by the Company and the Participating Affiliates to pay benefits in the future, and a Participant hereunder shall have no greater rights than a general, unsecured creditor of the Company and the Participating Affiliates. The Company and each Participating Affiliate shall be solely responsible for the payment of benefits with respect to its own employees who are Participants in the Plan.

5.04Actuarial Equivalence. Actuarial equivalence of the aggregate amounts expected to be received under different forms of benefit payment shall be determined in accordance with the actuarial assumptions specified in the Qualified Plan.

5.05Assignment. To the maximum extent permitted by law, no benefit under this Plan shall be assignable or subject in any manner to anticipation, alienation, sale, transfer, assignment, pledge, attachment, or encumbrance of any kind.

5.06Taxes. Any and all taxes that may be due and owing with respect to any payment under the Plan shall be the sole responsibility of the persons to whom and for whose benefit such payment is made, provided, however, that the Company shall withhold from any amount payable under the Plan all amounts that are required by law to be withheld.

5.07Plan Documents. Each Participant shall receive a copy of this Plan and the Committee shall make available for inspection by the Participant a copy of any rules and regulations adopted by the Committee in administering the Plan.

5.08Governing Law. This Plan is established under and shall be construed according to the laws of the State of Tennessee, except to the extent such laws may be preempted by ERISA.

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IN WITNESS WHEREOF, Unum Group has caused this document to be executed by its duly authorized officer on this 18th day of December, 2007, to be generally effective as of January 1, 2008.

WITNESS:                        UNUM GROUP

/s/ Anne L. Dyer                    By /s/ Eileen C. Farrar            

Its SVP, Human Resources

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EX-10.12

FIRST AMENDMENT TO THE UNUM GROUP SENIOR EXECUTIVE RETIREMENT PLANJanuary 1, 2008 Amendment and Restatement

The Unum Group Senior Executive Retirement Plan (the “Plan”) was last amended and restated effective generally January 1, 2008. The Plan shall be further amended as set forth herein.

1.The terms used in this Amendment have the meanings set forth in the Plan unless the context indicates otherwise.

2.The following sentence is added to the Preamble: “The Plan is frozen as of the close of the Plan Year ending December 31, 2013.”

3.The reference in Section 1.10 of the Plan to “Article III” is replaced with “Article II”.

4.Section 1.12 of the Plan is amended in its entirety to read as follows:

1.12    “Final Average Earnings” means the amount resulting from adding the Participant’s Earnings during the five calendar years (whether or not consecutive) in which such Earnings were the highest within the 10 consecutive calendar years ending on December 31, 2013, then dividing by five.

5.The following subsection (d) is added to Section 1.14:

(d)    December 31, 2013.

6.Sections 1.17 through 1.20 of the Plan are amended to renumber them as Sections 1.18 through 1.21, and a new Section 1.17 is added to read as follows:

1.17    “Plan Year” means plan year as defined in the Qualified Plan.

7.Section 1.18 of the Plan (after giving effect to this Amendment) is amended in its entirety to read as follows:

1.18    “Qualified Plan” means the Unum Group Pension Plan, as amended and restated effective generally January 1, 2010, and as amended from time to time thereafter.

8.The following subsection (d) is added to Section 2.01:

(d)    This Plan and the Qualified Plan are frozen as of December 31, 2013. Accordingly, notwithstanding the foregoing or any other provision of the Plan to the

contrary, each Participant’s accrued Executive Plan Benefit shall be frozen as of such date and shall not increase thereafter.

9.The reference in Section 2.03 of the Plan to “Section 3.02” is replaced with “Section 2.02”.

10.This Amendment shall be effective as of December 31, 2013.

IN WITNESS WHEREOF, to record the adoption of this Amendment, Unum Group has caused this instrument to be executed by its duly authorized officer this 27th day of December, 2013.

UNUM GROUP

By:    /s/ Rhonda L. Rigsby            

Name:    Rhonda L. Rigsby

Title:    Vice President, Executive Compensation

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EX-10.15

SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT

AGREEMENT by and between Unum Group, a Delaware corporation having its principal executive offices in Chattanooga, Tennessee (the “Company”), and Thomas R. Watjen (the “Executive”) dated as of December 27, 2013.

WHEREAS, the Executive currently serves as a senior executive officer of the Company pursuant to this Agreement as first entered into effective January 1, 2002, as amended and restated effective December 16, 2005, and as further amended September 17, 2008;

WHEREAS, the Company recognizes the Executive’s substantial contribution to the growth and success of the Company, desires to provide for the continued employment of the Executive and to make certain changes in the Executive’s employment arrangements with the Company, which the Board has determined will reinforce and encourage the continued attention and dedication to the Company of the Executive as a member of the Company’s senior management in the best interests of the Company and its shareholders;

WHEREAS, the Executive is willing to continue to serve the Company on the terms and conditions set forth below;

NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

1.Term of Agreement. The Company hereby agrees to continue to employ the Executive, and the Executive hereby agrees to continue in the employ of the Company subject to the terms and conditions of this Agreement, for the period commencing on December 30, 2013 (the “Effective Date”) and ending on the second anniversary of the Effective Date (the “Agreement Term”). Beginning on the first anniversary of the Effective Date and on each successive anniversary thereof, the Agreement Term shall be automatically extended for successive one-year terms unless either the Company or the Executive shall give (in accordance with Section 11(b)) to the other party written notice (a “Notice of Non-Renewal”) at least 60 days prior to the extension date of intention not to extend this Agreement. For the avoidance of doubt, a Notice of Non-Renewal would need to be given at least one year and 60 days prior to the expiration of the then-current Agreement Term. Notwithstanding the foregoing, any Notice of Non-Renewal given during the two-year period after a Change in Control (such two-year period being hereafter referred to as the “CIC Period”) shall be effective only at the expiration of the CIC Period; and further provided that if the Company enters into an agreement for a transaction that would constitute a Change in Control if consummated (the date of such agreement being a “Potential Change in Control”) then any Notice of Non-Renewal provided after such Potential Change in Control or within 3 months prior to such Potential Change in Control shall not be effective until the expiration of the CIC Period or, if no Change in Control occurs within 12 months of a Potential Change in Control, the expiration of such 12 month period.

2.    Terms of Employment.

(a)    Position and Duties.

(i)    The Executive shall serve as President and Chief Executive Officer of the Company, with the appropriate authority, duties and responsibilities attendant to such positions.

(ii)    Excluding any periods of vacation and sick leave to which the Executive is entitled, the Executive agrees to devote substantially all of his business attention and time to the business and affairs of the Company and, to the extent necessary to discharge the responsibilities assigned to the Executive hereunder, to use the Executive’s reasonable best efforts to perform such responsibilities. It shall not be a violation of this Agreement for the Executive to (x) serve, with prior approval of the Board, on corporate, civic or charitable boards or committees, (y) deliver lectures, fulfill speaking engagements or teach at educational institutions and (z) manage personal investments, so long as such activities do not significantly interfere with the performance of the Executive’s responsibilities as an employee of the Company in accordance with this Agreement. It is expressly understood and agreed that to the extent that any such activities have been conducted by the Executive prior to the Effective Date, the continued conduct of such activities (or the conduct of activities similar in nature and scope thereto) subsequent to the Effective Date shall not thereafter be deemed to interfere with the performance of the Executive’s responsibilities to the Company.

(b)    Compensation.

(i)    Annual Base Salary. The Executive shall receive an annual base salary (“Annual Base Salary”) of $1,122,000, effective March 1, 2013. Any increase in Annual Base Salary shall not serve to limit or reduce any other obligation to the Executive under this Agreement, and the term Annual Base Salary as utilized in this Agreement shall refer to Annual Base Salary as so increased.

(ii)    Annual Bonus. The Executive shall be eligible to receive an annual bonus (“Annual Bonus”) with a target level of not less than 150% of Annual Base Salary, or such greater amount as determined from time to time by the Human Capital Committee of the Company’s Board of Directors (the “Human Capital Committee”) (the “Target Bonus Amount”). Each such Annual Bonus shall be paid no later than two and a half months after the end of the fiscal year for which the Annual Bonus is awarded, unless the Executive shall elect to defer the receipt of such Annual Bonus pursuant to an arrangement established by the Company, if any, that meets the requirements of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”). It is understood that “Annual Bonus” does not include any special or supplemental bonuses that may be awarded from time to time by the Company.

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(iii)    Incentive Awards. The Executive shall be eligible for annual equity grants and/or cash-based awards, as determined by the Human Capital Committee based upon competitive market analyses and such other factors it may deem appropriate, including the Executive’s current position in equity of the Company.

(iv)    Other Employee Benefit Plans. Except as otherwise expressly provided herein, the Executive shall be entitled to participate in all employee benefit, welfare and other plans, practices, policies and programs (including relocation programs and policies intended to reimburse the Executive in respect of state and local income taxes imposed by jurisdictions where the Executive does not reside and attributable to compensation paid by the Company) (collectively, “Employee Benefit Plans”) applicable to senior executive officers of the Company.

(v)    Retirement Benefit. The Executive shall be entitled to a minimum annual retirement benefit from the Company payable monthly (the “Retirement Benefit”) determined as set forth in Attachment A. In addition, the Executive shall be entitled to post-retirement welfare benefit plan coverage pursuant to the terms of the applicable Company plans to the extent such coverage is provided by the Company. In determining the Executive’s eligibility for and entitlements to post-retirement welfare benefits, the Executive shall receive full credit for all of his years of service with the Company for all purposes; provided, however, that for purposes of the Company’s postretirement medical plans, the Executive shall receive credit for his years of service with the Company pursuant to the terms of such plans.

(vi)    Expenses. During the Agreement Term, the Executive shall be entitled to receive reimbursement, as incurred, of all reasonable expenses incurred by the Executive in the course of performing his duties and responsibilities under this Agreement, in accordance with the policies, practices and procedures of the Company to the extent available to other senior executive officers with respect to travel, entertainment and other business expenses. In no event shall the payments by the Company under this Section 2(b)(vi) be made later than the end of the calendar year next following the calendar year in which such expenses were incurred. The amount of such expenses that the Company is obligated to pay in any given calendar year shall not affect the expenses that the Company is obligated to pay in any other calendar year, and the Executive’s right to have the Company pay such expenses may not be liquidated or exchanged for any other benefit.

(vii)    Fringe Benefits. During the Employment Period, the Executive shall be entitled to fringe benefits in accordance with the plans, practices, programs and policies of the Company available to senior executive officers of the Company and any additional benefits as may be granted to the Executive by the Human Capital Committee. The Human Capital Committee of the Board will periodically review and monitor the fringe benefit program for senior executive officers, including the Executive.

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3.    Termination of Employment.

(a)    Death, Retirement or Disability. The Executive’s employment shall terminate automatically upon the Executive’s death or Retirement during the term of this Agreement. For purposes of this Agreement, “Retirement” means a voluntary termination of employment that qualifies as normal or early retirement under the Company’s then-current retirement plan, or if there is no such retirement plan, “Retirement” shall mean voluntary separation from service, as defined pursuant to Section 409A of the Code, after age 65 with ten years of service. As of the Effective Date, the Company’s retirement plan defines early retirement as voluntary termination after age 55 with five years of service, and normal retirement as voluntary termination after age 65. If the Company determines in good faith that the Disability of the Executive has occurred (pursuant to the definition of Disability set forth below), it may give to the Executive written notice in accordance with Section 11(b) of this Agreement of its intention to terminate the Executive’s employment. In such event, the Executive’s employment with the Company shall terminate effective on the 90th day after receipt of such notice by the Executive (the “Disability EffectiveDate”), provided, that, within the 90 days after such receipt, the Executive shall not have returned to full-time performance of the Executive’s duties. For purposes of this Agreement, “Disability” means the Executive is (x) unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, as determined by a physician selected by the Company or its insurers and acceptable to the Executive, or (y) by reason of any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, receiving income replacement benefits for a period of not less than three months under an accident and health plan covering employees of the Company, whichever is more favorable to the Executive.

(b)    Cause. The Company may terminate the Executive’s employment for Cause. For purposes of this Agreement, “Cause” shall mean:

(i)    the continued failure of the Executive to perform substantially the Executive’s duties hereunder (other than any such failure resulting from incapacity due to physical or mental illness), after a written demand for substantial performance is delivered to the Executive by the Board which specifically identifies the manner in which the Board believes that the Executive has not substantially performed the Executive’s duties, or

(ii)    the willful engaging by the Executive in illegal conduct or gross misconduct which is materially and demonstrably injurious to the Company, or

(iii)    conviction of a felony or a guilty or nolo contendere plea by the Executive with respect thereto.

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For purposes of this provision, no act or failure to act, on the part of the Executive, shall be considered “willful” unless it is done, or omitted to be done, by the Executive in bad faith or without reasonable belief that the Executive’s action or omission was in the best interests of the Company. Any act, or failure to act, based upon authority given pursuant to a resolution duly adopted by the Board (or any committee of the Board) or based upon the advice of counsel for the Company shall be conclusively presumed to be done, or omitted to be done, by the Executive in good faith and in the best interests of the Company. The cessation of employment of the Executive shall not be deemed to be for Cause unless and until there shall have been delivered to the Executive a copy of a resolution duly adopted by the affirmative vote of not less than two-thirds of the entire membership of the Board at a meeting of the Board called and held for such purpose (after reasonable notice is provided to the Executive and the Executive is given an opportunity, together with counsel, to be heard before the Board) finding that, in the good faith opinion of the Board, the Executive is guilty of the conduct described in subparagraph (i) or (ii) above, and specifying the particulars thereof in detail.

(c)    Good Reason. The Executive’s employment may be terminated by the Executive for Good Reason. In order to invoke a termination for Good Reason, the Executive shall provide written notice to the Company of one or more of the conditions described in clauses (i) through (vii) below within 90 days following the Executive’s actual knowledge of the initial existence of such condition, specifying in reasonable detail the conditions constituting Good Reason, and the Company shall have 30 days following receipt of such written notice (the “Cure Period”) during which it may remedy the condition. In the event that the Company fails to remedy the condition constituting Good Reason during the applicable Cure Period, the Executive’s “separation from service” (within the meaning of Section 409A of the Code) must occur, if at all, within two years following such Cure Period in order for such termination as a result of such condition to constitute a termination for Good Reason. Furthermore, in the event that the party to whom notice is given by Mr. Watjen pursuant to this Section 3(c) asserts or wishes to assert that such notice is untimely, the party making such an assertion that the notice is untimely must show that he, she or it was actually prejudiced by the late notice. For purposes of this Agreement, “GoodReason” shall mean the following events:

(i)    the assignment to the Executive of any duties materially inconsistent with the Executive’s position (including status, offices, titles and reporting requirements), authority, duties or responsibilities as contemplated by Section 2(a)(i) of this Agreement, or any other action by the Company which results in a material diminution in such position, authority, duties or responsibilities, or the budget over which the Executive retains authority, excluding for this purpose an isolated, insubstantial and inadvertent action not taken in bad faith;

(ii)    any material failure by the Company to comply with any of the provisions of Section 2(b) of this Agreement (including, but not limited to, any reduction in Annual Base Salary), other than an isolated, insubstantial and inadvertent failure not occurring in bad faith;

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(iii)    any purported termination by the Company of the Executive’s employment otherwise than as expressly permitted by this Agreement;

(iv)    any material failure by the Company to comply with and satisfy Section 9(c) of this Agreement;

(v)    any required relocation of the Executive to a location more than 35 miles from the Executive’s location as of immediately prior to the Effective Date, other than if such relocation is to the Company’s headquarters;

(vi)    any required relocation of the Executive (whether or not to the Company’s headquarters) of more than 35 miles from the Executive’s location as of immediately prior to the Effective Date, if such required relocation occurs during the CIC Period; or

(vii)    any material diminution in the authority, duties, or responsibilities of those to whom the Executive is required to report, including without limitation any requirement that the Executive report to a corporate officer or employee instead of reporting directly to the Board of Directors of the Company.

Notwithstanding the foregoing, (x) placing the Executive on a paid leave for up to 30 days, pending the determination of whether there is a basis to terminate the Executive for Cause, shall not constitute a Good Reason event (but if the Executive is subsequently terminated for Cause, then the Executive shall repay any amounts paid by the Company to the Executive during such paid leave period); and (y) a Notice of Termination for Good Reason given by the Executive shall constitute a notice of resignation of all elected positions the Executive may hold with the Company or any of its subsidiaries or affiliates (including, but not limited to, all directorships), effective as of the Date of Termination (regardless of whether the Notice of Termination expressly states that the Executive is resigning from such elected positions).

(d)    Change in Control. For purposes of this Agreement, “Change in Control” shall mean the occurrence of any one of the following events:

(i)    during any period of two consecutive years, individuals who, at the beginning of such period, constitute the Board (the “Incumbent Directors”) cease for any reason to constitute at least a majority of the Board, provided that any person becoming a director and whose election or nomination for election was approved by a vote of at least two-thirds of the Incumbent Directors then on the Board (either by a specific vote or by approval of the proxy statement of the Company in which such person is named as a nominee for director, without written objection to such nomination) shall be an Incumbent Director; provided, however, that no individual initially elected or nominated as a director of the Company as a result of an actual or threatened election contest (as described in Rule 14a-11 under the Securities Exchange Act of 1934 (the “Act”)) (“Election Contest”) or other actual or threatened solicitation of proxies or consents by or on behalf of

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any “person” (as such term is defined in Section 3(a)(9) of the Act and as used in Sections 13(d)(3) and 14(d)(2) of the Act) other than the Board (“Proxy Contest”), including by reason of any agreement intended to avoid or settle any Election or Contest or Proxy Contest, shall be deemed an Incumbent Director;

(ii)    any person is or becomes a “beneficial owner” (as defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing 20% (30% with respect to deferred compensation subject to Section 409A of the Code) or more of the combined voting power of the Company’s then outstanding securities eligible to vote for the election of the Board (the “Company Voting Securities”); provided, however, that the event described in this paragraph (ii) shall not be deemed to be a Change in Control of the Company by virtue of any of the following acquisitions: (v) by the Company of any subsidiary, (w) by any employee benefit plan (or related trust) sponsored or maintained by the Company or any subsidiary, (x) by an underwriter temporarily holding securities pursuant to an offering of such securities, (y) pursuant to a Non-Qualifying Transaction (as defined in paragraph (iii)), or (z) a transaction (other than one described in (iii) below) in which Company Voting Securities are acquired from the Company, if a majority of the Incumbent Directors approve a resolution providing expressly that the acquisition pursuant to this clause (z) does not constitute a Change in Control of the Company under this paragraph (ii);

(iii)    the consummation of a merger, consolidation, statutory share exchange or similar form of corporate transaction involving the Company or any of its subsidiaries that requires the approval of the Company’s stockholders, whether for such transaction or the issuance of securities in the transaction (a “Reorganization”), or sale or other disposition of all or substantially all of the Company’s assets to an entity that is not an affiliate of the Company (a “Sale”), unless immediately following such Reorganization or Sale: (x) more than 50% of the total voting power of (A) the corporation resulting from such Reorganization or the corporation which has acquired all or substantially all of the assets of the Company (in either case, the “Surviving Corporation”), or (B) if applicable, the ultimate parent corporation that directly or indirectly has beneficial ownership of 100% of the voting securities eligible to elect directors of the Surviving Corporation (the “Parent Corporation”), is represented by the Company Voting Securities that were outstanding immediately prior to such Reorganization or Sale (or, if applicable, is represented by shares into which such Company Voting Securities were converted pursuant to such Reorganization or Sale), and such voting power among the holders thereof is in substantially the same proportion as the voting power of such Company Voting Securities among the holders thereof immediately prior to the Reorganization or Sale, (y) no person (other than any employee benefit plan (or related trust) sponsored or maintained by the Surviving Corporation or the Parent Corporation) is or becomes the beneficial owner, directly or indirectly, of 20% (30% with respect to deferred compensation subject to Section 409A of the Code) or more of the total voting power of the outstanding voting securities eligible to elect directors of the Parent Corporation (or, if there is no Parent Corporation, the Surviving Corporation)

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and (z) at least a majority of the members of the board of directors of the Parent Corporation (or, if there is no Parent Corporation, the Surviving Corporation) following the consummation of the Reorganization or Sale were Incumbent Directors at the time of the Board’s approval of the execution of the initial agreement providing for such Reorganization or Sale (any Reorganization or Sale which satisfies all of the criteria specified in (x), (y) and (z) above shall be deemed to be a “Non-Qualifying Transaction”); or

(iv)    the stockholders of the Company approve a plan of complete liquidation or dissolution of the Company.

Notwithstanding the foregoing, a Change in Control of the Company shall not be deemed to occur solely because any person acquires beneficial ownership of more than 20% (30% with respect to deferred compensation subject to Section 409A of the Code) of the Company Voting Securities as a result of the acquisition of Company Voting Securities by the Company which reduces the number of Company Voting Securities outstanding; provided, that, if after such acquisition by the Company such person becomes the beneficial owner of additional Company Voting Securities that increases the percentage of outstanding Company Voting Securities beneficially owned by such person, a Change in Control of the Company shall then occur.

(e)    Notice of Termination. Any termination by the Company or by the Executive shall be communicated by Notice of Termination to the other party hereto given in accordance with Section 11(b) of this Agreement. For purposes of this Agreement, a “Notice of Termination” means a written notice which (x) indicates the specific termination provision in this Agreement relied upon, (y) to the extent applicable, sets forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of the Executive’s employment under the provision so indicated and (z) specifies the Date of Termination (as defined below). The failure by the Executive or the Company to set forth in the Notice of Termination any fact or circumstance which contributes to a showing of Good Reason or Cause shall not waive any right of the Executive or the Company, respectively, hereunder or preclude the Executive or the Company, respectively, from asserting such fact or circumstance in enforcing the Executive’s or the Company’s rights hereunder.

(f)    Date of Termination. “Date of Termination” means (v) if the Executive’s employment is terminated by the Company for Cause, the date of receipt of the Notice of Termination or any later date specified therein within 90 days of such notice, (w) if the Executive’s employment is terminated by reason of death or Disability, the date of death of the Executive or the Disability Effective Date, as the case may be, (x) if the Executive’s employment is terminated by the Company other than for Cause, death or Disability, 90 days after giving such notice, (y) if the Executive’s employment is terminated by the Executive, 90 days after the giving of such notice by the Executive (or such shorter period as may be specified in the Notice of Termination) provided that the Company may elect to place the Executive on paid leave for all or any part of such up-to 90-day period or accelerate the Date of Termination, and (z) if the Executive’s

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employment is terminated pursuant to a Notice of Non-Renewal, the date specified in Section 1 as the end of the Agreement Term in which such notice is provided or any other mutually agreed upon date. The Company and the Executive shall take all steps necessary (including with regard to any post-termination services by the Executive) to ensure that any termination described in this Section 3 constitutes a “separation from service” within the meaning of Section 409A of the Code, and notwithstanding anything contained herein to the contrary, the date on which such separation from service takes place shall be the “Date of Termination.”

4.    Obligations of the Company upon Termination.

(a)    Good Reason; Other Than for Cause, Death, Retirement or Disability. If, (x) the Company shall terminate the Executive’s employment during the Agreement Term other than (A) for Cause, or (B) by reason of the Executive’s death, Retirement or Disability, or (y) the Executive shall terminate employment for Good Reason, this Agreement shall terminate without further obligation to the Executive other than as follows:

(i)    except as otherwise provided below, the Company shall pay to the Executive in a lump sum in cash within 10 days, subject to the Executive’s execution and nonrevocation, within 30 days after the Date of Termination, of a general release substantially in the form attached hereto as Attachment B:

A.    the product of (x) if the Date of Termination occurs during the CIC Period or during the twelve (12) month period after a Potential Change in Control (the “Potential CIC Period”), 3 times or (y) if the Date of Termination occurs outside of the CIC Period or Potential CIC Period, 2 times, the sum of (A) the average of the annual bonuses paid (or payable but deferred) to the Executive for the 3 completed calendar years prior to the year in which the Date of Termination occurs (the “Recent Annual Bonus”) and (B) the Executive’s Annual Base Salary (disregarding any decrease in Annual Base Salary constituting Good Reason); and

B.    the sum of (x) the Executive’s Annual Base Salary through the Date of Termination to the extent not theretofore paid (disregarding any decrease in Annual Base Salary constituting Good Reason), and (y) subject to the attainment of any performance goal designed to comply with the requirements of the performance based compensation exception of Section 162(m) of the Code (a “Section 162(m) Performance Goal”) that (A) has been established by the Human Capital Committee of the Board of Directors of the Company as of the Date of Termination for any bonus plan in which the Executive is eligible to participate as of the Date of Termination and (B) is applicable to the Executive, the product of (1) the Recent Annual Bonus multiplied by (2) a fraction, the numerator of which is the number of days in the fiscal year in which the Date of Termination occurs through the Date of Termination and the denominator of which is 365 (such product, the “Pro Rata

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Bonus”); provided, that, if (a) a Section 162(m) Performance Goal has not been established as of the Date of Termination for a bonus plan in which the Executive is eligible to participate as of the Date of Termination, (b) such a performance goal has been established for such a plan but is not intended to apply to the Executive or (c) the Date of Termination occurs on or following a Change of Control, the Executive shall be paid the Pro Rata Bonus, regardless of the attainment of any Section 162(m) Performance Goal (the sum of the amounts described in clauses (x) and (y) shall be hereinafter referred to as the “Accrued Obligations”);

Notwithstanding the foregoing provisions of Section 4(a)(i), any payment of a Pro Rata Bonus to be made to the Executive under Section 4(a)(i)(B)(y) based upon the achievement of any Section 162(m) Performance Goal shall not be made until the Human Capital Committee of the Board of Directors of the Company has certified the achievement of the Section 162(m) Performance Goal, which certification shall occur no later than two months following the end of the applicable performance period.

(ii)    (x) if the Date of Termination occurs during the CIC Period or during the Potential CIC Period, for a period of 3 years following the Executive’s Date of Termination , the Company shall continue to provide the Executive (and the Executive’s dependents, if applicable) with the same level of health care and life benefits which would have been provided to the Executive (and his dependents, if applicable) in accordance with the benefit plans described in Section 2(b)(iv) of this Agreement, upon substantially similar terms and conditions (including contributions required by the Executive for such benefits) as existed immediately prior to the Date of Termination (or, if more favorable to the Executive, as such benefits and terms and conditions existed immediately prior to the Change in Control or Potential Change in Control); provided, that, if the Executive cannot continue to participate in the Company plans providing such benefits, the Company shall otherwise provide such benefits on the same after-tax basis as if continued participation had been permitted, or (y) if the Date of Termination occurs outside of the CIC Period or Potential CIC Period, for a period of 2 years following the Executive’s Date of Termination, benefits substantially equivalent to those health and welfare benefits which would have been provided to the Executive (and his dependents, if applicable) in accordance with the benefit plans described in Section 2(b)(iv) of this Agreement if the Executive’s employment had not been terminated; provided, however, that the health care benefits provided during the two or three year period, as applicable, shall be provided in a manner that such benefits (and the costs and premiums thereof) are excluded from the Executive’s income for federal income tax purposes and, if the Company reasonably determines that providing continued coverage under one or more of its health care benefit plans contemplated herein could be taxable to Executive, the Company shall provide such benefits at the level required hereby through the purchase of individual insurance coverage. Notwithstanding the foregoing, (A) if and to the extent required to prevent a violation of Section 409A of the Code, the Executive will pay the entire cost of such

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coverage for the first 6 months after the Date of Termination and the Company will reimburse Executive for the Company’s share of such costs on the six-month anniversary of Executive’s “separation from service” as defined in Section 409A of the Code, and (B) if the Executive becomes reemployed with another employer and becomes eligible to receive group health and benefits from such employer, the Company’s obligation to provide the health and welfare benefits described herein shall cease, except as otherwise provided by law. The two or three year period of welfare benefit continuation hereunder shall run concurrently with any period for which Executive is eligible to elect health coverage under COBRA; and

(iii)    the Executive’s stock options, restricted stock awards and other equity based awards shall vest and be exercisable as provided in, and subject to the terms of, their applicable agreements and applicable Company plan or policy; and

(iv)    to the extent not theretofore paid or provided, the Company shall timely pay or provide to the Executive any other amounts or benefits required to be paid or provided or which the Executive is eligible to receive under any plan, program, policy or practice or contract or agreement of the Company and its affiliated companies through the Date of Termination (such other amounts and benefits shall be hereinafter referred to as the “Other Benefits”).

(b)    Death, Retirement or Disability. If the Executive’s employment is terminated by reason of the Executive’s death, Retirement or Disability, this Agreement shall terminate without further obligations to the Executive’s legal representatives or to the Executive, as the case may be, under this Agreement, other than for payment of the Accrued Obligations, the timely payment or provision of Other Benefits, and the Retirement Benefit (including the other retirement benefits provided in Section 2(b)(v), if applicable). In addition, the Executive’s stock options, restricted stock awards and other equity based awards shall vest and be exercisable as provided in, and subject to the terms of, their applicable agreements and applicable Company plan or policy. Accrued Obligations shall be paid to the Executive, or the Executive’s legal representatives, as applicable, in a lump sum in cash within 30 days after the Date of Termination. If, however, the Executive’s employment is terminated by reason of death after a Notice of Termination given either by the Executive for Good Reason or by the Company other than for Cause, the Company shall also pay to the Executive’s legal representatives in one lump sum the amount specified in Section 4(a)(i)(A).

(c)    Cause; Other than for Good Reason; Non-Renewal by the Executive. If the Executive’s employment shall be terminated for Cause or the Executive terminates his employment either without Good Reason or upon expiration of the Agreement Term by reason of Executive giving a Notice of Non-Renewal under Section 1, this Agreement shall terminate without further obligations to the Executive other than the obligation to pay to the Executive (x) his Annual Base Salary through the Date of Termination to the extent theretofore unpaid, and (y) the Other Benefits.

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(d)    Non-Renewal by the Company. If the Agreement Term expires pursuant to a Notice of Non-Renewal given by the Company under Section 1, and if the Executive’s employment with the Company terminates as of the last day of the Agreement Term or during the 24 months following such expiration of the Agreement Term (the “Non-Renewal Severance Period”) under circumstances that would have been a termination without Cause or a resignation by the Executive for Good Reason if the Agreement Term had not expired, then the Executive shall be entitled to the payments and benefits described in Section 4(a) of this Agreement; provided, that, any such payments and benefits will be conditioned on the Executive signing a general form of release within 30 days of the Date of Termination substantially in the form attached hereto as Attachment B. For the avoidance of doubt, a termination of the Executive’s employment during the Non-Renewal Severance Period for any other reason, including, without limitation, by reason of death, Disability or Retirement, shall not entitle him to benefits under this Section 4(d) or Section 4(a).

5.    Non-exclusivity of Rights. Except as specifically provided, nothing in this Agreement shall prevent or limit the Executive’s continuing or future participation in any plan, program, policy or practice provided by the Company or any of its affiliated companies and for which the Executive may qualify, nor, subject to Section 11(f), shall anything herein limit or otherwise affect such rights as the Executive may have under any contract or agreement with the Company or any of its affiliated companies. Amounts which are vested benefits or which the Executive is otherwise entitled to receive under any plan, policy, practice or program of or any contract or agreement with the Company or any of its affiliated companies at or subsequent to the Date of Termination shall be payable in accordance with such plan, policy, practice or program or contract or agreement except as explicitly modified by this Agreement; provided, that, the Executive shall not be eligible for severance benefits under any other program or policy of the Company.

6.    Full Settlement. Except as provided in this Section 6, the Company’s obligation to make the payments provided for in this Agreement and otherwise to perform its obligations hereunder shall not be affected by any set-off, counterclaim, recoupment, defense or other claim, right or action which the Company may have against the Executive or others. In no event shall the Executive be obligated to seek other employment or take any other action by way of mitigation of the amounts payable to the Executive under any of the provisions of this Agreement.

7.    Section 280G.

(a)    Anything in this Agreement to the contrary notwithstanding, in the event that the Accounting Firm shall determine that receipt of all Payments would subject the Executive to tax under Section 4999 of the Code, the Accounting Firm shall determine whether some amount of the Agreement Payments meets the definition of “Reduced Amount.” If the Accounting Firm determines that there is a Reduced Amount, then the aggregate Agreement Payments shall be reduced to such Reduced Amount.

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(b)    If the Accounting Firm determines that the aggregate Agreement Payments should be reduced to the Reduced Amount, the Company shall promptly give the Executive notice to that effect and a copy of the detailed calculation thereof, and the Executive may then elect, in his sole discretion, which and how much of the Agreement Payments shall be eliminated or reduced (as long as after such election the present value of the aggregate Agreement Payments equals the Reduced Amount); provided, that, the Executive shall not be permitted to elect to reduce any Agreement Payment that constitutes “nonqualified deferred compensation” for purposes of Section 409A of the Code, and shall advise the Company in writing of his election within 10 days of his receipt of notice. If no such election is made by the Executive within such 10-day period, the Company shall reduce the Agreement Payments in the following order: (x) Section 4(a)(i)(A), (y) Section 4(a)(i)(B), and (z) Section 4(a)(ii). All determinations made by the Accounting Firm under this Section 7 shall be binding upon the Company and the Executive and shall be made within 60 days of the Executive’s Date of Termination. In connection with making determinations under this Section 7, the Accounting Firm shall take into account the value of any reasonable compensation for services to be rendered by the Executive before or after the Change in Control, including any non-competition provisions that may apply to the Executive, and the Company shall cooperate in the valuation of any such services, including any non-competition provisions.

(c)    As a result of the uncertainty in the application of Section 4999 of the Code at the time of the initial determination by the Accounting Firm hereunder, it is possible that amounts will have been paid or distributed by the Company to or for the benefit of the Executive pursuant to this Agreement which should not have been so paid or distributed (each, an “Overpayment”) or that additional amounts which will not have been paid or distributed by the Company to or for the benefit of the Executive pursuant of this Agreement could have been so paid or distributed (each, an “Underpayment”), in each case, consistent with the calculations of the Reduced Amount hereunder. In the event that the Accounting Firm, based upon the assertion of a deficiency by the Internal Revenue Service against either the Company or the Executive which the Accounting Firm believes has a high probability of success, determines that an Overpayment has been made, any such Overpayment paid or distributed by the Company to or for the benefit of the Executive shall be repaid by the Executive to the Company together with interest at the applicable federal rate provided for in Section 7872(f)(2) of the Code; provided, however, that no such repayment shall be required if and to the extent such deemed repayment would not either reduce the amount on which the Executive is subject to tax under Section 1 and Section 4999 of the Code or generate a refund of such taxes. In the event that the Accounting Firm, based upon controlling precedent or substantial authority, determines that an Underpayment has occurred, any such Underpayment shall be promptly paid by the Company to or for the benefit of the Executive together with interest at the applicable federal rate provided for in Section 7872(f)(2) of the Code.

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(d)    All fees and expenses of the Accounting Firm in implementing the provisions of this Section 7 shall be borne by the Company:

(e)    Definitions.    The following terms shall have the following meanings for purposes of this Section 7.

(1)    A “Payment” shall mean any payment or distribution in the nature of compensation (within the meaning of Section 280G(b)(2) of the Code) to or for the benefit of the Executive, whether paid or payable, provided or to be provided, or distributed or distributable pursuant to this Agreement or otherwise;

(2)    “Agreement Payment” shall mean a Payment paid or payable pursuant to this Agreement;

(3)    “Net After-Tax Receipt” shall mean the present value of a Payment net of all taxes imposed on the Executive with respect thereto under Sections 1 and 4999 of the Code and under applicable state and local laws, determined by applying the highest marginal rate under Section 1 of the Code and under state and local laws which applied to the Executive’s taxable income for the immediately preceding taxable year, or such other rate(s) as the Executive shall certify, in the Executive’s sole discretion, as likely to apply to the Executive in the relevant tax year(s);

(4)    “Accounting Firm” shall mean a nationally recognized certified public accounting firm as may be designated by the Company and reasonably acceptable to the Executive; and

(5)    “Reduced Amount” shall mean the amount of Agreement Payments that (x) has a present value that is less than the present value of all Agreement Payments, without application of this Section 7, and (y) results in aggregate Net After-Tax Receipts for all Payments after application of this Section 7 that are greater than the Net After-Tax Receipts for all Payments that would have been made if this Section 7 were not applied.

8.    Competition; Confidential Information.

(a)    During the Agreement Term and for the eighteen month period following a termination of the Executive’s employment that entitles the Executive to a lump sum payment pursuant to Section 4(a)(i) or Section 4(d) (the “Restricted Period”), the Executive shall not directly or indirectly, own, manage, operate, join, control, or participate in the ownership, management, operation or control of, or be employed by or connected in any manner with, any competing business, whether for compensation or otherwise, without the prior written consent of the Company. Notwithstanding the preceding sentence, the Executive shall not be prohibited from owning less than 1% of any publicly traded corporation, whether or not such corporation is deemed to be a competing business. For the purposes of this Agreement, a “competing business” shall be any business which is a significant competitor of the Company or any of its subsidiaries, unless the Executive’s primary duties and responsibilities with respect to such business are not related to the management or operation of disability insurance or complementary

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special risk products and services in any country where the Company or any of its subsidiaries is conducting business. This Section 8(a) shall cease to apply upon the occurrence of a Change in Control.

(b)    During the Restricted Period, the Executive shall not, directly or indirectly, either for Executive’s own benefit or purpose or for the benefit or purpose of any other person, employ, or offer to employ, call on, or actively interfere with the Company’s relationship with any Covered Employee, provided that this Section 8(b) shall not prohibit general solicitations in the form of classified advertisements or the like in newspapers, on the internet, or in other media. This Section 8(b) shall cease to apply upon the occurrence of a Change in Control. For purposes of this Agreement, “Covered Employee” means an employee of the Company who was a vice president or more senior officer of the Company as of the date of the Executive’s termination of employment with the Company.

(c)    The Executive hereby acknowledges that, as an employee of the Company, he will be making use of, acquiring and adding to confidential information of a special and unique nature and value relating to the Company and its strategic plan and financial operations. The Executive further recognizes and acknowledges that all confidential information is the exclusive property of the Company, is material and confidential, and is critical to the successful conduct of the business of the Company. Accordingly, the Executive hereby covenants and agrees that he will use confidential information for the benefit of the Company only and shall not at any time, directly or indirectly, during the Agreement Term and thereafter, divulge, reveal or communicate any confidential information to any person, firm, corporation or entity whatsoever, or use any confidential information for his own benefit or for the benefit of others, other than as required by law or legal process. For purposes of the foregoing, confidential information shall not include information that becomes generally available to the public, other than as a result of disclosure by the Executive.

(d)    Any termination of the Executive’s employment or of this Agreement shall have no effect on the continuing operation of this Section 8 or the Agreement Term.

(e)    The Executive acknowledges and agrees that the Company will have no adequate remedy at law, and could be irreparably harmed, if the Executive breaches or threatens to breach any of the provisions of Section 8(a), (b) or (c). The Executive agrees that the Company shall be entitled to equitable and/or injunctive relief to prevent any breach or threatened breach of such provisions, and to specific performance of each of the terms thereof in addition to any other legal or equitable remedies that the Company may have. The Executive further agrees that he shall not, in any equity proceeding relating to the enforcement of the terms of this Section 8, raise the defense that the Company has an adequate remedy at law. Without limiting the foregoing, if the Executive violates Section 8(a) or has knowledge of the conduct that results in a violation of Section 8(b) (any such violation being a “Forfeiture Event”), then all of the Executive’s outstanding equity awards shall terminate and cease to be

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exercisable as of that date and the Executive shall remit to the Company, in cash, an amount equal to the income recognized by the Executive on the exercise of any stock options during the 90-day period prior to such Forfeiture Event. In addition, if the Executive violates Section 8(a), then, in lieu of any other monetary damages other than the forfeiture of option gains described in the immediately preceding sentence, the Executive shall remit to the Company, in cash, the lump sum payment made to him under Section 4(a)(i) or Section 4(d) (excluding accrued Annual Base Salary earned through the Date of Termination).

(f)    The terms and provisions of this Section 8 are intended to be separate and divisible provisions and if, for any reason, any one or more of them is held to be invalid or unenforceable, neither the validity nor the enforceability of any other provision of this Agreement shall thereby be affected. The parties hereto acknowledge that the potential restrictions on the Executive’s future employment imposed by this Section 8 are reasonable in both duration and geographic scope and in all other respects. If for any reason any court of competent jurisdiction shall find any provisions of this Section 8 unreasonable in duration or geographic scope or otherwise, the Executive and the Company agree that the restrictions and prohibitions contained herein shall be effective to the fullest extent allowed under applicable law in such jurisdiction.

(g)    The parties acknowledge that this Agreement would not have been entered into and the benefits described in Sections 2 or 4 would not have been promised in the absence of the Executive’s promises under this Section 8.

9.    Successors.

(a)    This Agreement is personal to the Executive and without the prior written consent of the Company shall not be assignable by the Executive otherwise than by will or the laws of descent and distribution. This Agreement shall inure to the benefit of and be enforceable by the Executive’s legal representatives.

(b)    This Agreement shall inure to the benefit of and be binding upon the Company and its successors and assigns.

(c)    The Company will require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Company to assume expressly and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such succession had taken place. As used in this Agreement, “Company” shall mean the Company as hereinbefore defined and any successor to its business and/or assets as aforesaid which assumes and agrees to perform this Agreement by operation of law, or otherwise.

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10.    Disputes.

(a)    Arbitration. The Executive and the Company shall attempt in good faith to resolve any controversy or claim between the Executive and the Company arising out of or relating to or concerning this Agreement or any aspect of the Executive’s employment with the Company or the termination of that employment (together, an “Employment Matter”). Failing such agreement, then prior to the occurrence of a Change in Control, and subject to the provisions of this Section 10, any such Employment Matter will be finally settled by arbitration in the County of New York administered by the American Arbitration Association (the “AAA”) under its Commercial Arbitration Rules then in effect. However, the AAA’s Commercial Arbitration Rules will be modified in the following ways: (i) each arbitrator will agree to treat as confidential evidence and other information presented to them, (ii) there will be no authority to award punitive damages (and the Executive and the Company agree not to request any such award), (iii) the proceeding shall be expedited as much as practical consistent with the AAA’s Commercial Arbitration Rules, and (iv) a decision must be rendered within 10 business days of the parties’ closing statements or submission of post-hearing briefs. Notwithstanding the foregoing, any controversy or claim between the Executive and the Company that relates to an Employment Matter and arises after the occurrence of a Change in Control or as to which an arbitration proceeding had not been initiated prior to a Change in Control shall not be subject to mandatory arbitration under this Section 10, and the Executive or the Company may bring an action or special proceeding in a state or federal court of competent jurisdiction to resolve such controversy or claim.

(b)    Injunctions and Enforcement of Arbitration Awards. The Executive or the Company may bring an action or special proceeding in a state or federal court of competent jurisdiction to enforce any arbitration award under Section 10(a). Also, the Company may bring such an action or proceeding, in addition to its rights under Section 10(a) and whether or not an arbitration proceeding has been or is ever initiated, to temporarily, preliminarily or permanently enforce any part of Section 8. The Executive agrees that (w) violating any part of Section 8(a), 8(b) or 8(c) would cause damage to the Company that cannot be measured or repaired, (x) the Company therefore is entitled to an injunction, restraining order or other equitable relief restraining any actual or threatened violation of Section 8(a), 8(b) or 8(c), (y) no bond will need to be posted for the Company to receive such an injunction, order or other relief and (z) no proof will be required that monetary damages for violations of Section 8(a) or Section 8(c) would be difficult to calculate and that remedies at law would be inadequate.

(c)    Waiver of Jury Trial. To the extent permitted by law, the Executive and the Company waive any and all rights to a jury trial with respect to any Employment Matter.

(d)    Payment of Enforcement Costs. Subject to the last sentence of this Section 10(d), the Company agrees to pay as incurred, (within 10 days following the Company’s receipt of an invoice from the Executive), at any time from the Effective Date through the Executive’s remaining lifetime (or, if longer, through the 20^th anniversary of

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the Effective Date) to the full extent permitted by law, all legal fees and expenses which the Executive may reasonably incur as a result of any contest (regardless of the outcome thereof) pursued or defended against in good faith by the Executive regarding the validity or enforceability of, or liability under, any provision of this Agreement or in seeking to obtain or enforce any right or benefit under this Agreement (including as a result of any contest by the Executive about the amount of any payment pursuant to this Agreement), plus in each case interest on any delayed payment at the applicable federal rate provided for in Section 7872(f)(2)(A) of the Code. In order to comply with Section 409A of the Code, in no event shall the payments by the Company under this Section 10(d) be made later than the end of the calendar year next following the calendar year in which such fees and expenses were incurred, provided that the Executive shall have submitted an invoice for such fees and expenses at least 10 days before the end of the calendar year next following the calendar year in which such fees and expenses were incurred. The amount of such legal fees and expenses that the Company is obligated to pay in any given calendar year shall not affect the legal fees and expenses that the Company is obligated to pay in any other calendar year, and the Executive’s right to have the Company pay such legal fees and expenses may not be liquidated or exchanged for any other benefit. With respect to any such contest occurring prior to the occurrence of a Change in Control, the Company’s obligations to the Executive under this Section 10(d) shall not exceed $50,000; provided, that, such $50,000 limit shall not apply if the arbitrator or court, as the case may be, determines that the Company’s position in such dispute was frivolous or not in good faith.

11.    Miscellaneous.

(a)    This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without reference to principles of conflict of laws. The captions of this Agreement are not part of the provisions hereof and shall have no force or effect. This Agreement may not be amended or modified otherwise than by a written agreement executed by the parties hereto or their respective successors and legal representatives.

(b)    All notices and other communications hereunder shall be in writing and shall be given by hand delivery to the other party or by registered or certified mail, return receipt requested, postage prepaid, addressed as follows:

If to the Executive:

Thomas R. Watjen

P.O. Box 281

Lookout Mountain, TN 37350

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, TN 37402

Attention: SVP, Corporate Human Resources

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or to such other address as either party shall have furnished to the other in writing in accordance herewith. Notice and communications shall be effective when actually received by the addressee.

(c)    The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement.

(d)    The Company may withhold from any amounts payable under this Agreement such federal, state, local or foreign taxes as shall be required to be withheld pursuant to any applicable law or regulation.

(e)    The Executive’s or the Company’s failure to insist upon strict compliance with any provision of this Agreement or the failure to assert any right the Executive or the Company may have hereunder, including, without limitation, the right of the Executive to terminate employment for Good Reason pursuant to Section 3(c)(i)-(vii) of this Agreement, shall not be deemed to be a waiver of such provision or right or any other provision or right of this Agreement.

(f)    From and after the Effective Date this Agreement shall supersede any other employment, severance or change of control agreement between the parties with respect to the subject matter hereof.

12.    General Release. All payments under Section 4(a)(i) or 4(d) of this Agreement will be conditioned on the Executive signing prior to the commencement of payments a general form of release substantially in the form attached hereto as Attachment B.

13.    Continuing Obligations. Notwithstanding any expiration of the Agreement Term or anything in this Agreement to the contrary, this Agreement shall continue in effect until expiration of the Non-Renewal Severance Period if the Agreement Term expires pursuant to a Notice of Non-Renewal given by the Company and until full satisfaction of all obligations of the Company hereunder.

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IN WITNESS WHEREOF, the Executive has hereunto set the Executive’s hand and, pursuant to the authorization from its Board of Directors, the Company has caused these presents to be executed in its name on its behalf, all as of the day and year first above written.

EXECUTIVE

/s/ Thomas R. Watjen                

Thomas R. Watjen

UNUM GROUP

By:     /s/ Liston Bishop III            

Name:    Liston Bishop III

Title: Executive Vice President and General Counsel

ATTACHMENT A

RETIREMENT BENEFIT

The Retirement Benefit shall be the benefit provided under the Unum Group Senior Executive Retirement Plan (the “Plan”), as amended and restated effective generally January 1, 2008 and as further amended to be effective December 31, 2013, with the following modifications:

• To the extent that any portion of the Plan incorporates by reference a provision of the Qualified Plan (as such term is defined under the Plan), including the definition of actuarial equivalency in the Qualified Plan, such provision of the Qualified Plan as in effect from time to time shall be applied in determining the Retirement Benefit. In the event such provision includes any grandfathering, protection of accrued benefits or any special transition provision, these modifications should also be applied.

• For purposes of calculating the Retirement Benefit, the Executive shall be considered to be fully vested in his benefit regardless of his age upon termination.

For the avoidance of doubt the Retirement Benefit shall be calculated according to the following methodology:

Thomas R. Watjen

Employment Agreement Retirement Benefit

Employee Data:

Date of Birth

Employment Date

Date of Termination

Age at Termination

Benefit Commencement Date (of Annual Retirement Benefit)

Age at Benefit Commencement (not earlier than age 55)

Earnings (as defined in the Plan)

(based on Qualified Plan pensionable earnings which shall be frozen as of December 31, 2013¹, but without regard to IRC 401(a)(17) limit on compensation, plus amounts deferred under any nonqualified deferred compensation plan)

Final Average Earnings (FAE) (as defined in the Plan)

(effective as of December 31, 2013, FAE for Executive shall be the average of the five highest calendar year Earnings during the ten consecutive calendar years ending on December 31, 2013)

Service

Executive Service (as defined in the Plan), which shall be frozen as of December 31, 2013, up to a maximum of 20 years.

Retirement Benefit:

Retirement Benefit = X – Y – Z, where

X = Gross Annual Retirement Benefit, determined as follows:

(1) Gross Annual Retirement Benefit
(2.5% x Service (max 20 years) x FAE)

(2) Early Retirement Reduction Factor at Benefit Commencement Age
(5% reduction per year from age 60)

(3) Gross Annual Retirement Benefit, Reduced for Early Retirement
(1) x [100%-(2)]

¹   For the avoidance of doubt, this amount will not include any annual incentive award paid in 2014 or thereafter (including with respect to performance in 2013).

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Y = Annual Pension Plan Benefit (Qualified)² 

Z = Annual Supplemental Plan Benefit (Nonqualified)³ 

Commencement of Benefits:

To the extent required by Section 409A of the Code, payment of the 409A Benefit shall commence no sooner than the expiration of six months after the Date of Termination. In addition, payments under this Agreement may be delayed if timely payment is administratively impracticable and the impracticability was unforeseeable, if making a timely payment would jeopardize the ability of Company to continue as a going concern, or if deduction of the payment is restricted by Section 162(m) of the Code and a reasonable person would not have anticipated that restriction at the time the legally binding right to the payment arose. In each case, payment must be made as soon as the reason for the delay ceases to exist.

²  Refers to the accrued annual benefit under the Qualified Plan, which shall be frozen as of December 31, 2013.

³   Refers to the accrued annual benefit under the Unum Group Supplemental Pension Plan, as amended and restated effective generally January 1, 2010 and subsequently amended on two occasions thereafter, which shall be frozen as of December 31, 2013.

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ATTACHMENT B

GENERAL RELEASE

For and in consideration of the payment, mutual promises, covenants, and agreements made by and between you and Unum Group in the Agreement originally dated as of March 31, 2003, as subsequently amended and/or restated, to which this General Release is attached as Attachment B, you unconditionally and generally release Unum Group from each and every action, claim, right, liability or demand of any kind and nature, and from any claims which may be derived therefrom, that you had, have, or might hereafter claim to have against Unum Group or any employee, agent, successor or predecessor of Unum Group at common law, public policy or otherwise, particularly including, but not by way of limitation, the following: all claims for personal injury, including negligent infliction of emotional distress; any claim arising under the Age Discrimination in Employment Act of 1967, as amended; Title VII of the Civil Rights Act of 1991; the Americans with Disabilities Act of 1990; the Rehabilitation Act of 1973; the Fair Labor Standards Act; the National Labor Relations Act; Sections 1981 through 1988 of Title 42 of the United States Code; the Immigration Reform and Control Act; the False Claims Act; the Occupational Safety and Health Act; the Worker Adjustment and Retraining Notification Act; the Employment Retirement Income Security Act of 1974 (save for a benefit claim as provided below); any other federal, state or local law dealing with discrimination in employment on the basis of sex, race, color, national origin, religion, disability, age, sexual orientation or any other grounds; any claim for unpaid compensation or unpaid bonus; any claim for wrongful discharge or breach of contract; and any other claims based on tort, whether based on common law, public policy or otherwise. It is your intent to release all claims of every nature and kind whether known or unknown, accrued or unaccrued, which you may have against Unum Group as of the date of the execution of this General Release.

It is expressly understood and agreed by you that this General Release does not include your vested rights, if any, in the Unum Group Senior Executive Retirement Plan, Unum Group Supplemental Pension Plan, Unum Group Pension Plan or in the Unum Group 401(k) Retirement Plan, any other rights you may have to benefits under Unum Group’s welfare benefit plans, and rights you may have to coverage under Unum Group’s professional liability insurance policies, including any directors and officers liability insurance, or any vested rights you may have under a stock option or long term incentive plan, or any rights to deferred compensation. Such retirement plan, welfare plan, stock options or deferred compensation rights survive unaffected by this release, subject to the laws and plan documents governing those plans.

This General Release does not include any rights or claims against Unum Group or those associated with Unum Group that you may have which arise after the date you sign the General Release, or any claim that you may have to unemployment compensation or workers’ compensation benefits, or any claim you may have to indemnification in accordance with the provisions of the Unum Group Certificate of Incorporation or Bylaws.

EXECUTIVE

Thomas R. Watjen
Date:

UNUM GROUP

Name:
Title:

Date:

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EX-10.31

UNUM GROUP NON-QUALIFIED DEFINED CONTRIBUTION RETIREMENT PLAN

Effective January 1, 2014

Table of Contents

ARTICLE I     Definitions    1

ARTICLE II     Plan Benefits    5

2.1    Elective Deferrals    5

2.2    Matching Deferrals    6

2.3    Nonelective Deferrals    7

2.4    Nonelective Transition Deferrals    7

2.5    Deferrals of Amounts that Exceed Code Section 415 Limit    7

2.6    Vesting    8

2.7    Death Benefits    8

ARTICLE III    Accounts and Notional Investment Experience    8

3.1    Accounts    8

3.2    Participant Investment Directions    8

ARTICLE IV     Distributions    9

4.1    Time of Distribution to Participants    9

4.2    Distribution upon becoming Disabled    10

4.3    Distribution upon Death    10

4.4    Distribution pursuant to Domestic Relations Order    10

4.5    Form of Distribution    11

4.6    Cashouts    11

4.7    Other Limitations    12

ARTICLE V     Administration    12

5.1    Allocation of Responsibility    12

5.2    Claims Procedure    12

5.3    Agents    14

5.4    Indemnification    14

ARTICLE VI    Miscellaneous    14

6.1    Reemployed Former 401(a)(17) Participant    14

6.2    Amendment and Termination    15

6.3    Delegation by Participating Employers    15

6.4    Employee Status    16

6.5    Funding    16

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6.6    Assignment    16

6.7    Taxes    16

6.8    Governing Law    16

6.9    Compliance with Code Section 409A    16

UNUM GROUP NON-QUALIFIED DEFINED CONTRIBUTION RETIREMENT PLAN

PREAMBLE

The purpose of the Plan is (1) to provide Employees with a retirement benefit based on Compensation in excess of the annual limit under Code Section 401(a)(17) and (2) to provide Employees with contributions that would be made to the Qualified Plan but for the limitations imposed by Code Section 415. Participation in the Plan shall be limited to a select group of management or highly compensated employees within the meaning of ERISA. This Plan is adopted effective January 1, 2014.

ARTICLE I

Definitions

The following terms, when used herein, shall have the meanings as hereinafter set forth, unless the context clearly indicates otherwise:

1.1    “Account” means a bookkeeping account established under the Plan for each Participant which shall reflect separately the Participant’s (a) elective deferrals, if any, under Section 2.1 and the notional income, expenses, gains and losses of the Investment Funds attributable thereto; (b) matching deferrals, if any, under Section 2.2 and the notional income, expenses, gains and losses of the Investment Funds attributable thereto; (c) nonelective deferrals under Section 2.3, if any, and the notional income, expenses, gains and losses of the Investment Funds attributable thereto; (d) nonelective transition deferrals, if any, under Section 2.4 and the notional income, expenses, gains and losses of the Investment Funds attributable thereto; and (e) the excess Code Section 415 deferrals, if any, under Section 2.5 and the notional income, expenses, gains and losses of the Investment Funds attributable thereto.

1.2    “Affiliate” means any corporation which is a member of a controlled group of corporations (as defined in Code Section 414(b)) that includes an Employer; or any trade or business, whether or not incorporated which is under common control (as defined in Code Section 414(c)) with an Employer; or any service organization which is a member of an affiliated service group (as defined in Code Section 414(m)) that includes an Employer; and any successor to any of the foregoing.

1.3    “Beneficiary” means the person or persons designated by a Participant as provided in Section 4.3 to receive any benefits payable under the Plan following the death of the Participant.

1.4    “Board” or “Board of Directors” means the Board of Directors of the Company, or any person or persons to whom the Board delegates all or part of its authority under this Plan.

1.5    “Code” means the Internal Revenue Code of 1986, as amended.

1.6    “Company” means Unum Group or any corporation with or into which it may be merged or consolidated.

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1.7    “Compensation” means, with respect to any Plan Year, the amount determined under subsection (a) as reduced by subsection (b), and subject to subsection (c).

(a)    The total compensation paid by an Employer to the Employee that:

(i)    constitutes wages as defined in Code Section 3401(a) and all other payments made by an Employer to the Employee for services rendered while a Participant for which the Employer is required to furnish the Employee a written statement under Code Sections 6041(d), 6051(a)(3) and 6052, determined without regard to any rules under Code Section 3401(a) that limit the remuneration included in wages based on the nature or location of the employment or services performed, plus elective contributions made by an Employer on behalf of the Employee that are not includable in income under Code Section 125, 132(f)(4) or 402(e)(3) and any amounts deferred at the election of the Participantunder this Plan or any other nonqualified deferred compensation plan of an Employer, plus, with respect to the initial Plan Year of participation, Performance Based Compensation for services rendered prior to becoming a Participant; and

(ii)    exceeds the annual limit under Code Section 401(a)(17), as adjusted for cost-of-living increases in accordance with Code Section 401(a)(17)(B), for such year.

Compensation described in this subsection (a) shall also include remuneration paid by a foreign Affiliate to an individual who is treated as an Employee, to the extent such remuneration would constitute Compensation if paid by an Employer.

(b)    The amount determined in subsection (a) above shall be reduced as follows:

(i)    In the case of an Employee who is not on a program of variable sales incentive compensation: bonuses, prizes and awards, commissions and overrides, consultants’ fees, lump sum payments to the Employee in lieu of annual salary increases, and long term incentive payments whether paid in cash or in kind (including restricted stock units and stock options), other than Performance Based Compensation;

(ii)    In the case of an Employee who is on a program of variable sales incentive compensation: amounts paid by an Employer as a result of sales contest participation, and any other prize, bonus, award or other irregular payment that is not a recognized sales-based incentive, other than Performance Based Compensation; and

(iii)    In the case of all Employees: allowances for incidentals, payments on account of termination of employment, including but not limited to payments for severance and unused accrued bona fide sick, vacation or other leave,

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reimbursements or other expense allowances, fringe benefits (cash and non-cash), moving expenses, payments ofdeferred compensation, welfare benefits (other than salary continuation payments or short term disability payments), and legal settlements or judgments (except to the extent required by a judicially-approved settlement, a judgment or a related court order).

(c)    With respect to an Employee who is not in qualified military service (as that term is defined in Code Section 414(u)) and who is not permanently and totally disabled (as defined in Code Section 22(e)(3)), Compensation paid after the Employee ceases to be employed by an Employer shall be disregarded, unless it is paid by the later of: (i) 2½ months after the date he or she ceases to be employed by an Employer and is no longer employed by any Employer, or (ii) the end of the Plan Year that includes the date he or she ceases to be employed by an Employer and is no longer employed by any Employer. Notwithstanding the preceding sentence to the contrary, Performance Based Compensation and variable sales incentive compensation paid after an Employee ceases to be employed by an Employer and is no longer employed by any Employer shall be disregarded.

1.8    “Disabled” means the Participant is, by reason of any medically determinable physical or mental impairment that can be expected to result in death or last for a continuous period of not less than 12 months, receiving benefits for a period of not less than 3 months under the Unum Group Employees Long-Term Disability Plan.

1.9    “Employee” means an employee as defined in the Qualified Plan.

1.10    “Employer” means the Company and any Affiliate that adopts the Plan with the consent of the Board.

1.11    “ERISA” means the Employee Retirement Income Security Act of 1974, as amended.

1.12    “Investment Funds” means the investment options selected by the Company or its delegate in which Participants’ Accounts shall be deemed invested to measure notional investment returns under the Plan.

1.13    “Key Employee” means a key employee as defined in Code Section 416(i) and the regulations thereunder, without regard to Code Section 416(i)(5). For purposes of the Plan:

(a)    The compensation taken into account for Key Employee determinations shall be “Section 415 Compensation” as defined in the Unum Group Pension Plan; and

(b)    Whether a Participant is a Key Employee on his or her Termination of Employment date or date of death, whichever applies, shall be determined in accordance with Treasury Regulation § 1.409A-1(i), or any successor thereto. The identification date shall be December 31, and the identification shall apply for the 12-month period beginning on the next following April 1 (the specified employee effective date).

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1.14    “Participant” means any Employee who:

(a)    an Employer identifies as eligible to participate in the Plan by providing notice to the Plan Administrator (a “401(a)(17) Participant”); or

(b)    is a participant in the Qualified Plan and whose contributions under such plan are limited by Code Section 415 (a “415 Spillover Participant”).

An Employee shall cease to be a Participant as of the date he or she ceases to be a member of a select group of management or highly compensated employees within the meaning of ERISA.

1.15    “Performance Based Compensation” means Compensation paid pursuant to the Company’s Performance Based Incentive Plan.

1.16    “Plan” means the Unum Group Non-Qualified Defined Contribution Retirement Plan as set forth herein and as subsequently amended from time to time.

1.17    “Plan Administrator” means the Vice President-HR/Benefits of Unum Group, and any person or entity to which the Plan Administrator delegates all or a part of his or her authority under the Plan.

1.18    “Plan Year” means the calendar year.

1.19    “Qualified Plan” means the Unum Group 401(k) Retirement Plan.

1.20    “Termination of Employment” and “Terminates Employment” mean or refer to a severing of the employment relationship between an individual and the Company and all Affiliates where all parties reasonably anticipate that no further services will be performed after the termination date or that the level of bona fide services the individual will perform after such date (either as an employee or an independent contractor) will permanently decrease to no more than 20% of the average level of bona fide services performed (either as an employee or independent contractor) over the immediately preceding 36-month period or the full period of service for the Company and all Affiliates, if less than 36 months. A Termination of Employment does not occur if the individual is on military leave, sick leave, or other bona fide leave of absence, provided the leave of absence does not exceed 6 months or such longer period as the individual retains a right to reemployment pursuant to statute or contract, and there is a reasonable expectation that the individual will return to perform services for the Company or any Affiliate. This Section shall be interpreted and applied in accordance with Treasury Regulation § 1.409A-1(h).

1.21    “Valuation Date” means each business day on which the New York Stock Exchange is open.

1.22    “Year of Participation Service” means a year of participation service as defined in the Qualified Plan.

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ARTICLE II

Plan Benefits

2.1    Elective Deferrals. A 401(a)(17) Participant may elect to defer Compensation each payroll period in accordance with this Section.

(a)    A deferral election shall be made by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator. Except as hereinafter provided, a 401(a)(17) Participant may not defer less than 1% nor more than 50% of his or her Compensation each payroll period. The deferral percentage must be a whole number.

(b)    Once each Plan Year, from June 1 until June 30, a 401(a)(17) Participant may elect to defer Compensation (other than Performance Based Compensation) payable for services to be performed in the next Plan Year and Performance Based Compensation payable in the next Plan Year. The first June 1 – June 30 annual election period for a newly eligible 401(a)(17) Participant shall be the June 1 – June 30 of the Plan Year following the Plan Year in which the 30-day period set forth in subsection (d) below expires (unless such 30-day period spans two Plan Years and the Participant makes his or her initial election to defer Compensation in the first Plan Year, in which case his or her first annual election period shall be the June 1 – June 30 of the Plan Year following the Plan Year in which the election is made).

(c)    For the Plan Year beginning January 1, 2014, a 401(a)(17) Participant on or before September 30, 2013 may elect to defer up to: (i) 50% of his or her Compensation (other than Performance Based Compensation) payable for services to be performed in such year, and (ii) 50% of the portion of his or her Performance Based Compensation payable in such year that may be taken into account under this Plan (i.e., 25%), and the percentage elected (from 1% to 50%) must be the same for Compensation described in clauses (i) and (ii). Such election shall be made from September 1, 2013, until September 30, 2013.

(d)    Effective October 1, 2013, a newly eligible 401(a)(17) Participant may, within 30 days after becoming eligible, elect to defer Compensation (other than Performance Based Compensation) payable for services to be performed in the Plan Year following the Plan Year in which his or her election is made (or, at the discretion of the Vice President – Human Resources/Benefits of Unum Group, for services to be performed (after the last day of such 30-day period) in the Plan Year in which his or her election is made, in the case of an executive hire) and Performance Based Compensation payable in the Plan Year following the Plan Year in which the election is made. An election during the 30-day period to defer Compensation shall, with respect to Performance Based Compensation payable in the Plan Year following the Plan Year in which the election is made, apply to only a portion of such compensation determined in accordance with the following schedule:

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Calendar Quarter in                 Portion of Performance

which Election is MadeBased Compensation

January 1 – March 31                    75%

April 1 – June 30                    50%

July 1 – September 30                    25%

October 1 – December 31                  0%

(e)    An election to defer Compensation pursuant to this Section 2.1 shall be irrevocable as of the last day of the applicable election period and shall continue in effect until the earliest of:

(i)    the end of the Plan Year in which it is modified or terminated pursuant to this subsection (e);

(ii)    the date it is cancelled pursuant to this subsection (e); and

(iii)    the date the Participant ceases to be a member of a select group of management or highly compensated employees within the meaning of ERISA.

A Participant may modify or terminate an election to defer Compensation only during the June 1 – June 30 annual election period each Plan Year, and such modification or termination shall be effective as of the first day of the next Plan Year.

In the event a Participant receives a hardship distribution from the Qualified Plan, his or her election to defer Compensation under this Plan shall be cancelled for a period of 6 months beginning immediately after he or she receives the hardship distribution (or for the remainder of the Plan Year in which the hardship distribution is made, if longer).

(f)    Notwithstanding any other provision of the Plan, an election to defer Compensation pursuant to subsection (b) or modification of an election to defer Compensation pursuant to subsection (e) shall be effective with respect to Performance Based Compensation payable in the Plan Year following the Plan Year in which the election or modification is made only if the Participant has performed services continuously from the later of the beginning of the performance period or the date the performance criteria are established through the date his or her election or modification is made, and the election or modification is made before such Performance Based Compensation is readily ascertainable within the meaning of Treasury Regulation § 1.409A-2(a)(8).

2.2    Matching Deferrals. For each payroll period, each Employer shall make matching deferrals on behalf of each 401(a)(17) Participant in its employ who defers Compensation under Section 2.1 for such year and who has completed one Year of Participation Service. Matching deferrals shall be made at the rate of $1.00 for each dollar of Compensation deferred under Section 2.1 with respect to payroll periods beginning on or after the date the Participant completes one Year of Participation Service, up to 5% of his or her Compensation for such payroll periods.

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2.3    Nonelective Deferrals. For each payroll period, each Employer shall make nonelective deferrals on behalf of each 401(a)(17) Participant in its employ who has completed one Year of Participation Service in an amount equal to 4.5% of his or her Compensation for such payroll period, beginning with the first payroll period that coincides with or next follows the date he or she completes one Year of Participation Service; provided, with respect to the Plan Year in which the Participant first completes one Year of Service, the amount of nonelective deferrals to be made in accordance with this Section 2.3 for any payroll period shall be reduced by the amount of any nonelective contributions made on such Participant’s behalf under Section 3.10 of the Qualified Plan for such payroll period.

2.4    Nonelective Transition Deferrals. For each payroll period beginning on or after January 1, 2014 and beginning on or before December 31, 2020, each Employer shall make nonelective transition deferrals on behalf of each 401(a)(17) Participant in its employ who meets the requirements of this Section in an amount equal to 7% of his or her Compensation for such payroll period (such percentage having been determined with reference to the design of the Qualified Plan, under which transition contributions are made on behalf of eligible participants in an amount equal to the sum of (i) 3.5% of their compensation as defined in such plan and (ii) 3.5% of the amount of their compensation as so defined in excess of $70,000; and Compensation herein being amounts in excess of the annual limit under Code Section 401(a)(17)). A Participant meets the requirements of this Section if:

(a)    he or she is an active Employee on January 1, 2014; and

(b)    as of December 31, 2013:

(i)    the sum of his or her years of age (rounded down to the nearest whole number) and years of vesting service (rounded down to the nearest whole number) is at least 60, and he or she is credited with at least 15 years of vesting service; or

(ii)    he or she is credited with at least 10 years of vesting service and has attained age 50.

For purposes of this Section, a “year of vesting service” means a year of vesting service as defined in the Unum Group Pension Plan.

2.5    Deferrals of Amounts that Exceed Code Section 415 Limit. For each payroll period beginning on or after January 1, 2014 and beginning on or before December 31, 2020, each Employer shall make deferrals on behalf of each 415 Spillover Participant in its employ in an amount equal to the contributions that would have been made on his or her behalf under the Qualified Plan for such payroll period but for the limit on annual additions under Code Section 415. In the event a Participant receives a hardship distribution from the Qualified Plan, amounts to be deferred under this Section consisting of the elective contributions (and matching contributions) that would have been made on his or her behalf under the Qualified Plan shall be cancelled for a period of 6 months

7

beginning immediately after he or she receives the hardship distribution (or for the remainder of the Plan Year in which the hardship distribution is made, if longer).

2.6    Vesting. All amounts deferred under this Plan shall be fully vested and nonforfeitable.

2.7    Death Benefits. In the event of a Participant's death, his or her Account shall be paid in accordance with the provisions of Section 4.3.

ARTICLE III

Accounts and Notional Investment Experience

3.1    Accounts. The Company (or its designated agent) shall establish an Account for each Participant and shall adjust such account as of each Valuation Date as follows:

(a)    First, determine the fair market value of each Investment Fund as of the close of business on such date.

(b)    Second, allocate the notional income, expenses, gains and losses of each Investment Fund among the Accounts in proportion to the Account balances (to the extent deemed invested therein) as of the close of business on the preceding Valuation Date.

(c)    Third, reduce the separate Account of each Participant to reflect all deemed distributions made from such Account since the preceding Valuation Date.

(d)    Fourth, credit to the separate Account of each Participant the deferrals made on his or her behalf under Article II since the preceding Valuation Date.

(e)    Fifth, adjust each Participant’s Account to reflect deemed transfers among the Investment Funds, if any.

A Participant’s Account shall continue to be adjusted for notional investment experience until all amounts credited to the Account have been distributed in accordance with Article IV.

3.2    Participant Investment Directions. Each Participant may direct that deferrals made on his or her behalf under this Plan shall be deemed invested in any one or more of the Investment Funds; provided the percentage of deferrals to be deemed invested in any Investment Fund shall be 1%, or a multiple thereof. An investment direction shall be made by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator.

A Participant’s investment direction, if received by the Plan Administrator (or its designated agent) prior to the date he or she commences participation, shall be effective as of said date. If a Participant does not make an investment direction or an investment direction is not received by the Plan Administrator (or its designated agent) before the Participant commences participation, the deferrals made on behalf of such Participant shall be deemed invested in the Investment Fund designated by the Company or its delegate for such purpose. An investment direction received by

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the Plan Administrator (or its designated agent) after the date a Participant commences participation shall be effective as soon as practicable after receipt by the Plan Administrator (or its designated agent).

A Participant may modify at any time an investment direction to have future deferrals made on his or her behalf under the Plan deemed invested in the Investment Funds in proportions other than those previously elected. An election modifying a previous investment direction shall be made in multiples of 1% of such deferrals and shall be made by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator. A modification shall be effective as soon as practicable after receipt by the Plan Administrator (or its designated agent), subject to any restrictions set forth in the prospectus for the applicable Investment Fund.

Subject to such restrictions under any other agreement as may apply with respect to transfers between competing Investment Funds, a Participant, his or her surviving spouse or Beneficiary, as the case may be, may elect at any time a deemed reinvestment of all or a portion of the balance of his or her Account in any one or more of the Investment Funds. An election to reinvest all or a portion of an Account balance shall be made in 1% multiples of such balance, specified dollar amounts or specified number of shares/units (as specified by the Participant, or his or her surviving spouse or Beneficiary) and shall be made by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator. An election to reinvest all or a portion of an Account balance shall be effective as soon as practicable after receipt by the Plan Administrator (or its designated agent).

The Company or its delegate may from time to time add or eliminate Investment Funds. Whenever an Investment Fund is eliminated, the portion of Participants’ Accounts deemed invested therein shall be deemed reinvested in such other Investment Fund as the Company or its delegate may direct, unless a Participant, surviving spouse or Beneficiary, pursuant to this Section, elects the deemed reinvestment of all or a portion of the balance of his or her Account which had been invested in the eliminated Investment Fund in one or more of the other available Investment Funds.

ARTICLE IV

Distributions

4.1    Time of Distribution to Participants.

(a)    Except as provided in subsection (b), Section 4.2 or Section 4.6, distribution of a Participant’s Account to the Participant shall be made or commence as soon as administratively practicable following the date determined in accordance with (i) or (ii) below, whichever is applicable:

(i)    If the Participant made an effective transition election pursuant to Section 3.04 of the Unum Group Supplemental Pension Plan, the date determined in accordance with such election; or

9

(ii)    For any other Participant, the later of the date on which he or she attains age 60 and the date on which he or she Terminates Employment.

(b)    Notwithstanding any other provision of the Plan to the contrary, in the case of a Participant who is a Key Employee on his or her Termination of Employment date, distribution shall be made or commence as of the later of: (i) the date distribution otherwise would be made or commence without regard to this subsection (b), and (ii) the 6-month anniversary of the Participant’s Termination of Employment date or, if earlier, the Participant’s date of death.

4.2    Distribution upon becoming Disabled. In the event a Participant becomes Disabled, he or she may request that distribution of his or her Account be made or commence as soon as administratively practicable thereafter; provided, however, if a Participant is a Key Employee on his or her Termination of Employment Date and becomes Disabled after such date, distribution may not be made or commence prior to the date determined under Section 4.1(b)(ii).

4.3    Distribution upon Death. In the event a Participant dies before distribution of his or her Account has been made or commenced, his or her Account shall be distributed to his or her surviving spouse, or, if the Participant is not survived by a spouse or the Participant’s spouse consents in the manner provided below, to his or her Beneficiary, as soon as administratively practicable after the date of the Participant’s death in the form determined in accordance with Section 4.5.

In the event a Participant dies after distribution of his or her Account has commenced but before all payments have been made, the remaining Account balance shall continue to be distributed to his or her surviving spouse, or, if the Participant is not survived by a spouse or the Participant’s spouse consents in the manner provided below, to his or her Beneficiary, in accordance with the form of distribution in effect as of the Participant’s date of death.

To be effective, the consent of a Participant’s surviving spouse to the Participant’s designated Beneficiary must meet the requirements set forth in Section 9.3 of the Qualified Plan; provided no spousal consent shall be required to designate a nonspouse Beneficiary under the circumstances described in Section 9.3 of the Qualified Plan.

Subject to the preceding provisions of this Section, each Participant from time to time may designate any person or persons (who may be designated concurrently, contingently or successively) to receive any benefits payable upon his or her death. Each Beneficiary designation shall revoke all prior designations by the Participant and shall be effective only when filed with the Plan Administrator (or its designated agent) during the Participant’s lifetime by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator. If a Participant fails to designate a Beneficiary, distribution shall be made to the person(s) and in the order determined in accordance with the provisions of Section 9.3 of the Qualified Plan.

4.4    Distribution pursuant to Domestic Relations Order. Distribution of a Participant’s Account under the Plan shall be subject to the terms of any domestic relations order with respect to the Participant that the Plan Administrator (or its designated agent for such purpose) determines

10

would be a qualified domestic relations order within the meaning of Code Section 414(p) if this Plan were a tax-qualified retirement plan, including any such order that accelerates the time or schedule of a payment under the Plan.

4.5    Form of Distribution. A 401(a)(17) Participant may elect that distribution of his or her Account be made in one of the following forms:

(a)    a single lump sum;

(b)    annual, equal installments over 5 calendar years; or

(c)    annual, equal installments over 10 calendar years.

The amount of each installment shall be calculated by multiplying the current balance of the Participant’s Account by a fraction, the numerator of which is one and the denominator of which is the number of installments remaining to be paid.

A 401(a)(17) Participant’s election shall be made by such written, telephonic or electronic means as shall be prescribed by the Plan Administrator, shall be irrevocable as of the last day of the applicable election period, and shall apply to the Participant’s entire Account; provided, however, if any amount deferred under Section 2.5 was credited to the Participant’s Account before the date of his or her election under this Section, the election shall not apply to the portion of his or her Account that is attributable to all amounts deferred under Section 2.5, and such portion of the Participant’s Account shall be paid in a single lump sum.

In the case of a 401(a)(17) Participant on or before September 30, 2013, such election shall be made from September 1, 2013, until September 30, 2013. In the case of any other 401(a)(17) Participant, such election shall be made within 30 days after he or she becomes a 401(a)(17) Participant. If a 401(a)(17) Participant fails to elect a form of distribution within the prescribed time, his or her entire Account shall be distributed in a single lump sum.

Distribution of the Account of a 415 Spillover Participant who is not also a 401(a)(17) Participant shall be made in a single lump sum.

All distributions shall be made in cash.

4.6    Cashouts. Notwithstanding any other provision of the Plan to the contrary, if the value of a Participant’s Account does not exceed $15,000 as of the administrative processing date, such Account shall be paid in the form of a single lump sum payment as soon as administratively practicable after such date; provided, however, in the case of Termination of Employment of a Participant who is a Key Employee, payment shall be made as soon as administratively practicable after the 6-month anniversary of the Participant’s Termination of Employment date (or, if earlier, the Participant’s date of death). For this purpose, the Participant’s Account shall mean his or her entire interest under this Plan and all other agreements, methods, programs or other arrangements required to be aggregated with this Plan under Treasury Regulation § 1.409A-1(c)(2).

11

“Administrative processing date” shall mean the Valuation Date as of which the Plan Administrator (or its designated agent), in the normal course, is notified by the Company of the Participant’s Termination of Employment or death.

4.7    Other Limitations. No Plan loans to or hardship withdrawals by Participants shall be permitted.

ARTICLE V

Administration

5.1    Allocation of Responsibility. The Plan Administrator shall be responsible for and shall have complete discretionary authority to control and manage the operation and administration of the Plan and to interpret and construe Plan provisions, including determining eligibility for benefits, and his or her final decision on appeal shall not be disturbed except upon judicial determination of abuse of discretion.

Subject to the provisions of this Plan, the Plan Administrator from time to time may establish rules for the administration and interpretation of the Plan. All actions, decisions and interpretations of the Plan Administrator shall be made in a uniform and nondiscriminatory manner.

5.2    Claims Procedure.

(a)    An individual claiming benefits under the Plan (or his or her duly authorized representative) may file his or her claim with the Plan Administrator by such written, telephonic or electronic means as the Plan Administrator shall prescribe. The claim shall be filed with:

Vice President - HR/Benefits

UnumGroup

2211 Congress Street MS-A153

Portland, ME 04122

If a claim for Plan benefits is wholly or partially denied, the Plan Administrator shall furnish the claimant with written or electronic notification of the adverse benefit determination. The notification shall set forth in a manner calculated to be understood by the claimant:

(i)    the specific reason or reasons for the adverse benefit determination;

(ii)    reference to the specific Plan provisions on which the determination is based;

(iii)    a description of any additional material or information necessary for the claimant to perfect his or her claim and an explanation why such material or information is necessary; and

12

(iv)    a description of the Plan’s procedures for review of an adverse benefit determination and the time limits applicable to such procedures, including a statement of the claimant’s right to bring a civil action under Section 502(a) of ERISA following an adverse benefit determination on review.

The notification shall be furnished to the claimant within 90 days after receipt of his or her claim, unless special circumstances require an extension of time for processing such claim. If an extension of time for processing is required, the Plan Administrator shall, prior to the termination of the initial 90-day period, furnish the claimant with written notice indicating the special circumstances requiring an extension of time and the date by which the Plan Administrator expects to render the benefit determination. In no event shall an extension exceed a period of 90 days from the end of the initial 90-day period.

(b)    A claimant or his or her authorized representative may appeal an adverse benefit determination by filing a written request for review with the Plan Administrator within 60 days after receipt by the claimant of the notification of such adverse benefit determination. The claimant or his or her duly authorized representative:

(i)    may submit to the Plan Administrator written comments, documents, records, and other information relating to the claim for benefits; and

(ii)     shall be provided, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information relevant to the claim for benefits.

The Plan Administrator’s review of any adverse benefit determination shall take into account all comments, documents, records and other information submitted by the claimant or his or her authorized representative relating to the claim, without regard to whether such information was submitted or considered in the initial benefit determination.

(c)    The Plan Administrator shall provide the claimant with written or electronic notification of the benefit determination on review not later than 60 days after receipt of a request for review, unless special circumstances require an extension of time for processing. If an extension of time for processing is required, the Plan Administrator shall, prior to the termination of the initial 60-day period, furnish the claimant with written notice indicating the special circumstances requiring an extension of time and the date by which the Plan Administrator expects to render the determination on review. In no event shall such extension exceed a period of 60 days from the end of the initial 60-day period.

In the case of an adverse benefit determination, the notification shall set forth in a manner calculated to be understood by the claimant:

(i)    the specific reason or reasons for the adverse determination;

13

(ii)    reference to the specific Plan provisions on which the determination is based;

(iii)    a statement that the claimant is entitled to receive, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information relevant to the claimant’s claim for benefits; and

(iv)    a statement of the claimant’s right to bring a civil action under Section 502(a) of ERISA.

(d)    Notwithstanding the foregoing provisions to the contrary, a claim for benefits based on the Participant becoming Disabled shall be made and processed in accordance with the claims procedures under the Unum Group Employees Long-Term Disability Plan.

(e)    Before pursuing a legal remedy, a claimant shall first exhaust all claims, review and appeals procedures under the Plan. A claimant may bring a legal action against the Plan, Unum Group or any other Employer, the Board, the Plan Administrator, or any other person, or the employees or agents of these entities, only in the United States District Court in Portland, Maine or Chattanooga, Tennessee. Such legal action may not be brought more than one year after the final disposition of the claim under this Section. The agent for service of legal process on the Plan shall be:

Vice President, Employment Law

Unum Group

1 Fountain Square

Chattanooga, TN 37402

5.3    Agents. The Plan Administrator may employ counsel and other agents, may delegate ministerial duties to such agents or to employees of the Company and may procure such clerical, accounting, consulting and other services as it may require in carrying out the provisions of the Plan.

5.4    Indemnification. To the extent permitted by applicable law, the Company and the other Employers shall indemnify and save harmless the Plan Administrator against all expenses and liabilities arising out of his or her acts or omissions with respect to the Plan, provided he or she would be entitled to indemnification pursuant to the bylaws of the Company or the affected Employer, as the case may be.

ARTICLE VI

Miscellaneous

6.1    Reemployed Former 401(a)(17) Participant. In the event a 401(a)(17) Participant Terminates Employment, begins receiving distribution of his or her Account in the form of installments, and becomes reemployed by an Employer or Affiliate prior to the date the last installment payment is to be made, payment of the portion of his or her Account attributable to

14

amounts deferred before such termination shall continue to be made in accordance with his or her election under Section 4.5.

A 401(a)(17) Participant who is reemployed by an Employer shall be treated as a newly eligible 401(a)(17) Participant as of the date he or she again becomes a 401(a)(17) Participant, for purposes of electing to defer Compensation pursuant to Section 2.1 and electing the form of distribution of the portion of his or her Account that is attributable to amounts deferred after his or her reemployment date, if he or she is described in (a) or (b) below:

(a)    the Participant has been paid all amounts deferred under the Plan and on or before the date of the last payment was not eligible to continue (or elect to continue) to participate in the Plan; or

(b)    regardless of whether all amounts deferred under the Plan have been paid, the Participant has not been eligible to participate in the Plan (other than the accrual of earnings) at any time during the 24-month period ending on the date he or she again becomes a 401(a)(17) Participant.

A 401(a)(17) Participant who is reemployed by an Employer but who is not described in (a) or (b) above may not elect to defer Compensation pursuant to Section 2.1 until the first June 1 – June 30 annual election period following his or her reemployment date (or the June 1 – June 30 annual election period in which his or her reemployment date occurs, if earlier), and such election shall be effective with respect to (1) Compensation (other than Performance Based Compensation) payable for services to be performed in the Plan Year next following such annual election period; and (2) Performance Based Compensation payable in the Plan Year next following such annual election period, subject to Section 2.1(f). Payment of the portion of such 401(a)(17) Participant’s Account that is attributable to amounts deferred after his or her reemployment date shall be made in the same form as payment of the portion of his or her Account that is attributable to amounts deferred prior to his or her Termination of Employment.

6.2    Amendment and Termination. The Board may at any time, in its sole discretion, terminate this Plan or amend this Plan in whole or in part. No such termination or amendment shall affect the right of any Participant, his or her surviving spouse or Beneficiary, as the case may be, to receive or continue to receive a benefit under the terms of this Plan on the date immediately preceding such termination or amendment. In the event the Plan is terminated, Participants’ Accounts shall be distributed at such time and in such form as shall comply with the requirements of Code Section 409A and related regulations.

6.3    Delegation by Participating Employers. Each Affiliate that adopts the Plan hereby irrevocably grants to the Company, the Board and the Plan Administrator the exclusive authority to exercise all of the powers conferred on them by the terms of the Plan, including the power vested in the Board to amend the Plan and the power vested in the Board to terminate the Plan, and hereby appoints the Company, the Board and the Plan Administrator as its agents for such purposes. In addition, each Affiliate that adopts the Plan shall, to the extent not assumed by the Company, accept

15

the obligations and responsibilities otherwise imposed on the Company by the terms of the Plan with respect to any Participant who is its Employee without further action on its part.

6.4    Employee Status. Nothing contained herein will confer upon any Participant the right to be retained in the service of the Company and its Affiliates or any other right not expressly provided for herein, nor will the existence of this Plan impair the right of the Company and its Affiliates to discharge or otherwise deal with a Participant.

6.5    Funding. This Plan is unfunded for purposes of the Code and Title I of ERISA and is not intended to meet the requirements of Code Section 401(a). The Plan constitutes a mere promise by the Company and the other Employers to pay benefits in the future, and a Participant hereunder shall have no greater rights than a general, unsecured creditor of the Company and the other Employers. The Company and each other Employer shall be solely responsible for the payment of benefits with respect to its own Employees who are Participants in the Plan.

6.6    Assignment. To the maximum extent permitted by law, no benefit under this Plan shall be assignable or subject in any manner to alienation, sale, transfer, claims of creditors, pledge, attachment or encumbrances of any kind.

6.7    Taxes. Any and all taxes that may be due and owing with respect to any payment under the Plan shall be the sole responsibility of the persons to whom and for whose benefit such payment is made; provided, however, the Company and each other Employer, as applicable (or their designated agents), shall withhold from any payment made under the Plan all amounts that are required by law to be withheld.

6.8    Governing Law. This Plan is established under and will be construed according to the laws of the State of Tennessee without regard to any conflict of law principles, except to the extent such laws may be preempted by ERISA.

6.9    Compliance with Code Section 409A. The terms of the Plan shall be interpreted and applied in a manner consistent with the requirements of Section 409A of the Code and the final regulations thereunder. The Employers shall have no obligation to reimburse a Participant for any tax penalty or interest payable under Section 409A of the Code.

NOW, THEREFORE, Unum Group has caused this document to be executed by its duly authorized officer on this 27th day of September, 2013.

UNUM GROUP

By:     /s/ Diane M. Garofalo            

Its    SVP, Corporate Human Resources

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EX-12

EXHIBIT 12

STATEMENT REGARDING COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31
	2013		2012		2011		2010		2009
	(in millions of dollars, except ratios)
Earnings
Income Before Income Tax	$	1,205.2	$	1,249.5	$	333.3	$	1,319.9	$	1,283.9
Fixed Charges	175.1		169.8		165.5		163.1		146.2
Adjusted Earnings	$	1,380.3	$	1,419.3	$	498.8	$	1,483.0	$	1,430.1
Fixed Charges
Interest and Debt Expense	$	149.4	$	145.4	$	143.3	$	143.3	$	126.2
Interest Credited on Investment Products	10.2		9.7		9.4		8.9		8.4
Portion of Rents Deemed Representative of Interest	14.7		13.9		12.0		9.8		10.0
Other	0.8		0.8		0.8		1.1		1.6
Total Fixed Charges	$	175.1	$	169.8	$	165.5	$	163.1	$	146.2
Ratio of Earnings to Fixed Charges	7.9		8.4		3.0		9.1		9.8

EX-21

EXHIBIT 21

SUBSIDIARIES OF THE REGISTRANT

	Company Name	State or Jurisdiction of Incorporation
Unum Group		Delaware
	First Unum Life Insurance Company	New York
	Unum Life Insurance Company of America	Maine
	Duncanson & Holt, Inc.	New York
	Duncanson & Holt Services, Inc.	Maine
	Duncanson & Holt Canada Ltd.	Canada
	Duncanson & Holt Underwriters Ltd.	England and Wales
	Duncanson & Holt Europe Ltd.	England and Wales
*	Duncanson & Holt Syndicate Management Ltd.	England and Wales
	Unum European Holding Company Limited	England and Wales
	Unum Limited	England and Wales
	Claims Services International Limited	England and Wales
	Unum Select Limited	England and Wales
	UnumProvident Finance Company plc	England and Wales
	Unum Ireland Limited	Ireland
	Colonial Life & Accident Insurance Company	South Carolina
	UnumProvident International Ltd.	Vermont
	Tailwind Holdings, LLC	Delaware
	Tailwind Reinsurance Company	South Carolina
	Northwind Holdings, LLC	Delaware
	Northwind Reinsurance Company	Vermont
	The Paul Revere Life Insurance Company	Massachusetts
	The Paul Revere Variable Annuity Insurance Company	Massachusetts
	Provident Life and Accident Insurance Company	Tennessee
	Provident Life and Casualty Insurance Company	Tennessee
	Provident Investment Management, LLC	Tennessee

* Liquidation in process.

EX-23

EXHIBIT 23

CONSENT OF ERNST & YOUNG LLP,

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Unum Group

We consent to the incorporation by reference in the following Registration Statements:

1. Registration Statement (Form S-8 No. 333-81669) pertaining to:

a. Provident Companies, Inc. Stock Plan of 1999

b. Provident Companies, Inc. Non-Employee Director Compensation Plan of 1998

c. Employee Stock Option Plan of 1998

d. Amended and Restated Annual Management Incentive Compensation Plan of 1994,

2. Registration Statement (Form S-8 No. 333-85882) pertaining to:

a. UnumProvident Corporation Stock Plan of 1999

b. UnumProvident Corporation 401(k) Retirement Plan (as amended on February 15, 2002)

c. UnumProvident Corporation Broad-Based Stock Plan of 2001 (as amended on February 8, 2001)

d. UnumProvident Corporation Broad-Based Stock Plan of 2002

e. UnumProvident Corporation Employee Stock Option Plan,

3. Registration Statement (Form S-8 No. 333-123422) of Unum Group (formerly UnumProvident Corporation) pertaining to:

a. UnumProvident Corporation Amended and Restated Employee Stock Purchase Plan

b. UnumProvident Corporation Amended and Restated Non-Employee Director Compensation Plan of 2004,

4. Registration Statement (Form S-8 No. 333-145400) of Unum Group pertaining to the Unum Group Stock Incentive Plan of 2007,

5. Registration Statement (Form S-8 No. 333-158885) of Unum Group pertaining to the Unum Limited Savings-Related Share Option Scheme of 2008,

6. Registration Statement (Form S-3 ASR No. 333-177892),

7. Registration Statement (Form S-8 No. 333-183732) of Unum Group pertaining to the Unum European Holding Company Limited Savings-Related Share Option Scheme 2011, and

8. Registration Statement (Form S-8 No. 333-183733) of Unum Group pertaining to the Unum Group Stock Incentive Plan of 2012,

of our reports dated February 26, 2014, with respect to the consolidated financial statements and schedules of Unum Group and subsidiaries and the effectiveness of internal control over financial reporting of Unum Group and subsidiaries, included in this Annual Report on Form 10-K for the year ended December 31, 2013.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

February 26, 2014

EX-24

EXHIBIT 24

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each of the undersigned, being a director of Unum Group, a Delaware corporation (the “Company”), hereby constitutes and appoints Liston Bishop III and Susan N. Roth, and each of them, as his or her true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead in any and all capacities, to sign one or more Annual Reports for the Company's fiscal year ended December 31, 2013 on Form 10-K under the Securities Act of 1934, as amended, or such other form as any such attorney-in-fact may deem necessary or desirable, and any and all amendments thereto, each in such form as they or any of them may approve, and to file the same with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done so that such Annual Report shall comply with the Securities Exchange Act of 1934, as amended, and the applicable rules and regulations adopted or issued pursuant thereto, as fully and to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them or their substitute or resubstitute, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned have each executed this Power of Attorney as of February 26, 2014.

/s/ Theodore H. Bunting, Jr.	/s/ Thomas Kinser
Theodore H. Bunting, Jr.	Thomas Kinser
/s/ E. Michael Caulfield	/s/ Gloria C. Larson
E. Michael Caulfield	Gloria C. Larson
/s/ Pamela H. Godwin	/s/ A.S. MacMillan, Jr.
Pamela H. Godwin	A.S. MacMillan, Jr.
/s/ Ronald E. Goldsberry	/s/ Edward J. Muhl
Ronald E. Goldsberry	Edward J. Muhl
/s/ Kevin T. Kabat	/s/ Michael J. Passarella
Kevin T. Kabat	Michael J. Passarella
/s/ Timothy F. Keaney	/s/ William J. Ryan
Timothy F. Keaney	William J. Ryan

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Thomas R. Watjen, certify that:

1. I have reviewed this annual report on Form 10-K of Unum Group;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 26, 2014	/s/ Thomas R. Watjen
	Thomas R. Watjen
	President and Chief Executive Officer

A signed original of this written statement required by Section 302 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Richard P. McKenney, certify that:

1. I have reviewed this annual report on Form 10-K of Unum Group;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 26, 2014	/s/ Richard P. McKenney
	Richard P. McKenney
	Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 302 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.1

EXHIBIT 32.1

STATEMENT OF CHIEF EXECUTIVE OFFICER

OF UNUM GROUP

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Unum Group (the Company) on Form 10-K for the period ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Thomas R. Watjen, President and Chief Executive Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 26, 2014	/s/ Thomas R. Watjen
	Thomas R. Watjen
	President and Chief Executive Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

EXHIBIT 32.2

STATEMENT OF CHIEF FINANCIAL OFFICER

OF UNUM GROUP

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Unum Group (the Company) on Form 10-K for the period ended December 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Richard P. McKenney, Executive Vice President and Chief Financial Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 26, 2014	/s/ Richard P. McKenney
	Richard P. McKenney
	Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Senior Secured Notes, variable due 2037, callable at or above par	$	440.0		$	500.0
Senior Secured Notes, variable due 2036, callable at or above par	—			62.5
Notes @ 5.75% due 2042, callable at or above par	248.6			248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 6.85% due 2015, callable at or above par	296.8			296.7
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	2,612.0			2,755.4
Short-term Debt
Securities Lending Agreements - See Note 3	76.5			455.8
Total	$	2,688.5		$	3,211.2

XML

Stock option activity (Detail) (Stock Options, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding at Beginning of Period	1,691
Shares Granted	103
Shares Exercised	(399)
Shares Outstanding at End of Period	1,395
Shares Exercisable	1,041
Weighted Average Exercise Price of Shares Outstanding at Beginning of Period	$ 20.98
Weighted Average Exercise Price of Shares Granted	$ 24.25
Weighted Average Exercise Price of Shares Exercised	$ 21.15
Weighted Average Exercise Price of Shares Outstanding at End of Period	$ 21.17
Weighted Average Exercise Price of Exercisable Shares	$ 20.15
Weighted Average Remaining Contractual Term of Outstanding Options	4 years 59 days
Weighted Average Remaining Contractual Term of Exercisable Option	3 years 166 days
Options Outstanding, Intrinsic Value	$ 19.4
Options, Exercisable, Intrinsic Value	$ 15.5

XML

Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fixed Maturity Securities
Fixed Maturity Securities	$ 42,344.4	$ 44,973.0
Other Long-term Investments
Equity Securities	16.4	14.6
Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	2,523.3	2,218.4
Other Long-term Investments
Equity Securities	0	0
Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	37,480.6	40,766.3
Other Long-term Investments
Equity Securities	11.8	10.3
Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	2,340.5	1,988.3
Other Long-term Investments
Equity Securities	4.6	4.3
Interest Rate Swaps
Other Long-term Investments
Derivative Assets	9.2	76.5
Other Liabilities
Derivative Liabilities	35.0	31.7
Interest Rate Swaps | Fair Value, Inputs, Level 1
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Interest Rate Swaps | Fair Value, Inputs, Level 2
Other Long-term Investments
Derivative Assets	9.2	76.5
Other Liabilities
Derivative Liabilities	35.0	31.7
Interest Rate Swaps | Fair Value, Inputs, Level 3
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	1.6	5.1
Other Liabilities
Derivative Liabilities	98.7	138.8
Foreign Exchange Contracts | Fair Value, Inputs, Level 1
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Foreign Exchange Contracts | Fair Value, Inputs, Level 2
Other Long-term Investments
Derivative Assets	1.6	5.1
Other Liabilities
Derivative Liabilities	98.7	138.8
Foreign Exchange Contracts | Fair Value, Inputs, Level 3
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Derivative Assets
Other Long-term Investments
Derivative Assets	10.8	81.6
Derivative Assets | Fair Value, Inputs, Level 1
Other Long-term Investments
Derivative Assets	0	0
Derivative Assets | Fair Value, Inputs, Level 2
Other Long-term Investments
Derivative Assets	10.8	81.6
Derivative Assets | Fair Value, Inputs, Level 3
Other Long-term Investments
Derivative Assets	0	0
Credit Default Swaps
Other Liabilities
Derivative Liabilities	1.9
Credit Default Swaps | Fair Value, Inputs, Level 1
Other Liabilities
Derivative Liabilities	0
Credit Default Swaps | Fair Value, Inputs, Level 2
Other Liabilities
Derivative Liabilities	1.9
Credit Default Swaps | Fair Value, Inputs, Level 3
Other Liabilities
Derivative Liabilities	0
Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	53.2	83.9
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 1
Other Liabilities
Derivative Liabilities	0	0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 2
Other Liabilities
Derivative Liabilities	0	0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 3
Other Liabilities
Derivative Liabilities	53.2	83.9
Derivative Liabilities
Other Liabilities
Derivative Liabilities	188.8	254.4
Derivative Liabilities | Fair Value, Inputs, Level 1
Other Liabilities
Derivative Liabilities	0	0
Derivative Liabilities | Fair Value, Inputs, Level 2
Other Liabilities
Derivative Liabilities	135.6	170.5
Derivative Liabilities | Fair Value, Inputs, Level 3
Other Liabilities
Derivative Liabilities	53.2	83.9
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,196.1	1,348.8
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	144.5	104.1
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	1,051.6	1,244.7
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	0	0
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,783.2	1,806.8
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	0	53.0
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	1,608.1	1,625.1
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	175.1	128.7
Foreign Government Debt Securities
Fixed Maturity Securities
Fixed Maturity Securities	1,373.2	1,507.0
Foreign Government Debt Securities | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Foreign Government Debt Securities | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	1,294.7	1,424.9
Foreign Government Debt Securities | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	78.5	82.1
Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	10,403.0	11,144.2
Public Utilities | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	396.8	84.2
Public Utilities | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	9,802.7	10,485.6
Public Utilities | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	203.5	574.4
Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,039.3	2,216.5
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	2,038.8	2,216.0
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	0.5	0.5
All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	25,511.9	26,910.4
All Other Corporate Bonds | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	1,982.0	1,977.1
All Other Corporate Bonds | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	21,670.8	23,755.5
All Other Corporate Bonds | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	1,859.1	1,177.8
Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	37.7	39.3
Redeemable Preferred Stocks | Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Redeemable Preferred Stocks | Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	13.9	14.5
Redeemable Preferred Stocks | Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	$ 23.8	$ 24.8

XML

Condensed Financial Information of Registrant (Tables)

12 Months Ended

Dec. 31, 2013

Schedule II - Condensed Financial Information of Registrant Balance Sheet [Abstract]

Condensed Financial Information of Parent Company Only Balance Sheets

BALANCE SHEETS

	December 31
	2013			2012
	(in millions of dollars)
Assets
Fixed Maturity Securities - at fair value (amortized cost: $143.9; $217.7)	$	145.3		$	224.6
Other Long-term Investments	57.2			73.0
Short-term Investments	164.0			433.5
Investment in Subsidiaries	10,082.8			10,079.1
Deferred Income Tax	68.1			234.1
Other Assets	558.8			489.1
Total Assets	$	11,076.2		$	11,533.4
Liabilities and Stockholders' Equity
Liabilities
Short-term Debt	$	0.3		$	6.6
Long-term Debt	1,875.2			1,896.2
Pension and Postretirement Benefits	295.3			801.6
Other Liabilities	246.3			216.4
Total Liabilities	2,417.1			2,920.8
Stockholders' Equity
Common Stock	36.1			36.0
Additional Paid-in Capital	2,634.1			2,607.7
Accumulated Other Comprehensive Income	255.0			628.0
Retained Earnings	8,083.2			7,371.6
Treasury Stock	(2,349.3		)	(2,030.7		)
Total Stockholders' Equity	8,659.1			8,612.6
Total Liabilities and Stockholders' Equity	$	11,076.2		$	11,533.4

See notes to condensed financial information.

Condensed Financial Information of Parent Company Only Statement of Earnings

STATEMENTS OF INCOME

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Dividends from Subsidiaries	$	636.6		$	670.8		$	800.0
Other Income	56.9			55.0			65.0
Total Revenue	693.5			725.8			865.0
Interest and Debt Expense	120.9			114.2			112.1
Other Expenses	48.9			65.5			57.7
Total Expenses	169.8			179.7			169.8
Income Before Income Tax of Parent Company	523.7			546.1			695.2
Income Tax Benefit	(14.7		)	(25.7		)	(13.9		)
Income of Parent Company	538.4			571.8			709.1
Equity in Undistributed Earnings (Loss) of Subsidiaries	319.7			322.6			(424.9		)
Net Income	858.1			894.4			284.2
Other Comprehensive Income (Loss), Net of Tax	(373.0		)	166.2			110.4
Comprehensive Income	$	485.1		$	1,060.6		$	394.6

See notes to condensed financial information.

Condensed Financial Information of Parent Company Only Statements of Cash Flows

STATEMENTS OF CASH FLOWS

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Provided by Operating Activities	$	612.5		$	677.3		$	827.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	—			—			133.9
Proceeds from Maturities of Fixed Maturity Securities	38.5			47.7			44.5
Proceeds from Sales and Maturities of Other Investments	9.4			1.0			—
Purchase of Fixed Maturity Securities	(139.8		)	(99.1		)	—
Purchase of Other Investments	—			(13.7		)	(3.0		)
Net Sales of Short-term Investments	269.5			40.4			192.8
Cash Distributions to Subsidiaries	(225.1		)	(175.2		)	(166.1		)
Acquisition of Property and Equipment	(78.8		)	(80.4		)	(81.1		)
Other, Net	(0.9		)	0.1			0.2
Cash Provided (Used) by Investing Activities	(127.2		)	(279.2		)	121.2
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(6.3		)	4.1			(222.6		)
Issuance of Long-term Debt	—			246.4			—
Issuance of Common Stock	11.4			4.9			14.8
Repurchase of Common Stock	(317.2		)	(496.7		)	(619.9		)
Dividends Paid to Stockholders	(146.5		)	(133.8		)	(121.0		)
Other, Net	(0.3		)	1.6			—
Cash Used by Financing Activities	(458.9		)	(373.5		)	(948.7		)
Increase in Cash	$	26.4		$	24.6		$	0.3

See notes to condensed financial information.

Schedule of Debt Instruments Parent Company Only

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Notes @ 5.75% due 2042, callable at or above par	$	248.6		$	248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	1,875.2			1,896.2
Short-term Debt
Securities Lending Agreements	0.3			6.6
Total	$	1,875.5		$	1,902.8

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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
Operating Leases, Future Minimum Payments Due	$ 213.9
Operating Leases, Future Minimum Payments Due, Next Twelve Months	40.7
Operating Leases, Future Minimum Payments, Due in Two Years	27.9
Operating Leases, Future Minimum Payments, Due in Three Years	22.4
Operating Leases, Future Minimum Payments, Due in Four Years	17.7
Operating Leases, Future Minimum Payments, Due in Five Years	16.6
Operating Leases, Future Minimum Payments, Due Thereafter	88.6
Operating Leases, Rent Expense, Minimum Rentals	44.1	41.6	36.1
Commitment to fund partnership Equity Investments	158.4
Commitment to fund private placement fixed maturity securities	58.0
Committments to Fund Commercial Mortgage Loans	83.9
Interest on undrawn retained asset account funds			18.00%
Loss Contingency, Damages Awarded, Value	12.1
Loss Contingency, Prejudgment Interest Awarded	$ 1.3

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Investments Investment Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									$ 2,552.1	$ 2,574.3	$ 2,578.3
Less Investment Expenses									29.5	26.9	26.9
Less Investment Income on PFA Assets									15.7	16.1	17.4
Less Amortization of Tax Credit Partnerships									14.8	16.1	14.4
Net Investment Income	629.4	615.5	626.1	621.1	643.0	619.2	633.5	619.5	2,492.1	2,515.2	2,519.6
Fixed Income Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									2,371.6	2,404.0	2,425.2
Derivative [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									35.2	28.9	22.9
Mortgage Receivable [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									109.2	107.1	100.1
Policy Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									15.7	14.8	14.1
Other Long-term Investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									18.0	15.2	13.1
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend									$ 2.4	$ 4.3	$ 2.9

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Statutory Financial Information - Additional Details (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 UnumProvidentInternationalLimited [Domain] USD ($)	Dec. 31, 2013 UnumLimited [Domain] GBP (£)	Dec. 31, 2013 United States Traditional Insurance Subsidiaries [Member] USD ($)	Dec. 31, 2012 United States Traditional Insurance Subsidiaries [Member] USD ($)	Dec. 31, 2011 United States Traditional Insurance Subsidiaries [Member] USD ($)
Statutory Accounting Practices [Line Items]
CapitalandSurplusIncreaseFromRedomestication	$ 176
Statutory Net Income		94.6	584.5	624.5	642.9
Statutory Combined Capital and Surplus		438.1	3,450.5	3,426.5
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments		187.8	591.0
Cash and Securities Segregated under Federal and Other Regulations			$ 280.5	$ 277.5

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Transfers of Assets between Level 1 and Level 2 (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Transfers Between Level 1 and Level 2 [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 1,607.1	$ 1,115.7
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	1,191.7	3,730.5
United States Government and Government Agencies and Authorities
Transfers Between Level 1 and Level 2 [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	62.2	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0	224.7
States, Municipalities, and Political Subdivisions
Transfers Between Level 1 and Level 2 [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	53.0	43.8
Public Utility, Bonds [Member]
Transfers Between Level 1 and Level 2 [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	345.9	47.1
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	53.4	653.1
All Other Corporate Bonds
Transfers Between Level 1 and Level 2 [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	1,199.0	1,068.6
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 1,085.3	$ 2,808.9

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Liability for Unpaid Claims Recon (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Balance at January 1	$ 24,567.1	$ 24,586.5	$ 24,339.4
Less Reinsurance Recoverable	2,006.0	2,042.6	2,028.2
Net Balance at January 1	22,561.1	22,543.9	22,311.2
Incurred Related to
Current Year	4,751.9	4,946.2	4,684.4
Total Incurred	5,978.4	6,119.2	6,145.5
Paid Related to
Current Year	1,657.3	1,715.4	1,588.6
Prior Years	4,419.4	4,386.6	4,324.2
Total Paid	6,076.7	6,102.0	5,912.8
Net Balance at December 31	22,462.8	22,561.1	22,543.9
Plus Reinsurance Recoverable	2,072.8	2,006.0	2,042.6
Balance at December 31	24,535.6	24,567.1	24,586.5
Interest and Debt Expense
Incurred Related to
Prior Years	1,230.0	1,247.6	1,262.9
Other Expense
Incurred Related to
Prior Years	(44.7)	(175.7)	209.1
Foreign Currency Gain (Loss) [Member]
Incurred Related to
Prior Years	$ 41.2	$ 101.1	$ (10.9)

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Net Income Per Common Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator
Net Income	$ 221.2	$ 205.7	$ 218.6	$ 212.6	$ 233.9	$ 230.2	$ 216.4	$ 213.9	$ 858.1	$ 894.4	$ 284.2
Denominator (000s)
Weighted Average Common Shares - Basic									264,725,800	281,355,900	302,399,800
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards									1,223,400	400,900	1,171,200
Weighted Average Common Shares - Assuming Dilution									265,949,200	281,756,800	303,571,000
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.85	$ 0.78	$ 0.82	$ 0.79	$ 0.86	$ 0.83	$ 0.76	$ 0.74	$ 3.24	$ 3.18	$ 0.94
Earnings Per Share, Diluted	$ 0.84	$ 0.78	$ 0.82	$ 0.79	$ 0.85	$ 0.83	$ 0.76	$ 0.73	$ 3.23	$ 3.17	$ 0.94
Retained Earnings
Numerator
Net Income									$ 858.1	$ 894.4	$ 284.2

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Unaudited Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following is a summary of our unaudited quarterly results of operations for 2013 and 2012:

	2013
	4th		3rd			2nd		1st
	(in millions of dollars, except share data)
Premium Income	$	1,890.7	$	1,897.3		$	1,905.8	$	1,930.9
Net Investment Income	629.4		615.5			626.1		621.1
Net Realized Investment Gain (Loss)	9.3		(26.1		)	13.3		10.3
Total Revenue	2,586.2		2,540.9			2,601.9		2,624.8
Income Before Income Tax	305.8		284.1			311.5		303.8
Net Income	221.2		205.7			218.6		212.6
Net Income Per Common Share
Basic	0.85		0.78			0.82		0.79
Assuming Dilution	0.84		0.78			0.82		0.79

	2012
	4th		3rd		2nd			1st
	(in millions of dollars, except share data)
Premium Income	$	1,937.2	$	1,929.4	$	1,927.6		$	1,921.9
Net Investment Income	643.0		619.2		633.5			619.5
Net Realized Investment Gain (Loss)	24.6		21.3		(2.1		)	12.4
Total Revenue	2,658.2		2,628.0		2,617.9			2,611.3
Income Before Income Tax	322.7		320.4		296.4			310.0
Net Income	233.9		230.2		216.4			213.9
Net Income Per Common Share
Basic	0.86		0.83		0.76			0.74
Assuming Dilution	0.85		0.83		0.76			0.73

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Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Carrying Amount and Fair Value of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the following chart.

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,344.4	$	42,344.4	$	44,973.0	$	44,973.0
Mortgage Loans	1,815.1		1,980.2		1,712.7		1,937.1
Policy Loans	3,276.0		3,339.6		3,133.8		3,215.3
Other Long-term Investments
Derivatives	10.8		10.8		81.6		81.6
Equity Securities	16.4		16.4		14.6		14.6
Miscellaneous Long-term Investments	475.2		475.2		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	631.5	$	631.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	563.1		563.1		535.5		535.5
Long-term Debt	2,612.0		2,824.4		2,755.4		2,968.8
Other Liabilities
Derivatives	135.6		135.6		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	53.2		53.2		83.9		83.9
Unfunded Commitments to Investment Partnerships	27.2		27.2		83.7		83.7

Fair Value Measurements by Input Level

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	144.5	$	1,051.6	$	—	$	1,196.1
States, Municipalities, and Political Subdivisions	—		1,608.1		175.1		1,783.2
Foreign Governments	—		1,294.7		78.5		1,373.2
Public Utilities	396.8		9,802.7		203.5		10,403.0
Mortgage/Asset-Backed Securities	—		2,038.8		0.5		2,039.3
All Other Corporate Bonds	1,982.0		21,670.8		1,859.1		25,511.9
Redeemable Preferred Stocks	—		13.9		23.8		37.7
Total Fixed Maturity Securities	2,523.3		37,480.6		2,340.5		42,344.4
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		9.2		—		9.2
Foreign Exchange Contracts	—		1.6		—		1.6
Total Derivatives	—		10.8		—		10.8
Equity Securities	—		11.8		4.6		16.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	35.0	$	—	$	35.0
Foreign Exchange Contracts	—		98.7		—		98.7
Credit Default Swaps	—		1.9		—		1.9
Embedded Derivative in Modified Coinsurance Arrangement	—		—		53.2		53.2
Total Derivatives	—		135.6		53.2		188.8

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

Transfers of Assets between Level 1 and Level 2

Transfers of assets between Level 1 and Level 2 are as follows:

	Year Ended December 31
	2013				2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	62.2	$	—	$	—	$	224.7
States, Municipalities, and Political Subdivisions	—		53.0		—		43.8
Public Utilities	345.9		53.4		47.1		653.1
All Other Corporate Bonds	1,199.0		1,085.3		1,068.6		2,808.9
Total Fixed Maturity Securities	$	1,607.1	$	1,191.7	$	1,115.7	$	3,730.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Year Ended December 31, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(13.1	)	$	—	$	(1.0	)	$	60.5	$	—		$	175.1
Foreign Governments	82.1			—			(3.6		)	—		—			—		—			78.5
Public Utilities	574.4			—			(10.8		)	—		(3.1		)	151.8		(508.8		)	203.5
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(147.1		)	186.7		(122.0		)	1,462.0		(699.4		)	1,859.1
Redeemable Preferred Stocks	24.8			—			(1.0		)	—		—			—		—			23.8
Total Fixed Maturity Securities	1,988.3			1.1			(175.5		)	186.7		(126.2		)	1,674.3		(1,208.2		)	2,340.5
Equity Securities	4.3			—			0.3			—		—			—		—			4.6
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	30.7			—			—		—			—		—			(53.2		)
	Year Ended December 31, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.3	)	$	18.4	$	(0.7	)	$	43.2	$	—		$	128.7
Foreign Governments	—			—			5.0			15.4		—			61.7		—			82.1
Public Utilities	338.9			—			22.3			47.9		(4.2		)	481.4		(311.9		)	574.4
Mortgage/Asset-Backed Securities	31.7			—			—			—		(0.1		)	—		(31.1		)	0.5
All Other Corporate Bonds	665.5			1.2			40.8			151.6		(67.5		)	599.8		(213.6		)	1,177.8
Redeemable Preferred Stocks	37.2			(1.0		)	2.9			—		(14.3		)	—		—			24.8
Total Fixed Maturity Securities	1,141.4			0.2			70.7			233.3		(86.8		)	1,186.1		(556.6		)	1,988.3
Equity Securities	11.2			(0.1		)	—			—		(0.1		)	—		(6.7		)	4.3
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	51.8			—			—		—			—		—			(83.9		)

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation. Gains for the years ended December 31, 2013 and 2012 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at each year end were $30.7 million and $51.8 million, respectively. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Quantitative Information Regarding Significant Unobservable Inputs

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	December 31, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	142.7		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.65%
Public Utilities	64.3			- Volatility of Credit	(e)	0.75% - 1.25% / 0.92%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	4.93% - 5.03% / 5.01%
All Other Corporate Bonds - Private	307.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	3.36% - 3.36% / 3.36% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.07% - 4.00% / 0.84% Priced at Par
All Other Corporate Bonds - Public	514.4			- Change in Benchmark Reference - Comparability Adjustment - Lack of Marketability - Volatility of Credit	(a) (b) (d) (e)	(0.32)% - 0.25% / 0.04% (0.23)% - 1.00% / 0.41% 0.20% - 0.20% / 0.20% (0.88)% - 0.46% / (0.26)%
Equity Securities - Private	4.2			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(53.2		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

(e) Represents basis point adjustments for credit-specific factors

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

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Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income
Balance, Beginning of Period	$ 628.0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(382.6)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	9.6
Total Other Comprehensive Income (Loss)	(373.0)	166.2	110.4
Balance, End of Period	255.0	628.0
Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income
Balance, Beginning of Period	873.5
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(746.4)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	8.6
Total Other Comprehensive Income (Loss)	(737.8)
Balance, End of Period	135.7
Net Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance, Beginning of Period	401.6
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	9.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	(15.0)
Total Other Comprehensive Income (Loss)	(5.3)
Balance, End of Period	396.3
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(72.6)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	25.5
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	0
Total Other Comprehensive Income (Loss)	25.5
Balance, End of Period	(47.1)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(574.5)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	328.6
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	16.0
Total Other Comprehensive Income (Loss)	344.6
Balance, End of Period	$ (229.9)

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Segment Information Deferred Acquisition Costs by Segment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Acquisition Costs at Beginning of Period	$ 1,755.5	$ 1,677.1	$ 1,816.1
Deferral of Acquisition Costs	466.8	467.3	442.5
Deferred Policy Acquisition Cost, Amortization Expense	(418.9)	(378.7)	(365.7)
Impairment of Deferred Acquisition Costs	0	0	(196.0)
Adjustment Related to Unrealized Investment Gain (Loss)	25.4	(12.0)	(19.6)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other	(0.4)	(1.8)	(0.2)
Deferred Acquisition Costs at End of Period	1,829.2	1,755.5	1,677.1
Unum U.S.
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Acquisition Costs at Beginning of Period	1,024.3	971.8	943.7
Deferral of Acquisition Costs	252.0	249.2	220.3
Deferred Policy Acquisition Cost, Amortization Expense	(230.0)	(196.5)	(188.1)
Impairment of Deferred Acquisition Costs			0
Adjustment Related to Unrealized Investment Gain (Loss)	5.2	(0.2)	(4.1)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other	0	0	0
Deferred Acquisition Costs at End of Period	1,051.5	1,024.3	971.8
Unum U.K.
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Acquisition Costs at Beginning of Period	38.8	40.9	41.0
Deferral of Acquisition Costs	9.8	11.8	15.4
Deferred Policy Acquisition Cost, Amortization Expense	(14.7)	(15.7)	(15.3)
Impairment of Deferred Acquisition Costs			0
Adjustment Related to Unrealized Investment Gain (Loss)	0	0	0
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other	(0.4)	(1.8)	(0.2)
Deferred Acquisition Costs at End of Period	34.3	38.8	40.9
Colonial Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Acquisition Costs at Beginning of Period	692.4	664.4	628.0
Deferral of Acquisition Costs	205.0	206.3	203.1
Deferred Policy Acquisition Cost, Amortization Expense	(174.2)	(166.5)	(151.2)
Impairment of Deferred Acquisition Costs			0
Adjustment Related to Unrealized Investment Gain (Loss)	20.2	(11.8)	(15.5)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other	0	0	0
Deferred Acquisition Costs at End of Period	743.4	692.4	664.4
Closed Block
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Acquisition Costs at Beginning of Period	0	0	203.4
Deferral of Acquisition Costs	0	0	3.7
Deferred Policy Acquisition Cost, Amortization Expense	0	0	(11.1)
Impairment of Deferred Acquisition Costs			(196.0)
Adjustment Related to Unrealized Investment Gain (Loss)	0	0	0
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other	0	0	0
Deferred Acquisition Costs at End of Period	$ 0	$ 0	$ 0

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Schedule I Summary of Investments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 38,289.6	[1]	$ 37,751.5
Fixed Maturity Securities	42,344.4		44,973.0
Mortgage Loans	1,815.1	[1]	1,712.7
Policy Loans	3,276.0	[1]	3,133.8
Short-term Investments	913.4	[1]
Investment Owned, at Cost	44,836.1	[1]
Investments	48,914.9		51,904.8
Other Long-term Investments
Available-for-sale Equity Securities, Amortized Cost Basis	11.3	[1]
Equity Securities	16.4		14.6
Other Investments and Securities, at Cost	530.7	[1]
United States Government and Government Agencies and Authorities
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,028.6	[1]	1,020.9
Fixed Maturity Securities	1,196.1		1,348.8
States, Municipalities, and Political Subdivisions
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,706.0	[1]	1,498.4
Fixed Maturity Securities	1,783.2		1,806.8
Foreign Government Debt Securities
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,226.4	[1]	1,280.4
Fixed Maturity Securities	1,373.2		1,507.0
Public Utility, Bonds [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,328.9	[1]	9,294.3
Fixed Maturity Securities	10,403.0		11,144.2
Mortgage/Asset-backed Securities
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,858.7	[1]	1,927.9
Fixed Maturity Securities	2,039.3		2,216.5
All Other Corporate Bonds
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	23,108.0	[1]	22,696.6
Fixed Maturity Securities	25,511.9		26,910.4
Redeemable Preferred Stocks
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	33.0	[1]	33.0
Fixed Maturity Securities	37.7		39.3
Measurement at Cost [Member]
Other Long-term Investments
Derivative Assets	0	[1]
Carrying Amount
Schedule of Investments [Line Items]
Fixed Maturity Securities	42,344.4
Mortgage Loans	1,815.1		1,712.7
Policy Loans	3,276.0		3,133.8
Short-term Investments	913.4
Other Long-term Investments
Derivative Assets	10.8	[2]	81.6
Equity Securities	16.4		14.6
Other Long-term Investments	538.8	[3]
Carrying Amount | United States Government and Government Agencies and Authorities
Schedule of Investments [Line Items]
Fixed Maturity Securities	1,196.1
Carrying Amount | States, Municipalities, and Political Subdivisions
Schedule of Investments [Line Items]
Fixed Maturity Securities	1,783.2
Carrying Amount | Foreign Government Debt Securities
Schedule of Investments [Line Items]
Fixed Maturity Securities	1,373.2
Carrying Amount | Public Utility, Bonds [Member]
Schedule of Investments [Line Items]
Fixed Maturity Securities	10,403.0
Carrying Amount | Mortgage/Asset-backed Securities
Schedule of Investments [Line Items]
Fixed Maturity Securities	2,039.3
Carrying Amount | All Other Corporate Bonds
Schedule of Investments [Line Items]
Fixed Maturity Securities	25,511.9
Carrying Amount | Redeemable Preferred Stocks
Schedule of Investments [Line Items]
Fixed Maturity Securities	$ 37.7

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

[2] (2)Derivatives are carried at fair value.

[3] (3)The difference between amortized cost and carrying value primarily results from changes in the partnership owner's equity since acquisition.

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Parent Company Notes - Additional Details (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended				12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Dec. 31, 2013 Notes 5 Point 750 Due 2042 Callable At or Above Par [Member]	Dec. 31, 2012 Notes 5 Point 750 Due 2042 Callable At or Above Par [Member]	Dec. 31, 2013 Junior Subordinated Debt Securities 7 Point 405 Percent due 2038 [Member]	Dec. 31, 1998 Junior Subordinated Debt Securities 7 Point 405 Percent due 2038 [Member]	Dec. 31, 2013 Notes 6 Point 85 Percent due 2015 callable at or above par [Member]	Dec. 31, 2013 Notes 6 Point 85 Percent due 2015 callable at or above par [Member] Subsidiaries [Member]	Dec. 31, 2011 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member]	Dec. 31, 2011 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member] Medium-term Notes 7 Point 0 Percent to 7 Point 2 Percent due 2023 to 2028 noncallable [Member]	Dec. 31, 2013 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member] Medium-term Notes 7 Point 0 Percent to 7 Point 2 Percent due 2023 to 2028 noncallable [Member]	Dec. 31, 2013 Receive Fixed/Pay Variable Interest Rate Swaps	Dec. 31, 2012 Receive Fixed/Pay Variable Interest Rate Swaps
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 350.0				$ 350.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	200.0				200.0
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,772.6				1,332.6
Proceeds from Unsecured Notes Payable								250.0	250.0
Derivative, Notional Amount	1,477.4	1,432.8	1,413.0	1,681.9													600.0	600.0
Junior Subordinated Notes										300.0	300.0
Debt Instrument, Interest Rate, Stated Percentage										7.405%	7.405%	6.85%		7.625%		7.625%
Liquidation value per capital security										$ 1,000	$ 1,000
Repayments of Medium-term Notes														225.1	225.1
Interest Paid	144.6	139.6	145.4		116.5	109.0	115.6
Line of Credit Facility Original Expiration Period	5 years
Line of Credit Facility, Maximum Borrowing Capacity	400.0
Line Of Credit Facility Maximum Borrowing Capacity If Requested	600.0
Line of Credit Facility, Amount Outstanding	0
Guarantor Obligations, Liquidation Proceeds, Monetary Amount												400.0
Long-term Debt and Capital Lease Obligations	$ 2,612.0	$ 2,755.4			$ 1,875.2	$ 1,896.2							$ 296.9

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Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Balance at beginning of period	$ 1,432.8	$ 1,413.0	$ 1,681.9
Additions	291.0	336.0	46.9
Terminations	246.4	316.2	315.8
Balance at ending of period	1,477.4	1,432.8	1,413.0
Credit Default Swaps
Derivative [Line Items]
Balance at ending of period	97.0	0
Swaps | Receive Variable/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	174.0	174.0	174.0
Additions	0	0	0
Terminations	24.0	0	0
Balance at ending of period	150.0	174.0	174.0
Swaps | Receive Fixed/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	508.8	554.0	617.9
Additions	160.0	0	0
Terminations	38.4	45.2	63.9
Balance at ending of period	630.4	508.8	554.0
Swaps | Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at beginning of period	750.0	685.0	890.0
Additions	0	250.0	0
Terminations	150.0	185.0	205.0
Balance at ending of period	600.0	750.0	685.0
Swaps | Credit Default Swaps
Derivative [Line Items]
Balance at beginning of period	0	0	0
Additions	97.0	0	0
Terminations	0	0	0
Balance at ending of period	97.0	0	0
Forwards
Derivative [Line Items]
Balance at beginning of period	0	0	0
Additions	24.0	86.0	46.9
Terminations	24.0	86.0	46.9
Balance at ending of period	0	0	0
Options Held
Derivative [Line Items]
Balance at beginning of period	0	0	0
Additions	10.0	0	0
Terminations	10.0	0	0
Balance at ending of period	$ 0	$ 0	$ 0

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Income Tax Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Income Tax Reconciliation, Change in Enacted Tax Rate		$ 6,300,000	$ 9,300,000	$ 6,800,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		3.00%	2.00%
Excess of Financial Reporting Carrying Amount Over the Tax Basis of Investments in Foreign Subsidiaries, Provision Not Practicable		999,600,000.0
Liability for unrecognized tax benefits		10,200,000	15,000,000	86,900,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense		1,100,000	10,400,000	13,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		800,000	1,900,000
Tax Adjustments, Settlements, and Unusual Provisions		(1,400,000)	(11,000,000)	(41,300,000)
Other_Income_From_Tax_Settlement_Pretax		4,000,000		17,500,000
Other_Income_From_Tax_Settlement_Aftertax		2,600,000		11,400,000
Proceeds from Income Tax Refunds	17,500,000		60,400,000
Impact_of_Reinstatement_of_Exemption_of_Active_Finance_Income		900,000
Operating Loss Carryforwards		0	0
Valuation Allowance, Deferred Tax Asset, Change in Amount				4,100,000
Income Taxes Paid, Net		398,100,000	185,000,000	303,500,000
Minimum
Income Taxes [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		0
Maximum
Income Taxes [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		$ 8,000,000

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Quantitative Information Regarding Significant Unobservable Inputs (Details) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	$ (53.2)		$ (83.9)
States, Municipalities, and Political Subdivisions
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	142.7		42.7
States, Municipalities, and Political Subdivisions | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.25%	[1]	0.25%	[1]
Volatility of Credit			0.15%	[2]
Lack of Marketability			0.25%	[3]
States, Municipalities, and Political Subdivisions | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	1.25%	[1]	0.25%	[1]
Volatility of Credit			0.15%	[2]
Lack of Marketability			0.25%	[3]
States, Municipalities, and Political Subdivisions | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.65%	[1]	0.25%	[1]
Volatility of Credit			0.15%	[2]
Lack of Marketability			0.25%	[3]
Public Utilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	64.3		17.4
Public Utilities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[1]
Volatility of Credit	0.75%	[2]
Public Utilities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[1]
Volatility of Credit	1.25%	[2]
Public Utilities | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[1]
Volatility of Credit	0.92%	[2]
Mortgage/Asset-backed Securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	0.5		0.5
Mortgage/Asset-backed Securities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	4.93%	[4]	5.74%	[4]
Mortgage/Asset-backed Securities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	5.03%	[4]	5.84%	[4]
Mortgage/Asset-backed Securities | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	5.01%	[4]	5.81%	[4]
All Other Corporate Bonds - Private
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	307.0		391.8
All Other Corporate Bonds - Private | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions to Calculating Fair Value of Level 3 Instrument	Priced at Par	[5]	Priced at Par	[5]
All Other Corporate Bonds - Private | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.70%)	[1]	1.48%	[1]
Volatility of Credit	0.07%	[2]	(0.25%)	[2]
Discount for Size	0.50%	[4]	0.10%	[4]
Change in Benchmark Reference	3.36%	[6]	0.04%	[6]
Lack of Marketability	0.20%	[3]	0.10%	[3]
All Other Corporate Bonds - Private | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.40%)	[1]	1.48%	[1]
Volatility of Credit	4.00%	[2]	7.72%	[2]
Discount for Size	0.50%	[4]	0.50%	[4]
Change in Benchmark Reference	3.36%	[6]	2.89%	[6]
Lack of Marketability	1.00%	[3]	1.00%	[3]
All Other Corporate Bonds - Private | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.60%)	[1]	1.48%	[1]
Volatility of Credit	0.84%	[2]	1.51%	[2]
Discount for Size	0.50%	[4]	0.24%	[4]
Change in Benchmark Reference	3.36%	[6]	0.28%	[6]
Lack of Marketability	0.55%	[3]	0.46%	[3]
Corporate Bond Securities - Public
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	514.4		165.0
Corporate Bond Securities - Public | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions to Calculating Fair Value of Level 3 Instrument			Priced at Par	[5]
Corporate Bond Securities - Public | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.23%)	[1]	(0.59%)	[1]
Volatility of Credit	(0.88%)	[2]	(0.30%)	[2]
Discount for Size			0.25%	[4]
Change in Benchmark Reference	(0.32%)	[6]	0.25%	[6]
Lack of Marketability	0.20%	[3]	0.20%	[3]
Corporate Bond Securities - Public | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	1.00%	[1]	1.00%	[1]
Volatility of Credit	0.46%	[2]	(0.30%)	[2]
Discount for Size			0.25%	[4]
Change in Benchmark Reference	0.25%	[6]	0.25%	[6]
Lack of Marketability	0.20%	[3]	0.30%	[3]
Corporate Bond Securities - Public | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.41%	[1]	0.27%	[1]
Volatility of Credit	(0.26%)	[2]	(0.30%)	[2]
Discount for Size			0.25%	[4]
Change in Benchmark Reference	0.04%	[6]	0.25%	[6]
Lack of Marketability	0.20%	[3]	0.24%	[3]
Equity Securites
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Quantitative unobservable inputs Level 3 fair value - internally derived	$ 4.2		$ 4.0
Equity Securites | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions to Calculating Fair Value of Level 3 Instrument	Priced at Cost or Owner's Equity	[5]	Priced at Cost or Owner's Equity	[5]
Embedded Derivative in Modified Coinsurance Arrangement | Projected Cash Flows
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions to Calculating Fair Value of Level 3 Instrument	Actuarial Assumptions	[7]	Actuarial Assumptions	[7]

[1] Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

[2] Represents basis point adjustments for credit-specific factors

[3] Represents basis point adjustments to apply a discount due to the illiquidity of an investment

[4] Represents basis point adjustments based on issue/issuer size relative to the benchmark

[5] Represents a decision to price based on par value, cost, or owner's equity when limited data is available

[6] Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

[7] Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

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Stock-Based Compensation Stock-Based Compensation - Cash Settled Awards Classified as Liability (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Cash Settled Awards Classified as Liabilities [Roll Forward]
Weighted Average Grant Date Fair Value of Shares Granted	$ 23.97
Cash Settled Awards
Share-based Compensation Arrangement by Share-based Payment Award, Cash Settled Awards Classified as Liabilities [Roll Forward]
Shares Outstanding Beginning Balance	207
Shares Granted	60
Shares Vested	(102)
Shares Outstanding Ending Balance	165	207
Weighted Average Grant Date Fair Value at Beginning of Period	$ 23.72
Weighted Average Grant Date Fair Value of Shares Granted	$ 24.22	$ 23.23	$ 26.22
Weighted Average Grant Date Fair Value of Shares Vested	$ 23.29
Weighted Average Grant Date Fair Value at End of Period	$ 24.09	$ 23.72

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Schedule III Supplementary Insurance Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Supplementary Insurance Information, by Segment [Line Items]
Unclaimed Death Benefit Reserve Increase Before Taxes	$ 95.5
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	85.0
Deferred Acquisition Costs	1,829.2		1,755.5
Reserves for Future Policy Contract Benefits	43,099.1		44,694.4
Unearned Premiums	413.8		426.7
Policy and Contract Benefits	1,511.0		1,484.6
Premium Income	7,624.7		7,716.1		7,514.2
Net Investment Income	2,492.1	[1]	2,515.2	[1]	2,519.6	[1]
Benefits and Change in Reserves for Future Benefits	6,595.7	[1]	6,722.2		7,209.5	[1]
Amortization of Deferred Acquisition Costs	418.9		378.7		365.7
All Other Expenses	2,134.0	[2]	2,165.0	[2]	2,369.5	[2]
Impairment of Deferred Acquisition Costs	0		0		196.0
Unum U.S.
Supplementary Insurance Information, by Segment [Line Items]
Unclaimed Death Benefit Reserve Increase Before Taxes	75.4		0		0
Deferred Acquisition Costs	1,051.5		1,024.3
Reserves for Future Policy Contract Benefits	11,788.4		12,449.3
Unearned Premiums	47.6		46.1
Policy and Contract Benefits	889.1		890.3
Premium Income	4,517.1		4,456.5		4,296.0
Net Investment Income	929.6	[1]	952.3	[1]	951.4	[1]
Benefits and Change in Reserves for Future Benefits	3,222.4	[1]	3,238.6		3,113.5	[1]
Amortization of Deferred Acquisition Costs	230.0		196.5		188.1
All Other Expenses	1,254.0	[2]	1,251.2	[2]	1,250.5	[2]
Premiums Written	3,068.0	[3]	3,045.0	[3]	2,965.8	[3]
Long-term Care
Supplementary Insurance Information, by Segment [Line Items]
Impairment of Deferred Acquisition Costs	0		0		769.6
Unum U.K.
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	34.3		38.8
Reserves for Future Policy Contract Benefits	2,594.3		2,487.1
Unearned Premiums	139.3		142.9
Policy and Contract Benefits	160.0		155.7
Premium Income	556.6		694.6		687.6
Net Investment Income	148.5	[1]	170.8	[1]	189.9	[1]
Benefits and Change in Reserves for Future Benefits	413.3	[1]	541.4		493.8	[1]
Amortization of Deferred Acquisition Costs	14.7		15.7		15.3
All Other Expenses	145.2	[2]	177.1	[2]	178.0	[2]
Premiums Written	448.1	[3]	466.3	[3]	480.0	[3]
Colonial Life
Supplementary Insurance Information, by Segment [Line Items]
Unclaimed Death Benefit Reserve Increase Before Taxes	20.1		0		0
Deferred Acquisition Costs	743.4		692.4
Reserves for Future Policy Contract Benefits	1,815.6		1,691.3
Unearned Premiums	30.0		29.9
Policy and Contract Benefits	193.7		149.8
Premium Income	1,232.2		1,194.5		1,135.3
Net Investment Income	145.4	[1]	138.6	[1]	132.4	[1]
Benefits and Change in Reserves for Future Benefits	667.0	[1]	627.3		589.4	[1]
Amortization of Deferred Acquisition Costs	174.2		166.5		151.2
All Other Expenses	271.8	[2]	265.3	[2]	257.5	[2]
Premiums Written	1,011.8	[3]	986.3	[3]	944.9	[3]
Closed Block
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	0		0
Reserves for Future Policy Contract Benefits	26,900.8		28,066.7
Unearned Premiums	196.9		207.8
Policy and Contract Benefits	268.2		288.8
Premium Income	1,318.8		1,370.5		1,395.3
Net Investment Income	1,272.3	[1]	1,230.5	[1]	1,189.7	[1]
Benefits and Change in Reserves for Future Benefits	2,293.0	[1]	2,314.9		3,012.8	[1]
Amortization of Deferred Acquisition Costs	0		0		11.1
All Other Expenses	282.6	[2]	290.7	[2]	496.4	[2]
Premiums Written	1,307.0	[3]	1,358.6	[3]	1,385.1	[3]
Impairment of Deferred Acquisition Costs					196.0
Corporate
Supplementary Insurance Information, by Segment [Line Items]
Premium Income	0		0		0
Net Investment Income	(3.7)	[1]	23.0	[1]	56.2	[1]
Benefits and Change in Reserves for Future Benefits	0	[1]	0		0	[1]
Amortization of Deferred Acquisition Costs	0		0		0
All Other Expenses	180.4	[2]	180.7	[2]	187.1	[2]
Premiums Written	0	[3]	0	[3]	0	[3]
Individual Disability - Closed Block
Supplementary Insurance Information, by Segment [Line Items]
Reserve Increase Due to Unlocking	0		0		183.5
Claim Reserve Total [Member] | Long-term Care
Supplementary Insurance Information, by Segment [Line Items]
Reserve Increase Due to Unlocking					248.1
Impairment of Deferred Acquisition Costs			573.6
Group Life | Unum U.S.
Supplementary Insurance Information, by Segment [Line Items]
Unclaimed Death Benefit Reserve Increase Before Taxes	49.1
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	$ 85.0		$ 0		$ 0

[1] (1)Net investment income is allocated based upon segmentation. Each segment has its own specifically identified assets and receives the investment income generated by those assets.

[2] (3)Includes commissions, interest and debt expense, deferral of acquisition costs, compensation expense, non-operating retirement related loss, and other expenses. Where not directly attributable to a segment, expenses are generally allocated based on activity levels, time information, and usage statistics. Included in 2011 in the Closed Block segment is an impairment charge of $196.0 million related to long-term care deferred policy acquisition costs.

[3] (4)Excludes life insurance.

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Location of and Gain (Loss) on Derivative Financial Instruments Not Designated as Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Realized Investment Gain (Loss)
Gain (Loss) on Embedded Derivative	$ 30.7	$ 51.8	$ (39.4)
Net Realized Investments Gain (Loss)
Net Realized Investment Gain (Loss)
Credit Default Swap Loss	(1.9)	0	0
Gain (Loss) on Embedded Derivative	30.7	51.8	(39.4)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	$ 28.8	$ 51.8	$ (39.4)

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Schedule of deferred income tax assets and liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Acquisition Cost	$ 70.0	$ 39.3
Deferred Tax Liabilities, Property, Plant and Equipment	80.3	74.1
Deferred Tax Liabilities, Investments	1,274.3	2,342.8
Other	54.4	63.2
Gross Deferred Tax Liability	1,479.0	2,519.4
Invested Assets	1,180.1	1,934.2
Employee Benefits	151.2	315.2
Other	3.4	0.6
Gross Deferred Tax Asset	1,334.7	2,250.0
Total Net Deferred Tax Liability	$ 144.3	$ 269.4

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Schedule of Net Unrealized Gain on Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in Components of Net Unrealized Gain on Securities
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ (2,101.2)	$ 918.8	$ 1,519.8
Fixed Maturity Securities
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	7,221.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(3,166.7)
Balance, End of Period, Net of Tax	4,054.8
Other Investments
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	92.8
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(37.3)
Balance, End of Period, Net of Tax	55.5
Deferred Acquisition Costs
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(67.0)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	25.4
Balance, End of Period, Net of Tax	(41.6)
Reserve for Future Policy and Contract Benefits
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(6,277.5)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	2,169.0
Balance, End of Period, Net of Tax	(4,108.5)
Reinsurance Recoverable
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	351.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(87.7)
Balance, End of Period, Net of Tax	263.8
Deferred Income Tax Charges
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(447.8)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	359.5
Balance, End of Period, Net of Tax	(88.3)
Net Unrealized Gain on Securities
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	873.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(737.8)
Balance, End of Period, Net of Tax	$ 135.7

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Schedule of Income subject to domestic and foreign taxation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Before Tax United States - Federal									$ 1,072.0	$ 1,128.4	$ 160.5
Income Before Tax Foreign									133.2	121.1	172.8
Income Before Income Tax	305.8	284.1	311.5	303.8	322.7	320.4	296.4	310.0	1,205.2	1,249.5	333.3
Current Tax Expense United States - Federal									277.9	164.4	218.4
Current Tax Expense Foreign									18.7	42.2	12.1
Current Tax Expense Total									296.6	206.6	230.5
Deferred Tax Expense (Benefit) United States - Federal									47.3	173.5	(203.4)
Deferred Tax Expense (Benefit) Foreign									3.2	(25.0)	22.0
Income Tax (Benefit) - Deferred									50.5	148.5	(181.4)
Income Tax Expense (Benefit)									$ 347.1	$ 355.1	$ 49.1

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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Credit Exposure on Derivatives	$ 5.5
Cash collateral from counterparties	(1.1)	0
Carrying value of fixed maturity securities posted as collateral to our counterparties	95.6	108.6
Cash Collateral to counterparties	0	(1.8)
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	135.6	170.5
Derivative, Notional Amount	1,477.4	1,432.8	1,413.0	1,681.9
Additions	291.0	336.0	46.9
Material Ineffectiveness on Cash Flow Hedges	0	0	0
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness	0	0	0
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months	46.7
Material Ineffectiveness on Fair Value Hedges	0	0	0
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net	0	0	0
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as FV Hedge	0
Interest Rate Swaps | Cash Flow Hedge
Derivative [Line Items]
Derivative, Notional Amount	630.4	508.8
Foreign Currency Swap | Cash Flow Hedge
Derivative [Line Items]
Additions	150.0
Receive Variable/Pay Fixed | Cash Flow Hedge
Derivative [Line Items]
Derivative, Notional Amount		150.0
Receive Variable/Pay Fixed | Interest Rate Swaps
Derivative [Line Items]
Derivative, Notional Amount	150.0	174.0
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(11.5)	(1.2)	8.1
Receive Fixed/Pay Variable | Interest Rate Swaps
Derivative [Line Items]
Derivative, Notional Amount	600.0	600.0
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	21.1	(6.6)	(23.2)
Receive Fixed/Pay Variable | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	600.0
Credit Default Swaps
Derivative [Line Items]
Derivative, Notional Amount	$ 97.0	$ 0

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Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fixed Maturity Securities
Gross Gains on Sales									$ 15.8	$ 29.3	$ 74.0
Gross Losses on Sales									(45.7)	(20.4)	(24.0)
Other-Than-Temporary Impairment Loss									(0.8)	0	(19.9)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales									15.6	5.0	7.1
Other Investments Gross Realized Losses									0	(4.3)	(0.5)
Impairment Loss									(2.0)	(1.9)	(0.6)
Gain (Loss) on Embedded Derivative									30.7	51.8	(39.4)
Derivative, Gain (Loss) on Derivative, Net									(1.9)	0	0
Foreign Currency Transactions									(4.9)	(3.3)	(1.6)
Net Realized Investment Gain (Loss)	$ 9.3	$ (26.1)	$ 13.3	$ 10.3	$ 24.6	$ 21.3	$ (2.1)	$ 12.4	$ 6.8	$ 56.2	$ (4.9)

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Unaudited Quarterly Results

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

The following is a summary of our unaudited quarterly results of operations for 2013 and 2012:

	2013
	4th		3rd			2nd		1st
	(in millions of dollars, except share data)
Premium Income	$	1,890.7	$	1,897.3		$	1,905.8	$	1,930.9
Net Investment Income	629.4		615.5			626.1		621.1
Net Realized Investment Gain (Loss)	9.3		(26.1		)	13.3		10.3
Total Revenue	2,586.2		2,540.9			2,601.9		2,624.8
Income Before Income Tax	305.8		284.1			311.5		303.8
Net Income	221.2		205.7			218.6		212.6
Net Income Per Common Share
Basic	0.85		0.78			0.82		0.79
Assuming Dilution	0.84		0.78			0.82		0.79

	2012
	4th		3rd		2nd			1st
	(in millions of dollars, except share data)
Premium Income	$	1,937.2	$	1,929.4	$	1,927.6		$	1,921.9
Net Investment Income	643.0		619.2		633.5			619.5
Net Realized Investment Gain (Loss)	24.6		21.3		(2.1		)	12.4
Total Revenue	2,658.2		2,628.0		2,617.9			2,611.3
Income Before Income Tax	322.7		320.4		296.4			310.0
Net Income	233.9		230.2		216.4			213.9
Net Income Per Common Share
Basic	0.86		0.83		0.76			0.74
Assuming Dilution	0.85		0.83		0.76			0.73

Items affecting the comparability of our financial results during the fourth quarter of 2013 are as follows:

• A reserve increase of $95.5 million before tax and $62.1 million after tax related to unclaimed death benefits.

• A reserve reduction of $85.0 million before tax and $55.2 million after tax related to group life waiver of premium benefits.

See Notes 6 and 14 for further discussion of the above items.

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Schedule IV Reinsurance (Tables)

12 Months Ended

Dec. 31, 2013

Schedule IV - Reinsurance [Abstract]

Supplemental Schedule of Reinsurance Premiums for Insurance Companies

SCHEDULE IV--REINSURANCE

Unum Group and Subsidiaries

	Gross Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage Amount Assumed to Net
	(in millions of dollars)
Year Ended December 31, 2013
Life Insurance in Force	$	781,495.9	$	25,904.7	$	1,026.2	$	756,617.4	0.1	%
Premium Income:
Life Insurance	$	2,018.7	$	253.6	$	10.0	$	1,775.1	0.6	%
Accident, Health, and Other Insurance	5,758.6		102.2		193.2		5,849.6		3.3	%
Total	$	7,777.3	$	355.8	$	203.2	$	7,624.7	2.7	%
Year Ended December 31, 2012
Life Insurance in Force	$	832,587.5	$	28,658.7	$	1,073.8	$	805,002.6	0.1	%
Premium Income:
Life Insurance	$	1,979.1	$	141.4	$	10.3	$	1,848.0	0.6	%
Accident, Health, and Other Insurance	5,756.9		89.4		200.6		5,868.1		3.4	%
Total	$	7,736.0	$	230.8	$	210.9	$	7,716.1	2.7	%
Year Ended December 31, 2011
Life Insurance in Force	$	782,935.6	$	28,341.1	$	1,141.6	$	755,736.1	0.2	%
Premium Income:
Life Insurance	$	1,868.8	$	146.6	$	10.9	$	1,733.1	0.6	%
Accident, Health, and Other Insurance	5,652.7		77.3		205.7		5,781.1		3.6	%
Total	$	7,521.5	$	223.9	$	216.6	$	7,514.2	2.9	%

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options Activity

Stock option activity is summarized as follows:

					Remaining	Intrinsic
	Shares		Weighted Average		Contractual Term	Value
	(000s)		Exercise Price		(in years)	(in millions)
Outstanding at December 31, 2012	1,691		$	20.98
Granted	103		24.25
Exercised	(399	)	21.15
Outstanding at December 31, 2013	1,395		21.17		4.2	$	19.4
Exercisable at December 31, 2013	1,041		$	20.15	3.5	$	15.5

Schedule of Compensation Cost for Share-based Payment Arrangements

Compensation expense for the stock plans, as reported in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Performance Share Units	$	1.1	$	—	$	—
Restricted Stock Units and Cash-Settled Awards	21.0		20.9		19.6
Stock Options	1.0		2.7		2.7
Other	0.5		0.6		1.2
Total Compensation Expense, Before Income Tax	$	23.6	$	24.2	$	23.5
Total Compensation Expense, Net of Income Tax	$	15.6	$	15.6	$	15.3

Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units and Cash Settled Awards Activity

Activity for RSUs classified as equity is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	1,403		$	23.57
Granted	731		24.68
Vested	(790	)	23.12
Forfeited	(22	)	24.22
Outstanding at December 31, 2013	1,322		24.35

Cash Settled Awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units and Cash Settled Awards Activity

Activity for cash-settled awards classified as a liability is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	207		$	23.72
Granted	60		24.22
Vested	(102	)	23.29
Outstanding at December 31, 2013	165		24.09

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Location of Gains and Losses on Derivative Financial Instruments Designated as Cash Flow Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 15.3	$ 81.4	$ 72.7
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	23.0	20.1	45.7
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(7.2)	77.9	50.3
Interest Rate Swaps | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	43.1	40.0	34.8
Interest Rate Swaps | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	1.3	4.1	3.5
Interest Rate Swaps | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1.7)	(1.7)	(1.6)
Options Held
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(0.1)	0	0
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	22.6	3.5	22.4
Foreign Exchange Contracts | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(5.9)	(5.3)	(1.1)
Foreign Exchange Contracts | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (13.8)	$ (17.0)	$ 10.1

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Employee Benefit Plans US Changes in Assets measured at fair value using significant unobservable inputs (Details) (Fair Value, Inputs, Level 3, Pension Benefits, U.S. Plans, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 103.7	$ 84.8	$ 68.0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	7.5	4.3
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	1.1	1.0
Purchases	15.4	17.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(5.1)	(6.3)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
PrivateEquityDirectInvestment [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	7.2	0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.3
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0
Purchases	8.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(1.5)
Level 3 Transfers Into	0
Level 3 Transfers Out of	0
Hedge Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	66.9	56.1	44.3
Defined Benefit Plan, Actual Return on Plan Assets Still Held	6.3	3.8
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0	0
Purchases	4.9	11.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(0.4)	(3.8)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
Private Equity Funds
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	29.6	28.7	23.7
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.9	0.5
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	1.1	1.0
Purchases	2.1	6.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3.2)	(2.5)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	$ 0	$ 0

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Liability for Unpaid Claims (Tables)

12 Months Ended

Dec. 31, 2013

Insurance [Abstract]

Schedule of Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

Changes in the liability for unpaid claims and claim adjustment expenses are as follows:

	2013			2012			2011
	(in millions of dollars)
Balance at January 1	$	24,567.1		$	24,586.5		$	24,339.4
Less Reinsurance Recoverable	2,006.0			2,042.6			2,028.2
Net Balance at January 1	22,561.1			22,543.9			22,311.2
Incurred Related to
Current Year	4,751.9			4,946.2			4,684.4
Prior Years
Interest	1,230.0			1,247.6			1,262.9
All Other Incurred	(44.7		)	(175.7		)	209.1
Foreign Currency	41.2			101.1			(10.9		)
Total Incurred	5,978.4			6,119.2			6,145.5
Paid Related to
Current Year	(1,657.3		)	(1,715.4		)	(1,588.6		)
Prior Years	(4,419.4		)	(4,386.6		)	(4,324.2		)
Total Paid	(6,076.7		)	(6,102.0		)	(5,912.8		)
Net Balance at December 31	22,462.8			22,561.1			22,543.9
Plus Reinsurance Recoverable	2,072.8			2,006.0			2,042.6
Balance at December 31	$	24,535.6		$	24,567.1		$	24,586.5

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

A reconciliation of policy and contract benefits and reserves for future policy and contract benefits as reported in our consolidated balance sheets to the liability for unpaid claims and claim adjustment expenses is as follows:

	December 31
	2013		2012		2011
	(in millions of dollars)
Policy and Contract Benefits	$	1,511.0	$	1,484.6	$	1,494.0
Reserves for Future Policy and Contract Benefits	43,099.1		44,694.4		43,051.9
Total	44,610.1		46,179.0		44,545.9
Less:
Life Reserves for Future Policy and Contract Benefits	7,740.5		7,571.1		7,454.2
Accident and Health Active Life Reserves	8,225.5		7,763.3		7,259.6
Unrealized Adjustment to Reserves for Future Policy and Contract Benefits	4,108.5		6,277.5		5,245.6
Liability for Unpaid Claims and Claim Adjustment Expenses	$	24,535.6	$	24,567.1	$	24,586.5

The unrealized adjustment to reserves for future policy and contract benefits reflects the changes that would be necessary to policyholder liabilities if the unrealized investment gains and losses related to the available-for-sale securities had been realized. Changes in this adjustment are reported as a component of other comprehensive income or loss.

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Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Integer		Dec. 31, 2012	Dec. 31, 2011
Number of Operating Segments	3
Policy Loans	$ 3,276.0	[1]	$ 3,133.8
Accumulated Depreciation for Property and Equipment	760.8		705.0
Value of Business Acquired	19.0		23.5
Accumulated Amortization of Value of Business Acquired	138.2		131.5
Amortization of Value of Business Acquired	4.5		7.5	7.4
Deferred Gain on Reinsurance	53.6		67.4
Premium tax expense	137.0		136.0	134.9
Assets, Participation Fund Account (PFA)	$ 339.2		$ 380.4

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Impaired Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Recorded Investment		$ 17.4
Unpaid Principal Balance		18.9
Related Allowance		1.5
Impaired Fin Receivables with Allowance [Member]
Recorded Investment	13.1	13.1
Unpaid Principal Balance	14.6	14.6
Related Allowance	1.5	1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment		4.3
Unpaid Principal Balance		4.3
Related Allowance		$ 0

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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value of Shares Granted	$ 23.97
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	$ 11.4	$ 4.9	$ 14.8
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Approximate Shares Granted	100,000
Weighted Average Grant Date Fair Value of Shares Granted	$ 25.26
Nonvested Awards, Total Compensation Cost Not yet Recognized	2.1
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards	2 years
Percentage of Shares Expected to Vest for Unrecognized Compensation Cost and Compensation Expense	100.00%
Expected Volatility Rate	35.00%
Expected Life	3 years
Expected Dividend Rate	2.17%
Risk Free Interest Rate	0.38%
Performance Share Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Stock-based Awards Possible to be Earned	0.00%
Performance Share Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Stock-based Awards Possible to be Earned	180.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate Shares Granted	731,000
Weighted Average Grant Date Fair Value of Shares Granted	$ 24.68	$ 22.96	$ 26.13
Nonvested Awards, Total Compensation Cost Not yet Recognized	10.6
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards	292 days
Fair Value of Awards Vested During the Period	18.3	19.5	19.2
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Cash Settled Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate Shares Granted	60,000
Weighted Average Grant Date Fair Value of Shares Granted	$ 24.22	$ 23.23	$ 26.22
Nonvested Awards, Total Compensation Cost Not yet Recognized	0
Fair Value of Awards Vested During the Period	2.4	1.5	0.7
Cash Used to Settle Awards	2.5	1.5	0.9
Cash Settled Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
Cash Settled Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards	252 days
Expected Volatility Rate	52.00%	52.00%	53.00%
Expected Life	6 years	6 years	5 years 6 months
Expected Dividend Rate	2.14%	1.80%	1.41%
Risk Free Interest Rate	1.12%	1.13%	2.37%
Intrinsic Value of Options Exercised	4.4	0.6	3.9
Fair Value of Options that Vested During the Period	2.4	2.3	2.7
Unrecognized Compensation Cost on Stock Options	$ 0.6
Weighted Average Grant Date Fair Value of Shares Granted	$ 9.77	$ 9.78	$ 11.73
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Stock Incentive Plan 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	20,000,000
Number of Shares for Each Full Value Award	1.76
Total Duration of the Stock Incentive Plan	8 years
Award Vesting Period	3 years
Number of Shares Available for Grant	18,310,000
Stock Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	35,000,000
Number of Shares for Each Full Value Award	2.7
Total Duration of the Stock Incentive Plan	8 years
Award Vesting Period	3 years

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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 903.9	$ 956.4
Over 1 year through 5 years	7,098.2	5,922.8
Over 5 years through 10 years	9,492.6	9,752.3
Over 10 years	18,936.2	19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal	36,430.9	35,823.6
Mortgage/Asset-Backed Securities	1,858.7	1,927.9
Total Fixed Maturity Securities	38,289.6	37,751.5
Fair Value Maturity Distribution [Abstract]
Total Fixed Maturity Securities	42,344.4	44,973.0
Fair Value of Fixed Maturity Securities in Unrealized Gain Position
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	20.6	21.2
Over 1 year through 5 years	727.1	628.1
Over 5 years through 10 years	940.2	1,606.4
Over 10 years	2,486.2	4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal	4,174.1	6,988.4
Mortgage/Asset-Backed Securities	184.6	289.1
Total Fixed Maturity Securities	4,358.7	7,277.5
Fair Value Maturity Distribution [Abstract]
1 year or less	915.5	934.1
Over 1 year through 5 years	7,678.5	6,449.8
Over 5 years through 10 years	8,137.4	10,997.0
Over 10 years	18,441.5	23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	35,172.9	41,581.1
Mortgage/Asset-Backed Securities	1,695.8	2,208.3
Total Fixed Maturity Securities	36,868.7	43,789.4
Fair Value of Fixed Maturity Securities in Unrealized Loss Position
Fair Value Maturity Distribution [Abstract]
1 year or less	9.0	43.0
Over 1 year through 5 years	146.2	96.1
Over 5 years through 10 years	2,199.6	354.1
Over 10 years	2,777.4	682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	5,132.2	1,175.4
Mortgage/Asset-Backed Securities	343.5	8.2
Total Fixed Maturity Securities	5,475.7	1,183.6
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0	0.5
Over 1 year through 5 years	0.6	5.0
Over 5 years through 10 years	95.8	7.6
Over 10 years	203.5	42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal	299.9	55.5
Mortgage/Asset-Backed Securities	4.0	0.5
Total Fixed Maturity Securities	$ 303.9	$ 56.0

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Schedule I Summary of Investments (Tables)

12 Months Ended

Dec. 31, 2013

Schedule I - Summary of Investments [Abstract]

Investment Holdings, Schedule of Investments [Table Text Block]

Type of Investment	Cost or Amortized Cost (1)		Fair Value		Amount shown on the balance sheet
	(in millions of dollars)
Fixed Maturity Securities:
Bonds
United States Government and Government Agencies and Authorities	$	1,028.6	$	1,196.1	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		1,783.2		1,783.2
Foreign Governments	1,226.4		1,373.2		1,373.2
Public Utilities	9,328.9		10,403.0		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		2,039.3		2,039.3
All Other Corporate Bonds	23,108.0		25,511.9		25,511.9
Redeemable Preferred Stocks	33.0		37.7		37.7
Total	38,289.6		$	42,344.4	42,344.4
Mortgage Loans	1,815.1				1,815.1
Policy Loans	3,276.0				3,276.0
Other Long-term Investments
Derivatives	—				10.8		(2)
Equity Securities	11.3				16.4
Miscellaneous Long-term Investments	530.7				538.8		(3)
Short-term Investments	913.4				913.4
Total Investments	$	44,836.1			$	48,914.9

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities
Net Income	$ 858.1	$ 894.4	$ 284.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(196.7)	40.4	37.0
Change in Deferred Acquisition Costs	(47.9)	(88.6)	(76.8)
Impairment of Deferred Acquisition Costs	0	0	196.0
Change in Insurance Reserves and Liabilities	572.5	508.4	1,113.9
Change in Income Taxes	(49.4)	168.0	(274.4)
Change in Other Accrued Liabilities	21.2	18.6	68.4
Non-cash Adjustments to Net Investment Income	(211.5)	(221.3)	(240.6)
Net Realized Investment (Gain) Loss	(6.8)	(56.2)	4.9
Depreciation	84.8	84.3	81.1
Other, Net	7.2	31.6	0
Net Cash Provided by Operating Activities	1,031.5	1,379.6	1,193.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	1,040.5	595.9	1,181.9
Proceeds from Maturities of Fixed Maturity Securities	2,146.4	2,160.5	1,692.7
Proceeds from Sales and Maturities of Other Investments	243.4	182.2	131.9
Purchase of Fixed Maturity Securities	(3,553.6)	(3,512.8)	(2,760.1)
Purchase of Other Investments	(363.7)	(353.8)	(304.1)
Net Sales (Purchases) of Short-term Investments	552.4	(80.1)	(254.6)
Net Purchases of Property and Equipment	(105.5)	(105.4)	(98.2)
Other, Net	0.2	0.1	0.2
Net Cash Provided by (Used in) Investing Activities	(39.9)	(1,113.4)	(410.3)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(379.3)	143.5	87.2
Issuance of Long-term Debt	0	246.4	0
Long-term Debt Repayments	(116.2)	(70.0)	(84.4)
Issuance of Common Stock	11.4	4.9	14.8
Repurchase of Common Stock	(317.2)	(496.7)	(619.9)
Dividends Paid to Stockholders	(146.5)	(133.8)	(121.0)
Other, Net	(27.0)	0.2	2.9
Net Cash Used by Financing Activities	(974.8)	(305.5)	(720.4)
Net Increase (Decrease) in Cash and Bank Deposits	16.8	(39.3)	63.0
Cash and Bank Deposits at Beginning of Year	77.3	116.6	53.6
Cash and Bank Deposits at End of Year	$ 94.1	$ 77.3	$ 116.6

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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Premium Income	$ 1,890.7	$ 1,897.3	$ 1,905.8	$ 1,930.9	$ 1,937.2	$ 1,929.4	$ 1,927.6	$ 1,921.9	$ 7,624.7	$ 7,716.1	$ 7,514.2
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									4,517.1	4,456.5	4,296.0
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income									556.6	694.6	687.6
Colonial Life
Segment Reporting Information [Line Items]
Premium Income									1,232.2	1,194.5	1,135.3
Closed Block
Segment Reporting Information [Line Items]
Premium Income									1,318.8	1,370.5	1,395.3
Group Long term Disability [Member] | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									1,553.9	1,578.8	1,580.2
Group Long term Disability [Member] | Unum U.K.
Segment Reporting Information [Line Items]
Premium Income									389.9	409.7	419.6
Group Short term Disability [Member] | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									519.6	476.7	455.2
Group Life | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									1,213.9	1,182.1	1,106.7
Group Life | Unum U.K.
Segment Reporting Information [Line Items]
Premium Income									106.4	221.3	203.6
Accidental Death Dismemberment [Member] | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									121.6	115.3	109.2
Individual Disability Recently Issued [Member] | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									465.3	477.6	464.7
Voluntary Benefits [Member] | Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									642.8	626.0	580.0
Supplemental and Voluntary Insurance [Member] | Unum U.K.
Segment Reporting Information [Line Items]
Premium Income									60.3	63.6	64.4
Accident and Health Insurance Segment
Segment Reporting Information [Line Items]
Premium Income									5,849.6	5,868.1	5,781.1
Accident and Health Insurance Segment | Colonial Life
Segment Reporting Information [Line Items]
Premium Income									738.7	724.5	695.3
Life Insurance Product Line
Segment Reporting Information [Line Items]
Premium Income									1,775.1	1,848.0	1,733.1
Life Insurance Product Line | Colonial Life
Segment Reporting Information [Line Items]
Premium Income									221.1	209.7	190.7
Cancer and Critical Illness Colonial [Member] | Colonial Life
Segment Reporting Information [Line Items]
Premium Income									272.4	260.3	249.3
Individual Disability Insurance [Member] | Closed Block
Segment Reporting Information [Line Items]
Premium Income									687.5	736.4	787.0
Long-term Care | Closed Block
Segment Reporting Information [Line Items]
Premium Income									630.6	631.9	608.1
Other Insurance Product Line | Closed Block
Segment Reporting Information [Line Items]
Premium Income									$ 0.7	$ 2.2	$ 0.2

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Mortgage Loans by Property Type (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,815.1	[1]	$ 1,712.7
Percent of Total	100.00%		100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	61.1		47.2
Percent of Total	3.30%		2.70%
Industrial
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	567.8		545.7
Percent of Total	31.30%		31.90%
Office
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	776.5		721.2
Percent of Total	42.80%		42.10%
Retail
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 409.7		$ 398.6
Percent of Total	22.60%		23.30%

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Parent Company Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Fixed Maturity Securities	$ 42,344.4	$ 44,973.0
Other Long-term Investments	566.0	625.0
Short-term Investments	913.4	1,460.3
Other Assets	647.8	625.4
Total Assets	59,403.6	62,236.1
Liabilities
Short-term Debt	76.5	455.8
Long-term Debt	2,612.0	2,755.4
Other Liabilities	1,229.4	1,838.1
Total Liabilities	50,744.5	53,623.5
Stockholders' Equity
Common Stock	36.1	36.0
Additional Paid-in Capital	2,634.1	2,607.7
Accumulated Other Comprehensive Income	255.0	628.0
Retained Earnings	8,083.2	7,371.6
Treasury Stock	(2,349.3)	(2,030.7)
Total Stockholders' Equity	8,659.1	8,612.6	8,169.7
Total Liabilities and Stockholders' Equity	59,403.6	62,236.1
Parent Company
Assets [Abstract]
Fixed Maturity Securities	145.3	224.6
Other Long-term Investments	57.2	73.0
Short-term Investments	164.0	433.5
Investments in Subsidiaries	10,082.8	10,079.1
Deferred Income Tax	68.1	234.1
Other Assets	558.8	489.1
Total Assets	11,076.2	11,533.4
Liabilities
Short-term Debt	0.3	6.6
Long-term Debt	1,875.2	1,896.2
Pension and Postretirement Benefits	295.3	801.6
Other Liabilities	246.3	216.4
Total Liabilities	2,417.1	2,920.8
Stockholders' Equity
Common Stock	36.1	36.0
Additional Paid-in Capital	2,634.1	2,607.7
Accumulated Other Comprehensive Income	255.0	628.0
Retained Earnings	8,083.2	7,371.6
Treasury Stock	(2,349.3)	(2,030.7)
Total Stockholders' Equity	8,659.1	8,612.6
Total Liabilities and Stockholders' Equity	$ 11,076.2	$ 11,533.4

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Schedule V Valuation and Qualifying Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for Loan and Lease Losses, Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 0.3		$ 0.3		$ 0.3
Additions Charged to Costs and Expenses	1.5		0		0
Additions Charged to Other Accounts	0		0		0
Deductions	0	[1]	0	[1]	0	[1]
Balance at End of Period	1.8		0.3		0.3
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	6.2		5.7		7.2
Additions Charged to Costs and Expenses	0.7		0.9		1.3
Additions Charged to Other Accounts	0		0		0
Deductions	1.3	[1]	0.4	[1]	2.8	[1]
Balance at End of Period	$ 5.6		$ 6.2		$ 5.7

[1] Deductions include amounts deemed to reduce exposure of probable losses, amounts deemed uncollectible, and amounts related to fluctuations in the foreign currency exchange rate.

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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2013

Reinsurance Disclosures [Abstract]

Reinsurance Premiums for Insurance Companies by Product Segment Table [Text Block]

Reinsurance data is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Direct Premium Income	$	7,777.3		$	7,736.0		$	7,521.5
Reinsurance Assumed	203.2			210.9			216.6
Reinsurance Ceded	(355.8		)	(230.8		)	(223.9		)
Net Premium Income	$	7,624.7		$	7,716.1		$	7,514.2
Ceded Benefits and Change in Reserves for Future Benefits	$	728.7		$	591.7		$	609.2

XML

Schedule IV Reinsurance

12 Months Ended

Dec. 31, 2013

Schedule IV - Reinsurance [Abstract]

Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]

SCHEDULE IV--REINSURANCE

Unum Group and Subsidiaries

	Gross Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage Amount Assumed to Net
	(in millions of dollars)
Year Ended December 31, 2013
Life Insurance in Force	$	781,495.9	$	25,904.7	$	1,026.2	$	756,617.4	0.1	%
Premium Income:
Life Insurance	$	2,018.7	$	253.6	$	10.0	$	1,775.1	0.6	%
Accident, Health, and Other Insurance	5,758.6		102.2		193.2		5,849.6		3.3	%
Total	$	7,777.3	$	355.8	$	203.2	$	7,624.7	2.7	%
Year Ended December 31, 2012
Life Insurance in Force	$	832,587.5	$	28,658.7	$	1,073.8	$	805,002.6	0.1	%
Premium Income:
Life Insurance	$	1,979.1	$	141.4	$	10.3	$	1,848.0	0.6	%
Accident, Health, and Other Insurance	5,756.9		89.4		200.6		5,868.1		3.4	%
Total	$	7,736.0	$	230.8	$	210.9	$	7,716.1	2.7	%
Year Ended December 31, 2011
Life Insurance in Force	$	782,935.6	$	28,341.1	$	1,141.6	$	755,736.1	0.2	%
Premium Income:
Life Insurance	$	1,868.8	$	146.6	$	10.9	$	1,733.1	0.6	%
Accident, Health, and Other Insurance	5,652.7		77.3		205.7		5,781.1		3.6	%
Total	$	7,521.5	$	223.9	$	216.6	$	7,514.2	2.9	%

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Schedule III Supplementary Insurance Information

12 Months Ended

Dec. 31, 2013

Schedule III - Supplementary Insurance Info [Abstract]

Supplementary Insurance Information, for Insurance Companies Disclosure [Text Block]

SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION

Unum Group and Subsidiaries

Segment	Deferred Acquisition Costs		Reserves for Future Policy Contract Benefits		Unearned Premiums		Policy and Contract Benefits
	(in millions of dollars)
December 31, 2013
Unum US	$	1,051.5	$	11,788.4	$	47.6	$	889.1
Unum UK	34.3		2,594.3		139.3		160.0
Colonial Life	743.4		1,815.6		30.0		193.7
Closed Block	—		26,900.8		196.9		268.2
Total	$	1,829.2	$	43,099.1	$	413.8	$	1,511.0
December 31, 2012
Unum US	$	1,024.3	$	12,449.3	$	46.1	$	890.3
Unum UK	38.8		2,487.1		142.9		155.7
Colonial Life	692.4		1,691.3		29.9		149.8
Closed Block	—		28,066.7		207.8		288.8
Total	$	1,755.5	$	44,694.4	$	426.7	$	1,484.6

SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION

Unum Group and Subsidiaries

(continued from preceding page)

Segment	Premium Income		Net Investment Income (1)			Benefits and Change in Reserves for Future Benefits (2)		Amortization of Deferred Acquisition Costs		All Other Expenses (3)		Premiums Written (4)
	(in millions of dollars)
December 31, 2013
Unum US	$	4,517.1	$	929.6		$	3,222.4	$	230.0	$	1,254.0	$	3,068.0
Unum UK	556.6		148.5			413.3		14.7		145.2		448.1
Colonial Life	1,232.2		145.4			667.0		174.2		271.8		1,011.8
Closed Block	1,318.8		1,272.3			2,293.0		—		282.6		1,307.0
Corporate	—		(3.7		)	—		—		180.4		—
Total	$	7,624.7	$	2,492.1		$	6,595.7	$	418.9	$	2,134.0
December 31, 2012
Unum US	$	4,456.5	$	952.3		$	3,238.6	$	196.5	$	1,251.2	$	3,045.0
Unum UK	694.6		170.8			541.4		15.7		177.1		466.3
Colonial Life	1,194.5		138.6			627.3		166.5		265.3		986.3
Closed Block	1,370.5		1,230.5			2,314.9		—		290.7		1,358.6
Corporate	—		23.0			—		—		180.7		—
Total	$	7,716.1	$	2,515.2		$	6,722.2	$	378.7	$	2,165.0
December 31, 2011
Unum US	$	4,296.0	$	951.4		$	3,113.5	$	188.1	$	1,250.5	$	2,965.8
Unum UK	687.6		189.9			493.8		15.3		178.0		480.0
Colonial Life	1,135.3		132.4			589.4		151.2		257.5		944.9
Closed Block	1,395.3		1,189.7			3,012.8		11.1		496.4		1,385.1
Corporate	—		56.2			—		—		187.1		—
Total	$	7,514.2	$	2,519.6		$	7,209.5	$	365.7	$	2,369.5

(1) Net investment income is allocated based upon segmentation. Each segment has its own specifically identified assets and receives the investment income generated by those assets.

(2) Included in 2013 are unclaimed death benefits reserve increases of $75.4 million in Unum US and $20.1 million in Colonial Life and a group life waiver of premium benefit reserve reduction of $85.0 million in Unum US. Included in 2011 in the Closed Block segment is a reserve charge of $573.6 million related to our long-term care business and a reserve charge of $183.5 million related to our individual disability business.

(3) Includes commissions, interest and debt expense, deferral of acquisition costs, compensation expense, non-operating retirement related loss, and other expenses. Where not directly attributable to a segment, expenses are generally allocated based on activity levels, time information, and usage statistics. Included in 2011 in the Closed Block segment is an impairment charge of $196.0 million related to long-term care deferred policy acquisition costs.

(4) Excludes life insurance.

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Employee Benefit Plans OPEB Changes in Assets Measured at Fair Value Using Signficant Unobservable Inputs (Details) (Defined Benefit Postretirement Life Insurance [Member], Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Postretirement Life Insurance [Member] | Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 11.4	$ 11.5	$ 11.7
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.2	0.3
Defined Benefit Plan, Contributions by Plan Participants	15.6	16.2
Defined Benefit Plan, Benefits Paid	$ (15.9)	$ (16.7)

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Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
States, Municipalities, and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	$ (128.7)	$ (68.1)
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	(13.1)	(0.3)
Purchases	0	18.4
Sales	(1.0)	(0.7)
Level 3 Transfers Into	60.5	43.2
Level 3 Transfers Out of	0	0
End of Period	(175.1)	(128.7)
Foreign Governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(82.1)	0
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	(3.6)	5.0
Purchases	0	15.4
Sales	0	0
Level 3 Transfers Into	0	61.7
Level 3 Transfers Out of	0	0
End of Period	(78.5)	(82.1)
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(574.4)	(338.9)
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	(10.8)	22.3
Purchases	0	47.9
Sales	(3.1)	(4.2)
Level 3 Transfers Into	151.8	481.4
Level 3 Transfers Out of	(508.8)	(311.9)
End of Period	(203.5)	(574.4)
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(0.5)	(31.7)
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	0.1	0
Purchases	0	0
Sales	(0.1)	(0.1)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	(31.1)
End of Period	(0.5)	(0.5)
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(1,177.8)	(665.5)
Investment Gain (Loss) included in Earnings	1.1	1.2
Investment Gain (Loss) included in OCI	(147.1)	40.8
Purchases	186.7	151.6
Sales	(122.0)	(67.5)
Level 3 Transfers Into	1,462.0	599.8
Level 3 Transfers Out of	(699.4)	(213.6)
End of Period	(1,859.1)	(1,177.8)
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(24.8)	(37.2)
Investment Gain (Loss) included in Earnings	0	(1.0)
Investment Gain (Loss) included in OCI	(1.0)	2.9
Purchases	0	0
Sales	0	(14.3)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
End of Period	(23.8)	(24.8)
Fixed Maturity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(1,988.3)	(1,141.4)
Investment Gain (Loss) included in Earnings	1.1	0.2
Investment Gain (Loss) included in OCI	(175.5)	70.7
Purchases	186.7	233.3
Sales	(126.2)	(86.8)
Level 3 Transfers Into	1,674.3	1,186.1
Level 3 Transfers Out of	(1,208.2)	(556.6)
End of Period	(2,340.5)	(1,988.3)
Equity Securites
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(4.3)	(11.2)
Investment Gain (Loss) included in Earnings	0	(0.1)
Investment Gain (Loss) included in OCI	0.3	0
Purchases	0	0
Sales	0	(0.1)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	(6.7)
End of Period	(4.6)	(4.3)
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(83.9)	(135.7)
Investment Gain (Loss) included in Earnings	30.7	51.8
Investment Gain (Loss) included in OCI	0	0
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
End of Period	$ (53.2)	$ (83.9)

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income

A reconciliation of "operating revenue" to total revenue and "operating income" to income before income taxes is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Operating Revenue	$	10,347.0		$	10,459.2		$	10,282.9
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Total Revenue	$	10,353.8		$	10,515.4		$	10,278.0
Operating Income	$	1,241.8		$	1,239.7		$	1,323.2
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Non-operating Retirement-related Loss	(32.9		)	(46.4		)	(31.9		)
Unclaimed Death Benefits Reserve Increase for Unum US	(75.4		)	—			—
Unclaimed Death Benefits Reserve Increase for Colonial Life	(20.1		)	—			—
Group Life Waiver of Premium Benefit Reserve Reduction for Unum US	85.0			—			—
Deferred Acquisition Costs Impairment and Reserve Charges for Long-term Care Closed Block	—			—			(769.6		)
Reserve Charge for Individual Disability Closed Block	—			—			(183.5		)
Income Before Income Tax	$	1,205.2		$	1,249.5		$	333.3

Premium Income by Major Line of Business within Each Segment

Premium income by major line of business within each of our segments is presented as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	1,553.9	$	1,578.8	1,580.2
Group Short-term Disability	519.6		476.7		455.2
Group Life and Accidental Death & Dismemberment
Group Life	1,213.9		1,182.1		1,106.7
Accidental Death & Dismemberment	121.6		115.3		109.2
Supplemental and Voluntary
Individual Disability - Recently Issued	465.3		477.6		464.7
Voluntary Benefits	642.8		626.0		580.0
	4,517.1		4,456.5		4,296.0
Unum UK
Group Long-term Disability	389.9		409.7		419.6
Group Life	106.4		221.3		203.6
Supplemental	60.3		63.6		64.4
	556.6		694.6		687.6
Colonial Life
Accident, Sickness, and Disability	738.7		724.5		695.3
Life	221.1		209.7		190.7
Cancer and Critical Illness	272.4		260.3		249.3
	1,232.2		1,194.5		1,135.3
Closed Block
Individual Disability	687.5		736.4		787.0
Long-term Care	630.6		631.9		608.1
All Other	0.7		2.2		0.2
	1,318.8		1,370.5		1,395.3
Total	$	7,624.7	$	7,716.1	$	7,514.2

Selected Operating Statement Data by Segment

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Year Ended December 31, 2013
Premium Income	$	4,517.1	$	556.6	$	1,232.2	$	1,318.8	$	—		$	7,624.7
Net Investment Income	929.6		148.5		145.4		1,272.3		(3.7		)	2,492.1
Other Income	128.3		0.1		0.2		93.9		7.7			230.2
Operating Revenue	$	5,575.0	$	705.2	$	1,377.8	$	2,685.0	$	4.0		$	10,347.0
Operating Income (Loss)	$	859.0	$	132.0	$	284.9	$	109.4	$	(143.5	)	$	1,241.8
Interest and Debt Expense	$	0.1	$	—	$	—	$	8.4	$	140.9		$	149.4
Depreciation and Amortization	$	292.5	$	22.5	$	188.7	$	5.2	$	0.9		$	509.8
Year Ended December 31, 2012
Premium Income	$	4,456.5	$	694.6	$	1,194.5	$	1,370.5	$	—		$	7,716.1
Net Investment Income	952.3		170.8		138.6		1,230.5		23.0			2,515.2
Other Income	124.6		0.1		0.3		100.1		2.8			227.9
Operating Revenue	$	5,533.4	$	865.5	$	1,333.4	$	2,701.1	$	25.8		$	10,459.2
Operating Income (Loss)	$	847.1	$	131.3	$	274.3	$	95.5	$	(108.5	)	$	1,239.7
Interest and Debt Expense	$	1.1	$	—	$	—	$	10.4	$	133.9		$	145.4
Depreciation and Amortization	$	255.6	$	27.2	$	181.0	$	3.9	$	0.8		$	468.5
Year Ended December 31, 2011
Premium Income	$	4,296.0	$	687.6	$	1,135.3	$	1,395.3	$	—		$	7,514.2
Net Investment Income	951.4		189.9		132.4		1,189.7		56.2			2,519.6
Other Income	121.6		0.3		0.5		106.1		20.6			249.1
Operating Revenue	$	5,369.0	$	877.8	$	1,268.2	$	2,691.1	$	76.8		$	10,282.9
Operating Income (Loss)	$	816.9	$	190.7	$	270.1	$	123.9	$	(78.4	)	$	1,323.2
Interest and Debt Expense	$	1.0	$	—	$	—	$	10.5	$	131.8		$	143.3
Depreciation and Amortization	$	245.9	$	26.8	$	164.6	$	16.9	$	0.8		$	455.0

Deferred Policy Acquisition Costs [Text Block]

The following table provides the changes in deferred acquisition costs by segment:

							Colonial			Closed
	Unum US			Unum UK			Life			Block			Total
	(in millions of dollars)
Year Ended December 31, 2013
Beginning of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Capitalized	252.0			9.8			205.0			—			466.8
Amortization	(230.0		)	(14.7		)	(174.2		)	—			(418.9		)
Adjustment Related to Unrealized Investment Gains/Losses	5.2			—			20.2			—			25.4
Foreign Currency	—			0.4			—			—			0.4
End of Year	$	1,051.5		$	34.3		$	743.4		$	—		$	1,829.2
Year Ended December 31, 2012
Beginning of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1
Capitalized	249.2			11.8			206.3			—			467.3
Amortization	(196.5		)	(15.7		)	(166.5		)	—			(378.7		)
Adjustment Related to Unrealized Investment Gains/Losses	(0.2		)	—			(11.8		)	—			(12.0		)
Foreign Currency	—			1.8			—			—			1.8
End of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Year Ended December 31, 2011
Beginning of Year	$	943.7		$	41.0		$	628.0		$	203.4		$	1,816.1
Capitalized	220.3			15.4			203.1			3.7			442.5
Amortization	(188.1		)	(15.3		)	(151.2		)	(11.1		)	(365.7		)
Impairment of Long-term Care Deferred Acquisition Costs	—			—			—			(196.0		)	(196.0		)
Adjustment Related to Unrealized Investment Gains/Losses	(4.1		)	—			(15.5		)	—			(19.6		)
Foreign Currency	—			(0.2		)	—			—			(0.2		)
End of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1

Assets by Segment

Assets by segment are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,384.3	$	19,391.2
Unum UK	3,654.1		3,975.8
Colonial Life	3,482.9		3,434.9
Closed Block	31,564.2		33,069.2
Corporate	2,318.1		2,365.0
Total	$	59,403.6	$	62,236.1

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Schedule V Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2013

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

SCHEDULE V--VALUATION AND QUALIFYING ACCOUNTS

Unum Group and Subsidiaries

Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Additions Charged to Other Accounts		Deductions (1)		Balance at End of Period
	(in millions of dollars)
Year Ended December 31, 2013
Real estate reserve (deducted from other long-term investments)	$	0.3	$	1.5	$	—	$	—	$	1.8
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	6.2	$	0.7	$	—	$	1.3	$	5.6
Year Ended December 31, 2012
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	5.7	$	0.9	$	—	$	0.4	$	6.2
Year Ended December 31, 2011
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	7.2	$	1.3	$	—	$	2.8	$	5.7

(1) Deductions include amounts deemed to reduce exposure of probable losses, amounts deemed uncollectible, and amounts related to fluctuations in the foreign currency exchange rate.

See Note 3 of the “Notes to Consolidated Financial Statements" contained herein in Item 8 for discussion of the mortgage loan valuation allowance.

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Signficant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Significant Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation: The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). Such accounting principles differ from statutory accounting principles (see Note 15). Intercompany transactions have been eliminated.

Business Description and Basis of Presentation [Text Block]

Description of Business: We are the largest provider of group and individual disability products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including life insurance, employer- and employee-paid group benefits, and other related services. We market our products primarily to employers interested in providing benefits to their employees.

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other reporting segments are Closed Block and Corporate. See Note 13 for further discussion of our operating segments.

Use of Estimates

Use of Estimates: The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.

Fixed Maturity Securities

Fixed Maturity Securities: Fixed maturity securities include long-term bonds and redeemable preferred stocks. Fixed maturity securities not bought and held for the purpose of selling in the near term but for which we do not have the positive intent and ability to hold to maturity are classified as available-for-sale and reported at fair value. Changes in the fair value of available-for-sale fixed maturity securities, except for amounts related to other-than-temporary impairment losses recognized in earnings, are reported as a component of other comprehensive income. These amounts are net of income tax and valuation adjustments to deferred acquisition costs and reserves for future policy and contract benefits which would have been recorded had the related unrealized gain or loss on these securities been realized.

Interest income is recorded as part of net investment income when earned, using an effective yield method giving effect to amortization of premium and accretion of discount. Included within fixed maturity securities are mortgage-backed and asset-backed securities.  We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income. For fixed maturity securities on which collection of investment income is uncertain, we discontinue the accrual of investment income and recognize investment income when interest and dividends are received. Payment terms specified for fixed maturity securities may include a prepayment penalty for unscheduled payoff of the investment.  Prepayment penalties are recognized as investment income when received.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate available information, both positive and negative, in reaching our conclusions. In particular, we consider the strength of the issuer's balance sheet, its debt obligations and near-term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income. See Notes 2 and 3.

Mortgage Loans

Mortgage Loans: Mortgage loans are generally held for investment and are carried at amortized cost less an allowance for probable losses. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Prepayment penalties are recognized as investment income when received. For mortgage loans on which collection of interest income is uncertain, we discontinue the accrual of interest and recognize it in the period when an interest payment is received. We typically do not resume the accrual of interest on mortgage loans on nonaccrual status until there are significant improvements in the underlying financial condition of the borrower. We consider a loan to be delinquent if full payment is not received in accordance with the contractual terms of the loan.

We evaluate each of our mortgage loans individually for impairment based on a comprehensive rating system used to evaluate the credit risk of the loan. Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining impairment. If we determine that it is probable we will be unable to collect all amounts due under the contractual terms of a mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. We do not purchase mortgage loans with existing credit impairments. See Note 3.

Policy Loans

Policy Loans:Policy loansare presented at unpaid balances directly related to policyholders. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Included in policy loans are $3,043.7 million and $2,912.7 million of policy loans ceded to reinsurers at December 31, 2013 and 2012, respectively.

Investment, Policy [Policy Text Block]

Other Long-term Investments:Other long-term investments are comprised primarily of tax credit partnerships and private equity partnerships.

Tax credit partnerships in which we have invested were formed for the purpose of investing in the construction and rehabilitation of low-income housing.  Because the partnerships are structured such that there is no return of principal, the primary sources of investment return from our tax credit partnerships are tax credits and tax benefits derived from passive losses on the investments, both of which may exhibit variability over the life of the investment.  These partnerships are accounted for using either the equity or the effective yield method, depending primarily on whether the tax credits are guaranteed through a letter of credit, a tax indemnity agreement, or another similar arrangement. Tax credits received from these partnerships are reported in our consolidated statements of income as either a reduction of state premium taxes, which are a component of other expenses, or a reduction of income tax. For those partnerships accounted for under the equity method, the amortization of the principal amount invested in these partnerships is reported as a component of net investment income. For those partnerships accounted for under the effective yield method, amortization of the principal amount invested is reported as a component of income tax or other expenses.

Our investments in private equity partnerships are passive in nature.  The underlying investments held by these partnerships include both equity and debt securities and are accounted for using the equity or cost method, depending on the level of ownership and the degree of our influence over partnership operating and financial policies. For partnerships accounted for under the equity method, our portion of partnership earnings is reported as a component of net investment income in our consolidated statements of income. For those partnerships accounted for under the cost method, we record income received from partnership distributions as either a component of net investment income or net realized investment gain or loss, in accordance with the source of the funds distributed from the partnership. See Notes 2 and 3.

Short-term Investments:Short-term investments are carried at cost. Short-term investments include investments maturing within one year, such as corporate commercial paper and U.S. Treasury bills, bank term deposits, and other cash accounts and cash equivalents earning interest. See Note 2.

Cash and Bank Deposits

Cash and Bank Deposits: Cash and bank deposits include cash on hand and non-interest bearing cash and deposit accounts.

Derivative Financial Instruments

Derivative Financial Instruments: Derivative financial instruments (including certain derivative instruments embedded in other contracts) are recognized as either other long-term investments or other liabilities in our consolidated balance sheets and are reported at fair value. The accounting for a derivative depends on whether it has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. To qualify for hedge accounting, at the inception of the hedging transaction, we formally document the risk management objective and strategy for undertaking the hedging transaction, as well as the designation of the hedge as either a fair value hedge or a cash flow hedge. Included in this documentation is how the hedging instrument is expected to hedge the designated risk(s) related to specific assets or liabilities on the balance sheet or to specific forecasted transactions as well as a description of the method that will be used to retrospectively and prospectively assess the hedging instrument's effectiveness and the method that will be used to measure ineffectiveness.

A derivative designated as a hedging instrument must be assessed as being highly effective in offsetting the designated risk(s) of the hedged item. Hedge effectiveness is formally assessed at inception and periodically throughout the life of the designated hedging relationship, using qualitative and quantitative methods. Qualitative methods include comparison of critical terms of the derivative to the hedged item. Quantitative methods include regression or other statistical analysis of changes in fair value or cash flows associated with the hedge relationship.

Changes in the fair value of a derivative designated as a fair value hedge, including amounts measured as ineffectiveness, and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.  The gain or loss on the termination of a fair value hedge is recognized in earnings as a component of net realized investment gain or loss during the period in which the termination occurs. When interest rate swaps are used in hedge accounting relationships, periodic settlements are recorded in the same income statement line as the related settlements of the hedged items.

To the extent it is effective, changes in the fair value of a derivative designated as a cash flow hedge are reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings. The ineffective portion of the hedge, if any, is recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. The gain or loss on the termination of an effective cash flow hedge is reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings.

Gains or losses on the termination of ineffective fair value or cash flow hedges are reported in earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of or the anticipated transaction being hedged is no longer likely to occur, we will terminate the related derivative and recognize the gain or loss on termination in current earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of subsequent to the termination of the hedging transaction, we reclassify any remaining gain or loss on the cash flow hedge out of accumulated other comprehensive income into earnings as a component of the same income statement line item wherein we report the gain or loss on disposition of the hedged item.

For a derivative not designated as a hedging instrument, changes in the fair value of the derivative, together with the payment of periodic fees, if applicable, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

Cash flow activity from the settlement of derivative contracts is reported in the consolidated statements of cash flows as a component of proceeds from sales and maturities of other investments.

In our consolidated balance sheets, we do not offset fair value amounts recognized for derivatives executed with the same counterparty under a master netting agreement and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from those master netting agreements. See Notes 2 and 4.

Fair Value Measurement

Fair Value Measurement: Certain assets and liabilities are reported at fair value in our consolidated balance sheets and in our notes to our consolidated financial statements. We define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value represents an exit price, not an entry price. The exit price objective applies regardless of our intent and/or ability to sell the asset or transfer the liability at the measurement date. Assets or liabilities with readily available actively quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. When actively quoted prices are not available, fair values are based on quoted prices in markets that are not active, quoted prices for similar but not identical assets or liabilities, or other observable inputs. If observable inputs are not available, unobservable inputs and/or adjustments to observable inputs requiring management judgment are used to determine fair value. We categorize our assets and liabilities measured at estimated fair value into a three-level hierarchy, based on the significance of the inputs. The fair value hierarchy gives the highest priority to inputs which are unadjusted and represent quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). See Note 2.

Realized Investment Gains and Losses

Realized Investment Gains and Losses: Realized investment gains and losses are reported as a component of revenue in the consolidated statements of income and are based upon specific identification of the investments sold. See Note 3.

Deferred Acquisition Costs

Deferred Acquisition Costs: Incremental direct costs associated with the successful acquisition of new or renewal insurance contracts have been deferred. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral. Deferred acquisition costs are subject to recoverability testing at the time of policy issue and loss recognition testing in subsequent years.

Deferred acquisition costs related to traditional policies are amortized over the premium paying period of the related policies in proportion to the ratio of the present value of annual expected premium income to the present value of total expected premium income. Deferred acquisition costs related to interest-sensitive policies are amortized over the lives of the policies in relation to the present value of estimated gross profits from surrender charges, mortality margins, investment returns, and expense margins. Deviations from projections result in a change to the rate of amortization in the period during which such events occur. Generally, the amortization periods for these policies approximate the estimated lives of the policies.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. Unamortized deferred acquisition costs from the original policy continue to be amortized over the expected life of the new policy, and the costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions, principally on group contracts, that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. Unamortized deferred acquisition costs on the original policy that was replaced are immediately expensed, and the costs of acquiring the new policy are capitalized and amortized in accordance with our accounting policies for deferred acquisition costs.

Loss recognition is performed on an annual basis, or more frequently if appropriate, using best estimate assumptions as to future experience as of the date of the test. Insurance contracts are grouped for each major product line within a segment when we perform the loss recognition tests. If loss recognition testing indicates that deferred acquisition costs are not recoverable, the deficiency is charged to expense.

Goodwill

Goodwill: Goodwill is the excess of the amount paid to acquire a business over the fair value of the net assets acquired. We review the carrying amount of goodwill for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the carrying amount might not be recoverable. Goodwill impairment testing compares the fair value of a reporting unit with its carrying amount, including goodwill.  The fair values of the reporting units are determined using discounted cash flow models.  The critical estimates necessary in determining fair value are projected earnings and the discount rate.  We set our discount rate assumption based on an expected risk adjusted cost of capital.  If the fair value of the reporting unit to which the goodwill relates is less than the carrying amount of the unamortized goodwill, the carrying amount is reduced with a corresponding charge to expense.

Property and Equipment

Property and Equipment: Property and equipment is reported at cost less accumulated depreciation, which is calculated on the straight-line method over the estimated useful life. The accumulated depreciation for property and equipment was $760.8 million and $705.0 million as of December 31, 2013 and 2012, respectively

Value of Business Acquired

Value of Business Acquired: Value of business acquired represents the present value of future profits recorded in connection with the acquisition of a block of insurance policies. The asset is amortized based upon expected future premium income for traditional insurance policies and estimated future gross profits from surrender charges, mortality margins, investment returns, and expense margins for interest-sensitive insurance policies. The value of business acquired, which is included in other assets in our consolidated balance sheets, was $19.0 million and $23.5 million at December 31, 2013 and 2012, respectively. The accumulated amortization for value of business acquired was $138.2 million and $131.5 million as of December 31, 2013 and 2012, respectively.

The amortization of value of business acquired, which is included in other expenses in the consolidated statements of income, was $4.5 million, $7.5 million, and $7.4 million for the years ended December 31, 2013, 2012, and 2011, respectively. We periodically review the carrying amount of value of business acquired using the same methods used to evaluate deferred acquisition costs.

Policy and Contract Benefits

Policy and Contract Benefits: Policy and contract benefits represent amounts paid and expected to be paid based on reported losses and estimates of incurred but not reported losses for traditional life and accident and health products. For interest-sensitive products, benefits are the amounts paid and expected to be paid on insured claims in excess of the policyholders' policy fund balances

Policy and Contract Benefits Liabilities

Reserves for Policy and Contract Benefits: Policy reserves represent future policy and contract benefits for claims not yet incurred. Policy reserves for traditional life and accident and health products are determined using the net level premium method. The reserves are calculated based upon assumptions as to interest, persistency, morbidity, and mortality that were appropriate at the date of issue. Interest rate assumptions are based on actual and expected net investment returns. Persistency assumptions are based on our actual historical experience adjusted for future expectations. Morbidity and mortality assumptions are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by plan, year of issue, and policy duration and include a provision for adverse deviation.

Policy reserves for group single premium annuities have been provided on a net single premium method. The reserves are calculated based on assumptions as to interest, mortality, and retirement that were appropriate at the date of issue. Mortality assumptions are based upon industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by year of issue.

Policy reserves for interest-sensitive products are principally policyholder account values.

We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency.

Claim reserves represent future policy and contract benefits for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Our claim reserves relate primarily to disability policies and are calculated based on assumptions as to interest and claim resolution rates that are currently appropriate. Claim resolution rate assumptions are based on our actual experience. The interest rate assumptions used for discounting claim reserves are based on projected portfolio yield rates, after consideration for defaults and investment expenses, for the assets supporting the liabilities for the various product lines. Unlike policy reserves for which assumptions are generally established and locked in at the time of policy issuance, claim reserves are subject to revision as current claim experience and projections of future experience change. See Note 6.

Policyholders Funds

Policyholders' Funds: Policyholders' funds represent customer deposits plus interest credited at contract rates. We control interest rate risk by investing in quality assets which have an aggregate duration that closely matches the expected duration of the liabilities

Income Tax

Income Tax: Deferred taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial statement purposes and the amounts used for income tax purposes. Deferred taxes have been measured using enacted statutory income tax rates and laws that are currently in effect. We record deferred tax assets for tax positions taken in the U.S. and other tax jurisdictions based on our assessment of whether a position is more likely than not to be sustained upon examination based solely on its technical merits.  A valuation allowance is established for deferred tax assets when it is more likely than not that an amount will not be realized. See Note 7.

Short-term and Long-term Debt

Short-term and Long-term Debt: Debt is generally carried at the unpaid principal balance, net of unamortized discount or premium. Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements and repurchase agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty. Original issue discount or premium as well as debt issue costs are recognized as a component of interest expense over the period the debt is expected to be outstanding. The carrying amount of long-term debt that is part of a fair value hedge program includes an adjustment to reflect the effect of the change in fair value attributable to the risk being hedged. Net interest settlements for fair value hedges on our long-term debt are recognized as a component of interest expense. See Note 8.

Treasury Shares and Retirement of Common Stock

Treasury Stock and Retirement of Common Stock: Treasury stock is reflected as a reduction of stockholders' equity at cost. When shares are retired, the par value is removed from common stock, and the excess of the repurchase price over par is allocated between additional paid-in capital and retained earnings.

Revenue Recognition

Revenue Recognition: Traditional life and accident and health products are long-duration contracts, and premium income is recognized as revenue when due from policyholders. If the contracts are experience rated, the estimated ultimate premium is recognized as revenue over the period of the contract. The estimated ultimate premium, which is revised to reflect current experience, is based on estimated claim costs, expenses, and profit margins.

For interest-sensitive products, the amounts collected from policyholders are considered deposits, and only the deductions during the period for cost of insurance, policy administration, and surrenders are included in revenue. Policyholders' funds represent funds deposited by contract holders and are not included in revenue.

Revenue Recognition, Sales of Services [Policy Text Block]

Fees from our administrative-services only and family medical leave products are reported as other income when services are rendered.

Reinsurance

Reinsurance: We routinely enter into reinsurance agreements with other insurance companies to spread risk and thereby limit losses from large exposures. For each of our reinsurance agreements, we determine if the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. If we determine that a reinsurance agreement does not expose the reinsurer to a reasonable possibility of a significant loss from insurance risk, we record the agreement using the deposit method of accounting.  

Reinsurance activity is accounted for on a basis consistent with the terms of the reinsurance contracts and the accounting used for the original policies issued. Premium income and benefits and change in reserves for future benefits are presented in our consolidated statements of income net of reinsurance ceded. Ceded liabilities for policy and contract benefits, future policy and contract benefits, and unearned premiums are reported on a gross basis in our consolidated balance sheets, as are ceded policy loans. Our reinsurance recoverable includes the balances due from reinsurers under the terms of the reinsurance agreements for these ceded balances as well as settlement amounts currently due.

Where applicable, gains or losses on reinsurance transactions are deferred and amortized into earnings based upon expected future premium income for traditional insurance policies and estimated future gross profits for interest-sensitive insurance policies. The deferred gain on reinsurance included in other liabilities in our consolidated balance sheets at December 31, 2013 and 2012 was $53.6 million and $67.4 million, respectively.

Under ceded reinsurance agreements wherein we are not relieved of our legal liability to our policyholders, if the assuming reinsurer is unable to meet its obligations, we remain contingently liable. We evaluate the financial condition of reinsurers and monitor concentration of credit risk to minimize this exposure. We may also require assets in trust, letters of credit, or other acceptable collateral to support our reinsurance recoverable balances. In the event that reinsurers do not meet their obligations to us under the terms of the reinsurance agreements, certain amounts reported in our reinsurance recoverable could become uncollectible, in which case the reinsurance recoverable balances are stated net of allowances for uncollectible reinsurance. See Note 12.

Premium Tax Expense

Premium Tax Expense: Premium tax expense is included in other expenses in the consolidated statements of income. For the years ended December 31, 2013, 2012, and 2011, premium tax expense was $137.0 million, $136.0 million, and $134.9 million, respectively

Stock-Based Compensation

Stock-Based Compensation: The cost of stock-based compensation is generally measured based on the grant-date fair value of the award. The Black-Scholes options valuation model is used for estimating the fair value of stock options, and the Monte-Carlo valuation model is used for estimating the fair value of performance share units. Restricted stock units are valued based on the fair value of common stock at the grant date, and cash-settled awards are measured each reporting period based on the current stock price. Stock-based awards are expensed over the requisite service period, with an offsetting increase to additional paid-in capital in stockholders' equity. See Note 11.

Earnings Per Share

Earnings Per Share: We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. Earnings per share assuming dilution is computed by dividing net income by the weighted average number of shares outstanding for the period plus the shares representing the dilutive effect of stock-based awards. In computing earnings per share assuming dilution, only potential common shares resulting from stock-based awards that are dilutive (those that reduce earnings per share) are included. We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards on the computation of earnings per share assuming dilution. See Note 10.

Translation of Foreign Curency

Translation of Foreign Currency: Revenues and expenses of our foreign operations are translated at average exchange rates. Assets and liabilities are translated at the rate of exchange on the balance sheet dates. The translation gain or loss is generally reported in accumulated other comprehensive income, net of deferred tax. We do not provide for deferred taxes to the extent unremitted foreign earnings are deemed permanently invested

Accounting for Participating Individual Life Insurance

Accounting for Participating Individual Life Insurance: Participating policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual to a stock life insurance company will remain participating as long as the policies remain in-force. A Participation Fund Account (PFA) was established for the benefit of all such individual participating life and annuity policies and contracts. The assets of the PFA provide for the benefit, dividend, and certain expense obligations of the participating individual life insurance policies and annuity contracts. The assets of the PFA were $339.2 million and $380.4 million at December 31, 2013 and 2012, respectively.

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 815 "Derivatives and Hedging"

In July 2013, the FASB issued an update which allows entities to use the Fed Funds Effective Swap Rate, also referred to as the Overnight Index Swap Rate (OIS), as a benchmark interest rate for hedge accounting purposes. Previously the only acceptable benchmark rates for hedge accounting purposes under GAAP were U.S. Treasury rates and the London Interbank Offered Rate (LIBOR) swap rate. This update reflects the evolution of market hedging practices and is intended to provide more flexibility in hedging interest rate risk. We adopted this update effective July 17, 2013 for qualifying new or redesignated hedging relationships entered into on or after that date.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the FASB issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. We adopted this update effective January 1, 2012. The adoption of this update modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods in our consolidated financial statements and accompanying notes.

Accounting Updates Adopted in 2011:

ASC 310 "Receivables"

In April 2011, the FASB issued an update to provide additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted this update effective July 1, 2011. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 323 "Investments - Equity Method and Joint Ventures"

In January 2014, the FASB issued an update to provide guidance on the accounting and reporting for investments in affordable housing projects that qualify for low-income housing tax credits. The amendments in the update permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Additional disclosures concerning investments in qualified affordable housing projects will also be required by the update. The amendments in the update are effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted, and are to be applied retrospectively. We have not yet finalized the expected impact on our financial position or results of operations.

Significant Accounting Policies [Text Block]

Basis of Presentation: The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). Such accounting principles differ from statutory accounting principles (see Note 15). Intercompany transactions have been eliminated.

Description of Business: We are the largest provider of group and individual disability products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including life insurance, employer- and employee-paid group benefits, and other related services. We market our products primarily to employers interested in providing benefits to their employees.

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other reporting segments are Closed Block and Corporate. See Note 13 for further discussion of our operating segments.

Use of Estimates: The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.

Fixed Maturity Securities: Fixed maturity securities include long-term bonds and redeemable preferred stocks. Fixed maturity securities not bought and held for the purpose of selling in the near term but for which we do not have the positive intent and ability to hold to maturity are classified as available-for-sale and reported at fair value. Changes in the fair value of available-for-sale fixed maturity securities, except for amounts related to other-than-temporary impairment losses recognized in earnings, are reported as a component of other comprehensive income. These amounts are net of income tax and valuation adjustments to deferred acquisition costs and reserves for future policy and contract benefits which would have been recorded had the related unrealized gain or loss on these securities been realized.

Interest income is recorded as part of net investment income when earned, using an effective yield method giving effect to amortization of premium and accretion of discount. Included within fixed maturity securities are mortgage-backed and asset-backed securities.  We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income. For fixed maturity securities on which collection of investment income is uncertain, we discontinue the accrual of investment income and recognize investment income when interest and dividends are received. Payment terms specified for fixed maturity securities may include a prepayment penalty for unscheduled payoff of the investment.  Prepayment penalties are recognized as investment income when received.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate available information, both positive and negative, in reaching our conclusions. In particular, we consider the strength of the issuer's balance sheet, its debt obligations and near-term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income. See Notes 2 and 3.

Mortgage Loans: Mortgage loans are generally held for investment and are carried at amortized cost less an allowance for probable losses. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Prepayment penalties are recognized as investment income when received. For mortgage loans on which collection of interest income is uncertain, we discontinue the accrual of interest and recognize it in the period when an interest payment is received. We typically do not resume the accrual of interest on mortgage loans on nonaccrual status until there are significant improvements in the underlying financial condition of the borrower. We consider a loan to be delinquent if full payment is not received in accordance with the contractual terms of the loan.

We evaluate each of our mortgage loans individually for impairment based on a comprehensive rating system used to evaluate the credit risk of the loan. Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining impairment. If we determine that it is probable we will be unable to collect all amounts due under the contractual terms of a mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. We do not purchase mortgage loans with existing credit impairments. See Note 3.

Policy Loans:Policy loansare presented at unpaid balances directly related to policyholders. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Included in policy loans are $3,043.7 million and $2,912.7 million of policy loans ceded to reinsurers at December 31, 2013 and 2012, respectively.

Other Long-term Investments:Other long-term investments are comprised primarily of tax credit partnerships and private equity partnerships.

Tax credit partnerships in which we have invested were formed for the purpose of investing in the construction and rehabilitation of low-income housing.  Because the partnerships are structured such that there is no return of principal, the primary sources of investment return from our tax credit partnerships are tax credits and tax benefits derived from passive losses on the investments, both of which may exhibit variability over the life of the investment.  These partnerships are accounted for using either the equity or the effective yield method, depending primarily on whether the tax credits are guaranteed through a letter of credit, a tax indemnity agreement, or another similar arrangement. Tax credits received from these partnerships are reported in our consolidated statements of income as either a reduction of state premium taxes, which are a component of other expenses, or a reduction of income tax. For those partnerships accounted for under the equity method, the amortization of the principal amount invested in these partnerships is reported as a component of net investment income. For those partnerships accounted for under the effective yield method, amortization of the principal amount invested is reported as a component of income tax or other expenses.

Our investments in private equity partnerships are passive in nature.  The underlying investments held by these partnerships include both equity and debt securities and are accounted for using the equity or cost method, depending on the level of ownership and the degree of our influence over partnership operating and financial policies. For partnerships accounted for under the equity method, our portion of partnership earnings is reported as a component of net investment income in our consolidated statements of income. For those partnerships accounted for under the cost method, we record income received from partnership distributions as either a component of net investment income or net realized investment gain or loss, in accordance with the source of the funds distributed from the partnership. See Notes 2 and 3.

Short-term Investments:Short-term investments are carried at cost. Short-term investments include investments maturing within one year, such as corporate commercial paper and U.S. Treasury bills, bank term deposits, and other cash accounts and cash equivalents earning interest. See Note 2.

Cash and Bank Deposits: Cash and bank deposits include cash on hand and non-interest bearing cash and deposit accounts.

Derivative Financial Instruments: Derivative financial instruments (including certain derivative instruments embedded in other contracts) are recognized as either other long-term investments or other liabilities in our consolidated balance sheets and are reported at fair value. The accounting for a derivative depends on whether it has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. To qualify for hedge accounting, at the inception of the hedging transaction, we formally document the risk management objective and strategy for undertaking the hedging transaction, as well as the designation of the hedge as either a fair value hedge or a cash flow hedge. Included in this documentation is how the hedging instrument is expected to hedge the designated risk(s) related to specific assets or liabilities on the balance sheet or to specific forecasted transactions as well as a description of the method that will be used to retrospectively and prospectively assess the hedging instrument's effectiveness and the method that will be used to measure ineffectiveness.

A derivative designated as a hedging instrument must be assessed as being highly effective in offsetting the designated risk(s) of the hedged item. Hedge effectiveness is formally assessed at inception and periodically throughout the life of the designated hedging relationship, using qualitative and quantitative methods. Qualitative methods include comparison of critical terms of the derivative to the hedged item. Quantitative methods include regression or other statistical analysis of changes in fair value or cash flows associated with the hedge relationship.

Changes in the fair value of a derivative designated as a fair value hedge, including amounts measured as ineffectiveness, and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.  The gain or loss on the termination of a fair value hedge is recognized in earnings as a component of net realized investment gain or loss during the period in which the termination occurs. When interest rate swaps are used in hedge accounting relationships, periodic settlements are recorded in the same income statement line as the related settlements of the hedged items.

To the extent it is effective, changes in the fair value of a derivative designated as a cash flow hedge are reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings. The ineffective portion of the hedge, if any, is recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. The gain or loss on the termination of an effective cash flow hedge is reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings.

Gains or losses on the termination of ineffective fair value or cash flow hedges are reported in earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of or the anticipated transaction being hedged is no longer likely to occur, we will terminate the related derivative and recognize the gain or loss on termination in current earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of subsequent to the termination of the hedging transaction, we reclassify any remaining gain or loss on the cash flow hedge out of accumulated other comprehensive income into earnings as a component of the same income statement line item wherein we report the gain or loss on disposition of the hedged item.

For a derivative not designated as a hedging instrument, changes in the fair value of the derivative, together with the payment of periodic fees, if applicable, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

Cash flow activity from the settlement of derivative contracts is reported in the consolidated statements of cash flows as a component of proceeds from sales and maturities of other investments.

In our consolidated balance sheets, we do not offset fair value amounts recognized for derivatives executed with the same counterparty under a master netting agreement and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from those master netting agreements. See Notes 2 and 4.

Fair Value Measurement: Certain assets and liabilities are reported at fair value in our consolidated balance sheets and in our notes to our consolidated financial statements. We define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value represents an exit price, not an entry price. The exit price objective applies regardless of our intent and/or ability to sell the asset or transfer the liability at the measurement date. Assets or liabilities with readily available actively quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. When actively quoted prices are not available, fair values are based on quoted prices in markets that are not active, quoted prices for similar but not identical assets or liabilities, or other observable inputs. If observable inputs are not available, unobservable inputs and/or adjustments to observable inputs requiring management judgment are used to determine fair value. We categorize our assets and liabilities measured at estimated fair value into a three-level hierarchy, based on the significance of the inputs. The fair value hierarchy gives the highest priority to inputs which are unadjusted and represent quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). See Note 2.

Realized Investment Gains and Losses: Realized investment gains and losses are reported as a component of revenue in the consolidated statements of income and are based upon specific identification of the investments sold. See Note 3.

Deferred Acquisition Costs: Incremental direct costs associated with the successful acquisition of new or renewal insurance contracts have been deferred. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral. Deferred acquisition costs are subject to recoverability testing at the time of policy issue and loss recognition testing in subsequent years.

Deferred acquisition costs related to traditional policies are amortized over the premium paying period of the related policies in proportion to the ratio of the present value of annual expected premium income to the present value of total expected premium income. Deferred acquisition costs related to interest-sensitive policies are amortized over the lives of the policies in relation to the present value of estimated gross profits from surrender charges, mortality margins, investment returns, and expense margins. Deviations from projections result in a change to the rate of amortization in the period during which such events occur. Generally, the amortization periods for these policies approximate the estimated lives of the policies.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. Unamortized deferred acquisition costs from the original policy continue to be amortized over the expected life of the new policy, and the costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions, principally on group contracts, that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. Unamortized deferred acquisition costs on the original policy that was replaced are immediately expensed, and the costs of acquiring the new policy are capitalized and amortized in accordance with our accounting policies for deferred acquisition costs.

Loss recognition is performed on an annual basis, or more frequently if appropriate, using best estimate assumptions as to future experience as of the date of the test. Insurance contracts are grouped for each major product line within a segment when we perform the loss recognition tests. If loss recognition testing indicates that deferred acquisition costs are not recoverable, the deficiency is charged to expense.

Goodwill: Goodwill is the excess of the amount paid to acquire a business over the fair value of the net assets acquired. We review the carrying amount of goodwill for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the carrying amount might not be recoverable. Goodwill impairment testing compares the fair value of a reporting unit with its carrying amount, including goodwill.  The fair values of the reporting units are determined using discounted cash flow models.  The critical estimates necessary in determining fair value are projected earnings and the discount rate.  We set our discount rate assumption based on an expected risk adjusted cost of capital.  If the fair value of the reporting unit to which the goodwill relates is less than the carrying amount of the unamortized goodwill, the carrying amount is reduced with a corresponding charge to expense. 

Property and Equipment: Property and equipment is reported at cost less accumulated depreciation, which is calculated on the straight-line method over the estimated useful life. The accumulated depreciation for property and equipment was $760.8 million and $705.0 million as of December 31, 2013 and 2012, respectively.

Value of Business Acquired: Value of business acquired represents the present value of future profits recorded in connection with the acquisition of a block of insurance policies. The asset is amortized based upon expected future premium income for traditional insurance policies and estimated future gross profits from surrender charges, mortality margins, investment returns, and expense margins for interest-sensitive insurance policies. The value of business acquired, which is included in other assets in our consolidated balance sheets, was $19.0 million and $23.5 million at December 31, 2013 and 2012, respectively. The accumulated amortization for value of business acquired was $138.2 million and $131.5 million as of December 31, 2013 and 2012, respectively.

The amortization of value of business acquired, which is included in other expenses in the consolidated statements of income, was $4.5 million, $7.5 million, and $7.4 million for the years ended December 31, 2013, 2012, and 2011, respectively. We periodically review the carrying amount of value of business acquired using the same methods used to evaluate deferred acquisition costs.

Policy and Contract Benefits: Policy and contract benefits represent amounts paid and expected to be paid based on reported losses and estimates of incurred but not reported losses for traditional life and accident and health products. For interest-sensitive products, benefits are the amounts paid and expected to be paid on insured claims in excess of the policyholders' policy fund balances.

Reserves for Policy and Contract Benefits: Policy reserves represent future policy and contract benefits for claims not yet incurred. Policy reserves for traditional life and accident and health products are determined using the net level premium method. The reserves are calculated based upon assumptions as to interest, persistency, morbidity, and mortality that were appropriate at the date of issue. Interest rate assumptions are based on actual and expected net investment returns. Persistency assumptions are based on our actual historical experience adjusted for future expectations. Morbidity and mortality assumptions are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by plan, year of issue, and policy duration and include a provision for adverse deviation.

Policy reserves for group single premium annuities have been provided on a net single premium method. The reserves are calculated based on assumptions as to interest, mortality, and retirement that were appropriate at the date of issue. Mortality assumptions are based upon industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by year of issue.

Policy reserves for interest-sensitive products are principally policyholder account values.

We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency.

Claim reserves represent future policy and contract benefits for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Our claim reserves relate primarily to disability policies and are calculated based on assumptions as to interest and claim resolution rates that are currently appropriate. Claim resolution rate assumptions are based on our actual experience. The interest rate assumptions used for discounting claim reserves are based on projected portfolio yield rates, after consideration for defaults and investment expenses, for the assets supporting the liabilities for the various product lines. Unlike policy reserves for which assumptions are generally established and locked in at the time of policy issuance, claim reserves are subject to revision as current claim experience and projections of future experience change. See Note 6.

Policyholders' Funds: Policyholders' funds represent customer deposits plus interest credited at contract rates. We control interest rate risk by investing in quality assets which have an aggregate duration that closely matches the expected duration of the liabilities.

Income Tax: Deferred taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial statement purposes and the amounts used for income tax purposes. Deferred taxes have been measured using enacted statutory income tax rates and laws that are currently in effect. We record deferred tax assets for tax positions taken in the U.S. and other tax jurisdictions based on our assessment of whether a position is more likely than not to be sustained upon examination based solely on its technical merits.  A valuation allowance is established for deferred tax assets when it is more likely than not that an amount will not be realized. See Note 7.

Short-term and Long-term Debt: Debt is generally carried at the unpaid principal balance, net of unamortized discount or premium. Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements and repurchase agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty. Original issue discount or premium as well as debt issue costs are recognized as a component of interest expense over the period the debt is expected to be outstanding. The carrying amount of long-term debt that is part of a fair value hedge program includes an adjustment to reflect the effect of the change in fair value attributable to the risk being hedged. Net interest settlements for fair value hedges on our long-term debt are recognized as a component of interest expense. See Note 8.

Treasury Stock and Retirement of Common Stock: Treasury stock is reflected as a reduction of stockholders' equity at cost. When shares are retired, the par value is removed from common stock, and the excess of the repurchase price over par is allocated between additional paid-in capital and retained earnings.

Revenue Recognition: Traditional life and accident and health products are long-duration contracts, and premium income is recognized as revenue when due from policyholders. If the contracts are experience rated, the estimated ultimate premium is recognized as revenue over the period of the contract. The estimated ultimate premium, which is revised to reflect current experience, is based on estimated claim costs, expenses, and profit margins.

For interest-sensitive products, the amounts collected from policyholders are considered deposits, and only the deductions during the period for cost of insurance, policy administration, and surrenders are included in revenue. Policyholders' funds represent funds deposited by contract holders and are not included in revenue.

Fees from our administrative-services only and family medical leave products are reported as other income when services are rendered.

Reinsurance: We routinely enter into reinsurance agreements with other insurance companies to spread risk and thereby limit losses from large exposures. For each of our reinsurance agreements, we determine if the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. If we determine that a reinsurance agreement does not expose the reinsurer to a reasonable possibility of a significant loss from insurance risk, we record the agreement using the deposit method of accounting.  

Reinsurance activity is accounted for on a basis consistent with the terms of the reinsurance contracts and the accounting used for the original policies issued. Premium income and benefits and change in reserves for future benefits are presented in our consolidated statements of income net of reinsurance ceded. Ceded liabilities for policy and contract benefits, future policy and contract benefits, and unearned premiums are reported on a gross basis in our consolidated balance sheets, as are ceded policy loans. Our reinsurance recoverable includes the balances due from reinsurers under the terms of the reinsurance agreements for these ceded balances as well as settlement amounts currently due.

Where applicable, gains or losses on reinsurance transactions are deferred and amortized into earnings based upon expected future premium income for traditional insurance policies and estimated future gross profits for interest-sensitive insurance policies. The deferred gain on reinsurance included in other liabilities in our consolidated balance sheets at December 31, 2013 and 2012 was $53.6 million and $67.4 million, respectively.

Under ceded reinsurance agreements wherein we are not relieved of our legal liability to our policyholders, if the assuming reinsurer is unable to meet its obligations, we remain contingently liable. We evaluate the financial condition of reinsurers and monitor concentration of credit risk to minimize this exposure. We may also require assets in trust, letters of credit, or other acceptable collateral to support our reinsurance recoverable balances. In the event that reinsurers do not meet their obligations to us under the terms of the reinsurance agreements, certain amounts reported in our reinsurance recoverable could become uncollectible, in which case the reinsurance recoverable balances are stated net of allowances for uncollectible reinsurance. See Note 12.

Premium Tax Expense: Premium tax expense is included in other expenses in the consolidated statements of income. For the years ended December 31, 2013, 2012, and 2011, premium tax expense was $137.0 million, $136.0 million, and $134.9 million, respectively.

Stock-Based Compensation: The cost of stock-based compensation is generally measured based on the grant-date fair value of the award. The Black-Scholes options valuation model is used for estimating the fair value of stock options, and the Monte-Carlo valuation model is used for estimating the fair value of performance share units. Restricted stock units are valued based on the fair value of common stock at the grant date, and cash-settled awards are measured each reporting period based on the current stock price. Stock-based awards are expensed over the requisite service period, with an offsetting increase to additional paid-in capital in stockholders' equity. See Note 11.

Earnings Per Share: We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. Earnings per share assuming dilution is computed by dividing net income by the weighted average number of shares outstanding for the period plus the shares representing the dilutive effect of stock-based awards. In computing earnings per share assuming dilution, only potential common shares resulting from stock-based awards that are dilutive (those that reduce earnings per share) are included. We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards on the computation of earnings per share assuming dilution. See Note 10.

Translation of Foreign Currency: Revenues and expenses of our foreign operations are translated at average exchange rates. Assets and liabilities are translated at the rate of exchange on the balance sheet dates. The translation gain or loss is generally reported in accumulated other comprehensive income, net of deferred tax. We do not provide for deferred taxes to the extent unremitted foreign earnings are deemed permanently invested.

Accounting for Participating Individual Life Insurance: Participating policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual to a stock life insurance company will remain participating as long as the policies remain in-force. A Participation Fund Account (PFA) was established for the benefit of all such individual participating life and annuity policies and contracts. The assets of the PFA provide for the benefit, dividend, and certain expense obligations of the participating individual life insurance policies and annuity contracts. The assets of the PFA were $339.2 million and $380.4 million at December 31, 2013 and 2012, respectively.

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 815 "Derivatives and Hedging"

In July 2013, the FASB issued an update which allows entities to use the Fed Funds Effective Swap Rate, also referred to as the Overnight Index Swap Rate (OIS), as a benchmark interest rate for hedge accounting purposes. Previously the only acceptable benchmark rates for hedge accounting purposes under GAAP were U.S. Treasury rates and the London Interbank Offered Rate (LIBOR) swap rate. This update reflects the evolution of market hedging practices and is intended to provide more flexibility in hedging interest rate risk. We adopted this update effective July 17, 2013 for qualifying new or redesignated hedging relationships entered into on or after that date.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the FASB issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. We adopted this update effective January 1, 2012. The adoption of this update modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods in our consolidated financial statements and accompanying notes.

Accounting Updates Adopted in 2011:

ASC 310 "Receivables"

In April 2011, the FASB issued an update to provide additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted this update effective July 1, 2011. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 323 "Investments - Equity Method and Joint Ventures"

In January 2014, the FASB issued an update to provide guidance on the accounting and reporting for investments in affordable housing projects that qualify for low-income housing tax credits. The amendments in the update permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Additional disclosures concerning investments in qualified affordable housing projects will also be required by the update. The amendments in the update are effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted, and are to be applied retrospectively. We have not yet finalized the expected impact on our financial position or results of operations.

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Retained Earnings
Dividends to Stockholders, per common share	$ 0.550	$ 0.470	$ 0.395

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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 815 "Derivatives and Hedging"

In July 2013, the FASB issued an update which allows entities to use the Fed Funds Effective Swap Rate, also referred to as the Overnight Index Swap Rate (OIS), as a benchmark interest rate for hedge accounting purposes. Previously the only acceptable benchmark rates for hedge accounting purposes under GAAP were U.S. Treasury rates and the London Interbank Offered Rate (LIBOR) swap rate. This update reflects the evolution of market hedging practices and is intended to provide more flexibility in hedging interest rate risk. We adopted this update effective July 17, 2013 for qualifying new or redesignated hedging relationships entered into on or after that date.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the FASB issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. We adopted this update effective January 1, 2012. The adoption of this update modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods in our consolidated financial statements and accompanying notes.

Accounting Updates Adopted in 2011:

ASC 310 "Receivables"

In April 2011, the FASB issued an update to provide additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted this update effective July 1, 2011. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 323 "Investments - Equity Method and Joint Ventures"

In January 2014, the FASB issued an update to provide guidance on the accounting and reporting for investments in affordable housing projects that qualify for low-income housing tax credits. The amendments in the update permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Additional disclosures concerning investments in qualified affordable housing projects will also be required by the update. The amendments in the update are effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted, and are to be applied retrospectively. We have not yet finalized the expected impact on our financial position or results of operations.

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Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Income Tax Expense (Benefit)	$ 347.1	$ 355.1	$ 49.1
Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Reclassification on Derivatives from Other Comrpehensive Income to Net Income, before Tax	23.0
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	15.0
Reclassification Out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Reclassification on Sale of Securities from Other Comprehensive Income to Net Income, before Tax	(13.4)
Reclassification on Sale of Securities from Other Comprehensive Income to Net Income, Net of Tax	(8.6)
Reclassification Out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Benefit Costs
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Reclassification of Gain (Loss) on Pension and Other Postretirement Benefit Plans from Other Comprehensive Income to Net Income, before Tax	(24.9)
Reclassification of Gain (Loss) on Pension and Other Postretirement Benefit Plans from Other Comprehensive Income to Net Income, Net of Tax	(16.0)
Net Realized Investments Gain Loss | Reclassification Out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Loss on Sales of Securities and Other Invested Assets	(12.6)
Other than Temporary Impairment Losses	(0.8)
Net Realized Investments Gain Loss | Interest Rate Swaps | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	1.3
Net Realized Investments Gain Loss | Foreign Exchange Contracts | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	(13.8)
Net Investment Income | Interest Rate Swaps | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	43.1
Net Investment Income | Foreign Exchange Contracts | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	(5.9)
Interest and Debt Expense | Interest Rate Swaps | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	(1.7)
Other Expense | Reclassification Out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Benefit Costs
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Amortization of Net Actuarial Loss	(32.9)
Amortization of Prior Service Credit	5.0
Curtailment Gain	3.0
Income Tax Expense | Net Gain on Cash Flow Hedges
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Income Tax Expense (Benefit)	8.0
Income Tax Expense | Reclassification Out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Income Tax Expense (Benefit)	(4.8)
Income Tax Expense | Reclassification Out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Benefit Costs
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Income Tax Expense (Benefit)	$ (8.9)

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Reinsurance - Additional Information (Detail) (GBP £) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Number of companies that make up reinsurance recoverable	86
Number of companies that make up majority of reinsurance recoverable	13
Percent of reinsurance recoverable made up by majority of companies	91.00%
Remaining companies rated A- or better by AM best	8.00%
Percent of recoverable held with companies less than A-	1.00%
Reinsurance Agreement [Member] | Minimum
Quota Share Reinsurance Percentage	50.00%
Quota Share Coverage Amount	£ 0.5
Reinsurance Agreement [Member] | Maximum
Quota Share Reinsurance Percentage	100.00%

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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

The following tables provide the changes in the benefit obligation and fair value of plan assets and statements of the funded status of the plans.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Change in Benefit Obligation
Benefit Obligation at Beginning of Year	$	1,967.9		$	1,579.8		$	197.4		$	170.4		$	198.8		$	190.9
Service Cost	59.4			48.8			4.3			4.2			0.7			1.6
Interest Cost	86.3			84.4			8.6			8.5			8.0			9.6
Plan Participant Contributions	—			—			—			—			3.9			3.5
Actuarial (Gain) Loss	(225.9		)	291.4			2.6			9.4			(30.2		)	19.1
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Plan Amendment	—			—			—			—			—			(5.0		)
Curtailment	(126.8		)	—			(3.7		)	—			—			(4.2		)
Change in Foreign Exchange Rates	—			—			3.6			8.8			—			—
Benefit Obligation at End of Year	$	1,718.7		$	1,967.9		$	208.7		$	197.4		$	165.3		$	198.8
Accumulated Benefit Obligation at December 31	$	1,718.7		$	1,822.3		$	197.7		$	187.3		N/A			N/A
Change in Fair Value of Plan Assets
Fair Value of Plan Assets at Beginning of Year	$	1,353.6		$	1,170.8		$	205.6		$	188.0		$	11.5		$	11.7
Actual Return on Plan Assets	224.6			161.8			15.6			8.6			0.2			0.3
Employer Contributions	54.7			57.5			4.0			4.1			11.7			12.7
Plan Participant Contributions	—			—			—			—			3.9			3.5
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Change in Foreign Exchange Rates	—			—			4.6			8.8			—			—
Fair Value of Plan Assets at End of Year	$	1,590.7		$	1,353.6		$	225.7		$	205.6		$	11.4		$	11.5
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9		$	187.3

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

The amounts recognized in our consolidated balance sheets for our pension and OPEB plans at December 31, 2013 and 2012 are as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013		2012
	(in millions of dollars)
Current Liability	$	5.2		$	4.6		$	—		$	—		$	14.6	$	15.6
Noncurrent Liability	136.2			609.7			—			—			139.3		171.7
Noncurrent Asset	(13.4		)	—			(17.0		)	(8.2		)	—		—
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9	$	187.3
Unrecognized Pension and Postretirement Benefit Costs
Net Actuarial Gain (Loss)	$	(342.1	)	$	(845.4	)	$	(36.9	)	$	(37.9	)	$	10.3	$	(19.3	)
Prior Service Credit (Cost)	—			(0.6		)	—			(0.2		)	2.4		7.3
	(342.1		)	(846.0		)	(36.9		)	(38.1		)	12.7		(12.0		)
Deferred Income Tax Asset	119.7			296.1			10.9			11.1			5.8		14.4
Total Included in Accumulated Other Comprehensive Income (Loss)	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5	$	2.4

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The following table provides the changes recognized in other comprehensive income for the years ended December 31, 2013 and 2012.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	$	(549.9	)	$	(437.6	)	$	(27.0	)	$	(17.2	)	$	2.4		$	10.7
Net Actuarial Gain (Loss)
Amortization	31.7			45.9			1.2			0.5			—			—
Curtailment	126.8			—			—			—			—			4.2
All Other Changes	344.8			(218.2		)	(0.2		)	(13.4		)	29.6			(19.4		)
Prior Service Credit (Cost)
Amortization	(0.1		)	(0.4		)	—			—			(4.9		)	(2.6		)
Curtailment	0.7			—			(3.7		)	—			—			—
Plan Amendment	—			—			3.9			—			—			5.0
Change in Deferred Income Tax Asset	(176.4		)	60.4			(0.2		)	3.1			(8.6		)	4.5
Accumulated Other Comprehensive Income (Loss) at End of Year	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5		$	2.4

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Year Ended December 31, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(13.1	)	$	—	$	(1.0	)	$	60.5	$	—		$	175.1
Foreign Governments	82.1			—			(3.6		)	—		—			—		—			78.5
Public Utilities	574.4			—			(10.8		)	—		(3.1		)	151.8		(508.8		)	203.5
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(147.1		)	186.7		(122.0		)	1,462.0		(699.4		)	1,859.1
Redeemable Preferred Stocks	24.8			—			(1.0		)	—		—			—		—			23.8
Total Fixed Maturity Securities	1,988.3			1.1			(175.5		)	186.7		(126.2		)	1,674.3		(1,208.2		)	2,340.5
Equity Securities	4.3			—			0.3			—		—			—		—			4.6
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	30.7			—			—		—			—		—			(53.2		)
	Year Ended December 31, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.3	)	$	18.4	$	(0.7	)	$	43.2	$	—		$	128.7
Foreign Governments	—			—			5.0			15.4		—			61.7		—			82.1
Public Utilities	338.9			—			22.3			47.9		(4.2		)	481.4		(311.9		)	574.4
Mortgage/Asset-Backed Securities	31.7			—			—			—		(0.1		)	—		(31.1		)	0.5
All Other Corporate Bonds	665.5			1.2			40.8			151.6		(67.5		)	599.8		(213.6		)	1,177.8
Redeemable Preferred Stocks	37.2			(1.0		)	2.9			—		(14.3		)	—		—			24.8
Total Fixed Maturity Securities	1,141.4			0.2			70.7			233.3		(86.8		)	1,186.1		(556.6		)	1,988.3
Equity Securities	11.2			(0.1		)	—			—		(0.1		)	—		(6.7		)	4.3
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	51.8			—			—		—			—		—			(83.9		)

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation. Gains for the years ended December 31, 2013 and 2012 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at each year end were $30.7 million and $51.8 million, respectively. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Schedule of Assumptions Used [Table Text Block]

We use a December 31 measurement date for each of our plans. The weighted average assumptionsused in the measurement of our benefit obligations as of December 31 and our net periodic benefit costs for the years ended December 31 are as follows:

	Pension Benefits
	U.S. Plans				Non U.S. Plans				OPEB
	2013		2012		2013		2012		2013		2012
Benefit Obligations
Discount Rate	5.30	%	4.50	%	4.40	%	4.50	%	5.00	%	4.20	%
Rate of Compensation Increase	4.00	%	4.00	%	3.90	%	3.75	%	—	%	—	%
Net Periodic Benefit Cost
Discount Rate	4.50% / 5.00%*		5.40	%	4.50% / 4.60%**		4.90	%	4.20	%	5.20	%
Expected Return on Plan Assets	7.50	%	7.50	%	6.20% / 6.35%**		5.80	%	5.75	%	5.75	%
Rate of Compensation Increase	4.00	%	4.00	%	3.75	%	3.85	%	—	%	—	%

Schedule of Net Benefit Costs [Table Text Block]

Net Periodic Benefit Cost

The following table provides the components of the net periodic benefit cost for the plans described above for the years ended December 31.

	Pension Benefits
	U.S. Plans									Non U.S. Plans									OPEB
	2013			2012			2011			2013			2012			2011			2013			2012			2011
	(in millions of dollars)
Service Cost	$	59.4		$	48.8		$	42.7		$	4.3		$	4.2		$	4.8		$	0.7		$	1.6		$	1.9
Interest Cost	86.3			84.4			77.6			8.6			8.5			8.8			8.0			9.6			10.0
Expected Return on Plan Assets	(105.5		)	(88.8		)	(87.6		)	(12.5		)	(11.1		)	(12.2		)	(0.6		)	(0.7		)	(0.7		)
Amortization of:
Net Actuarial Loss	31.7			45.9			31.9			1.2			0.5			—			—			—			—
Prior Service Credit	(0.1		)	(0.4		)	(0.5		)	—			—			—			(4.9		)	(2.6		)	(2.6		)
Curtailment	0.7			—			—			(3.7		)	—			—			—			—			—
Total	$	72.5		$	89.9		$	64.1		$	(2.1	)	$	2.1		$	1.4		$	3.2		$	7.9		$	8.6

Schedule of Expected Benefit Payments [Table Text Block]

The following table provides expected benefit payments, which reflect expected future service, as appropriate.

	Pension Benefits
	U.S. Plans		Non U.S. Plans		OPEB
	(in millions of dollars)
Year					Gross		Subsidy Payments		Net
2014	$	45.1	$	5.4	$	16.4	$	1.8	$	14.6
2015	49.3		5.8		16.4		1.9		14.5
2016	54.6		6.1		16.2		2.1		14.1
2017	59.4		6.4		15.9		2.2		13.7
2018	64.7		6.7		15.6		2.4		13.2
2019-2023	421.9		38.9		70.3		14.2		56.1

Pension Benefits UK Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The categorization of fair value measurements by input level for the assets in our U.K. pension plan is as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	172.0	$	—	$	172.0
Fixed Interest and Index-linked Securities	52.6		0.4		—		53.0
Cash Equivalents	0.7		—		—		0.7
Total Plan Assets	$	53.3	$	172.4	$	—	$	225.7

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	154.7	$	—	$	154.7
Fixed Interest and Index-linked Securities	42.6		0.9		—		43.5
Cash Equivalents	7.4		—		—		7.4
Total Plan Assets	$	50.0	$	155.6	$	—	$	205.6

Other Postretirement Benefit Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The categorization of fair value measurements by input level for the assets in our OPEB plan is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.4	$	11.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.5	$	11.5

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The fair value is represented by the actuarial present value of future cash flows of the contracts.

Changes in our OPEB plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.5	$	0.2	$	15.6	$	(15.9	)	$	11.4

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.7	$	0.3	$	16.2	$	(16.7	)	$	11.5

Pension Benefits, U.S. Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The categorization of fair value measurements by input level for the invested assets in our U.S. pension plans is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	343.9	$	—	$	343.9
U.S. Mid Cap	—		139.6		—		139.6
U.S. Small Cap	231.9		—		—		231.9
International	134.5		131.7		—		266.2
Emerging Markets	—		76.3		—		76.3
Fixed Income Securities:
U.S. Government and Agencies	105.7		7.4		—		113.1
Corporate	97.8		172.6		—		270.4
State and Municipal Securities	—		12.9		—		12.9
Alternative Investments:
Private Equity Direct Investments	—		—		7.2		7.2
Private Equity Funds of Funds	—		—		29.6		29.6
Hedge Funds of Funds	—		—		66.9		66.9
Cash Equivalents	28.4		—		—		28.4
Total	$	598.3	$	884.4	$	103.7	$	1,586.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	269.2	$	—	$	269.2
U.S. Mid Cap	—		111.6		—		111.6
U.S. Small Cap	83.9		120.1		—		204.0
International	106.4		102.9		—		209.3
Emerging Markets	—		73.9		—		73.9
Fixed Income Securities:
U.S. Government and Agencies	138.0		8.6		—		146.6
Corporate	84.1		141.7		—		225.8
State and Municipal Securities	—		12.7		—		12.7
Alternative Investments:
Private Equity Funds of Funds	—		—		28.7		28.7
Hedge Funds of Funds	—		—		56.1		56.1
Cash Equivalents	13.1		—		—		13.1
Total	$	425.5	$	840.7	$	84.8	$	1,351.0

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Changes in our U.S. pension plans' assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Direct Investments	$	—	$	0.3	$	—	$	8.4	$	(1.5	)	$	—	$	—	$	7.2
Private Equity Funds of Funds	28.7		0.9		1.1		2.1		(3.2		)	—		—		29.6
Hedge Funds of Funds	56.1		6.3		—		4.9		(0.4		)	—		—		66.9
Total	$	84.8	$	7.5	$	1.1	$	15.4	$	(5.1	)	$	—	$	—	$	103.7

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Funds of Funds	$	23.7	$	0.5	$	1.0	$	6.0	$	(2.5	)	$	—	$	—	$	28.7
Hedge Funds of Funds	44.3		3.8		—		11.8		(3.8		)	—		—		56.1
Total	$	68.0	$	4.3	$	1.0	$	17.8	$	(6.3	)	$	—	$	—	$	84.8

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Assets
Fixed Maturity Securities	$ 42,344.4		$ 44,973.0
Mortgage Loans	1,815.1	[1]	1,712.7
Policy Loans	3,276.0	[1]	3,133.8
Other Long-term Investments
Equity Securities	16.4		14.6
Policyholders' Funds
Long-term Debt	2,612.0		2,755.4
Other Liabilities
Unfunded commitment to fund Investment Partnerships	27.2
Carrying Amount
Assets
Fixed Maturity Securities	42,344.4		44,973.0
Mortgage Loans	1,815.1		1,712.7
Policy Loans	3,276.0		3,133.8
Other Long-term Investments
Derivative Assets	10.8	[2]	81.6
Equity Securities	16.4		14.6
Miscellaneous Long-Term Investments	475.2		455.1
Policyholders' Funds
Deferred Annuity Products	631.5		640.1
Supplementary Contracts without Life Contingencies	563.1		535.5
Long-term Debt	2,612.0		2,755.4
Other Liabilities
Derivatives	135.6		170.5
Embedded Derivative in Modified Coinsurance Arrangement	53.2		83.9
Unfunded commitment to fund Investment Partnerships	27.2		83.7
Fair Value
Assets
Fixed Maturity Securities	42,344.4		44,973.0
Mortgage Loans	1,980.2		1,937.1
Policy Loans	3,339.6		3,215.3
Other Long-term Investments
Derivative Assets	10.8		81.6
Equity Securities	16.4		14.6
Miscellaneous Long-Term Investments	475.2		455.1
Policyholders' Funds
Deferred Annuity Products	631.5		640.1
Supplementary Contracts without Life Contingencies	563.1		535.5
Long-term Debt	2,824.4		2,968.8
Other Liabilities
Derivatives	135.6		170.5
Embedded Derivative in Modified Coinsurance Arrangement	53.2		83.9
Unfunded commitment to fund Investment Partnerships	$ 27.2		$ 83.7

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

[2] (2)Derivatives are carried at fair value.

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Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	$ 42,344,400,000	$ 44,973,000,000
Fair value of fixed maturity securities, gross unrealized gain	4,358,700,000	7,277,500,000
Fair Value of fixed maturity securities, gross unrealized loss	303,900,000	56,000,000
Fixed Maturity Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	0	0	1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held			8,500,000
Commitment to fund private placement fixed maturity securities	58,000,000
Carrying amount of variable interest entity investments	470,800,000
Unfunded commitment to fund Investment Partnerships	27,200,000
Commitment to fund partnership Equity Investments	158,400,000
Other Long-term Investments	566,000,000	625,000,000
Commitments to Fund Special Purpose Entities	0
Amount Funded to Special Purpose Entity Partnerships	nor did we fund any amounts to the partnerships	nor did we fund any amounts to the partnership	nor did we fund any amounts to the partnership
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%
Loan to Value Ratio Update Frequency	3 years
Mortgage Loan Inspection Frequency	2 years
Mortage Loan Policy Debt Service coverage ratio lower range	125.00%
Mortgage Loans issuance, term years	25
Number of Changes to Accounting Policy for Estimating Credit Losses on Mortgage Loans	0
Impaired Financing Receivable, Average Recorded Investment	14,900,000	19,100,000	21,300,000
Impaired Financing Receivable, Interest Income, Accrual Method	800,000	800,000	800,000
Foreclosed Real Estate Expense	0	0	0
Financing Receivable, Recorder Investment, Nonaccrual status	0	1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,300,000
Committments to Fund Commercial Mortgage Loans	83,900,000
Repurchase agreements - Typical Days outstanding	30
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral	102.00%
Securities Loaned	201,600,000	452,800,000
Outstanding Repurchase Agreements	0	0
Off Balance Sheet Amount
Schedule of Investments [Line Items]
Cash Collateral for Borrowed Securities	76,500,000	455,800,000
Securities Received as Collateral	132,900,000	14,500,000
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Amount of days past due-DelinquentMortgageLoan	90 days	90 days
Special Purpose Entity | Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	136,200,000
Special Purpose Entity | Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	4,400,000
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	309,500,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	161,300,000
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	39,145,100,000
Fair value of fixed maturity securities, gross unrealized gain	4,205,000,000
Fair Value of fixed maturity securities, gross unrealized loss	247,800,000
Fixed maturity securities in unrealized loss position, percent of total	81.50%
Number of fixed maturity securities that were in an unrealized loss position	245
Number of fixed maturity securities in an unrealized loss position continuously for over one year	16
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	3,199,300,000
Fair value of fixed maturity securities, gross unrealized gain	153,700,000
Fair Value of fixed maturity securities, gross unrealized loss	$ 56,100,000
Fixed maturity securities in unrealized loss position, percent of total	18.50%
Number of fixed maturity securities that were in an unrealized loss position	53
Number of fixed maturity securities in an unrealized loss position continuously for over one year	8

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Investments
Fixed Maturity Securities - at fair value (amortized cost: $38,289.6; $37,751.5)	$ 42,344.4		$ 44,973.0
Mortgage Loans	1,815.1	[1]	1,712.7
Policy Loans	3,276.0	[1]	3,133.8
Other Long-term Investments	566.0		625.0
Short-term Investments	913.4		1,460.3
Total Investments	48,914.9		51,904.8
Other Assets
Cash and Bank Deposits	94.1		77.3
Accounts and Premiums Receivable	1,647.8		1,632.6
Reinsurance Recoverable	4,806.5		4,842.6
Accrued Investment Income	700.2		694.6
Deferred Acquisition Costs	1,829.2		1,755.5
Goodwill	200.9		201.7
Property and Equipment	511.9		501.6
Income Tax Receivable	50.3		0
Other Assets	647.8		625.4
Total Assets	59,403.6		62,236.1
Liabilities
Policy and Contract Benefits	1,511.0		1,484.6
Reserves for Future Policy and Contract Benefits	43,099.1		44,694.4
Unearned Premiums	413.8		426.7
Other Policyholders' Funds	1,658.4		1,644.9
Income Tax Payable	0		54.2
Deferred Income Tax	144.3		269.4
Short-term Debt	76.5		455.8
Long-term Debt	2,612.0		2,755.4
Other Liabilities	1,229.4		1,838.1
Total Liabilities	50,744.5		53,623.5
Commitments and Contingent Liabilities - Note 14
Stockholders' Equity
Common Stock, $0.10 par; authorized: 725,000 shares; issued: 360,802,426 and 359,751,943 shares	36.1		36.0
Additional Paid-in Capital	2,634.1		2,607.7
Accumulated Other Comprehensive Income	255.0		628.0
Retained Earnings	8,083.2		7,371.6
Treasury Stock - at cost: 100,785,012 and 89,546,758 shares	2,349.3		2,030.7
Total Stockholders' Equity	8,659.1		8,612.6
Total Liabilities and Stockholders' Equity	$ 59,403.6		$ 62,236.1

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

XML

Statutory Financial Information (Tables)

12 Months Ended

Dec. 31, 2013

Statutory Financial Information [Abstract]

Statutory Accounting Practices Disclosure [Table Text Block]

The operating results and capital and surplus of our traditional U.S. life insurance subsidiaries and our captive reinsurers, prepared in accordance with prescribed or permitted accounting practices of the NAIC or states of domicile, are presented separately below. Results for 2012 and prior include those for UPIL as filed with insurance regulators in Bermuda.

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Combined Net Income
Traditional U.S. Life Insurance Subsidiaries	$	584.5	$	624.5	$	642.9
Captive Reinsurers	$	13.3	$	40.8	$	64.6
Combined Net Gain from Operations
Traditional U.S. Life Insurance Subsidiaries	$	617.5	$	649.8	$	664.0
Captive Reinsurers	$	13.6	$	37.4	$	55.4

Statutory Capital and Surplus [Table Text Block]

	December 31
	2013		2012
	(in millions of dollars)
Combined Capital and Surplus
Traditional U.S. Life Insurance Subsidiaries	$	3,450.5	$	3,426.5
Captive Reinsurers	$	1,679.4	$	1,765.3

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Employee Benefit Plans US Pension Assets, Fair Value Inputs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	$ 16.4	$ 14.6
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Cash Equivalents, at Carrying Value	28.4	13.1
Defined Benefit Plan, Fair Value of Plan Assets	1,586.4	1,351.0
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	11.8	10.3
Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Cash Equivalents, at Carrying Value	0	0
Defined Benefit Plan, Fair Value of Plan Assets	884.4	840.7
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	4.6	4.3
Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Cash Equivalents, at Carrying Value	0	0
Defined Benefit Plan, Fair Value of Plan Assets	103.7	84.8
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Cash Equivalents, at Carrying Value	28.4	13.1
Defined Benefit Plan, Fair Value of Plan Assets	598.3	425.5
U.S. Mid Cap [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	139.6	111.6
U.S. Mid Cap [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	139.6	111.6
U.S. Mid Cap [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
U.S. Mid Cap [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
U.S. Small Cap [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	231.9	204.0
U.S. Small Cap [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	120.1
U.S. Small Cap [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
U.S. Small Cap [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	231.9	83.9
International Securities [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	266.2	209.3
International Securities [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	131.7	102.9
International Securities [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
International Securities [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	134.5	106.4
Emerging Markets [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	76.3	73.9
Emerging Markets [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	76.3	73.9
Emerging Markets [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
Emerging Markets [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
United States Government and Government Agencies and Authorities | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	113.1	146.6
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	7.4	8.6
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	0	0
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	105.7	138.0
Corporate Debt Securities [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	270.4	225.8
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	172.6	141.7
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	97.8	84.1
States, Municipalities, and Political Subdivisions | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	12.9	12.7
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	12.9	12.7
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	0	0
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fixed Interest and Index-linked Securities	0	0
PrivateEquityDirectInvestment [Domain] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	7.2
PrivateEquityDirectInvestment [Domain] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0
PrivateEquityDirectInvestment [Domain] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	7.2
PrivateEquityDirectInvestment [Domain] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0
Private Equity Funds | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	29.6	28.7
Private Equity Funds | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0	0
Private Equity Funds | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	29.6	28.7
Private Equity Funds | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0	0
Hedge Funds [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	66.9	56.1
Hedge Funds [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0	0
Hedge Funds [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	66.9	56.1
Hedge Funds [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Alternative Investments, Fair Value Disclosure	0	0
U.S. Large Cap [Member] | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	343.9	269.2
U.S. Large Cap [Member] | Fair Value, Inputs, Level 2 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	343.9	269.2
U.S. Large Cap [Member] | Fair Value, Inputs, Level 3 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	0	0
U.S. Large Cap [Member] | Fair Value, Inputs, Level 1 | Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Equity Securities	$ 0	$ 0

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Schedule IV Reinsurance (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums, Life Insurance in Force									$ 781,495.9	$ 832,587.5	$ 782,935.6
Ceded Premiums, Life Insurance in Force									25,904.7	28,658.7	28,341.1
Assumed Premiums, Life Insurance in Force									1,026.2	1,073.8	1,141.6
Premiums, Net, Life Insurance in Force									756,617.4	805,002.6	755,736.1
Life Insurance in Force Premiums, Percentage Assumed to Net									0.10%	0.10%	0.20%
Gross Amount									7,777.3	7,736.0	7,521.5
Reinsurance Ceded									355.8	230.8	223.9
Assumed Premiums Earned									203.2	210.9	216.6
Net Amount	1,890.7	1,897.3	1,905.8	1,930.9	1,937.2	1,929.4	1,927.6	1,921.9	7,624.7	7,716.1	7,514.2
Percentage of Amount Assumed to Net									2.70%	2.70%	2.90%
Life Insurance Product Line
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									2,018.7	1,979.1	1,868.8
Reinsurance Ceded									253.6	141.4	146.6
Assumed Premiums Earned									10.0	10.3	10.9
Net Amount									1,775.1	1,848.0	1,733.1
Percentage of Amount Assumed to Net									0.60%	0.60%	0.60%
Accident and Health Insurance Segment
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									5,758.6	5,756.9	5,652.7
Reinsurance Ceded									102.2	89.4	77.3
Assumed Premiums Earned									193.2	200.6	205.7
Net Amount									$ 5,849.6	$ 5,868.1	$ 5,781.1
Percentage of Amount Assumed to Net									3.30%	3.40%	3.60%

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Reinsurance - Premium Income Data (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premium Income									$ 7,777.3	$ 7,736.0	$ 7,521.5
Reinsurance Assumed									203.2	210.9	216.6
Reinsurance Ceded									(355.8)	(230.8)	(223.9)
Premium Income	1,890.7	1,897.3	1,905.8	1,930.9	1,937.2	1,929.4	1,927.6	1,921.9	7,624.7	7,716.1	7,514.2
Ceded Benefits and Change in Reserves for Future Benefits									$ 728.7	$ 591.7	$ 609.2

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in Net Unrealized Gain on Securities Before Adjustment, Tax Expense (Benefit)	$ (1,102.8)	$ 467.7	$ 798.3
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance, Tax Expense (Benefit)	743.3	(325.6)	(701.5)
Change in Net Gain on Cash Flow Hedges, Tax Expense (Benefit)	(1.3)	(4.3)	25.2
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense (Benefit)	$ 185.2	$ (68.0)	$ (67.4)

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Employee Benefit Plans Amounts Recognized in Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 5.2	$ 4.6
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	136.2	609.7
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	(13.4)	0
Defined Benefit Plan, Funded Status of Plan	128.0	614.3
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(342.1)	(845.4)
Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	(0.6)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(342.1)	(846.0)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	119.7	296.1
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(222.4)	(549.9)	(437.6)
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	0	0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	0	0
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	(17.0)	(8.2)
Defined Benefit Plan, Funded Status of Plan	(17.0)	(8.2)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(36.9)	(37.9)
Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	(0.2)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(36.9)	(38.1)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	10.9	11.1
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(26.0)	(27.0)	(17.2)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	14.6	15.6
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	139.3	171.7
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0
Defined Benefit Plan, Funded Status of Plan	153.9	187.3
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	10.3	(19.3)
Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	2.4	7.3		(4.4)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	12.7	(12.0)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	5.8	14.4
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ 18.5	$ 2.4	$ 10.7

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 38,289.6	[1]	$ 37,751.5
Gross Unrealized Gain	4,358.7		7,277.5
Gross Unrealized Loss	303.9		56.0
Fixed Maturity Securities	42,344.4		44,973.0
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,028.6	[1]	1,020.9
Gross Unrealized Gain	173.1		329.0
Gross Unrealized Loss	5.6		1.1
Fixed Maturity Securities	1,196.1		1,348.8
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,706.0	[1]	1,498.4
Gross Unrealized Gain	117.2		316.2
Gross Unrealized Loss	40.0		7.8
Fixed Maturity Securities	1,783.2		1,806.8
Foreign Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,226.4	[1]	1,280.4
Gross Unrealized Gain	149.6		226.6
Gross Unrealized Loss	2.8		0
Fixed Maturity Securities	1,373.2		1,507.0
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,328.9	[1]	9,294.3
Gross Unrealized Gain	1,126.9		1,865.0
Gross Unrealized Loss	52.8		15.1
Fixed Maturity Securities	10,403.0		11,144.2
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,858.7	[1]	1,927.9
Gross Unrealized Gain	184.6		289.1
Gross Unrealized Loss	4.0		0.5
Fixed Maturity Securities	2,039.3		2,216.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	23,108.0	[1]	22,696.6
Gross Unrealized Gain	2,602.6		4,245.3
Gross Unrealized Loss	198.7		31.5
Fixed Maturity Securities	25,511.9		26,910.4
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	33.0	[1]	33.0
Gross Unrealized Gain	4.7		6.3
Gross Unrealized Loss	0		0
Fixed Maturity Securities	$ 37.7		$ 39.3

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Employee Benefit Plans OPEB Plan Assets, Fair Value Measurements by Input Level (Details) (Other Postretirement Benefit Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	$ 11.4	$ 11.5
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	0	0
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	11.4	11.5
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	$ 0	$ 0

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Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Notional Amounts for Each Category of Derivative Activity

The table below summarizes, by notional amounts, the activity for each category of derivatives. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	—	$	—	$	1,681.9
Additions	—		—		—		—		46.9		—		46.9
Terminations	—		63.9		205.0		—		46.9		—		315.8
Balance at December 31, 2011	174.0		554.0		685.0		—		—		—		1,413.0
Additions	—		—		250.0		—		86.0		—		336.0
Terminations	—		45.2		185.0		—		86.0		—		316.2
Balance at December 31, 2012	174.0		508.8		750.0		—		—		—		1,432.8
Additions	—		160.0		—		97.0		24.0		10.0		291.0
Terminations	24.0		38.4		150.0		—		24.0		10.0		246.4
Balance at December 31, 2013	$	150.0	$	630.4	$	600.0	$	97.0	$	—	$	—	$	1,477.4

Location and Fair Values of Derivative Financial Instruments

The following tables summarize the location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	December 31, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	9.2	Other Liabilities	$	35.0
Foreign Exchange Contracts	Other L-T Investments	1.6		Other Liabilities	98.7
Total		$	10.8		$	133.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.9
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	53.2
Total					$	55.1

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments

The following table summarizes the location of gains and losses on the effective portion of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of income and consolidated statements of comprehensive income.

		Year Ended December 31
		2013			2012			2011
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	(7.2	)	$	77.9		$	50.3
Options		(0.1		)	—			—
Foreign Exchange Contracts		22.6			3.5			22.4
	Total	$	15.3		$	81.4		$	72.7
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	43.1		$	40.0		$	34.8
	Foreign Exchange Contracts	(5.9		)	(5.3		)	(1.1		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	1.3			4.1			3.5
	Foreign Exchange Contracts	(13.8		)	(17.0		)	10.1
Interest and Debt Expense
	Interest Rate Swaps	(1.7		)	(1.7		)	(1.6		)
	Total	$	23.0		$	20.1		$	45.7

Location of and Gain (Loss) on Derivatives Not Designated as Hedging Instruments

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

		Year Ended December 31
		2013			2012		2011
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.9	)	$	—	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8		(39.4		)
	Total	$	28.8		$	51.8	$	(39.4	)

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Parent Company Cash Flow Statement (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	$ 1,031.5	$ 1,379.6	$ 1,193.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	1,040.5	595.9	1,181.9
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	2,146.4	2,160.5	1,692.7
Proceeds from Sales and Maturities of Other Investments	243.4	182.2	131.9
Purchase of Fixed Maturity Securities	(3,553.6)	(3,512.8)	(2,760.1)
Purchase of Other Investments	(363.7)	(353.8)	(304.1)
Net Sales (Purchases) of Short-term Investments	552.4	(80.1)	(254.6)
Net Purchases of Property and Equipment	(105.5)	(105.4)	(98.2)
Other, Net	0.2	0.1	0.2
Net Cash Provided by (Used in) Investing Activities	(39.9)	(1,113.4)	(410.3)
Cash Flows from Financing Activities
Proceeds from (Repayments of) Short-term Debt	(379.3)	143.5	87.2
Issuance of Long-term Debt	0	246.4	0
Issuance of Common Stock	11.4	4.9	14.8
Purchases of Treasury Stock	(317.2)	(496.7)	(619.9)
Dividends Paid to Stockholders	(146.5)	(133.8)	(121.0)
Other, Net	(27.0)	0.2	2.9
Net Cash Used by Financing Activities	(974.8)	(305.5)	(720.4)
Net Increase (Decrease) in Cash and Bank Deposits	16.8	(39.3)	63.0
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	612.5	677.3	827.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	0	0	133.9
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	38.5	47.7	44.5
Proceeds from Sales and Maturities of Other Investments	9.4	1.0	0
Purchase of Fixed Maturity Securities	(139.8)	(99.1)	0
Purchase of Other Investments	0	(13.7)	(3.0)
Net Sales (Purchases) of Short-term Investments	269.5	40.4	192.8
Cash Distributions to Subsidiaries	(225.1)	(175.2)	(166.1)
Net Purchases of Property and Equipment	(78.8)	(80.4)	(81.1)
Other, Net	(0.9)	0.1	0.2
Net Cash Provided by (Used in) Investing Activities	(127.2)	(279.2)	121.2
Cash Flows from Financing Activities
Proceeds from (Repayments of) Short-term Debt	(6.3)	4.1	(222.6)
Issuance of Long-term Debt	0	246.4	0
Issuance of Common Stock	11.4	4.9	14.8
Purchases of Treasury Stock	(317.2)	(496.7)	(619.9)
Dividends Paid to Stockholders	(146.5)	(133.8)	(121.0)
Other, Net	(0.3)	1.6	0
Net Cash Used by Financing Activities	(458.9)	(373.5)	(948.7)
Net Increase (Decrease) in Cash and Bank Deposits	$ 26.4	$ 24.6	$ 0.3

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,815.1	[1]	$ 1,712.7
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	777.4		624.7
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	867.5		858.8
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	107.6		142.5
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 62.6		$ 86.7

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Segment Information

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Closed Block and the Corporate segment.

The Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business, which are comprised of individual disability - recently issued insurance and voluntary benefits products. These products are marketed through our field sales personnel who work in conjunction with independent brokers and consultants.

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental lines of business, which include individual disability and critical illness products. Unum UK's products are sold primarily in the United Kingdom through field sales personnel and independent brokers and consultants.

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products and marketed to employees at the workplace through an independent contractor agency sales force and brokers.

The Closed Block segment consists of individual disability, group and individual long-term care, and other insurance products no longer actively marketed. The individual disability line of business in this segment generally consists of policies we sold prior to the mid-1990s and entirely discontinued selling in 2004, other than update features contractually allowable on existing policies. We discontinued offering group long-term care in 2012 and individual long-term care in 2009. Other insurance products include group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous product lines.

The Corporate segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt other than non-recourse debt, and certain other corporate income and expense not allocated to a line of business.

We measure and analyze our segment performance using non-GAAP financial measures. A non-GAAP financial measure is a numerical measure of a company's performance, financial position, or cash flows that excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. The non-GAAP financial measures of "operating revenue" and "operating income" or "operating loss" differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of net realized investment gains and losses, non-operating retirement-related gains or losses, and certain other items as specified in the reconciliations below. We believe operating revenue and operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. Realized investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains or losses. Although we may experience realized investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities. The amortization of prior period actuarial gains or losses, a component of the net periodic benefit cost for our pensions and other postretirement benefit plans, is driven by market performance as well as plan amendments and is not indicative of the operational results of our businesses. We believe that excluding the amortization of prior period gains or losses from operating income or loss provides investors with additional information for comparison and analysis of our operating results. Although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and have historically increased or decreased over time, depending on plan amendments and market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of "operating revenue" to total revenue and "operating income" to income before income taxes is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Operating Revenue	$	10,347.0		$	10,459.2		$	10,282.9
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Total Revenue	$	10,353.8		$	10,515.4		$	10,278.0
Operating Income	$	1,241.8		$	1,239.7		$	1,323.2
Net Realized Investment Gain (Loss)	6.8			56.2			(4.9		)
Non-operating Retirement-related Loss	(32.9		)	(46.4		)	(31.9		)
Unclaimed Death Benefits Reserve Increase for Unum US	(75.4		)	—			—
Unclaimed Death Benefits Reserve Increase for Colonial Life	(20.1		)	—			—
Group Life Waiver of Premium Benefit Reserve Reduction for Unum US	85.0			—			—
Deferred Acquisition Costs Impairment and Reserve Charges for Long-term Care Closed Block	—			—			(769.6		)
Reserve Charge for Individual Disability Closed Block	—			—			(183.5		)
Income Before Income Tax	$	1,205.2		$	1,249.5		$	333.3

Premium income by major line of business within each of our segments is presented as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	1,553.9	$	1,578.8	1,580.2
Group Short-term Disability	519.6		476.7		455.2
Group Life and Accidental Death & Dismemberment
Group Life	1,213.9		1,182.1		1,106.7
Accidental Death & Dismemberment	121.6		115.3		109.2
Supplemental and Voluntary
Individual Disability - Recently Issued	465.3		477.6		464.7
Voluntary Benefits	642.8		626.0		580.0
	4,517.1		4,456.5		4,296.0
Unum UK
Group Long-term Disability	389.9		409.7		419.6
Group Life	106.4		221.3		203.6
Supplemental	60.3		63.6		64.4
	556.6		694.6		687.6
Colonial Life
Accident, Sickness, and Disability	738.7		724.5		695.3
Life	221.1		209.7		190.7
Cancer and Critical Illness	272.4		260.3		249.3
	1,232.2		1,194.5		1,135.3
Closed Block
Individual Disability	687.5		736.4		787.0
Long-term Care	630.6		631.9		608.1
All Other	0.7		2.2		0.2
	1,318.8		1,370.5		1,395.3
Total	$	7,624.7	$	7,716.1	$	7,514.2

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Year Ended December 31, 2013
Premium Income	$	4,517.1	$	556.6	$	1,232.2	$	1,318.8	$	—		$	7,624.7
Net Investment Income	929.6		148.5		145.4		1,272.3		(3.7		)	2,492.1
Other Income	128.3		0.1		0.2		93.9		7.7			230.2
Operating Revenue	$	5,575.0	$	705.2	$	1,377.8	$	2,685.0	$	4.0		$	10,347.0
Operating Income (Loss)	$	859.0	$	132.0	$	284.9	$	109.4	$	(143.5	)	$	1,241.8
Interest and Debt Expense	$	0.1	$	—	$	—	$	8.4	$	140.9		$	149.4
Depreciation and Amortization	$	292.5	$	22.5	$	188.7	$	5.2	$	0.9		$	509.8
Year Ended December 31, 2012
Premium Income	$	4,456.5	$	694.6	$	1,194.5	$	1,370.5	$	—		$	7,716.1
Net Investment Income	952.3		170.8		138.6		1,230.5		23.0			2,515.2
Other Income	124.6		0.1		0.3		100.1		2.8			227.9
Operating Revenue	$	5,533.4	$	865.5	$	1,333.4	$	2,701.1	$	25.8		$	10,459.2
Operating Income (Loss)	$	847.1	$	131.3	$	274.3	$	95.5	$	(108.5	)	$	1,239.7
Interest and Debt Expense	$	1.1	$	—	$	—	$	10.4	$	133.9		$	145.4
Depreciation and Amortization	$	255.6	$	27.2	$	181.0	$	3.9	$	0.8		$	468.5
Year Ended December 31, 2011
Premium Income	$	4,296.0	$	687.6	$	1,135.3	$	1,395.3	$	—		$	7,514.2
Net Investment Income	951.4		189.9		132.4		1,189.7		56.2			2,519.6
Other Income	121.6		0.3		0.5		106.1		20.6			249.1
Operating Revenue	$	5,369.0	$	877.8	$	1,268.2	$	2,691.1	$	76.8		$	10,282.9
Operating Income (Loss)	$	816.9	$	190.7	$	270.1	$	123.9	$	(78.4	)	$	1,323.2
Interest and Debt Expense	$	1.0	$	—	$	—	$	10.5	$	131.8		$	143.3
Depreciation and Amortization	$	245.9	$	26.8	$	164.6	$	16.9	$	0.8		$	455.0

The following table provides the changes in deferred acquisition costs by segment:

							Colonial			Closed
	Unum US			Unum UK			Life			Block			Total
	(in millions of dollars)
Year Ended December 31, 2013
Beginning of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Capitalized	252.0			9.8			205.0			—			466.8
Amortization	(230.0		)	(14.7		)	(174.2		)	—			(418.9		)
Adjustment Related to Unrealized Investment Gains/Losses	5.2			—			20.2			—			25.4
Foreign Currency	—			0.4			—			—			0.4
End of Year	$	1,051.5		$	34.3		$	743.4		$	—		$	1,829.2
Year Ended December 31, 2012
Beginning of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1
Capitalized	249.2			11.8			206.3			—			467.3
Amortization	(196.5		)	(15.7		)	(166.5		)	—			(378.7		)
Adjustment Related to Unrealized Investment Gains/Losses	(0.2		)	—			(11.8		)	—			(12.0		)
Foreign Currency	—			1.8			—			—			1.8
End of Year	$	1,024.3		$	38.8		$	692.4		$	—		$	1,755.5
Year Ended December 31, 2011
Beginning of Year	$	943.7		$	41.0		$	628.0		$	203.4		$	1,816.1
Capitalized	220.3			15.4			203.1			3.7			442.5
Amortization	(188.1		)	(15.3		)	(151.2		)	(11.1		)	(365.7		)
Impairment of Long-term Care Deferred Acquisition Costs	—			—			—			(196.0		)	(196.0		)
Adjustment Related to Unrealized Investment Gains/Losses	(4.1		)	—			(15.5		)	—			(19.6		)
Foreign Currency	—			(0.2		)	—			—			(0.2		)
End of Year	$	971.8		$	40.9		$	664.4		$	—		$	1,677.1

Assets by segment are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,384.3	$	19,391.2
Unum UK	3,654.1		3,975.8
Colonial Life	3,482.9		3,434.9
Closed Block	31,564.2		33,069.2
Corporate	2,318.1		2,365.0
Total	$	59,403.6	$	62,236.1

Revenue is primarily derived from sources in the United States and the United Kingdom. There are no material revenues or assets attributable to foreign operations other than those reported in our Unum UK segment.

We report goodwill in our Unum US segment and in our Unum UK segment, which are the segments expected to benefit from the originating business combinations. At December 31, 2013 and 2012, goodwill was $200.9 million and $201.7 million, respectively, with $189.0 million attributable to Unum US and the remainder attributable to Unum UK.

Stockholders' equity is allocated to the operating segments on the basis of an internal allocation formula that reflects the volume and risk components of each operating segment's business and aligns allocated equity with our target capital levels for regulatory and rating agency purposes. We modify this formula periodically to recognize changes in the views of capital requirements.

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Comprehensive Income (Loss)

Components of our accumulated other comprehensive income, after tax, and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(746.4		)	9.7			25.5			328.6			(382.6		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	8.6			(15.0		)	—			16.0			9.6
	Net Other Comprehensive Income (Loss)	(737.8		)	(5.3		)	25.5			344.6			(373.0		)
Balance at December 31, 2013		$	135.7		$	396.3		$	(47.1	)	$	(229.9	)	$	255.0

Schedule of Net Unrealized Gain on Securities

The net unrealized gain on securities consists of the following components:

	December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	4,054.8		$	7,221.5		$	(3,166.7	)
Other Investments	55.5			92.8			(37.3		)
Deferred Acquisition Costs	(41.6		)	(67.0		)	25.4
Reserves for Future Policy and Contract Benefits	(4,108.5		)	(6,277.5		)	2,169.0
Reinsurance Recoverable	263.8			351.5			(87.7		)
Deferred Income Tax	(88.3		)	(447.8		)	359.5
Total	$	135.7		$	873.5		$	(737.8	)

Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income

Amounts reclassified from accumulated other comprehensive income were recognized in our consolidated statements of income as follows:

			Year Ended
			December 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(12.6	)
		Other-Than-Temporary Impairment Loss	(0.8		)
			(13.4		)
	Income Tax Benefit		(4.8		)
	Total		$	(8.6	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	43.1
		Loss on Foreign Exchange Contracts	(5.9		)
	Net Realized Investment Gain (Loss)
		Gain on Interest Rate Swaps	1.3
		Loss on Foreign Exchange Contracts	(13.8		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(1.7		)
			23.0
	Income Tax Expense		8.0
	Total		$	15.0
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(32.9	)
		Amortization of Prior Service Credit	5.0
		Curtailment Gain	3.0
			(24.9		)
	Income Tax Benefit		(8.9		)
	Total		$	(16.0	)

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Employee Benefit Plans UK Pension Assets, Fair Value Measurement by Input Level (Details) (Pension Benefits UK Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Diversified Growth Assets	$ 172.0	$ 154.7
Fixed Interest and Index-linked Securities	53.0	43.5
Cash Equivalents, at Carrying Value	0.7	7.4
Defined Benefit Plan, Fair Value of Plan Assets	225.7	205.6
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Diversified Growth Assets	172.0	154.7
Fixed Interest and Index-linked Securities	0.4	0.9
Cash Equivalents, at Carrying Value	0	0
Defined Benefit Plan, Fair Value of Plan Assets	172.4	155.6
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Diversified Growth Assets	0	0
Fixed Interest and Index-linked Securities	0	0
Cash Equivalents, at Carrying Value	0	0
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Diversified Growth Assets	0	0
Fixed Interest and Index-linked Securities	52.6	42.6
Cash Equivalents, at Carrying Value	0.7	7.4
Defined Benefit Plan, Fair Value of Plan Assets	$ 53.3	$ 50.0

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Statutory Financial Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States Traditional Insurance Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory Net Income	$ 584.5	$ 624.5	$ 642.9
Statutory Combined Net Gain from Operations	617.5	649.8	664.0
CaptiveReinsurers [Domain]
Statutory Accounting Practices [Line Items]
Statutory Net Income	13.3	40.8	64.6
Statutory Combined Net Gain from Operations	$ 13.6	$ 37.4	$ 55.4

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Statutory Financial Information

12 Months Ended

Dec. 31, 2013

Statutory Financial Information [Abstract]

Statutory Financial Information

Statutory Financial Information

Statutory Net Income, Capital and Surplus, and Dividends

Statutory net income for U.S. insurance companies is reported in conformity with statutory accounting principles prescribed by the National Association of Insurance Commissioners (NAIC) and adopted by applicable domiciliary state laws. The commissioners of the states of domicile have the right to permit other specific practices that may deviate from prescribed practices. Our traditional U.S. life insurance subsidiaries have no prescribed or permitted statutory accounting practices that differ materially from statutory accounting principles prescribed by the NAIC.

Certain of our traditional U.S. life insurance subsidiaries cede blocks of business to Northwind Re, Tailwind Re, and UnumProvident International Ltd. (UPIL), all of which are affiliated captive reinsurance subsidiaries (captive reinsurers) with Unum Group as the ultimate parent. These captive reinsurers were established for the limited purpose of reinsuring risks attributable to specified policies issued or reinsured by our life insurance subsidiaries. The captive reinsurers are all domiciled in the United States as of December 31, 2013. Our captive reinsurers have no material state prescribed accounting practices, except for UPIL. During 2013, we re-domesticated UPIL, which was previously domiciled in Bermuda, to the state of Vermont. Vermont reporting requirements for pure captive insurance companies follow GAAP, unless the commissioner permits the use of some other basis of accounting. UPIL has permission from Vermont to follow accounting practices that are generally consistent with current NAIC statutory accounting principles for its insurance reserves and invested assets supporting reserves. All other assets and liabilities are accounted for in accordance with GAAP, as prescribed by Vermont, which allows for the full recognition of deferred tax assets which are more likely than not to be realized. Statutory accounting principles have a stricter limitation for the recognition of deferred tax assets. The impact of following the prescribed and permitted practices of Vermont rather than statutory accounting principles prescribed by the NAIC resulted in higher capital and surplus for UPIL of approximately $176 million as of December 31, 2013.

The operating results and capital and surplus of our traditional U.S. life insurance subsidiaries and our captive reinsurers, prepared in accordance with prescribed or permitted accounting practices of the NAIC or states of domicile, are presented separately below. Results for 2012 and prior include those for UPIL as filed with insurance regulators in Bermuda.

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Combined Net Income
Traditional U.S. Life Insurance Subsidiaries	$	584.5	$	624.5	$	642.9
Captive Reinsurers	$	13.3	$	40.8	$	64.6
Combined Net Gain from Operations
Traditional U.S. Life Insurance Subsidiaries	$	617.5	$	649.8	$	664.0
Captive Reinsurers	$	13.6	$	37.4	$	55.4

	December 31
	2013		2012
	(in millions of dollars)
Combined Capital and Surplus
Traditional U.S. Life Insurance Subsidiaries	$	3,450.5	$	3,426.5
Captive Reinsurers	$	1,679.4	$	1,765.3

As derived from the most recent annual statutory basis financial statements filed with insurance regulators, the statutory net income and statutory capital and surplus of our United Kingdom insurance subsidiary, Unum Limited, was £94.6 million and £438.1 million, respectively.

Restrictions under applicable state insurance laws limit the amount of dividends that can be paid to a parent company from its insurance subsidiaries in any 12-month period without prior approval by regulatory authorities. For life insurance companies domiciled in the U.S., that limitation generally equals, depending on the state of domicile, either ten percent of an insurer's statutory surplus with respect to policyholders as of the preceding year end or the statutory net gain from operations, excluding realized investment gains and losses, of the preceding year. The payment of dividends to a parent company from a life insurance subsidiary is generally further limited to the amount of unassigned funds.

Based on the restrictions under current law, $591.0 million is available, without prior approval by regulatory authorities, during 2014 for the payment of dividends to Unum Group from its traditional U.S. life insurance subsidiaries. The ability of our captive insurers to pay dividends to their respective parent companies will depend on their satisfaction of applicable regulatory requirements and on the performance of the business reinsured.

We also have the ability to receive dividends from Unum Limited, subject to applicable insurance company regulations and capital guidance in the United Kingdom. Approximately £187.8 million is available for the payment of dividends from Unum Limited during 2014, subject to regulatory approval.

Deposits

At December 31, 2013 and 2012, our U.S. insurance subsidiaries had on deposit with U.S. regulatory authorities securities with a book value of $280.5 million and $277.5 million, respectively, held for the protection of policyholders.

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Investments Mortgage Loan Restructuring (Detail) (Commercial Real Estate Portfolio Segment [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 4.3	$ 17.3	$ 19.9
Number of Trouble Debt Modifications Entered Into During Period	1	3	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0	3.2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0.2
Financing Receivable, Modifications, Number of Contracts	0	0	1

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Stock-Based Compensation - Nonvested Stock Awards Classified in Equity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value of Shares Granted	$ 23.97
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding Beginning Balance	1,403
Shares Granted	731
Shares Vested	(790)
Shares Forfeited	(22)
Shares Outstanding Ending Balance	1,322	1,403
Weighted Average Grant Date Fair Value at Beginning of Period	$ 23.57
Weighted Average Grant Date Fair Value of Shares Granted	$ 24.68	$ 22.96	$ 26.13
Weighted Average Grant Date Fair Value of Shares Vested	$ 23.12
Weighted Average Grant Date Fair Value of Shares Forfeited	$ 24.22
Weighted Average Grant Date Fair Value at End of Period	$ 24.35	$ 23.57
Cash Settled Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding Beginning Balance	207
Shares Granted	60
Shares Vested	(102)
Shares Outstanding Ending Balance	165	207
Weighted Average Grant Date Fair Value at Beginning of Period	$ 23.72
Weighted Average Grant Date Fair Value of Shares Granted	$ 24.22	$ 23.23	$ 26.22
Weighted Average Grant Date Fair Value of Shares Vested	$ 23.29
Weighted Average Grant Date Fair Value at End of Period	$ 24.09	$ 23.72

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2010		$ 36.5	$ 2,615.4	$ 351.4	$ 6,591.8	$ (1,110.2)
Common Stock Activity		0.2	30.9
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
Total Other Comprehensive Income (Loss)	110.4			110.4
Net Income	284.2				284.2
Dividends to Stockholders (per common share: $0.550; $0.470; $0.395)					(121.0)
Purchases of Treasury Stock						(419.9)
Balance at End of Period at Dec. 31, 2011	8,169.7	35.9	2,591.1	461.8	6,611.0	(1,530.1)
Common Stock Activity		0.1	16.6
Retirement of Repurchased Common Shares		0	0		0
Total Other Comprehensive Income (Loss)	166.2			166.2
Net Income	894.4				894.4
Dividends to Stockholders (per common share: $0.550; $0.470; $0.395)					(133.8)
Purchases of Treasury Stock						(500.6)
Balance at End of Period at Dec. 31, 2012	8,612.6	36.0	2,607.7	628.0	7,371.6	(2,030.7)
Common Stock Activity		0.1	26.4
Retirement of Repurchased Common Shares		0	0		0
Total Other Comprehensive Income (Loss)	(373.0)			(373.0)
Net Income	858.1				858.1
Dividends to Stockholders (per common share: $0.550; $0.470; $0.395)					(146.5)
Purchases of Treasury Stock						(318.6)
Balance at End of Period at Dec. 31, 2013	$ 8,659.1	$ 36.1	$ 2,634.1	$ 255.0	$ 8,083.2	$ (2,349.3)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Fixed Maturity Securities, Amortized Cost	$ 38,289.6	$ 37,751.5
Stockholders' Equity
Common Stock, Par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	360,802,426	359,751,943
Treasury Stock, Shares	100,785,012	89,546,758

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Debt

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Senior Secured Notes, variable due 2037, callable at or above par	$	440.0		$	500.0
Senior Secured Notes, variable due 2036, callable at or above par	—			62.5
Notes @ 5.75% due 2042, callable at or above par	248.6			248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 6.85% due 2015, callable at or above par	296.8			296.7
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	2,612.0			2,755.4
Short-term Debt
Securities Lending Agreements - See Note 3	76.5			455.8
Total	$	2,688.5		$	3,211.2

Collateralized debt is comprised of our senior secured notes and ranks highest in priority, followed by unsecured notes, which consist of notes and medium-term notes, followed by junior subordinated debt securities. The junior subordinated debt securities due 2038 are callable under limited, specified circumstances. The remaining callable debt may be redeemed, in whole or in part, at any time.

The aggregate contractual principal maturities are $296.9 million in 2015, $350.0 million in 2016, $200.0 million in 2018, and $1,772.6 million in 2020 and thereafter.

Senior Secured Notes

In 2007, Northwind Holdings, LLC (Northwind Holdings), a wholly-owned subsidiary of Unum Group, issued $800.0 million of insured, senior secured notes due 2037 (the Northwind notes) in a private offering. The Northwind notes bear interest at a floating rate equal to the three-month LIBOR plus 0.78%.

Northwind Holdings’ ability to meet its obligations to pay principal, interest, and other amounts due on the Northwind notes will be dependent principally on its receipt of dividends from Northwind Reinsurance Company (Northwind Re), the sole subsidiary of Northwind Holdings. Northwind Re reinsured the risks attributable to specified individual disability insurance policies issued by or reinsured by Provident Life and Accident Insurance Company, Unum Life Insurance Company of America, and The Paul Revere Life Insurance Company (collectively, the ceding insurers) pursuant to separate reinsurance agreements between Northwind Re and each of the ceding insurers. The ability of Northwind Re to pay dividends to Northwind Holdings will depend on its satisfaction of applicable regulatory requirements and the performance of the reinsured policies.

Recourse for the payment of principal, interest, and other amounts due on the Northwind notes is limited to the collateral for the Northwind notes and the other assets, if any, of Northwind Holdings. The collateral consists of a first priority, perfected security interest in (a) the debt service coverage account (DSCA) that Northwind Holdings is required to maintain in accordance with the indenture pursuant to which the Northwind notes were issued (the Northwind indenture), (b) the capital stock of Northwind Re and the dividends and distributions on such capital stock, and (c) Northwind Holdings' rights under the transaction documents related to the Northwind notes to which Northwind Holdings is a party. At December 31, 2013, the amount in the DSCA was $7.4 million. None of Unum Group, the ceding insurers, Northwind Re, or any other affiliate of Northwind Holdings is an obligor or guarantor with respect to the Northwind notes.

Northwind Holdings is required to repay a portion of the outstanding principal under the Northwind notes at par on the quarterly scheduled payment dates under the Northwind notes in an amount equal to the lesser of (i) a targeted amortization amount as defined in the Northwind indenture and (ii) the amount of the remaining available funds in the DSCA minus an amount equal to the minimum balance that is required to be maintained in the DSCA under the Northwind indenture, provided that Northwind Holdings has sufficient funds available to pay its other expenses, including interest payments on the Northwind notes, and to maintain the minimum balance in the DSCA as required under the Northwind indenture. Northwind Holdings made principal payments on the Northwind Notes of $60.0 million in both 2013 and 2012 and $74.4 million in 2011.

In 2006, Tailwind Holdings, LLC (Tailwind Holdings) a wholly-owned subsidiary of Unum Group, issued $130.0 million of insured, senior, secured notes due 2036 in a private offering. During 2012 and 2011, Tailwind Holdings made principal payments of $10.0 million each year on these notes. In January 2013, we purchased and retired the outstanding principal of $62.5 million on these notes, resulting in a before-tax gain of $4.0 million.

Unsecured Notes

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering.

In 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

In 2005, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued 6.85% senior debentures due 2015. These debentures are fully and unconditionally guaranteed by Unum Group.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $600.0 million notional amount interest rate swaps which effectively convert certain of our unsecured senior notes into floating rate debt. Under these agreements, we receive fixed rates of interest and pay variable rates of interest, based off of three-month LIBOR. See Note 4 for further information on our interest rate swaps.

Junior Subordinated Debt Securities

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures to the trust in connection with the capital securities offering. The debentures mature in 2038. The sole assets of the trust are the junior subordinated debt securities.

Interest and Debt Expense

Interest paid on long-term and short-term debt and related securities during 2013, 2012, and 2011 was $144.6 million, $139.6 million, and $145.4 million, respectively.

Credit Facility

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600.0 million. Borrowings under the credit facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility provides for interest rates based on either the prime rate or LIBOR. At December 31, 2013, no amount was outstanding on the facility.

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Employee Benefit Plans - Additional Information (Detail)	12 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended										12 Months Ended										12 Months Ended		12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2012 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2013 Pension Benefits, Non U.S. Plans USD ($) Rate	Sep. 30, 2013 Pension Benefits, Non U.S. Plans Rate	Dec. 31, 2013 Pension Benefits, Non U.S. Plans USD ($) Rate	Dec. 31, 2013 Pension Benefits, Non U.S. Plans GBP (£)	Dec. 31, 2012 Pension Benefits, Non U.S. Plans USD ($) Rate	Dec. 31, 2012 Pension Benefits, Non U.S. Plans GBP (£)	Dec. 31, 2011 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, Non U.S. Plans GBP (£)	Dec. 31, 2013 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2012 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2011 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2009 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2013 Equity Securites Pension Benefits, U.S. Plans	Dec. 31, 2013 Equity Securites Pension Benefits, Non U.S. Plans	Dec. 31, 2013 Fixed Maturity Securities Pension Benefits, U.S. Plans	Dec. 31, 2013 Alternative Investments Pension Benefits, U.S. Plans	Dec. 31, 2013 Other Investments Pension Benefits, Non U.S. Plans	Dec. 31, 2013 Minimum Private Equity Funds Pension Benefits, U.S. Plans	Dec. 31, 2013 Maximum Private Equity Funds Pension Benefits, U.S. Plans Integer	Dec. 31, 2013 After Pension Amendment [Member] Pension Benefits, U.S. Plans	Dec. 31, 2013 After Pension Amendment [Member] Pension Benefits, Non U.S. Plans GBP (£) Rate	Dec. 31, 2012 Prior to Pension Amendments [Member] Pension Benefits, U.S. Plans	Dec. 31, 2012 Prior to Pension Amendments [Member] Pension Benefits, Non U.S. Plans	Dec. 31, 2013 After Pension Amendment [Member] Pension Benefits, U.S. Plans	Dec. 31, 2013 After Pension Amendment [Member] Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure
Assumptions Used Calculating Benefit Obligation, Discount Rate		5.30%	4.50%		4.40%		4.40%	4.40%	4.50%	4.50%			5.00%	4.20%												4.50%		5.00%	4.60%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		7.50%	7.50%						5.80%	5.80%			5.75%	5.75%													6.20%		6.35%
Incremental Effect on Balance Sheet, Liability or Equity Line Item Change Due to Additional Minimum Pension Liability (AML) Adjustment, Period Increase (Decrease)		$ (327,400,000)					$ (2,300,000)	£ (1,500,000)
Curtailments (Tax Impact)		(114,600,000)
Recognized Net Gain (Loss) Due to Curtailments		(700,000)	0	0			3,700,000	2,300,000	0		0		0	0	0
Maximum Inflation Rate on Pensionable Earnings					2.50%		2.50%	2.50%	5.00%	5.00%
Defined Benefit Plan, Curtailments		126,800,000	0				3,700,000		0				0	4,200,000
Defined Benefit Plan Amendments - Benefit Obligation Impact		0	0				0		0				0	5,000,000
Average Remaining Life Expectancy of Plan Participants							11 years	11 years
Target Plan Asset Allocations																	60.00%	75.00%	30.00%	10.00%	25.00%
Private equity funds, number of years to maturity																						5	8
Level 3 Transfers Into													0	0
Level 3 Transfers Out of													0	0
Interest Rate During Period													5.58%	5.77%
Health Care Cost Trend Rate Assumed for Next Fiscal Year													7.50%	8.00%
Ultimate Health Care Cost Trend Rate													5.00%
Effect of One Percentage Point Increase on Service and Interest Cost Components													200,000
Effect of One Percentage Point Decrease on Service and Interest Cost Components													(100,000)
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation													2,400,000
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation													(1,700,000)
Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax		0	600,000		0		0		200,000				(2,400,000)	(7,300,000)		4,400,000
Gross Prescription Drug Subsidy Receipts Received													1,200,000	1,300,000	1,300,000
Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	(5,600,000)												1,700,000
Amount that will be recognized from AOCI to Income, after tax	(3,700,000)												1,100,000
General Discussion of Pension and Other Postretirement Benefits		We had no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013
Pension Contributions		50,000,000					4,000,000	2,500,000
Pension Plan Contributions, Percent of Pensionable Earnings					30.00%	24.80%
Estimated Future Employer Contributions in Current Fiscal Year							2,300,000	1,400,000
Employer Matching Contribution, Percent of Employees' Gross Pay		3.00%					5.00%	5.00%																5.00%	5.00%
Employer Matching Contribution on amts over 3%		0.50
Employer Matching Contribution % for $0.50		2.00%
Employer Discretionary Contribution Percentage of earnings							5.00%	5.00%																4.50%	6.00%
Employer Matching Contribution for Every Pound on the First One Percent of Employee Contributions																									2
Employee Contribution Percentage Received 2-for-1 Employer Match																									1.00%
Cost Recognized		$ 18,800,000	$ 18,900,000	$ 18,800,000			$ 2,900,000	£ 1,900,000	$ 2,900,000	£ 1,800,000	$ 2,600,000	£ 1,600,000

XML

Employee Benefit Plans Net Periodic Benefit Cost (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2012 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2013 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Pension Benefits, Non U.S. Plans GBP (£)	Dec. 31, 2012 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2012 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2011 Other Postretirement Benefit Plans USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service Cost	$ 59.4	$ 48.8	$ 42.7	$ 4.3		$ 4.2	$ 4.8	$ 0.7	$ 1.6	$ 1.9
Interest Cost	86.3	84.4	77.6	8.6		8.5	8.8	8.0	9.6	10.0
Expected Return on Plan Assets	(105.5)	(88.8)	(87.6)	(12.5)		(11.1)	(12.2)	(0.6)	(0.7)	(0.7)
Amortization of Net Actuarial Loss	31.7	45.9	31.9	1.2		0.5	0	0	0	0
Amortization of Prior Service Cost (Credit)	(0.1)	(0.4)	(0.5)	0		0	0	(4.9)	(2.6)	(2.6)
Recognized Net Gain (Loss) Due to Curtailments	0.7	0	0	(3.7)	(2.3)	0	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 72.5	$ 89.9	$ 64.1	$ (2.1)		$ 2.1	$ 1.4	$ 3.2	$ 7.9	$ 8.6

XML

Debt - Additional Information Domain (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended				3 Months Ended	12 Months Ended												12 Months Ended
	Dec. 31, 2013 Integer	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Northwind Holdings LLC [Member]	Dec. 31, 2013 Northwind Holdings LLC [Member]	Dec. 31, 2012 Northwind Holdings LLC [Member]	Dec. 31, 2011 Northwind Holdings LLC [Member]	Dec. 31, 2007 Northwind Holdings LLC [Member]	Dec. 31, 2013 Tailwind Holdings LLC [Member]	Dec. 31, 2012 Tailwind Holdings LLC [Member]	Dec. 31, 2006 Tailwind Holdings LLC [Member]	Dec. 31, 2013 Notes 5 Point 750 Due 2042 Callable At or Above Par [Member]	Dec. 31, 2012 Notes 5 Point 750 Due 2042 Callable At or Above Par [Member]	Dec. 31, 2013 Notes 6 Point 85 Percent due 2015 callable at or above par [Member]	Dec. 31, 2013 Junior Subordinated Debt Securities 7 Point 405 Percent due 2038 [Member]	Dec. 31, 1998 Junior Subordinated Debt Securities 7 Point 405 Percent due 2038 [Member]	Dec. 31, 2011 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member]	Dec. 31, 2011 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member] Medium-term Notes 7 Point 0 Percent to 7 Point 2 Percent due 2023 to 2028 noncallable [Member]	Dec. 31, 2013 Notes 7 Point 625 Percent due 2011 callable at or above par, current portion [Member] Medium-term Notes 7 Point 0 Percent to 7 Point 2 Percent due 2023 to 2028 noncallable [Member]	Dec. 31, 2013 Receive Fixed/Pay Variable Swap [Member]	Dec. 31, 2012 Receive Fixed/Pay Variable Swap [Member]	Dec. 31, 2011 Receive Fixed/Pay Variable Swap [Member]	Dec. 31, 2010 Receive Fixed/Pay Variable Swap [Member]
Debt Narrative Detail Information [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 296.9
Long-term Debt, Maturities, Repayments of Principal in Year Three	350.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	200.0
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,772.6
Proceeds from Issuance of Senior Long-term Debt									800.0			130.0
Debt Instrument, Basis Spread on Variable Rate					0.78%
Debt service coverage account (DSCA)					7.4	7.4
Debt Instrument, Periodic Payment, Principal						60.0	60.0	74.4		10.0	10.0
Repayments of Long-term Debt	116.2	70.0	84.4							62.5
Gains (Losses) on Extinguishment of Debt										4.0
Proceeds from Unsecured Notes Payable													250.0	250.0
Repayments of Medium-term Notes																		225.1	225.1
Percentage_ownership_of_Unum_to_PFT																	100.00%
Liquidation value per capital security																$ 1,000	$ 1,000
Debt Instrument, Interest Rate, Stated Percentage															6.85%	7.405%	7.405%	7.625%		7.625%
Derivative, Notional Amount	1,477.4	1,432.8	1,413.0	1,681.9																	600.0	750.0	685.0	890.0
Interest Paid	144.6	139.6	145.4
LineofCreditFacilityTermPeriod	5
Line of Credit Facility, Maximum Borrowing Capacity	400.0
Line Of Credit Facility Maximum Borrowing Capacity If Requested	600.0
Line of Credit Facility, Amount Outstanding	$ 0

XML

Combined Statutory Capital and Surplus (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
United States Traditional Insurance Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory Combined Capital and Surplus	$ 3,450.5	$ 3,426.5
CaptiveReinsurers [Domain]
Statutory Accounting Practices [Line Items]
Statutory Combined Capital and Surplus	$ 1,679.4	$ 1,765.3

XML

Parent Company Debt Schedule (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 2,612.0	$ 2,755.4
Debt, Long-term and Short-term, Combined Amount	2,688.5	3,211.2
Notes Due 2042
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Long-term Debt	248.6	248.6
Notes Payable Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Long-term Debt	39.5	39.5
Notes at 6 Point 75 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Long-term Debt	165.8	165.8
Notes 7 Point 25 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%
Long-term Debt	200.0	200.0
Notes Payable Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Long-term Debt	399.7	399.6
Notes Payable Due 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.125%
Long-term Debt	350.0	350.0
Notes Payable Due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Long-term Debt	200.0	200.0
Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Long-term Debt	50.8	50.8
Junior Subordinated Debt Securities Due 2038
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.405%
Long-term Debt	226.5	226.5
Parent Company
Debt Instrument [Line Items]
Long-term Debt	1,875.2	1,896.2
Debt, Long-term and Short-term, Combined Amount	1,875.5	1,902.8
Parent Company | Notes Due 2042
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Long-term Debt	248.6	248.6
Parent Company | Notes Payable Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Long-term Debt	39.5	39.5
Parent Company | Notes at 6 Point 75 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Long-term Debt	165.8	165.8
Parent Company | Notes 7 Point 25 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Long-term Debt	200.0	200.0
Parent Company | Notes Payable Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Long-term Debt	399.7	399.6
Parent Company | Notes Payable Due 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.125%
Long-term Debt	350.0	350.0
Parent Company | Notes Payable Due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Long-term Debt	200.0	200.0
Parent Company | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Long-term Debt	50.8	50.8
Parent Company | Junior Subordinated Debt Securities Due 2038
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.405%
Long-term Debt	226.5	226.5
Parent Company | Fair Value Hedge Adjustment, LT Debt
Debt Instrument [Line Items]
Long-term Debt	(5.7)	15.4
Securities Pledged as Collateral
Debt Instrument [Line Items]
Short-term Debt	76.5	455.8
Securities Pledged as Collateral | Parent Company
Debt Instrument [Line Items]
Short-term Debt	$ 0.3	$ 6.6
Minimum | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Minimum | Parent Company | Notes Payable Due 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Minimum | Parent Company | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Maximum | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.20%
Maximum | Parent Company | Notes Payable Due 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%
Maximum | Parent Company | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.20%

XML

Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 59,403.6	$ 62,236.1
Unum U.S.
Segment Reporting Information [Line Items]
Assets	18,384.3	19,391.2
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,654.1	3,975.8
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,482.9	3,434.9
Closed Block
Segment Reporting Information [Line Items]
Assets	31,564.2	33,069.2
Corporate
Segment Reporting Information [Line Items]
Assets	$ 2,318.1	$ 2,365.0

XML

Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Feb. 24, 2014	Jun. 30, 2013
Entity Registrant Name	Unum Group
Trading Symbol	UNM
Entity Central Index Key	0000005513
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		259,447,820
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7.7

XML

Schedule of Unaudited Quarterly Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premium Income	$ 1,890.7	$ 1,897.3	$ 1,905.8	$ 1,930.9	$ 1,937.2	$ 1,929.4	$ 1,927.6	$ 1,921.9	$ 7,624.7	$ 7,716.1	$ 7,514.2
Net Investment Income	629.4	615.5	626.1	621.1	643.0	619.2	633.5	619.5	2,492.1	2,515.2	2,519.6
Net Realized Investment Gain (Loss)	9.3	(26.1)	13.3	10.3	24.6	21.3	(2.1)	12.4	6.8	56.2	(4.9)
Total Revenue	2,586.2	2,540.9	2,601.9	2,624.8	2,658.2	2,628.0	2,617.9	2,611.3	10,353.8	10,515.4	10,278.0
Income Before Income Tax	305.8	284.1	311.5	303.8	322.7	320.4	296.4	310.0	1,205.2	1,249.5	333.3
Net Income	$ 221.2	$ 205.7	$ 218.6	$ 212.6	$ 233.9	$ 230.2	$ 216.4	$ 213.9	$ 858.1	$ 894.4	$ 284.2
Earnings Per Share, Basic	$ 0.85	$ 0.78	$ 0.82	$ 0.79	$ 0.86	$ 0.83	$ 0.76	$ 0.74	$ 3.24	$ 3.18	$ 0.94
Earnings Per Share, Diluted	$ 0.84	$ 0.78	$ 0.82	$ 0.79	$ 0.85	$ 0.83	$ 0.76	$ 0.73	$ 3.23	$ 3.17	$ 0.94

XML

Employee Benefit Plans

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

Note 9 - Employee Benefit Plans

Defined Benefit Pension and Other Postretirement Benefit Plans

We sponsor several defined benefit pension and other postretirement benefit (OPEB) plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, and the U.K. plan was closed to new entrants on December 31, 2002.

Amendments to U.S. Pension Plans

In 2013, we adopted plan amendments which freeze participation and benefit accruals in our U.S. qualified and non-qualified defined benefit pension plans, effective December 31, 2013. Because the amendments eliminate all future service accruals subsequent to December 31, 2013 for active participants in these plans, we were required to remeasure the benefit obligations during 2013. The discount rate assumption increased from 4.50 percent at December 31, 2012 to 5.00 percent at the remeasurement date, reflecting the change in market interest rates during that period. The expected long-term rate of return on plan assets of 7.50 percent remained unchanged from December 31, 2012. The remeasurement resulted in a decrease in our net pension liability of $327.4 million at the remeasurement date, with a corresponding increase in other comprehensive income, less applicable income tax of $114.6 million. The decrease in the net pension liability resulted primarily from the curtailment of benefits under the plan amendments as well as the increase in the discount rate assumption used to remeasure the benefit obligations.

As a result of these plan amendments, we recognized a before-tax curtailment loss of $0.7 million in earnings during 2013, with a corresponding reduction in the prior service cost included in accumulated other comprehensive income and associated with years of service no longer expected to be rendered.

Amendments to U.K. Pension Plan

In 2013, we adopted amendments to our U.K. pension plan which freeze participation in our plan and which reduce the maximum rate of inflation indexation from 5.0 percent to 2.5 percent for pension benefits which were earned prior to April 1997. The amendment to reduce the maximum rate of inflation indexation was effective September 12, 2013, and the amendment to freeze participation will become effective June 30, 2014. Although all future service accruals will be eliminated for active participants, pension payments to participants currently employed will be based on the higher of (i) pensionable earnings at a participant's retirement age or the date a participant's employment ceases, subject to the inflation indexation provisions in the plan, or (ii) pensionable earnings as of June 30, 2014, also subject to the inflation indexation provisions. Because the amendments eliminate all future service accruals subsequent to June 30, 2014 for active participants in the plan, we were required to remeasure the benefit obligation of the plan during 2013. The discount rate assumption increased from 4.50 percent at December 31, 2012 to 4.60 percent at the remeasurement date, reflecting the change in market interest rates during that period. The expected long-term rate of return on plan assets changed from 6.20 percent at December 31, 2012 to 6.35 percent at the remeasurement date. The remeasurement resulted in a $2.3 million, or £1.5 million, increase in our net pension asset at the remeasurement date.

As a result of these plan amendments, we recognized a before-tax curtailment gain of $3.7 million, or £2.3 million, in earnings during 2013, with a corresponding decrease in the prior service credit included in accumulated other comprehensive income and associated with years of service no longer expected to be rendered. The majority of the prior service credit was related to the amendment to reduce the rate of inflation indexation.

Amendments to OPEB Plan

We discontinued offering retiree life insurance to future retirees effective December 31, 2012 but continue to provide this benefit to employees who retired prior to that date. As a result of this plan amendment, we recognized a curtailment gain of $4.2 million and a prior service credit of $5.0 million in accumulated other comprehensive income during 2012.

Amortization Period of Actuarial Gain or Loss

Because all participants in the U.S. and U.K. pension plans are considered inactive as a result of these amendments, we are required to amortize the net actuarial loss for these plans over the average remaining life expectancy of the plan participants. The net actuarial loss was previously amortized over the average future working life of pension plan participants, or approximately 11 years, for both U.S. and U.K. participants up to the dates of remeasurement. As of December 31, 2013, the estimate of the average remaining life expectancy of plan participants is approximately 33 years for U.S. participants and 34 years for U.K. participants.

The following tables provide the changes in the benefit obligation and fair value of plan assets and statements of the funded status of the plans.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Change in Benefit Obligation
Benefit Obligation at Beginning of Year	$	1,967.9		$	1,579.8		$	197.4		$	170.4		$	198.8		$	190.9
Service Cost	59.4			48.8			4.3			4.2			0.7			1.6
Interest Cost	86.3			84.4			8.6			8.5			8.0			9.6
Plan Participant Contributions	—			—			—			—			3.9			3.5
Actuarial (Gain) Loss	(225.9		)	291.4			2.6			9.4			(30.2		)	19.1
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Plan Amendment	—			—			—			—			—			(5.0		)
Curtailment	(126.8		)	—			(3.7		)	—			—			(4.2		)
Change in Foreign Exchange Rates	—			—			3.6			8.8			—			—
Benefit Obligation at End of Year	$	1,718.7		$	1,967.9		$	208.7		$	197.4		$	165.3		$	198.8
Accumulated Benefit Obligation at December 31	$	1,718.7		$	1,822.3		$	197.7		$	187.3		N/A			N/A
Change in Fair Value of Plan Assets
Fair Value of Plan Assets at Beginning of Year	$	1,353.6		$	1,170.8		$	205.6		$	188.0		$	11.5		$	11.7
Actual Return on Plan Assets	224.6			161.8			15.6			8.6			0.2			0.3
Employer Contributions	54.7			57.5			4.0			4.1			11.7			12.7
Plan Participant Contributions	—			—			—			—			3.9			3.5
Benefits and Expenses Paid	(42.2		)	(36.5		)	(4.1		)	(3.9		)	(15.9		)	(16.7		)
Change in Foreign Exchange Rates	—			—			4.6			8.8			—			—
Fair Value of Plan Assets at End of Year	$	1,590.7		$	1,353.6		$	225.7		$	205.6		$	11.4		$	11.5
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9		$	187.3

The amounts recognized in our consolidated balance sheets for our pension and OPEB plans at December 31, 2013 and 2012 are as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013		2012
	(in millions of dollars)
Current Liability	$	5.2		$	4.6		$	—		$	—		$	14.6	$	15.6
Noncurrent Liability	136.2			609.7			—			—			139.3		171.7
Noncurrent Asset	(13.4		)	—			(17.0		)	(8.2		)	—		—
Underfunded (Overfunded) Status	$	128.0		$	614.3		$	(17.0	)	$	(8.2	)	$	153.9	$	187.3
Unrecognized Pension and Postretirement Benefit Costs
Net Actuarial Gain (Loss)	$	(342.1	)	$	(845.4	)	$	(36.9	)	$	(37.9	)	$	10.3	$	(19.3	)
Prior Service Credit (Cost)	—			(0.6		)	—			(0.2		)	2.4		7.3
	(342.1		)	(846.0		)	(36.9		)	(38.1		)	12.7		(12.0		)
Deferred Income Tax Asset	119.7			296.1			10.9			11.1			5.8		14.4
Total Included in Accumulated Other Comprehensive Income (Loss)	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5	$	2.4

The following table provides the changes recognized in other comprehensive income for the years ended December 31, 2013 and 2012.

	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Accumulated Other Comprehensive Income (Loss) at Beginning of Year	$	(549.9	)	$	(437.6	)	$	(27.0	)	$	(17.2	)	$	2.4		$	10.7
Net Actuarial Gain (Loss)
Amortization	31.7			45.9			1.2			0.5			—			—
Curtailment	126.8			—			—			—			—			4.2
All Other Changes	344.8			(218.2		)	(0.2		)	(13.4		)	29.6			(19.4		)
Prior Service Credit (Cost)
Amortization	(0.1		)	(0.4		)	—			—			(4.9		)	(2.6		)
Curtailment	0.7			—			(3.7		)	—			—			—
Plan Amendment	—			—			3.9			—			—			5.0
Change in Deferred Income Tax Asset	(176.4		)	60.4			(0.2		)	3.1			(8.6		)	4.5
Accumulated Other Comprehensive Income (Loss) at End of Year	$	(222.4	)	$	(549.9	)	$	(26.0	)	$	(27.0	)	$	18.5		$	2.4

Plan Assets

The objective of our U.S. pension and OPEB plans is to maximize long-term return, within acceptable risk levels, in a manner that is consistent with the fiduciary standards of the Employee Retirement Income Security Act (ERISA), while maintaining sufficient liquidity to pay current benefits and expenses.

Assets for our U.S. pension plans include a diversified blend of domestic and international large cap, mid cap, and small cap equity securities, U.S. government and agency fixed income securities, corporate fixed income securities, private equity direct investments, private equity funds of funds, hedge funds of funds, and cash equivalents. The large cap and mid cap equity securities are comprised of equity index funds that are designed to track the Standard & Poor's (S&P) 500 and S&P 400 Mid Cap indices, respectively. Small cap equity securities consist of individual equity securities that track the Russell 2000 index. International equity investments consist of equity funds that are benchmarked against either the Morgan Stanley Capital International (MSCI) Europe Australasia Far East Index or the MSCI All Country World Index Excluding U.S. These international funds may allocate a certain percentage of their assets to forward currency contracts. Emerging market equity investments consist of funds that are benchmarked against the MSCI Emerging Markets Index. U.S. government and agency fixed income securities are comprised of treasury bonds and U.S. agency asset-backed securities. Corporate fixed income securities consist of investment-grade and below-investment-grade corporate bonds as well as certain asset-backed securities. Alternative investments, which include private equity direct investments, private equity funds of funds, and hedge funds of funds, utilize proprietary strategies that are intended to have a low correlation to the U.S. stock market. The target allocations for invested assets are 60 percent equity securities, 30 percent fixed income securities, and 10 percent alternative investments. Prohibited investments include, but are not limited to, unlisted securities, futures contracts, options, short sales, and investments in securities issued by the Company or its affiliates.

Assets for our U.K. pension plan are primarily invested in a pooled diversified growth fund. This fund invests in assets such as global equities, hedge funds, commodities, below-investment-grade fixed income securities, and currencies. The objectives of the fund are to generate capital appreciation over the course of a complete economic and market cycle and to deliver equity-like returns in the medium-to-long term while maintaining approximately two thirds of the volatility of equity markets. Performance of this fund is measured against the U.K. inflation rate plus four percent. The remaining assets in the U.K. plan are invested in leveraged interest rate and inflation swap funds of varying durations designed to broadly match the interest rate and inflation sensitivities of the plan's liabilities. The current target allocation for the assets is 75 percent diversified growth assets and 25 percent interest rate and inflation swap funds. There are no categories of investments that are specifically prohibited by the U.K. plan, but there are general guidelines that ensure prudent investment action is taken. Such guidelines include the prevention of the plan from using derivatives for speculative purposes and limiting the concentration of risk in any one type of investment.

Assets for life insurance benefits payable to certain former retirees covered under the OPEB plan are invested in life insurance contracts issued by one of our insurance subsidiaries. The terms of these contracts are consistent in all material respects with those the subsidiary offers to unaffiliated parties that are similarly situated. There are no categories of investments specifically prohibited by the OPEB plan.

We believe our investment portfolios are well diversified by asset class and sector, with no potential risk concentrations in any one category.

The categorization of fair value measurements by input level for the invested assets in our U.S. pension plans is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	343.9	$	—	$	343.9
U.S. Mid Cap	—		139.6		—		139.6
U.S. Small Cap	231.9		—		—		231.9
International	134.5		131.7		—		266.2
Emerging Markets	—		76.3		—		76.3
Fixed Income Securities:
U.S. Government and Agencies	105.7		7.4		—		113.1
Corporate	97.8		172.6		—		270.4
State and Municipal Securities	—		12.9		—		12.9
Alternative Investments:
Private Equity Direct Investments	—		—		7.2		7.2
Private Equity Funds of Funds	—		—		29.6		29.6
Hedge Funds of Funds	—		—		66.9		66.9
Cash Equivalents	28.4		—		—		28.4
Total	$	598.3	$	884.4	$	103.7	$	1,586.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Invested Assets
Equity Securities:
U.S. Large Cap	$	—	$	269.2	$	—	$	269.2
U.S. Mid Cap	—		111.6		—		111.6
U.S. Small Cap	83.9		120.1		—		204.0
International	106.4		102.9		—		209.3
Emerging Markets	—		73.9		—		73.9
Fixed Income Securities:
U.S. Government and Agencies	138.0		8.6		—		146.6
Corporate	84.1		141.7		—		225.8
State and Municipal Securities	—		12.7		—		12.7
Alternative Investments:
Private Equity Funds of Funds	—		—		28.7		28.7
Hedge Funds of Funds	—		—		56.1		56.1
Cash Equivalents	13.1		—		—		13.1
Total	$	425.5	$	840.7	$	84.8	$	1,351.0

Level 1 equity and fixed income securities consist of individual holdings and funds that are valued based on unadjusted quoted prices from active markets for identical securities. Level 2 equity securities consist of funds that are valued based on the net asset value (NAV) of the underlying holdings. These investments have no unfunded commitments and no specific redemption restrictions. Level 2 fixed income securities are valued using observable inputs through market corroborated pricing.

Alternative investments, which include private equity direct investments, hedge funds of funds, and private equity funds of funds, are valued based on the NAV of the underlying holdings in a period ranging from one month to one quarter in arrears. We evaluate the need for adjustments to the NAV based on market conditions and discussions with fund managers in the period subsequent to the valuation date and prior to issuance of the financial statements. We made no adjustments to the NAV for 2013 or 2012. Redemptions on the hedge funds of funds can be made on either a quarterly or bi-annual basis, depending on the fund, with prior notice of at least 90 calendar days. Because of these redemption restrictions, we have classified the hedge funds of funds as Level 3 because we do not have the unrestricted ability to redeem our investment at NAV at any given time. The private equity funds of funds cannot be redeemed by investors, and distributions are received following the maturity of the underlying assets. It is estimated that these underlying assets will begin to mature between five and eight years from the date of initial investment. Accordingly, we have assigned a Level 3 classification to the private equity funds of funds due to the redemption restrictions.

Changes in our U.S. pension plans' assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Direct Investments	$	—	$	0.3	$	—	$	8.4	$	(1.5	)	$	—	$	—	$	7.2
Private Equity Funds of Funds	28.7		0.9		1.1		2.1		(3.2		)	—		—		29.6
Hedge Funds of Funds	56.1		6.3		—		4.9		(0.4		)	—		—		66.9
Total	$	84.8	$	7.5	$	1.1	$	15.4	$	(5.1	)	$	—	$	—	$	103.7

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets				Purchases		Sales			Level 3 Transfers				End of Year
			Held at Year End		Sold During the Year							Into		Out of
	(in millions of dollars)
Private Equity Funds of Funds	$	23.7	$	0.5	$	1.0	$	6.0	$	(2.5	)	$	—	$	—	$	28.7
Hedge Funds of Funds	44.3		3.8		—		11.8		(3.8		)	—		—		56.1
Total	$	68.0	$	4.3	$	1.0	$	17.8	$	(6.3	)	$	—	$	—	$	84.8

The categorization of fair value measurements by input level for the assets in our U.K. pension plan is as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	172.0	$	—	$	172.0
Fixed Interest and Index-linked Securities	52.6		0.4		—		53.0
Cash Equivalents	0.7		—		—		0.7
Total Plan Assets	$	53.3	$	172.4	$	—	$	225.7

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Plan Assets
Diversified Growth Assets	$	—	$	154.7	$	—	$	154.7
Fixed Interest and Index-linked Securities	42.6		0.9		—		43.5
Cash Equivalents	7.4		—		—		7.4
Total Plan Assets	$	50.0	$	155.6	$	—	$	205.6

Level 1 fixed interest and index-linked securities consist of individual funds that are valued based on unadjusted quoted prices from active markets for identical securities. Level 2 assets consist of funds that are valued based on the NAV of the underlying holdings. These investments have no unfunded commitments and no specific redemption restrictions.

The categorization of fair value measurements by input level for the assets in our OPEB plan is as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.4	$	11.4

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Life Insurance Contracts	$	—	$	—	$	11.5	$	11.5

The fair value is represented by the actuarial present value of future cash flows of the contracts.

Changes in our OPEB plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 31, 2013
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.5	$	0.2	$	15.6	$	(15.9	)	$	11.4

	Year Ended December 31, 2012
	Beginning of Year		Actual Return on Plan Assets		Contributions		Net Benefits and Expenses Paid			End of Year
	(in millions of dollars)
Life Insurance Contracts	$	11.7	$	0.3	$	16.2	$	(16.7	)	$	11.5

For the years end December 31, 2013 and 2012, the actual return on plan assets relates solely to investments still held at the reporting date. There were no transfers into or out of Level 3 during 2013 or 2012.

Measurement Assumptions

We use a December 31 measurement date for each of our plans. The weighted average assumptionsused in the measurement of our benefit obligations as of December 31 and our net periodic benefit costs for the years ended December 31 are as follows:

	Pension Benefits
	U.S. Plans				Non U.S. Plans				OPEB
	2013		2012		2013		2012		2013		2012
Benefit Obligations
Discount Rate	5.30	%	4.50	%	4.40	%	4.50	%	5.00	%	4.20	%
Rate of Compensation Increase	4.00	%	4.00	%	3.90	%	3.75	%	—	%	—	%
Net Periodic Benefit Cost
Discount Rate	4.50% / 5.00%*		5.40	%	4.50% / 4.60%**		4.90	%	4.20	%	5.20	%
Expected Return on Plan Assets	7.50	%	7.50	%	6.20% / 6.35%**		5.80	%	5.75	%	5.75	%
Rate of Compensation Increase	4.00	%	4.00	%	3.75	%	3.85	%	—	%	—	%

*In conjunction with the remeasurement due to the amendment of the plans, a discount rate of 4.50% was used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 5.00% was used for the period subsequent to the date of remeasurement through December 31, 2013.

**In conjunction with the remeasurement due to the amendment of the plan, a discount rate of 4.50% and expected return on plan assets of 6.20% were used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 4.60% and expected return on plan assets of 6.35% were used for the period subsequent to the date of remeasurement through December 31, 2013.

We set the discount rate assumption annually for each of our retirement-related benefit plans at the measurement date to reflect the yield on a portfolio of high quality fixed income corporate debt instruments matched against the projected cash flows for future benefits.

Our long-term rate of return on plan assets assumption is an estimate, based on statistical analysis, of the average annual assumed return that will be produced from the plan assets until current benefits are paid. The market-related value equals the fair value of assets, determined as of the measurement date.  Our expectations for the future investment returns of the asset categories were based on a combination of historical market performance and evaluations of investment forecasts obtained from external consultants and economists.

The methodology underlying the return assumption included the various elements of the expected return for each asset class such as long-term rates of return, volatility of returns, and the correlation of returns between various asset classes. The expected return for the total portfolio was calculated based on the plan's strategic asset allocation.  Investment risk is measured and monitored on an ongoing basis through annual liability measurements, periodic asset/liability studies, and quarterly investment portfolio reviews.  Risk tolerance is established through consideration of plan liabilities, plan funded status, and corporate financial condition.

The expected return assumption for the life insurance reserve for our OPEB plan at December 31, 2013 and 2012 was 5.75 percent, which was based on full investment in fixed income securities with an average book yield of 5.58 percent and 5.77 percent in 2013 and 2012, respectively.

Our rate of compensation increase assumption is generally based on periodic studies of compensation trends.

For measurement purposes at December 31, 2013 and 2012, the annual rate of increase in the per capita cost of covered postretirement health care benefits assumed for the next calendar year was 7.50 percent and 8.00 percent, respectively, for benefits payable to both retirees prior to Medicare eligibility as well as Medicare eligible retirees. The rate was assumed to change gradually to 5.00 percent by 2019 and remain at that level thereafter.

The medical and dental premium used to determine the per retiree employer subsidy are capped. If the cap is not reached by the year 2015, the caps are then set equal to the year 2015 premium. Certain of the current retirees and all future retirees are subject to the cap.

Net Periodic Benefit Cost

The following table provides the components of the net periodic benefit cost for the plans described above for the years ended December 31.

	Pension Benefits
	U.S. Plans									Non U.S. Plans									OPEB
	2013			2012			2011			2013			2012			2011			2013			2012			2011
	(in millions of dollars)
Service Cost	$	59.4		$	48.8		$	42.7		$	4.3		$	4.2		$	4.8		$	0.7		$	1.6		$	1.9
Interest Cost	86.3			84.4			77.6			8.6			8.5			8.8			8.0			9.6			10.0
Expected Return on Plan Assets	(105.5		)	(88.8		)	(87.6		)	(12.5		)	(11.1		)	(12.2		)	(0.6		)	(0.7		)	(0.7		)
Amortization of:
Net Actuarial Loss	31.7			45.9			31.9			1.2			0.5			—			—			—			—
Prior Service Credit	(0.1		)	(0.4		)	(0.5		)	—			—			—			(4.9		)	(2.6		)	(2.6		)
Curtailment	0.7			—			—			(3.7		)	—			—			—			—			—
Total	$	72.5		$	89.9		$	64.1		$	(2.1	)	$	2.1		$	1.4		$	3.2		$	7.9		$	8.6

A one percent increase or decrease in the assumed health care cost trend rate at December 31, 2013 would have increased (decreased) the service cost and interest cost by $0.2 million and $(0.1) million, respectively, and the postretirement benefit obligation by $2.4 million and $(1.7) million, respectively.

Our OPEB plan currently receives a subsidy from the federal government under the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (the Medicare Act). This act allows an employer to choose whether to coordinate prescription drug benefits under a retiree medical plan with the Medicare prescription drug benefit or to keep the company plan design as it is and receive a subsidy from the federal government. When the Medicare Act became effective in 2006, we initially elected to receive the subsidy from the federal government with plans to defer our coordination with the new prescription drug benefit until a later date. This anticipated change was reflected in the net periodic benefit cost. In 2009, we amended the plan design to stop the deferral of coordination of benefits and elected to continue receiving the existing subsidy from the federal government. This election resulted in a $4.4 million prior service credit that began amortization in 2010. We received subsidy payments of $1.2 million, $1.3 million, and $1.3 million in 2013, 2012, and 2011, respectively. Our expected benefit payments in future years have been reduced by the amount of subsidy payments we expect to receive.

The unrecognized net actuarial loss and prior service credit included in accumulated other comprehensive income and expected to be amortized and included in net periodic pension cost for our pension plans during 2014 is $5.6 million before tax and $3.7 million after tax. The prior service credit expected to be amortized and included as a reduction to net periodic cost for our OPEB plan during 2014 is $1.7 million before tax and $1.1 million after tax.

Benefit Payments

The following table provides expected benefit payments, which reflect expected future service, as appropriate.

	Pension Benefits
	U.S. Plans		Non U.S. Plans		OPEB
	(in millions of dollars)
Year					Gross		Subsidy Payments		Net
2014	$	45.1	$	5.4	$	16.4	$	1.8	$	14.6
2015	49.3		5.8		16.4		1.9		14.5
2016	54.6		6.1		16.2		2.1		14.1
2017	59.4		6.4		15.9		2.2		13.7
2018	64.7		6.7		15.6		2.4		13.2
2019-2023	421.9		38.9		70.3		14.2		56.1

Pension Plans' Funding Policy

The funding policy for our U.S. qualified defined benefit plan is to contribute annually an amount at least equal to the minimum annual contribution required under ERISA and other applicable laws, but generally not greater than the maximum amount that can be deducted for federal income tax purposes. We had no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013. We elected to make a voluntary contribution of $50.0 million to this plan during 2013 but do not expect to make any contributions during 2014. The funding policy for our U.S. non-qualified defined benefit pension plan is to contribute the amount of the benefit payments made during the year. Our expected return on plan assets and discount rate will not affect the cash contributions we are required to make to our U.S. pension and OPEB plans because we have met all minimum funding requirements required under ERISA.

We made required contributions to our U.K. plan of $4.0 million, or approximately £2.5 million, during December 31, 2013. Effective October 1, 2013, we increased contributions to the U.K. plan from 24.8 percent to 30.0 percent of pensionable earnings for plan participants. We expect to make contributions of approximately $2.3 million, or £1.4 million, during 2014. Subsequent to June 30, 2014, we may make voluntary contributions in the future as is deemed necessary. We contribute to our U.K. pension plan sufficient to meet the minimum funding requirements under U.K. legislation.

Our OPEB plan represents a non-vested, non-guaranteed obligation, and current regulations do not require specific funding levels for these benefits, which are comprised of retiree life, medical, and dental benefits. It is our practice to use general assets to pay medical and dental claims as they come due in lieu of utilizing plan assets for the medical and dental benefit portions of our OPEB plan.

Defined Contribution Plans

We offer a 401(k) plan to all eligible U.S. employees under which a portion of employee contributions is matched. Concurrent with the adoption of our U.S. pension plan amendments, we adopted an amendment to increase the benefits under our 401(k) plan, effective January 1, 2014, to match dollar-for dollar up to 5.0 percent of base salary. We previously matched dollar-for-dollar up to 3.0 percent of base salary and $0.50 on the dollar for each of the next 2.0 percent of base salary for employee contributions into the 401(k) plan. Also effective January 1, 2014, we will include any performance-based incentive compensation as part of the definition of earnings for purposes of contributions. We will also establish a new component of the 401(k) plan wherein we will make an additional non-elective contribution of 4.5 percent of earnings for all eligible employees, and a separate transition contribution will be made for eligible employees who meet certain age and years of service criteria. These changes are in compliance with ERISA guidelines, and the 401(k) plan will continue to qualify for a “safe harbor” from annual discrimination testing.

We also offer a defined contribution plan to all eligible U.K. employees under which a portion of employee contributions is matched. Concurrent with the adoption of our U.K. pension plan amendments, we adopted an amendment to increase the benefits under our U.K. defined contribution plan. Effective July 1, 2014, we will increase benefits under the defined contribution plan wherein we will match two pounds for every one pound on the first 1.0 percentof employee contributions into the plan and will match additional employee contributions pound-for-pound up to 5.0 percent of base salary. We previously matched pound-for-pound up to 5.0 percent of base salary for employee contributions into the defined contribution plan and made an additional non-elective contribution of 5.0 percent of base salary. Also effective July 1, 2014, we will increase the non-elective contribution to 6.0 percent of base salary for all eligible employees, and a separate transition contribution will be made for all eligible employees through March 31, 2016.

During the years ended December 31, 2013, 2012, and 2011, we contributed $18.8 million, $18.9 million, and $18.8 million, respectively, to our U.S. defined contribution plan, and $2.9 million, $2.9 million, and $2.6 million, or £1.9 million, £1.8 million, and £1.6 million, respectively, to our U.K. defined contribution plan.

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Reconciliation of Policy and Contract Benefits and Reserves for Future Policy and Contract Benefits (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Policy and Contract Benefits	$ 1,511.0	$ 1,484.6	$ 1,494.0
Reserves for Future Policy and Contract Benefits	43,099.1	44,694.4	43,051.9
Total	44,610.1	46,179.0	44,545.9
Life Reserves for Future Policy and Contract Benefits	7,740.5	7,571.1	7,454.2
Accident and Health Active Life Reserves	8,225.5	7,763.3	7,259.6
Unrealized Adjustment to Reserves for Future Policy and Contract Benefits	4,108.5	6,277.5	5,245.6
Liability for Claims and Claims Adjustment Expense	$ 24,535.6	$ 24,567.1	$ 24,586.5	$ 24,339.4

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Debt Schedule (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 2,612.0	$ 2,755.4
Debt, Long-term and Short-term, Combined Amount	2,688.5	3,211.2
Securities Pledged as Collateral
Debt Instrument [Line Items]
Short-term Debt	76.5	455.8
Tailwind Holdings LLC [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal	10.0	10.0
Fair Value Hedge Adjustment LT Debt [Domain]
Debt Instrument [Line Items]
Long-term Debt	(5.7)	15.4
Junior Subordinated Debt Securities Due 2038
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.405%
Long-term Debt	226.5	226.5
Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Long-term Debt	50.8	50.8
Notes Payable Due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Long-term Debt	200.0	200.0
Notes Payable Due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.85%
Long-term Debt	296.8	296.7
Notes Payable Due 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.125%
Long-term Debt	350.0	350.0
Notes Payable Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Long-term Debt	399.7	399.6
Notes 7 Point 25 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%
Long-term Debt	200.0	200.0
Notes at 6 Point 75 Percent due 2028 callable at or above par
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Long-term Debt	165.8	165.8
Notes Payable Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Long-term Debt	39.5	39.5
Notes Due 2042
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Long-term Debt	248.6	248.6
Senior Secured Notes variable due 2036 callable at or above par [Member]
Debt Instrument [Line Items]
Long-term Debt	0	62.5
Senior Secured Notes variable due 2037 callable at or above par [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 440.0	$ 500.0
Maximum | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.20%
Minimum | Medium-term Notes Due 2023 to 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue
Premium Income	$ 7,624.7	$ 7,716.1	$ 7,514.2
Net Investment Income	2,492.1	2,515.2	2,519.6
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(0.8)	0	(19.9)
Other Net Realized Investment Gain (Loss)	7.6	56.2	15.0
Net Realized Investment Gain (Loss)	6.8	56.2	(4.9)
Other Income	230.2	227.9	249.1
Total Revenue	10,353.8	10,515.4	10,278.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	6,595.7	6,722.2	7,209.5
Commissions	909.5	917.2	879.2
Interest and Debt Expense	149.4	145.4	143.3
Deferral of Acquisition Costs	(466.8)	(467.3)	(442.5)
Amortization of Deferred Acquisition Costs	418.9	378.7	365.7
Impairment of Deferred Acquisition Costs	0	0	196.0
Compensation Expense	790.4	786.8	808.0
Other Expenses	751.5	782.9	785.5
Total Benefits and Expenses	9,148.6	9,265.9	9,944.7
Income Before Income Tax	1,205.2	1,249.5	333.3
Income Tax (Benefit)
Current	296.6	206.6	230.5
Deferred	50.5	148.5	(181.4)
Total Income Tax	347.1	355.1	49.1
Net Income	$ 858.1	$ 894.4	$ 284.2
Net Income Per Common Share
Basic	$ 3.24	$ 3.18	$ 0.94
Assuming Dilution	$ 3.23	$ 3.17	$ 0.94

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Investments

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Investments

Fixed Maturity Securities

At December 31, 2013 and 2012, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	December 31, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,028.6	$	173.1	$	5.6	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		117.2		40.0		1,783.2
Foreign Governments	1,226.4		149.6		2.8		1,373.2
Public Utilities	9,328.9		1,126.9		52.8		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		184.6		4.0		2,039.3
All Other Corporate Bonds	23,108.0		2,602.6		198.7		25,511.9
Redeemable Preferred Stocks	33.0		4.7		—		37.7
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	303.9	$	42,344.4

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	December 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	41.1	$	3.1	$	5.2	$	2.5
States, Municipalities, and Political Subdivisions	412.5		33.5		37.2		6.5
Foreign Governments	87.2		2.8		—		—
Public Utilities	870.6		47.1		58.7		5.7
Mortgage/Asset-Backed Securities	341.0		3.6		2.5		0.4
All Other Corporate Bonds	3,412.3		174.0		207.4		24.7
Total Fixed Maturity Securities	$	5,164.7	$	264.1	$	311.0	$	39.8

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	December 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	903.9	$	20.6	$	915.5	$	—	$	9.0
Over 1 year through 5 years	7,098.2		727.1		7,678.5		0.6		146.2
Over 5 years through 10 years	9,492.6		940.2		8,137.4		95.8		2,199.6
Over 10 years	18,936.2		2,486.2		18,441.5		203.5		2,777.4
	36,430.9		4,174.1		35,172.9		299.9		5,132.2
Mortgage/Asset-Backed Securities	1,858.7		184.6		1,695.8		4.0		343.5
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	36,868.7	$	303.9	$	5,475.7

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

At December 31, 2013, the fair value of investment-grade fixed maturity securities was $39,145.1 million, with a gross unrealized gain of $4,205.0 million and a gross unrealized loss of $247.8 million. The gross unrealized loss on investment-grade fixed maturity securities was 81.5 percent of the total gross unrealized loss on fixed maturity securities. Unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities.

At December 31, 2013, the fair value of below-investment-grade fixed maturity securities was $3,199.3 million, with a gross unrealized gain of $153.7 million and a gross unrealized loss of $56.1 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 18.5 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At December 31, 2013, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded an other-than-temporary impairment will recover in value.

As of December 31, 2013, we held 245 individual investment-grade fixed maturity securities and 53 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 16 investment-grade fixed maturity securities and 8 below-investment-grade fixed maturity securities had been in an unrealized loss position continuously for over one year.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate the following factors:

• Whether we expect to recover the entire amortized cost basis of the security

• Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis

• Whether the security is current as to principal and interest payments

• The significance of the decline in value

• The time period during which there has been a significant decline in value

• Current and future business prospects and trends of earnings

• The valuation of the security's underlying collateral

• Relevant industry conditions and trends relative to their historical cycles

• Market conditions

• Rating agency and governmental actions

• Bid and offering prices and the level of trading activity

• Adverse changes in estimated cash flows for securitized investments

• Changes in fair value subsequent to the balance sheet date

• Any other key measures for the related security

While determining other-than-temporary impairments is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of problem investments and the recording of losses on a timely basis for investments determined to have an other-than-temporary impairment.

We held no fixed maturity securities during 2013 or 2012 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income. During 2011, we held and sold one fixed maturity security for which an $8.5 million other-than-temporary impairment had been recognized in other comprehensive income.

At December 31, 2013, we had non-binding commitments of $58.0 million to fund private placement fixed maturity securities. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments include tax credit partnerships, private equity partnerships, and special purpose entities. For those variable interests that are not consolidated in our financial statements, we are not the primary beneficiary because we have neither the power to direct the activities that are most significant to economic performance nor the responsibility to absorb a majority of the expected losses. The determination of whether we are the primary beneficiary is performed at the time of our initial investment and at the date of each subsequent reporting period.

As of December 31, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $470.8 million, comprised of $309.5 million of tax credit partnerships and $161.3 million of private equity partnerships. These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Additionally, we recognize a liability for all legally binding unfunded commitments to these partnerships, with a corresponding recognition of an invested asset.  Our liability for legally binding unfunded commitments to the tax credit partnerships was $27.2 million at December 31, 2013. Contractually, we are a limited partner in these investments, and our maximum exposure to loss is limited to the carrying value of our investment. We also had non-binding commitments of $158.4 million to fund certain private equity partnerships at December 31, 2013, the amount of which may or may not be funded.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection and a private equity partnership investment.  We contributed the bond and several partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the remaining partnership while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  The fair values of the bond and partnership were $136.2 million and $4.4 million, respectively, as of December 31, 2013.  The bond is reported as a component of fixed maturity securities, and the partnership is reported as a component of other long-term investments in our consolidated balance sheets. At December 31, 2013, we had no commitments to fund the underlying partnership, nor did we fund any amounts to the partnerships during the years ended December 31, 2013, 2012, and 2011.

Mortgage Loans

Our mortgage loan portfolio is well diversified by both geographic region and property type to reduce risk of concentration. All of our mortgage loans are collateralized by commercial real estate. When issuing a new loan, our general policy is not to exceed a loan-to-value ratio, or the ratio of the loan balance to the estimated fair value of the underlying collateral, of 75 percent. We update the loan-to-value ratios at least every three years for each loan, and properties undergo a general inspection at least every two years. Our general policy for newly issued loans is to have a debt service coverage ratio greater than 1.25 times on a normalized 25 year amortization period. We update our debt service coverage ratios annually.

Mortgage loans by property type and geographic region are presented below. Prior year amounts by property type have been reclassified to conform to the current year presentation.

	December 31
	2013				2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	61.1	3.3	%	$	47.2	2.7	%
Industrial	567.8		31.3		545.7		31.9
Office	776.5		42.8		721.2		42.1
Retail	409.7		22.6		398.6		23.3
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

Region
New England	$	100.9	5.6	%	$	114.3	6.7	%
Mid-Atlantic	191.5		10.5		160.0		9.3
East North Central	244.3		13.5		224.7		13.1
West North Central	162.3		8.9		160.8		9.4
South Atlantic	447.7		24.7		440.9		25.7
East South Central	67.7		3.7		79.6		4.7
West South Central	190.9		10.5		159.5		9.3
Mountain	101.9		5.6		90.5		5.3
Pacific	307.9		17.0		282.4		16.5
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

We evaluate each of our mortgage loans individually for impairment and assign an internal credit quality rating based on a comprehensive rating system used to evaluate the credit risk of the loan. The factors we use to derive our internal credit ratings may include the following:

• Loan-to-value ratio

• Debt service coverage ratio based on current operating income

• Property location, including regional economics, trends and demographics

• Age, condition, and construction quality of property

• Current and historical occupancy of property

• Lease terms relative to market

• Tenant size and financial strength

• Borrower's financial strength

• Borrower's equity in transaction

• Additional collateral, if any

Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining whether we will initially issue the loan and also in assigning values and determining impairment. We assign an overall rating to each loan using an internal rating scale of Aa (highest quality) to B (lowest quality). We review and adjust, as needed, our internal credit quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Internal Rating
Aa	$	10.8	$	11.5
A	683.1		659.4
Baa	1,094.6		994.5
Ba	13.5		34.2
B	13.1		13.1
Total	$	1,815.1	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	777.4	$	624.7
> 65% <= 75%	867.5		858.8
> 75% <= 85%	107.6		142.5
> 85%	62.6		86.7
Total	$	1,815.1	$	1,712.7

There have been no changes to our accounting policies or methodology from the prior period regarding estimating the allowance for credit losses on our mortgage loans. The activity in the allowance for credit losses is as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5		$	1.5
Provision	—		1.8			—
Charge-offs, Net of Recoveries	—		(1.8		)	—
Balance at End of Year	$	1.5	$	1.5		$	1.5

Impaired mortgage loans are as follows:

	December 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	13.1	$	14.6	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

Our average investment in impaired mortgage loans was $14.9 million, $19.1 million, and $21.3 million for the years ended December 31, 2013, 2012, and 2011, respectively. For each of the years ended December 31, 2013, 2012, and 2011, we recognized $0.8 million of interest income on impaired mortgage loans.

A summary of our troubled debt restructurings is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.3	$	17.3	$	19.9
Number of Loans	1		3		2
Payoff/Sale
Carrying Amount	$	—	$	—	$	3.2
Realized Loss	$	—	$	—	$	0.2
Number of Loans	—		—		1

We had no realized losses on loan foreclosures for the years ended December 31, 2013, 2012, and 2011 other than the initial impairment losses recognized prior to foreclosure.

At December 31, 2013, we held no mortgage loans that were greater than 90 days past due regarding principal and/or interest payments. At December 31, 2012, we held one mortgage loan that was greater than 90 days past due and for which we had discontinued the accrual of investment income. The mortgage loan had a carrying value of $4.3 million and was foreclosed during 2013.

At December 31, 2013, we had non-binding commitments of $83.9 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

Transfers of Financial Assets

To manage our cash position more efficiently, we may enter into repurchase agreements with unaffiliated financial institutions. We generally use repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. Our repurchase agreements are typically outstanding for less than 30 days. We post collateral through our repurchase agreement transactions whereby the counterparty commits to purchase securities with the agreement to resell them to us at a later, specified date. The fair value of collateral posted is generally 102 percent of the cash received.

Our investment policy also permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements. These agreements increase our investment income with minimal risk. Our securities lending policy requires that a minimum of 102 percent of the fair value of the securities loaned be maintained as collateral. Generally, cash is received as collateral under these agreements and is typically reinvested in short-term investments. In the event that securities are received as collateral, we are not permitted to sell or re-post them.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of December 31, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $201.6 million, for which we received collateral in the form of cash and securities of $76.5 million and $132.9 million, respectively. As of December 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $452.8 million, for which we received collateral in the form of cash and securities of $455.8 million and $14.5 million, respectively. We had no outstanding repurchase agreements at December 31, 2013 or 2012.

Offsetting of Financial Instruments

We enter into master netting agreements with each of our derivatives counterparties. These agreements provide for conditional rights of set-off upon the occurrence of an early termination event. An early termination event is considered a default, and it allows the non-defaulting party to offset its contracts in a loss position against any gain positions or payments due to the defaulting party. Under our agreements, default type events are defined as failure to pay or deliver as contractually agreed, misrepresentation, bankruptcy, or merger without assumption. See Note 4 for further discussion of collateral related to our derivative contracts.

We have securities lending agreements with unaffiliated financial institutions that post collateral to us in return for the use of our fixed maturity securities. A right of set-off exists that allows us to keep and apply collateral received in the event of default by the counterparty. Default within a securities lending agreement would typically occur if the counterparty failed to return the securities borrowed from us as contractually agreed. In addition, if we default by not returning collateral received, the counterparty has a right of set-off against our securities or any other amounts due to us.

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	December 31, 2013
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	10.8	$	—	$	10.8	$	(9.5	)	$	(1.1	)	$	0.2
Securities Lending	201.6		—		201.6		(125.1		)	(76.5		)	—
Total	$	212.4	$	—	$	212.4	$	(134.6	)	$	(77.6	)	$	0.2
Financial Liabilities:
Derivatives	$	135.6	$	—	$	135.6	$	(98.6	)	$	—		$	37.0
Securities Lending	76.5		—		76.5		(76.5		)	—			—
Total	$	212.1	$	—	$	212.1	$	(175.1	)	$	—		$	37.0

	December 31, 2012
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
Financial Liabilities:
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Fixed Maturity Securities	$	2,371.6	$	2,404.0	$	2,425.2
Derivative Financial Instruments	35.2		28.9		22.9
Mortgage Loans	109.2		107.1		100.1
Policy Loans	15.7		14.8		14.1
Other Long-term Investments	18.0		15.2		13.1
Short-term Investments	2.4		4.3		2.9
Gross Investment Income	2,552.1		2,574.3		2,578.3
Less Investment Expenses	29.5		26.9		26.9
Less Investment Income on Participation Fund Account Assets	15.7		16.1		17.4
Less Amortization of Tax Credit Partnerships	14.8		16.1		14.4
Net Investment Income	$	2,492.1	$	2,515.2	$	2,519.6

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	15.8		$	29.3		$	74.0
Gross Losses on Sales	(45.7		)	(20.4		)	(24.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—			(19.9		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	15.6			5.0			7.1
Gross Losses on Sales	—			(4.3		)	(0.5		)
Impairment Loss	(2.0		)	(1.9		)	(0.6		)
Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8			(39.4		)
Credit Default Swaps	(1.9		)	—			—
Foreign Currency Transactions	(4.9		)	(3.3		)	(1.6		)
Net Realized Investment Gain (Loss)	$	6.8		$	56.2		$	(4.9	)

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Fair Values of Financial Instruments

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Fair Values of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the following chart.

	December 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,344.4	$	42,344.4	$	44,973.0	$	44,973.0
Mortgage Loans	1,815.1		1,980.2		1,712.7		1,937.1
Policy Loans	3,276.0		3,339.6		3,133.8		3,215.3
Other Long-term Investments
Derivatives	10.8		10.8		81.6		81.6
Equity Securities	16.4		16.4		14.6		14.6
Miscellaneous Long-term Investments	475.2		475.2		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	631.5	$	631.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	563.1		563.1		535.5		535.5
Long-term Debt	2,612.0		2,824.4		2,755.4		2,968.8
Other Liabilities
Derivatives	135.6		135.6		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	53.2		53.2		83.9		83.9
Unfunded Commitments to Investment Partnerships	27.2		27.2		83.7		83.7

The methods and assumptions used to estimate fair values of financial instruments are discussed as follows.

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

Mortgage Loans: Fair values are estimated using discounted cash flow analyses and interest rates currently being offered for similar loans to borrowers with similar credit ratings and maturities. Loans with similar characteristics are aggregated for purposes of the calculations. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Policy Loans: Fair values for policy loans, net of reinsurance ceded, are estimated using discounted cash flow analyses and interest rates currently being offered to policyholders with similar policies. Carrying amounts for ceded policy loans, which equal $3,043.7 million and $2,912.7 million as of December 31, 2013 and 2012, respectively, approximate fair value and are reported on a gross basis in our consolidated balance sheets. A change in interest rates for ceded policy loans will not impact our financial position because the benefits and risks are fully ceded to reinsuring counterparties. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Fair values for private equity partnerships are primarily derived from net asset values provided by the general partner in the partnerships' financial statements. Our private equity partnerships represent funds that are primarily invested in power, energy, railcar leasing, infrastructure development, and mezzanine debt. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. As of December 31, 2013, we estimate that the underlying assets of the funds will be liquidated over the next one to ten years. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Policyholders' Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies and represent customer deposits plus interest credited at contract rates. Carrying amounts approximate fair value. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Fair values for insurance contracts other than investment contracts are not required to be disclosed. However, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which seeks to minimize exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

Long-term Debt: Fair values for long-term debt are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements. Debt instruments which are valued using active trades from independent pricing services for which there was current market activity in that specific debt instrument have fair values of $1,329.2 million and $1,212.0 million as of December 31, 2013 and 2012, respectively, and are assigned a Level 1 within the fair value hierarchy. Debt instruments which are valued based on prices from pricing services that generally use observable inputs for securities or comparable securities in active markets in their valuation techniques have fair values of $1,495.2 million and $1,756.8 million as of December 31, 2013 and 2012, respectively, and are assigned a Level 2.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent legally binding amounts that we have committed to certain investment partnerships subject to the partnerships meeting specified conditions. When these conditions are met, we are obligated to invest these amounts in the partnerships. Carrying amounts approximate fair value. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, derivative financial instruments, and equity securities at fair value in our consolidated balance sheets. The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. An active market for a financial instrument is a market in which transactions for an asset or a similar asset occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value and should be used to measure fair value whenever available. Conversely, financial instruments rarely traded or not quoted have less observability and are measured at fair value using valuation techniques that require more judgment. Pricing observability is generally impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, the characteristics specific to the transaction, and overall market conditions.

Valuation techniques used for assets and liabilities accounted for at fair value are generally categorized into three types. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets or liabilities. The income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. The cost approach is based upon the amount that currently would be required to replace the service capacity of an asset, or the current replacement cost.

We use valuation techniques that are appropriate in the circumstances and for which sufficient data are available that can be obtained without undue cost and effort. In some cases, a single valuation technique will be appropriate (for example, when valuing an asset or liability using quoted prices in an active market for identical assets or liabilities). In other cases, multiple valuation techniques will be appropriate. If we use multiple valuation techniques to measure fair value, we evaluate and weigh the results, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The selection of the valuation method(s) to apply considers the definition of an exit price and depends on the nature of the asset or liability being valued. For assets and liabilities accounted for at fair value, we generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. We believe the market approach valuation technique provides more observable data than the income approach, considering the type of investments we hold. Our fair value measurements could differ significantly based on the valuation technique and available inputs. When using a pricing service, we obtain the vendor's pricing documentation to ensure we understand their methodologies. We periodically review and approve the selection of our pricing vendors to ensure we are in agreement with their current methodologies. When markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. Our internal investment management professionals, which include portfolio managers and analysts, monitor securities priced by brokers and evaluate their prices for reasonableness based on benchmarking to available primary and secondary market information. In weighing a broker quote as an input to fair value, we place less reliance on quotes that do not reflect the result of market transactions. We also consider the nature of the quote, particularly whether the quote is a binding offer. If prices in an inactive market do not reflect current prices for the same or similar assets, adjustments may be necessary to arrive at fair value. When relevant market data is unavailable, which may be the case during periods of market uncertainty, the income approach can, in suitable circumstances, provide a more appropriate fair value. During 2013, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2012.

We use observable and unobservable inputs in measuring the fair value of our financial instruments. Inputs that may be used include the following:

• Broker market maker prices and price levels

• Trade Reporting and Compliance Engine (TRACE) pricing

• Prices obtained from external pricing services

• Benchmark yields (Treasury and interest rate swap curves)

• Transactional data for new issuance and secondary trades

• Security cash flows and structures

• Recent issuance/supply

• Sector and issuer level spreads

• Security credit ratings/maturity/capital structure/optionality

• Corporate actions

• Underlying collateral

• Prepayment speeds/loan performance/delinquencies/weighted average life/seasoning

• Public covenants

• Comparative bond analysis

• Derivative spreads

• Relevant reports issued by analysts and rating agencies 

• Audited financial statements

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices obtained to ensure they are consistent with a variety of observable market inputs and to verify the validity of a security's price.  In the event we receive a vendor's market price that does not appear reasonable based on our market analysis, we may challenge the price and request further information about the assumptions and methodologies used by the vendor to price the security. We may change the vendor price based on a better data source such as an actual trade. We also review all price changes from the prior month which fall outside a predetermined corridor. The overall valuation process for determining fair values may include adjustments to valuations obtained from our pricing sources when they do not represent a valid exit price. These adjustments may be made when, in our judgment and considering our knowledge of the financial conditions and industry in which the issuer operates, certain features of the financial instrument require that an adjustment be made to the value originally obtained from our pricing sources. These features may include the complexity of the financial instrument, the market in which the financial instrument is traded, counterparty credit risk, credit structure, concentration, or liquidity. Additionally, an adjustment to the price derived from a model typically reflects our judgment of the inputs that other participants in the market for the financial instrument being measured at fair value would consider in pricing that same financial instrument. In the event an asset is sold, we test the validity of the fair value determined by our valuation techniques by comparing the selling price to the fair value determined for the asset in the immediately preceding month end reporting period closest to the transaction date.

The parameters and inputs used to validate a price on a security may be adjusted for assumptions about risk and current market conditions on a quarter to quarter basis, as certain features may be more significant drivers of valuation at the time of pricing. Changes to inputs in valuations are not changes to valuation methodologies; rather, the inputs are modified to reflect direct or indirect impacts on asset classes from changes in market conditions.

Fair values for derivatives other than embedded derivatives in modified coinsurance arrangements are based on market quotes or pricing models and represent the net amount of cash we would have paid or received if the contracts had been settled or closed as of the last day of the period. We analyze credit default swap spreads relative to the average credit spread embedded within the LIBOR-setting syndicate in determining the effect of credit risk on our derivatives' fair values.  If net counterparty credit risk for a derivative asset is determined to be material and is not adequately reflected in the LIBOR-based fair value obtained from our pricing sources, we adjust the valuations obtained from our pricing sources. For purposes of valuing net counterparty risk, we measure the fair value of a group of financial assets and financial liabilities on the basis of the price that would be received to sell a net long position or transfer a net short position for a particular risk exposure in an orderly transaction between market participants at the measurement date under current market conditions. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

Fair values for our embedded derivative in a modified coinsurance arrangement are estimated using internal pricing models and represent the hypothetical value of the duration mismatch of assets and liabilities, interest rate risk, and third party credit risk embedded in the modified coinsurance arrangement.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations combining matrix pricing with vendor purchased software programs, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

At December 31, 2013, approximately 6.0 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

The remaining 94.0 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 76.0 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2.  Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

• Approximately 4.1 percent of our fixed maturity securities were valued based on one or more non-binding broker price levels, if validated by observable market data, or on TRACE prices for identical or similar assets absent current market activity. When only one price is available, it is used if observable inputs and analysis confirms that it is appropriate. These assets, for which we were able to validate the price using other observable market data, were classified as Level 2.

• Approximately 13.9 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.  Level 3 is the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

We consider transactions in inactive or disorderly markets to be less representative of fair value. We use all available observable inputs when measuring fair value, but when significant other unobservable inputs and adjustments are necessary, we classify these assets or liabilities as Level 3.

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	December 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	144.5	$	1,051.6	$	—	$	1,196.1
States, Municipalities, and Political Subdivisions	—		1,608.1		175.1		1,783.2
Foreign Governments	—		1,294.7		78.5		1,373.2
Public Utilities	396.8		9,802.7		203.5		10,403.0
Mortgage/Asset-Backed Securities	—		2,038.8		0.5		2,039.3
All Other Corporate Bonds	1,982.0		21,670.8		1,859.1		25,511.9
Redeemable Preferred Stocks	—		13.9		23.8		37.7
Total Fixed Maturity Securities	2,523.3		37,480.6		2,340.5		42,344.4
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		9.2		—		9.2
Foreign Exchange Contracts	—		1.6		—		1.6
Total Derivatives	—		10.8		—		10.8
Equity Securities	—		11.8		4.6		16.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	35.0	$	—	$	35.0
Foreign Exchange Contracts	—		98.7		—		98.7
Credit Default Swaps	—		1.9		—		1.9
Embedded Derivative in Modified Coinsurance Arrangement	—		—		53.2		53.2
Total Derivatives	—		135.6		53.2		188.8

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

Transfers of assets between Level 1 and Level 2 are as follows:

	Year Ended December 31
	2013				2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	62.2	$	—	$	—	$	224.7
States, Municipalities, and Political Subdivisions	—		53.0		—		43.8
Public Utilities	345.9		53.4		47.1		653.1
All Other Corporate Bonds	1,199.0		1,085.3		1,068.6		2,808.9
Total Fixed Maturity Securities	$	1,607.1	$	1,191.7	$	1,115.7	$	3,730.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Year Ended December 31, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(13.1	)	$	—	$	(1.0	)	$	60.5	$	—		$	175.1
Foreign Governments	82.1			—			(3.6		)	—		—			—		—			78.5
Public Utilities	574.4			—			(10.8		)	—		(3.1		)	151.8		(508.8		)	203.5
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(147.1		)	186.7		(122.0		)	1,462.0		(699.4		)	1,859.1
Redeemable Preferred Stocks	24.8			—			(1.0		)	—		—			—		—			23.8
Total Fixed Maturity Securities	1,988.3			1.1			(175.5		)	186.7		(126.2		)	1,674.3		(1,208.2		)	2,340.5
Equity Securities	4.3			—			0.3			—		—			—		—			4.6
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	30.7			—			—		—			—		—			(53.2		)
	Year Ended December 31, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Year
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.3	)	$	18.4	$	(0.7	)	$	43.2	$	—		$	128.7
Foreign Governments	—			—			5.0			15.4		—			61.7		—			82.1
Public Utilities	338.9			—			22.3			47.9		(4.2		)	481.4		(311.9		)	574.4
Mortgage/Asset-Backed Securities	31.7			—			—			—		(0.1		)	—		(31.1		)	0.5
All Other Corporate Bonds	665.5			1.2			40.8			151.6		(67.5		)	599.8		(213.6		)	1,177.8
Redeemable Preferred Stocks	37.2			(1.0		)	2.9			—		(14.3		)	—		—			24.8
Total Fixed Maturity Securities	1,141.4			0.2			70.7			233.3		(86.8		)	1,186.1		(556.6		)	1,988.3
Equity Securities	11.2			(0.1		)	—			—		(0.1		)	—		(6.7		)	4.3
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	51.8			—			—		—			—		—			(83.9		)

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation. Gains for the years ended December 31, 2013 and 2012 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at each year end were $30.7 million and $51.8 million, respectively. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	December 31, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	142.7		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.65%
Public Utilities	64.3			- Volatility of Credit	(e)	0.75% - 1.25% / 0.92%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	4.93% - 5.03% / 5.01%
All Other Corporate Bonds - Private	307.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	3.36% - 3.36% / 3.36% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.07% - 4.00% / 0.84% Priced at Par
All Other Corporate Bonds - Public	514.4			- Change in Benchmark Reference - Comparability Adjustment - Lack of Marketability - Volatility of Credit	(a) (b) (d) (e)	(0.32)% - 0.25% / 0.04% (0.23)% - 1.00% / 0.41% 0.20% - 0.20% / 0.20% (0.88)% - 0.46% / (0.26)%
Equity Securities - Private	4.2			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(53.2		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

(e) Represents basis point adjustments for credit-specific factors

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

Isolated increases in unobservable inputs other than market convention will result in a lower fair value measurement, whereas isolated decreases will result in a higher fair value measurement. The unobservable input for market convention is not sensitive to input movements. The projected liability cash flows used in the fair value measurement of our Level 3 embedded derivative are based on expected claim payments. If claim payments increase, the projected liability cash flows will increase, resulting in a decrease in the fair value of the embedded derivative. Decreases in projected liability cash flows will result in an increase in the fair value of the embedded derivative.

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Commitments and Contingent Liabilities

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Commitments and Contingent Liabilities

Commitments

We have noncancelable lease obligations on certain office space and equipment. As of December 31, 2013, the aggregate net minimum lease payments were $213.9 million payable as follows: $40.7 million in 2014, $27.9 million in 2015, $22.4 million in 2016, $17.7 million in 2017, $16.6 million in 2018, and $88.6 million thereafter. Rental expense for the years ended December 31, 2013, 2012, and 2011 was $44.1 million, $41.6 million, and $36.1 million, respectively.

At December 31, 2013, we had unfunded commitments of $158.4 million for certain of our private equity partnerships, $58.0 million for certain private placement fixed maturity securities, and $83.9 million for certain mortgage loans.  The commitments are not legally binding at December 31, 2013 and may or may not be funded during the term of the investments.

Contingent Liabilities

We are a defendant in a number of litigation matters. In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

Unless indicated otherwise in the descriptions below, reserves have not been established for litigation and contingencies. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Claims Handling Matters

We and our insurance subsidiaries, in the ordinary course of our business, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Most typically these lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our consolidated financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages could, from time to time, have a material adverse effect on our consolidated results of operations in a period, depending on the results of operations for the particular period.

From time to time class action allegations are pursued where the claimant or policyholder purports to represent a larger number of individuals who are similarly situated. Since each insurance claim is evaluated based on its own merits, there is rarely a single act or series of actions which can properly be addressed by a class action. Nevertheless, we monitor these cases closely and defend ourselves appropriately where these allegations are made.

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  In July 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. This decision was affirmed by the United States District Court for the Southern District of New York in September 2012 and upheld by the United States Court of Appeals for the Second Circuit in June 2013. In October 2013, the plaintiff filed a petition for writ of certiorari with the U.S. Supreme Court. On February 24, 2014, the Supreme Court denied the plaintiff’s petition.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This class action alleges that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were part of the ERISA employee welfare benefit plans and under which we paid death benefits via retained asset accounts. The plaintiffs' principal theories in the case are: (1) funds held in retained asset accounts were plan assets, and the proceeds earned by us from investing those funds belonged to the beneficiaries, and (2) payment of claims using retained asset accounts did not constitute payment under Maine's late payment statute, requiring us to pay interest on the undrawn retained asset account funds at an annual rate of 18 percent. In February 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts. A bench trial was held on the issue of damages in June and July of 2013. In September 2013, the District Court awarded damages based on a benchmark it created by averaging the interest rates paid on money market mutual funds and money market checking accounts. Based on these averages, the District Court found that for certain periods of the class we should have paid additional interest and awarded damages of $12.1 million and prejudgment interest of $1.3 million. Subsequent to this judgment, in September 2013 we filed an appeal to the First Circuit Court of Appeals, and plaintiffs filed a cross appeal. Based on contrary law that has developed recently in similar cases, we believe that we have strong legal arguments to raise on appeal. We have not accrued a loss for the judgment because we have determined that we do not have a probable loss under the applicable accounting standard relating to the accrual of loss contingencies. We cannot predict the timing of a decision or assure the ultimate outcome of our appeal.

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. In addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years. During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established additional reserves of $95.5 million for payment of these benefits. Similar to other insurers, we are undergoing an examination by a third party acting on behalf of a number of state treasurers concerning our compliance with the unclaimed property laws of the participating states. We are cooperating fully with this examination, as well as with a Delaware Market Conduct examination and a Voluntary Disclosure Agreement process with the state of Minnesota. The legal and regulatory environment around unclaimed death benefits continues to evolve. It is possible that the current examination and/or similar investigations by other state jurisdictions may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties, the total of which may be in excess of the reserves established. See Note 6 for further information concerning the reserve for unclaimed death benefits.

In December 2012, State of West Virginia ex rel. John D. Perdue v. Provident Life and Accident Insurance Company and State of West Virginia ex rel. John D. Perdue v. Colonial Life & Accident Insurance Company were filed in the Circuit Court of Putnam County, West Virginia. These two separate complaints alleged violations of the West Virginia Uniform Unclaimed Property Act by failing to identify and report all unclaimed insurance policy proceeds due to be escheated to West Virginia.  The complaints sought to examine company records and assess penalties and costs in an undetermined amount. In December 2013, the court dismissed both complaints, holding that the West Virginia Uniform Unclaimed Property Act does not require insurance companies to periodically search the Social Security Administrations' Death Master File or escheat unclaimed life insurance benefits until a claim has been submitted. In January 2014, the plaintiff appealed the dismissal of both complaints.

In May 2013, a purported class action complaint entitled Ruben Don v. Unum Life Insurance Company of America, Wedner Insurance Group, Inc. dba The Morton Wedner Insurance Agency, and Does 1-30, was filed in the Superior Court of California, County of Los Angeles.  The plaintiff seeks to represent a class of California insureds who were issued long-term care policies containing an inflation protection feature.  The plaintiff alleges we incorrectly administer the inflation protection feature, resulting in an underpayment of benefits.  The complaint makes allegations against us for breach of contract, bad faith, fraud, violation of Business and Professions Code 17200, and injunctive relief. In June 2013, we removed the case to the United States District Court for the Central District of California.  We are in the process of preparing our response to this complaint.

Summary

Various lawsuits against us, in addition to those discussed above, have arisen in the normal course of business. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations.

Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period. We believe, however, that the ultimate outcome of all pending litigation and regulatory matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on our financial position.

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Stockholders' Equity and Earnings Per Common Share

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

Stockholders Equity and Earnings Per Common Share

Stockholders' Equity and Earnings Per Common Share

Earnings Per Common Share

Net income per common share is determined as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	858.1	$	894.4	$	284.2
Denominator (000s)
Weighted Average Common Shares - Basic	264,725.8		281,355.9		302,399.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,223.4		400.9		1,171.2
Weighted Average Common Shares - Assuming Dilution	265,949.2		281,756.8		303,571.0
Net Income Per Common Share
Basic	$	3.24	$	3.18	$	0.94
Assuming Dilution	$	3.23	$	3.17	$	0.94

We use the treasury stock method to account for the effect of outstanding stock options, nonvested restricted stock units, and nonvested performance share units on the computation of diluted earnings per share. Under this method, these potential common shares will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the exercise price of the stock options and the grant price of the nonvested restricted stock units and the nonvested performance share units. The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested restricted stock units have grant prices ranging from $19.38 to $32.35, and the nonvested performance share units have a grant price of $23.97. See Note 11.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of diluted earnings per share because their impact would be antidilutive, based on then current market prices, approximated 0.1 million, 2.5 million, and 2.1 million shares of common stock for the years ended December 31, 2013, 2012, and 2011, respectively.

Common Stock

Our board of directors has authorized the repurchase of Unum Group's common stock under the following repurchase programs:

	Share Repurchase Program Authorized During
	December 2013		July 2012		February 2011		May 2010
	(in millions of dollars)
Authorized Repurchase Amount	$	750.0	$	750.0	$	1,000.0	$	500.0
Remaining Repurchase Amount at Year End 2013	$	730.0	$	—	$	—	$	—

The December 2013 share repurchase program has an expiration date of June 12, 2015.

Common stock repurchases were classified as follows in our consolidated statements of stockholders' equity:

	Year Ended December 31
	2013			2012			2011
	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
Treasury Stock	11.2	$	318.6	23.6	$	500.6	17.7	$	419.9
Retirement of Common Shares	—	—		—	—		7.7	200.0
Total	11.2	$	318.6	23.6	$	500.6	25.4	$	619.9

The cost in the preceding chart includes commissions of $0.2 million, $0.6 million, and $0.3 million for the years ended December 31, 2013, 2012, and 2011, respectively.

In February 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock at our option. The final price adjustment settlement occurred in March 2011, resulting in the delivery to us of 0.6 million additional shares. We retired 7.7 million shares during 2011. All other repurchased shares have been classified as treasury stock.

Preferred Stock

Unum Group has 25,000,000 shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

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Income Tax (Benefit)(Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax [Abstract]
Net Income	$ 347.1	$ 355.1	$ 49.1
Additional Paid in Capital [Abstract]
Stock-Based Compensation	(0.8)	3.5	(3.3)
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(1,102.8)	467.7	798.3
Change in Adjustment to Reserves for Future Policy and Contract Benefits Net of Reinsurance and Other tax expense benefit	(743.3)	325.6	701.5
Change in Net Gain on Cash Flow Hedges	(1.3)	(4.3)	25.2
Change in Unrecognized Pension and Postretirement Benefit Costs	185.2	(68.0)	(67.4)
Total	$ 170.7	$ 428.4	$ 100.4

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Liability for Unpaid Claims

12 Months Ended

Dec. 31, 2013

Insurance [Abstract]

Liability for Unpaid Claims Disclosure [Text Block]

Changes in the liability for unpaid claims and claim adjustment expenses are as follows:

	2013			2012			2011
	(in millions of dollars)
Balance at January 1	$	24,567.1		$	24,586.5		$	24,339.4
Less Reinsurance Recoverable	2,006.0			2,042.6			2,028.2
Net Balance at January 1	22,561.1			22,543.9			22,311.2
Incurred Related to
Current Year	4,751.9			4,946.2			4,684.4
Prior Years
Interest	1,230.0			1,247.6			1,262.9
All Other Incurred	(44.7		)	(175.7		)	209.1
Foreign Currency	41.2			101.1			(10.9		)
Total Incurred	5,978.4			6,119.2			6,145.5
Paid Related to
Current Year	(1,657.3		)	(1,715.4		)	(1,588.6		)
Prior Years	(4,419.4		)	(4,386.6		)	(4,324.2		)
Total Paid	(6,076.7		)	(6,102.0		)	(5,912.8		)
Net Balance at December 31	22,462.8			22,561.1			22,543.9
Plus Reinsurance Recoverable	2,072.8			2,006.0			2,042.6
Balance at December 31	$	24,535.6		$	24,567.1		$	24,586.5

The majority of the net balances are related to disability claims with long-tail payouts on which interest earned on assets backing liabilities is an integral part of pricing and reserving. Interest accrued on prior year reserves has been calculated on the opening reserve balance less one-half year's cash payments at our average reserve discount rate used during 2013, 2012, and 2011.

"Incurred Related to Prior Years - All Other Incurred" for the years shown in the preceding chart includes the reserve adjustments as discussed in the following paragraphs, which create variances year over year. Excluding those adjustments, the variability exhibited year over year is caused primarily by the level of claim resolutions in the period relative to the long-term expectations reflected in the reserves. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period, both favorably and unfavorably. Claim resolution rates for 2013 in the Unum US group long-term disability product line were less favorable than the level of 2012, though still above the level of our long-term assumptions.

2013 Unclaimed Death Benefits Reserve Increase

Beginning in 2011, a number of state regulators began requiring insurers to cross-check specified insurance policies with the Social Security Administration’s Death Master File to identify potential matches. If a potential match was identified, insurers were requested to determine if benefits were due, locate beneficiaries, and make payments where appropriate. We initiated this process where requested, and in 2012 we began implementing this process in all states on a forward-looking basis. In addition to implementing this on a forward-looking basis, in 2013 we began an initiative to search for potential claims from previous years.

During the fourth quarter of 2013, we completed our assessment of benefits which we estimate will be paid under this initiative, and as such, established $95.5 million of additional claim reserves for payment of these benefits. Claim reserves were increased $49.1 million for Unum US group life, $26.3 million for Unum US voluntary life, and $20.1 million for Colonial Life voluntary life. The reserves established were attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

2013 Group Life Waiver of Premium Benefit Reserve Reduction

Within our Unum US segment, we offer group life insurance coverage which consists primarily of renewable term life insurance and includes a provision for waiver of premium, if disabled. The group life waiver of premium benefit (group life waiver) provides for continuation of life insurance coverage when an insured, or the employer on behalf of the insured, is no longer paying premium because the employee is not actively at work due to a disability. The group life waiver claim reserve is the present value of future anticipated death benefits reflecting the probability of death while remaining disabled. Claim reserves are calculated using assumptions based on past experience adjusted for current trends and any other factors that would modify past experience and are subject to revision as current claim experience emerges and alters our view of future expectations. The two fundamental assumptions in the development of the group life waiver reserve are mortality and recovery. Our emerging experience and that which continues to emerge within the industry indicate an increase in life expectancies, which decreases the ultimate anticipated death benefits to be paid under the group life waiver benefit. Emerging experience also reflects an improvement in claim recovery rates, which also lessens the likelihood of payment of a death benefit while the insured is disabled. During the fourth quarter of 2013, we completed a review of our assumptions and modified our mortality and claim recovery assumptions for our Unum US group life waiver reserves and, as a result, reduced claim reserves by $85.0 million. Of this amount, approximately $78.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

2011 Long-term Care Loss Recognition

We generally perform loss recognition tests on our deferred acquisition costs and policy reserves in the fourth quarter of each year, but more frequently if appropriate, using best estimate assumptions as of the date of the test without a provision for adverse deviation. Included in our analysis for the long-term care product line during the fourth quarter of 2011 was a review of our reserve discount rate, mortality, and morbidity assumptions. Our analysis of reserve discount rate assumptions considered the significant decline in long-term interest rates which occurred late in 2011. We also considered an updated industry study for long-term care experience which was made available mid-year 2011 from the Society of Actuaries. Our analysis of this study, which was completed during the fourth quarter of 2011, showed that lower termination rates than we had previously assumed were beginning to emerge in industry and in our own company experience. Based on our analysis, as of December 31, 2011 we lowered the discount rate assumption to reflect the low interest rate environment and our expectation of future investment portfolio yield rates. We also changed our mortality assumptions to reflect emerging experience due to an increase in life expectancies which increases the ultimate number of people who will utilize long-term care benefits and also lengthens the amount of time a claimant receives long-term care benefits.  We changed our morbidity assumptions to reflect emerging industry experience as well as our own company experience. While our morbidity experience is still emerging and is not fully credible, we modified our assumptions to align more closely with the recently published industry study. Using our revised best estimate assumptions, as of December 31, 2011 we determined that deferred acquisition costs of $196.0 million were not recoverable and that our policy and claim reserves should be increased by $573.6 million to reflect our then current estimate of future benefit obligations. Of this amount, $248.1 million was related to claim reserves, and approximately $215.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.

2011 Claim Reserve Increase for Individual Disability Closed Block Business

In December 2011, we analyzed our reserve assumptions for individual disability closed block claim reserves. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and environmental changes and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business. At that time, we were able, with a higher degree of confidence, to assess our own experience for older ages in our long duration lifetime claim block as our data had become credible. There is very little industry experience for lifetime disability benefits, as our insurance companies were the primary disability companies in the insurance industry at the time lifetime disability benefits were offered. These benefits were offered during the 1980s and 1990s, recent enough such that claimants are just reaching the older ages and providing us with data to build our claim experience base. Emerging experience indicated a longer life expectancy for our older age, longer duration disabled claimants, which lengthens the time a claimant receives disability benefits. As a result of this experience, as of December 31, 2011 we adjusted our mortality assumption within our claim resolution rate assumption and, as a result, increased our claim reserves for our individual disability closed block of business by $183.5 million. Of this amount, approximately $176.0 million was attributed to prior year incurred claims, thereby impacting the results shown in the preceding chart.  

Reconciliation

A reconciliation of policy and contract benefits and reserves for future policy and contract benefits as reported in our consolidated balance sheets to the liability for unpaid claims and claim adjustment expenses is as follows:

	December 31
	2013		2012		2011
	(in millions of dollars)
Policy and Contract Benefits	$	1,511.0	$	1,484.6	$	1,494.0
Reserves for Future Policy and Contract Benefits	43,099.1		44,694.4		43,051.9
Total	44,610.1		46,179.0		44,545.9
Less:
Life Reserves for Future Policy and Contract Benefits	7,740.5		7,571.1		7,454.2
Accident and Health Active Life Reserves	8,225.5		7,763.3		7,259.6
Unrealized Adjustment to Reserves for Future Policy and Contract Benefits	4,108.5		6,277.5		5,245.6
Liability for Unpaid Claims and Claim Adjustment Expenses	$	24,535.6	$	24,567.1	$	24,586.5

The unrealized adjustment to reserves for future policy and contract benefits reflects the changes that would be necessary to policyholder liabilities if the unrealized investment gains and losses related to the available-for-sale securities had been realized. Changes in this adjustment are reported as a component of other comprehensive income or loss.

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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 5,164.7	$ 586.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	264.1	11.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	311.0	596.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	39.8	44.2
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	41.1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	3.1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5.2	6.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2.5	1.1
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	412.5	30.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	33.5	0.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	37.2	42.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	6.5	6.9
Foreign Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	87.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	870.6	110.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	47.1	3.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	58.7	147.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	5.7	11.2
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	341.0	4.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	3.6	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2.5	3.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.4	0.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,412.3	441.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	174.0	7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	207.4	396.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 24.7	$ 24.5

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Stock-Based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 23.6	$ 24.2	$ 23.5
Allocated Share-based Compensation Expense, Net of Tax	15.6	15.6	15.3
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1.1	0	0
Restricted Stock Units and Cash-Settled Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	21.0	20.9	19.6
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1.0	2.7	2.7
Other Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 0.5	$ 0.6	$ 1.2

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Derivative Financial Instruments

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, and credit risk.Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps and U.S. Treasury rates, current and forward currency swaps, forward treasury locks, currency forward contracts, forward contracts on specific fixed income securities, and credit default swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes. We do not use derivative financial instruments for speculative purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk are as follows:

• Interest rate swaps are used to hedge interest rate risks and to improve the matching of assets and liabilities. An interest rate swap is an agreement in which we agree with other parties to exchange, at specified intervals, the difference between fixed rate and variable rate interest amounts. We use interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• Forward treasury locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities. A forward treasury lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific U.S. Treasury bond at a future date at a pre-determined price.

• Options on U.S. Treasury rates are used to hedge the interest rate risk associated with the anticipated purchase of fixed maturity securities. These options give us the right, but not the obligation, to receive a specific interest rate for a specified period of time. These options enable us to lock in a minimum investment yield to hedge the potential adverse impact of declining interest rates.

Derivatives designated as fair value hedges and used to reduce our exposure to interest rate and duration risk are as follows:

• Interest rate swaps are used to effectively convert certain of our fixed rate securities into floating rate securities which are used to fund our floating rate long-term debt. Under these swap agreements, we receive a variable rate of interest and pay a fixed rate of interest. Additionally, we use interest rate swaps to effectively convert certain fixed rate, long-term debt into floating rate long-term debt. Under these swap agreements, we receive a fixed rate of interest and pay a variable rate of interest.

Derivatives designated as cash flow hedges and used to reduce our exposure to foreign currency risk are as follows:

• Foreign currency interest rate swaps have historically been used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification and to hedge the currency risk associated with certain of the principal and interest payments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries . For hedges of fixed maturity securities, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment. For hedges of debt issued, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments to the counterparty in exchange for fixed rate U.S. dollar-denominated principal and interest payments.

• Foreign currency forward contracts are used to minimize foreign currency risks. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We have used these forward contracts to hedge the foreign currency risk associated with certain of the principal repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Derivatives not designated as hedging instruments and used to reduce our exposure to credit losses on securities owned are as follows:

• Credit default swaps are used as economic hedges against credit risk but do not qualify for hedge accounting. A credit default swap is an agreement in which we agree with another party to pay, at specified intervals, a fixed-rate fee in exchange for insurance against a credit event on a specific investment. If a defined credit event occurs, our counterparty may either pay us a net cash settlement or we may surrender the specific investment to them in exchange for cash equal to the full notional amount of the swap. Credit events typically include events such as bankruptcy, failure to pay, or certain types of debt restructuring.

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held, was $5.5 million at December 31, 2013. We held $1.1 million cash collateral from our counterparties at December 31, 2013. We held no cash collateral at December 31, 2012. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $95.6 million and $108.6 million at December 31, 2013 and 2012, respectively. We had no cash posted as collateral to our counterparties at December 31, 2013. We had $1.8 million cash posted as collateral to our counterparties at December 31, 2012. See Note 3 for further discussion of our master netting agreements.

The majority of our derivative instruments contain provisions that require us to maintain specified issuer credit ratings and financial strength ratings. Should our ratings fall below these specified levels, we would be in violation of the provisions, and our derivatives counterparties could terminate our contracts and request immediate payment. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position was $135.6 million and $170.5 million at December 31, 2013 and 2012, respectively.

Derivative Transactions

The table below summarizes, by notional amounts, the activity for each category of derivatives. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	—	$	—	$	1,681.9
Additions	—		—		—		—		46.9		—		46.9
Terminations	—		63.9		205.0		—		46.9		—		315.8
Balance at December 31, 2011	174.0		554.0		685.0		—		—		—		1,413.0
Additions	—		—		250.0		—		86.0		—		336.0
Terminations	—		45.2		185.0		—		86.0		—		316.2
Balance at December 31, 2012	174.0		508.8		750.0		—		—		—		1,432.8
Additions	—		160.0		—		97.0		24.0		10.0		291.0
Terminations	24.0		38.4		150.0		—		24.0		10.0		246.4
Balance at December 31, 2013	$	150.0	$	630.4	$	600.0	$	97.0	$	—	$	—	$	1,477.4

Cash Flow Hedges

As of December 31, 2013 and 2012, we had $630.4 million and $508.8 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities and long-term debt. During 2013, we entered into $150.0 million notional amount of receive fixed, pay fixed foreign currency swaps to hedge the currency risk on a portion of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries. As of December 31, 2012, we had $150.0 million notional amount of receive fixed, pay variable forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities. These interest rate swaps were terminated as scheduled in 2013.

For the years ended December 31, 2013, 2012, and 2011 there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness.

As of December 31, 2013, we expect to amortize approximately $46.7 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of December 31, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $150.0 million and $174.0 million, respectively, notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. The change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a gain (loss) of $(11.5) million, $(1.2) million and $8.1 million for the years ended December 31, 2013, 2012, and 2011, respectively, with an offsetting gain or loss on the related interest rate swaps.

As of December 31, 2013 and 2012, we had $600.0 million notional amount of receive fixed, pay variable interest rate swaps to hedge the changes in the fair value of certain fixed rate long-term debt. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provide for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. The change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a gain (loss) of $21.1 million, $(6.6) million, and $(23.2) million for the years ended December 31, 2013, 2012, and 2011, respectively, with an offsetting gain or loss on the related interest rate swaps.

For the years ended December 31, 2013, 2012, and 2011, there was no material ineffectiveness related to our fair value hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives not Designated as Hedging Instruments

As of December 31, 2013, we held $97.0 million notional amount of single name credit default swaps. We entered into these swaps in order to mitigate the credit risk associated with specific securities owned. We had no open credit default swaps as of December 31, 2012.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our realized investment gains and losses a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract. There are no credit-related counterparty triggers, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down.

Locations and Amounts of Derivative Financial Instruments

The following tables summarize the location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	December 31, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	9.2	Other Liabilities	$	35.0
Foreign Exchange Contracts	Other L-T Investments	1.6		Other Liabilities	98.7
Total		$	10.8		$	133.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.9
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	53.2
Total					$	55.1

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

The following table summarizes the location of gains and losses on the effective portion of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of income and consolidated statements of comprehensive income.

		Year Ended December 31
		2013			2012			2011
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	(7.2	)	$	77.9		$	50.3
Options		(0.1		)	—			—
Foreign Exchange Contracts		22.6			3.5			22.4
	Total	$	15.3		$	81.4		$	72.7
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	43.1		$	40.0		$	34.8
	Foreign Exchange Contracts	(5.9		)	(5.3		)	(1.1		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	1.3			4.1			3.5
	Foreign Exchange Contracts	(13.8		)	(17.0		)	10.1
Interest and Debt Expense
	Interest Rate Swaps	(1.7		)	(1.7		)	(1.6		)
	Total	$	23.0		$	20.1		$	45.7

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

		Year Ended December 31
		2013			2012		2011
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.9	)	$	—	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8		(39.4		)
	Total	$	28.8		$	51.8	$	(39.4	)

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2013

Accumulated Other Comprehensive Income [Abstract]

Comprehensive Income (Loss) Note

Components of our accumulated other comprehensive income, after tax, and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(746.4		)	9.7			25.5			328.6			(382.6		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	8.6			(15.0		)	—			16.0			9.6
	Net Other Comprehensive Income (Loss)	(737.8		)	(5.3		)	25.5			344.6			(373.0		)
Balance at December 31, 2013		$	135.7		$	396.3		$	(47.1	)	$	(229.9	)	$	255.0

The net unrealized gain on securities consists of the following components:

	December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	4,054.8		$	7,221.5		$	(3,166.7	)
Other Investments	55.5			92.8			(37.3		)
Deferred Acquisition Costs	(41.6		)	(67.0		)	25.4
Reserves for Future Policy and Contract Benefits	(4,108.5		)	(6,277.5		)	2,169.0
Reinsurance Recoverable	263.8			351.5			(87.7		)
Deferred Income Tax	(88.3		)	(447.8		)	359.5
Total	$	135.7		$	873.5		$	(737.8	)

Amounts reclassified from accumulated other comprehensive income were recognized in our consolidated statements of income as follows:

			Year Ended
			December 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(12.6	)
		Other-Than-Temporary Impairment Loss	(0.8		)
			(13.4		)
	Income Tax Benefit		(4.8		)
	Total		$	(8.6	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	43.1
		Loss on Foreign Exchange Contracts	(5.9		)
	Net Realized Investment Gain (Loss)
		Gain on Interest Rate Swaps	1.3
		Loss on Foreign Exchange Contracts	(13.8		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(1.7		)
			23.0
	Income Tax Expense		8.0
	Total		$	15.0
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(32.9	)
		Amortization of Prior Service Credit	5.0
		Curtailment Gain	3.0
			(24.9		)
	Income Tax Benefit		(8.9		)
	Total		$	(16.0	)

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Income Tax

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

Total income tax expense (benefit) is allocated as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Net Income	$	347.1		$	355.1		$	49.1
Stockholders' Equity - Additional Paid-in Capital
Stock-Based Compensation	(0.8		)	3.5			(3.3		)
Stockholders' Equity - Accumulated Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment	(1,102.8		)	467.7			798.3
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	743.3			(325.6		)	(701.5		)
Change in Net Gain on Cash Flow Hedges	(1.3		)	(4.3		)	25.2
Change in Unrecognized Pension and Postretirement Benefit Costs	185.2			(68.0		)	(67.4		)
Total	$	170.7		$	428.4		$	100.4

A reconciliation of the income tax expense (benefit) attributable to income from operations before income tax, computed at U.S. federal statutory tax rates, to the income tax expense (benefit) as included in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
Statutory Income Tax	35.0	%	35.0	%	35.0	%
Prior Year Taxes	(0.1	)	(0.9	)	(11.0	)
Foreign Items	(1.9	)	(2.0	)	(0.3	)
Tax Credits	(3.4	)	(2.7	)	(5.9	)
Other Items, Net	(0.8	)	(1.0	)	(3.1	)
Effective Tax	28.8	%	28.4	%	14.7	%

Our net deferred tax liability consists of the following. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31
	2013		2012
	(in millions of dollars)
Deferred Tax Liability
Deferred Acquisition Costs	$	70.0	$	39.3
Fixed Assets	80.3		74.1
Invested Assets	1,274.3		2,342.8
Other	54.4		63.2
Gross Deferred Tax Liability	1,479.0		2,519.4
Deferred Tax Asset
Reserves	1,180.1		1,934.2
Employee Benefits	151.2		315.2
Other	3.4		0.6
Gross Deferred Tax Asset	1,334.7		2,250.0
Total Net Deferred Tax Liability	$	144.3	$	269.4

Our consolidated statements of income include amounts subject to both domestic and foreign taxation. The income and related tax expense (benefit) are as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Income Before Tax
United States - Federal	$	1,072.0	$	1,128.4		$	160.5
Foreign	133.2		121.1			172.8
Total	$	1,205.2	$	1,249.5		$	333.3
Current Tax Expense
United States - Federal	$	277.9	$	164.4		$	218.4
Foreign	18.7		42.2			12.1
Total	296.6		206.6			230.5
Deferred Tax Expense (Benefit)
United States - Federal	47.3		173.5			(203.4		)
Foreign	3.2		(25.0		)	22.0
Total	50.5		148.5			(181.4		)
Total	$	347.1	$	355.1		$	49.1

The U.K. government enacted income tax rate reductions during each of the years 2010 through 2013. During 2013, the rate was reduced from 23 percent to 21 percent effective April 2014, and to 20 percent effective April 2015. Although the rate reductions in each instance became or will become effective during a subsequent year, we are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change.  As a result, we recorded income tax benefits of $6.3 million for the three percent tax rate reduction enacted during 2013 and $9.3 million and $6.8 million for the two percent tax rate reductions enacted during 2012 and 2011, respectively.

We consider the unremitted earnings of our foreign operations to be permanently invested and therefore have not provided U.S. deferred taxes on the cumulative earnings of our non-U.S. affiliates. Deferred taxes are provided for earnings of non-U.S. affiliates when we plan to remit those earnings. As of December 31, 2013, we have not made a provision for U.S. taxes on approximately $1 billion of the excess of the carrying amount for financial reporting over the tax basis of investments in foreign subsidiaries that are essentially permanent in duration. The determination of a deferred tax liability related to investments in these foreign subsidiaries is not practicable.

Our consolidated statements of income include the following changes in unrecognized tax benefits:

	December 31
	2013			2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	17.5		$	86.9		$	138.9
Tax Positions Taken During Prior Years
Additions	5.7			13.3			4.4
Subtractions	—			(0.6		)	(11.8		)
Settlements with Tax Authorities	(4.8		)	(23.5		)	(44.6		)
Lapses of Statute of Limitations	—			(61.1		)	—
Tax Positions Taken During Current Year	—			2.5			—
Balance at End of Year	18.4			17.5			86.9
Less Tax Attributable to Temporary Items Included Above	(10.2		)	(15.0		)	(86.9		)
Total Unrecognized Tax Benefits that if Recognized Would Affect the Effective Tax Rate	$	8.2		$	2.5		$	—

Included in the balances at December 31, 2013, 2012, and 2011 are $10.2 million, $15.0 million, and $86.9 million, respectively, of unrecognized tax benefits for tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. Other than potential interest and penalties, the disallowance of the shorter deductibility period would not affect our results of operations but would accelerate the payment of cash to the taxing authority.

We recognize interest expense and penalties, if applicable, related to unrecognized tax benefits in tax expense net of federal income tax. We recognized a reduction of interest expense associated with unrecognized tax benefits of $1.1 million, $10.4 million, and $13.1 million for 2013, 2012, and 2011, respectively.  The total amounts of accrued interest and penalties related to unrecognized tax benefits in our consolidated balance sheets as of December 31, 2013 and 2012 were $0.8 million and $1.9 million, respectively. It is reasonably possible that unrecognized tax benefits could decrease within the next 12 months by $0 to $8.0 million pending resolution of items with the Internal Revenue Service (IRS).

We file federal and state income tax returns in the United States and in foreign jurisdictions. We are under continuous examination by the IRS with regard to our U.S. federal income tax returns. During 2013, our appeal of tax years 2005 and 2006 was effectively settled with the approval of the Congressional Joint Committee on Taxation. As a result of the settlement, we recognized in our 2013 operating results a reduction in federal income taxes of $1.4 million as well as other income of $4.0 million before tax and $2.6 million after tax. We expect to receive a cash refund of taxes and interest under this settlement of approximately $17.5 million in 2014.

During 2012, the IRS audit of our 2009 and 2010 years commenced, and we also finalized all issues with the IRS related to our 2007 and 2008 years resulting in a reduction of our federal income taxes of $11.0 million. During 2011, the IRS approved our final settlement for tax years 1996 to 2004.  The settlement resulted from our administrative appeal of audit adjustments relating primarily to insurance tax reserves and losses incurred by foreign subsidiaries.  As a result of the settlement, we recognized in our 2011 operating results a reduction in our federal income taxes of $41.3 million as well as interest income of $17.5 million before tax and $11.4 million after tax.  We received a cash refund of taxes and interest under this settlement of $60.4 million in 2012.

Tax years subsequent to 2008 remain subject to examination by tax authorities in the U.S., and tax years subsequent to 2010 remain subject to examination in major foreign jurisdictions. We believe sufficient provision has been made for all potential adjustments for years that are not closed by the statute of limitations in all major tax jurisdictions and that any such adjustments would not have a material adverse effect on our financial position, liquidity, or results of operations.

In January 2013, the American Taxpayer Relief Act retroactively reinstated the active financing income exemption to the beginning of 2012 which affects the amount of earnings from foreign subsidiaries that is taxed annually, regardless of whether foreign earnings are repatriated. Our 2012 income tax expense reflected the taxation of all active financing income from our foreign subsidiaries as required under the law in place prior to the reinstatement. In 2013, we reversed the amounts recorded in 2012 and recorded a reduction in income tax expense of $0.9 million to reflect the reinstatement of the exemption of active financing income. The active financing income exemption expired again for tax years beginning on or after January 1, 2014, the effect of which is expected to be immaterial in 2014.

As of December 31, 2013 and 2012, we had no net operating loss carryforward for U.S. income taxes. We record a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized.  As of December 31, 2013 and 2012, we had no valuation allowance. In 2011, as part of an IRS settlement, we released a $4.1 million valuation allowance related to basis differences in foreign subsidiaries and net operating loss carryforwards in foreign jurisdictions.

Total income taxes paid net of refunds during 2013, 2012, and 2011 were $398.1 million, $185.0 million, and $303.5 million, respectively.

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,815.1	[1]	$ 1,712.7
B Credit Rating [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	13.1		13.1
Ba Credit Rating [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	13.5		34.2
Baa Credit Rating [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	1,094.6		994.5
A Credit Rating [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	683.1		659.4
AA Credit Rating [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 10.8		$ 11.5

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Segment Information Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Integer	Dec. 31, 2012
Supplementary Insurance Information, by Segment [Line Items]
Number of Operating Segments	3
Goodwill	$ 200.9	$ 201.7
Unum U.S.
Supplementary Insurance Information, by Segment [Line Items]
Goodwill	$ 189.0

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Reconciliation of income tax computed at US Federal tax rates (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax [Abstract]
Statutory Income Tax	35.00%	35.00%	35.00%
Prior Year Taxes	(0.10%)	(0.90%)	(11.00%)
Foreign Items	(1.90%)	(2.00%)	(0.30%)
Tax Credits	(3.40%)	(2.70%)	(5.90%)
Other Items, Net	(0.80%)	(1.00%)	(3.10%)
Effective Tax	28.80%	28.40%	14.70%

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Activity in Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year	$ 1.5	$ 1.5	$ 1.5
Provisions	0	1.8	0
Charge-offs, Net of Recoveries	0	(1.8)	0
Balance at End of Period	$ 1.5	$ 1.5	$ 1.5

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Employee Benefit Plans Expected Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit Payments in Year One	$ 45.1
Benefit Payments in Year Two	49.3
Benefit Payments in Year Three	54.6
Benefit Payments in Year Four	59.4
Benefit Payments in Year Five	64.7
Benefit Payments in Five Fiscal Years Thereafter	421.9
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit Payments in Year One	5.4
Benefit Payments in Year Two	5.8
Benefit Payments in Year Three	6.1
Benefit Payments in Year Four	6.4
Benefit Payments in Year Five	6.7
Benefit Payments in Five Fiscal Years Thereafter	38.9
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit Payments in Year One	16.4
Prescription Drug Subsidy Receipts, Year One	1.8
Net OPEB Payments in Year One	14.6
Benefit Payments in Year Two	16.4
Prescription Drug Subsidy Receipts, Year Two	1.9
Net OPEB Payments in Year Two	14.5
Benefit Payments in Year Three	16.2
Prescription Drug Subsidy Receipts, Year Three	2.1
Net OPEB Payments in Year Three	14.1
Benefit Payments in Year Four	15.9
Prescription Drug Subsidy Receipts, Year Four	2.2
Net OPEB Payments in Year Four	13.7
Benefit Payments in Year Five	15.6
Prescription Drug Subsidy Receipts, Year Five	2.4
Net OPEB Payments in Year Five	13.2
Benefit Payments in Five Fiscal Years Thereafter	70.3
Prescription Drug Subsidy Receipts, Five Fiscal Years Thereafter	14.2
Net OPEB Payments in Five Fiscal Years Thereafter	$ 56.1

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Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,815.1	[1]	$ 1,712.7
Percent of Total	100.00%		100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	100.9		114.3
Percent of Total	5.60%		6.70%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	191.5		160.0
Percent of Total	10.50%		9.30%
East North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	244.3		224.7
Percent of Total	13.50%		13.10%
West North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	162.3		160.8
Percent of Total	8.90%		9.40%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	447.7		440.9
Percent of Total	24.70%		25.70%
East South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	67.7		79.6
Percent of Total	3.70%		4.70%
West South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	190.9		159.5
Percent of Total	10.50%		9.30%
Mountain
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	101.9		90.5
Percent of Total	5.60%		5.30%
Pacific
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 307.9		$ 282.4
Percent of Total	17.00%		16.50%

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Employee Benefit Plans Change in Projected Benefit Obligation Amount (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 1,718.7	$ 1,967.9	$ 1,579.8
Service Cost	59.4	48.8	42.7
Interest Cost	86.3	84.4	77.6
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	(225.9)	291.4
Defined Benefit Plan, Benefits Paid	(42.2)	(36.5)
DefinedBenefitPlanAmendments-BenefitObligationImpact	0	0
Defined Benefit Plan, Curtailments	(126.8)	0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	0	0
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	1,718.7	1,822.3
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	1,590.7	1,353.6	1,170.8
Defined Benefit Plan, Actual Return on Plan Assets	224.6	161.8
Defined Benefit Plan, Contributions by Employer	54.7	57.5
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Defined Benefit Plan, Funded Status of Plan	128.0	614.3
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	208.7	197.4	170.4
Service Cost	4.3	4.2	4.8
Interest Cost	8.6	8.5	8.8
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	2.6	9.4
Defined Benefit Plan, Benefits Paid	(4.1)	(3.9)
DefinedBenefitPlanAmendments-BenefitObligationImpact	0	0
Defined Benefit Plan, Curtailments	(3.7)	0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	3.6	8.8
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	197.7	187.3
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	225.7	205.6	188.0
Defined Benefit Plan, Actual Return on Plan Assets	15.6	8.6
Defined Benefit Plan, Contributions by Employer	4.0	4.1
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	4.6	8.8
Defined Benefit Plan, Funded Status of Plan	(17.0)	(8.2)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	165.3	198.8	190.9
Service Cost	0.7	1.6	1.9
Interest Cost	8.0	9.6	10.0
Defined Benefit Plan, Contributions by Plan Participants	3.9	3.5
Defined Benefit Plan, Actuarial Gain (Loss)	(30.2)	19.1
Defined Benefit Plan, Benefits Paid	(15.9)	(16.7)
DefinedBenefitPlanAmendments-BenefitObligationImpact	0	(5.0)
Defined Benefit Plan, Curtailments	0	(4.2)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	0	0
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	11.4	11.5	11.7
Defined Benefit Plan, Actual Return on Plan Assets	0.2	0.3
Defined Benefit Plan, Contributions by Employer	11.7	12.7
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Defined Benefit Plan, Funded Status of Plan	$ 153.9	$ 187.3

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Parent Company Balance Sheet (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fixed Maturity Securities, Amortized Cost	$ 38,289.6	$ 37,751.5
Parent Company
Fixed Maturity Securities, Amortized Cost	$ 143.9	$ 217.7

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Investments (Tables)

12 Months Ended

Dec. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At December 31, 2013 and 2012, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	December 31, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,028.6	$	173.1	$	5.6	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		117.2		40.0		1,783.2
Foreign Governments	1,226.4		149.6		2.8		1,373.2
Public Utilities	9,328.9		1,126.9		52.8		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		184.6		4.0		2,039.3
All Other Corporate Bonds	23,108.0		2,602.6		198.7		25,511.9
Redeemable Preferred Stocks	33.0		4.7		—		37.7
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	303.9	$	42,344.4

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	December 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	41.1	$	3.1	$	5.2	$	2.5
States, Municipalities, and Political Subdivisions	412.5		33.5		37.2		6.5
Foreign Governments	87.2		2.8		—		—
Public Utilities	870.6		47.1		58.7		5.7
Mortgage/Asset-Backed Securities	341.0		3.6		2.5		0.4
All Other Corporate Bonds	3,412.3		174.0		207.4		24.7
Total Fixed Maturity Securities	$	5,164.7	$	264.1	$	311.0	$	39.8

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

Distribution of the Maturity Dates for Fixed Maturity Securities

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	December 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	903.9	$	20.6	$	915.5	$	—	$	9.0
Over 1 year through 5 years	7,098.2		727.1		7,678.5		0.6		146.2
Over 5 years through 10 years	9,492.6		940.2		8,137.4		95.8		2,199.6
Over 10 years	18,936.2		2,486.2		18,441.5		203.5		2,777.4
	36,430.9		4,174.1		35,172.9		299.9		5,132.2
Mortgage/Asset-Backed Securities	1,858.7		184.6		1,695.8		4.0		343.5
Total Fixed Maturity Securities	$	38,289.6	$	4,358.7	$	36,868.7	$	303.9	$	5,475.7

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

Mortgage Loans by Property Type

Mortgage loans by property type and geographic region are presented below. Prior year amounts by property type have been reclassified to conform to the current year presentation.

	December 31
	2013				2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	61.1	3.3	%	$	47.2	2.7	%
Industrial	567.8		31.3		545.7		31.9
Office	776.5		42.8		721.2		42.1
Retail	409.7		22.6		398.6		23.3
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	100.9	5.6	%	$	114.3	6.7	%
Mid-Atlantic	191.5		10.5		160.0		9.3
East North Central	244.3		13.5		224.7		13.1
West North Central	162.3		8.9		160.8		9.4
South Atlantic	447.7		24.7		440.9		25.7
East South Central	67.7		3.7		79.6		4.7
West South Central	190.9		10.5		159.5		9.3
Mountain	101.9		5.6		90.5		5.3
Pacific	307.9		17.0		282.4		16.5
Total	$	1,815.1	100.0	%	$	1,712.7	100.0	%

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal Rating

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	December 31
	2013		2012
	(in millions of dollars)
Internal Rating
Aa	$	10.8	$	11.5
A	683.1		659.4
Baa	1,094.6		994.5
Ba	13.5		34.2
B	13.1		13.1
Total	$	1,815.1	$	1,712.7

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio

Loan-to-Value Ratio
<= 65%	$	777.4	$	624.7
> 65% <= 75%	867.5		858.8
> 75% <= 85%	107.6		142.5
> 85%	62.6		86.7
Total	$	1,815.1	$	1,712.7

Activity in the Allowance for Credit Losses

The activity in the allowance for credit losses is as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5		$	1.5
Provision	—		1.8			—
Charge-offs, Net of Recoveries	—		(1.8		)	—
Balance at End of Year	$	1.5	$	1.5		$	1.5

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	December 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	13.1	$	14.6	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

Troubled Debt Restructurings on Financing Receivables [Table Text Block]

A summary of our troubled debt restructurings is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.3	$	17.3	$	19.9
Number of Loans	1		3		2
Payoff/Sale
Carrying Amount	$	—	$	—	$	3.2
Realized Loss	$	—	$	—	$	0.2
Number of Loans	—		—		1

We had no realized losses on loan foreclosures for the years ended December 31, 2013, 2012, and 2011 other than the initial impairment losses recognized prior to foreclosure

Schedule of Financial Instrument and Derivative Offsetting [Table Text Block]

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	December 31, 2013
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	10.8	$	—	$	10.8	$	(9.5	)	$	(1.1	)	$	0.2
Securities Lending	201.6		—		201.6		(125.1		)	(76.5		)	—
Total	$	212.4	$	—	$	212.4	$	(134.6	)	$	(77.6	)	$	0.2
Financial Liabilities:
Derivatives	$	135.6	$	—	$	135.6	$	(98.6	)	$	—		$	37.0
Securities Lending	76.5		—		76.5		(76.5		)	—			—
Total	$	212.1	$	—	$	212.1	$	(175.1	)	$	—		$	37.0

	December 31, 2012
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial			Cash			Net
	Instruments		Balance Sheet		Balance Sheet		Instruments			Collateral			Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
Financial Liabilities:
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

Investment Income [Table Text Block]

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Fixed Maturity Securities	$	2,371.6	$	2,404.0	$	2,425.2
Derivative Financial Instruments	35.2		28.9		22.9
Mortgage Loans	109.2		107.1		100.1
Policy Loans	15.7		14.8		14.1
Other Long-term Investments	18.0		15.2		13.1
Short-term Investments	2.4		4.3		2.9
Gross Investment Income	2,552.1		2,574.3		2,578.3
Less Investment Expenses	29.5		26.9		26.9
Less Investment Income on Participation Fund Account Assets	15.7		16.1		17.4
Less Amortization of Tax Credit Partnerships	14.8		16.1		14.4
Net Investment Income	$	2,492.1	$	2,515.2	$	2,519.6

Realized Investment Gains and Losses Reported in Consolidated Statements of Income

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	15.8		$	29.3		$	74.0
Gross Losses on Sales	(45.7		)	(20.4		)	(24.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—			(19.9		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	15.6			5.0			7.1
Gross Losses on Sales	—			(4.3		)	(0.5		)
Impairment Loss	(2.0		)	(1.9		)	(0.6		)
Embedded Derivative in Modified Coinsurance Arrangement	30.7			51.8			(39.4		)
Credit Default Swaps	(1.9		)	—			—
Foreign Currency Transactions	(4.9		)	(3.3		)	(1.6		)
Net Realized Investment Gain (Loss)	$	6.8		$	56.2		$	(4.9	)

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Schedule V Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2013

Schedule V - Valuation and Qualifying Accts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Additions Charged to Other Accounts		Deductions (1)		Balance at End of Period
	(in millions of dollars)
Year Ended December 31, 2013
Real estate reserve (deducted from other long-term investments)	$	0.3	$	1.5	$	—	$	—	$	1.8
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	6.2	$	0.7	$	—	$	1.3	$	5.6
Year Ended December 31, 2012
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	5.7	$	0.9	$	—	$	0.4	$	6.2
Year Ended December 31, 2011
Real estate reserve (deducted from other long-term investments)	$	0.3	$	—	$	—	$	—	$	0.3
Allowance for doubtful accounts (deducted from accounts and premiums receivable)	$	7.2	$	1.3	$	—	$	2.8	$	5.7

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Reinsurance

12 Months Ended

Dec. 31, 2013

Reinsurance Disclosures [Abstract]

Reinsurance [Text Block]

Our reinsurance recoverable at December 31, 2013 relates to 86 companies. Thirteen major companies account for approximately 91 percent of our reinsurance recoverable at December 31, 2013, and are all companies rated A or better by A.M. Best Company (AM Best) or are fully securitized by letters of credit or investment-grade fixed maturity securities held in trust. Approximately eight percent of our reinsurance recoverable relates to business reinsured either with companies rated A- or better by AM Best, with overseas entities with equivalent ratings or backed by letters of credit or trust agreements, or through reinsurance arrangements wherein we retain the assets in our general account. The remaining one percent of our reinsurance recoverable is held by companies either rated below A- by AM Best or not rated.

Reinsurance data is as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Direct Premium Income	$	7,777.3		$	7,736.0		$	7,521.5
Reinsurance Assumed	203.2			210.9			216.6
Reinsurance Ceded	(355.8		)	(230.8		)	(223.9		)
Net Premium Income	$	7,624.7		$	7,716.1		$	7,514.2
Ceded Benefits and Change in Reserves for Future Benefits	$	728.7		$	591.7		$	609.2

We entered into reinsurance agreements, effective January 1, 2013, whereby the agreements provide 50 percent coverage up to £0.5 million per covered life and 100 percent coverage, per covered life, above that amount for the existing in-force block of Unum UK group life business as well as new policies issued during the term of the agreements. 

We entered into a reinsurance agreement effective April 1, 2013 to cede the inforce policies on a small block of individual disability business in our Unum US segment.

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Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue									$ 10,347.0	$ 10,459.2	$ 10,282.9
Realized Investment Gains (Losses)									6.8	56.2	(4.9)
Revenues	2,586.2	2,540.9	2,601.9	2,624.8	2,658.2	2,628.0	2,617.9	2,611.3	10,353.8	10,515.4	10,278.0
Operating Income (Loss)									1,241.8	1,239.7	1,323.2
Realized Investment Gains (Losses)									6.8	56.2	(4.9)
Non-operating Retirement-related Loss									(32.9)	(46.4)	(31.9)
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes									(95.5)
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax									85.0
Impairment of Deferred Acquisition Costs									0	0	(196.0)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	305.8	284.1	311.5	303.8	322.7	320.4	296.4	310.0	1,205.2	1,249.5	333.3
Unum U.S.
Segment Reporting, Revenue Reconciling Item [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes									(75.4)	0	0
Colonial Life
Segment Reporting, Revenue Reconciling Item [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes									(20.1)	0	0
Long-term Care
Segment Reporting, Revenue Reconciling Item [Line Items]
Impairment of Deferred Acquisition Costs									0	0	(769.6)
Individual Disability - Closed Block
Segment Reporting, Revenue Reconciling Item [Line Items]
Reserve Increase Due to Unlocking									0	0	(183.5)
Group Life | Unum U.S.
Segment Reporting, Revenue Reconciling Item [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes									(49.1)
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax									$ 85.0	$ 0	$ 0

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Schedule I Summary of Investments

12 Months Ended

Dec. 31, 2013

Schedule I - Summary of Investments [Abstract]

Summary of Investment Holdings, Schedule of Investments [Text Block]

SCHEDULE I--SUMMARY OF INVESTMENTS -

OTHER THAN INVESTMENTS IN RELATED PARTIES

Unum Group and Subsidiaries

Type of Investment	Cost or Amortized Cost (1)		Fair Value		Amount shown on the balance sheet
	(in millions of dollars)
Fixed Maturity Securities:
Bonds
United States Government and Government Agencies and Authorities	$	1,028.6	$	1,196.1	$	1,196.1
States, Municipalities, and Political Subdivisions	1,706.0		1,783.2		1,783.2
Foreign Governments	1,226.4		1,373.2		1,373.2
Public Utilities	9,328.9		10,403.0		10,403.0
Mortgage/Asset-Backed Securities	1,858.7		2,039.3		2,039.3
All Other Corporate Bonds	23,108.0		25,511.9		25,511.9
Redeemable Preferred Stocks	33.0		37.7		37.7
Total	38,289.6		$	42,344.4	42,344.4
Mortgage Loans	1,815.1				1,815.1
Policy Loans	3,276.0				3,276.0
Other Long-term Investments
Derivatives	—				10.8		(2)
Equity Securities	11.3				16.4
Miscellaneous Long-term Investments	530.7				538.8		(3)
Short-term Investments	913.4				913.4
Total Investments	$	44,836.1			$	48,914.9

(1) The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

(2) Derivatives are carried at fair value.

(3) The difference between amortized cost and carrying value primarily results from changes in the partnership owner's equity since acquisition.

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Employee Benefit Plans Amounts Recognized in Other Comprehensive Income (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2012 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2013 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Pension Benefits, Non U.S. Plans GBP (£)	Dec. 31, 2012 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2011 Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2012 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2011 Other Postretirement Benefit Plans USD ($)	Dec. 31, 2013 Net Actuarial Gain (Loss) Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2012 Net Actuarial Gain (Loss) Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2013 Net Actuarial Gain (Loss) Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2012 Net Actuarial Gain (Loss) Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Net Actuarial Gain (Loss) Other Postretirement Benefit Plans USD ($)	Dec. 31, 2012 Net Actuarial Gain (Loss) Other Postretirement Benefit Plans USD ($)	Dec. 31, 2013 Prior Service Credit (Cost) Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2012 Prior Service Credit (Cost) Pension Benefits, U.S. Plans USD ($)	Dec. 31, 2013 Prior Service Credit (Cost) Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2012 Prior Service Credit (Cost) Pension Benefits, Non U.S. Plans USD ($)	Dec. 31, 2013 Prior Service Credit (Cost) Other Postretirement Benefit Plans USD ($)	Dec. 31, 2012 Prior Service Credit (Cost) Other Postretirement Benefit Plans USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ (222.4)	$ (549.9)	$ (437.6)	$ (26.0)		$ (27.0)	$ (17.2)	$ 18.5	$ 2.4	$ 10.7
Defined Benefit Plan, Amortization of Net Gains (Losses)	31.7											45.9	1.2	0.5	0	0
Defined Benefit Plan, Curtailments	126.8	0		3.7		0		0	4.2		126.8	0	0	0	0	4.2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax											344.8	(218.2)	(0.2)	(13.4)	29.6	(19.4)
Amortization of Prior Service Cost (Credit)	(0.1)	(0.4)	(0.5)	0		0	0	(4.9)	(2.6)	(2.6)							(0.1)	(0.4)	0	0	(4.9)	(2.6)
Recognized Net Gain (Loss) Due to Curtailments	0.7	0	0	(3.7)	(2.3)	0	0	0	0	0							0.7	0	(3.7)	0	0	0
Defined Benefit Plan, Plan Amendments																	0	0	3.9	0	0	5.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	$ (176.4)	$ 60.4		$ (0.2)		$ 3.1		$ (8.6)	$ 4.5

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Schedule III Supplmentary Insurance Information (Tables)

12 Months Ended

Dec. 31, 2013

Schedule III - Supplementary Insurance Info [Abstract]

Supplementary Information for Insurance Companies

Segment	Deferred Acquisition Costs		Reserves for Future Policy Contract Benefits		Unearned Premiums		Policy and Contract Benefits
	(in millions of dollars)
December 31, 2013
Unum US	$	1,051.5	$	11,788.4	$	47.6	$	889.1
Unum UK	34.3		2,594.3		139.3		160.0
Colonial Life	743.4		1,815.6		30.0		193.7
Closed Block	—		26,900.8		196.9		268.2
Total	$	1,829.2	$	43,099.1	$	413.8	$	1,511.0
December 31, 2012
Unum US	$	1,024.3	$	12,449.3	$	46.1	$	890.3
Unum UK	38.8		2,487.1		142.9		155.7
Colonial Life	692.4		1,691.3		29.9		149.8
Closed Block	—		28,066.7		207.8		288.8
Total	$	1,755.5	$	44,694.4	$	426.7	$	1,484.6

SCHEDULE III--SUPPLEMENTARY INSURANCE INFORMATION

Unum Group and Subsidiaries

(continued from preceding page)

Segment	Premium Income		Net Investment Income (1)			Benefits and Change in Reserves for Future Benefits (2)		Amortization of Deferred Acquisition Costs		All Other Expenses (3)		Premiums Written (4)
	(in millions of dollars)
December 31, 2013
Unum US	$	4,517.1	$	929.6		$	3,222.4	$	230.0	$	1,254.0	$	3,068.0
Unum UK	556.6		148.5			413.3		14.7		145.2		448.1
Colonial Life	1,232.2		145.4			667.0		174.2		271.8		1,011.8
Closed Block	1,318.8		1,272.3			2,293.0		—		282.6		1,307.0
Corporate	—		(3.7		)	—		—		180.4		—
Total	$	7,624.7	$	2,492.1		$	6,595.7	$	418.9	$	2,134.0
December 31, 2012
Unum US	$	4,456.5	$	952.3		$	3,238.6	$	196.5	$	1,251.2	$	3,045.0
Unum UK	694.6		170.8			541.4		15.7		177.1		466.3
Colonial Life	1,194.5		138.6			627.3		166.5		265.3		986.3
Closed Block	1,370.5		1,230.5			2,314.9		—		290.7		1,358.6
Corporate	—		23.0			—		—		180.7		—
Total	$	7,716.1	$	2,515.2		$	6,722.2	$	378.7	$	2,165.0
December 31, 2011
Unum US	$	4,296.0	$	951.4		$	3,113.5	$	188.1	$	1,250.5	$	2,965.8
Unum UK	687.6		189.9			493.8		15.3		178.0		480.0
Colonial Life	1,135.3		132.4			589.4		151.2		257.5		944.9
Closed Block	1,395.3		1,189.7			3,012.8		11.1		496.4		1,385.1
Corporate	—		56.2			—		—		187.1		—
Total	$	7,514.2	$	2,519.6		$	7,209.5	$	365.7	$	2,369.5

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Stockholders' Equity and Earnings Per Common Share Authorized share repurchase programs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Repurchase Program Authorized in December 2013 [Member]	Dec. 31, 2013 Repurchase Program Authorized in July 2012 [Member]	Dec. 31, 2012 Repurchase Program Authorized in July 2012 [Member]	Dec. 31, 2013 Repurchase Program Authorized in February 2011 [Member]	Dec. 31, 2011 Repurchase Program Authorized in February 2011 [Member]	Dec. 31, 2013 Repurchase Program Authorized in May 2010 [Member]	Dec. 31, 2010 Repurchase Program Authorized in May 2010 [Member]
Authorized common stock repurchase programs [Line Items]
Stock Repurchase Program, Authorized Amount	$ 750.0		$ 750.0		$ 1,000.0		$ 500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 730.0	$ 0		$ 0		$ 0

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Stockholders' Equity and Earnings Per Common Share Stockholders' Equity and Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Net income per common share is determined as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	858.1	$	894.4	$	284.2
Denominator (000s)
Weighted Average Common Shares - Basic	264,725.8		281,355.9		302,399.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,223.4		400.9		1,171.2
Weighted Average Common Shares - Assuming Dilution	265,949.2		281,756.8		303,571.0
Net Income Per Common Share
Basic	$	3.24	$	3.18	$	0.94
Assuming Dilution	$	3.23	$	3.17	$	0.94

Authorized common stock repurchase programs

Our board of directors has authorized the repurchase of Unum Group's common stock under the following repurchase programs:

	Share Repurchase Program Authorized During
	December 2013		July 2012		February 2011		May 2010
	(in millions of dollars)
Authorized Repurchase Amount	$	750.0	$	750.0	$	1,000.0	$	500.0
Remaining Repurchase Amount at Year End 2013	$	730.0	$	—	$	—	$	—

The December 2013 share repurchase program has an expiration date of June 12, 2015.

Share Repurchase Table

Common stock repurchases were classified as follows in our consolidated statements of stockholders' equity:

	Year Ended December 31
	2013			2012			2011
	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
Treasury Stock	11.2	$	318.6	23.6	$	500.6	17.7	$	419.9
Retirement of Common Shares	—	—		—	—		7.7	200.0
Total	11.2	$	318.6	23.6	$	500.6	25.4	$	619.9

The cost in the preceding chart includes commissions of $0.2 million, $0.6 million, and $0.3 million for the years ended December 31, 2013, 2012, and 2011, respectively.

In February 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock at our option. The final price adjustment settlement occurred in March 2011, resulting in the delivery to us of 0.6 million additional shares. We retired 7.7 million shares during 2011. All other repurchased shares have been classified as treasury stock.

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Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders Equity Note [Line Items]
Oustanding Stock Options, grant price range, lower limit			$ 11.37
Oustanding Stock Options, grant price range, upper limit			$ 26.29
Outstanding Nonvested stock awards, grant prices range, lower limit			$ 19.38
Outstanding Nonvested stock awards, grant prices range, upper limit			$ 32.35
Weighted Average Grant Date Fair Value of Shares Granted			$ 23.97
Antidilutive common shares not included in the computation of dilutive earnings per share			100,000	2,500,000	2,100,000
Shares Repurchased Cost Commissions			$ 0.2	$ 0.6	$ 0.3
Stock Repurchased During Period, Shares			11,200,000	23,600,000	25,400,000
Preferred stock, authorized			25,000,000
Preferred stock, par value			$ 0.10
Preferred stock, issued			0
Accelerated share repurchase program [Member]
Stockholders Equity Note [Line Items]
Stock Repurchased During Period, Shares	600,000	7,100,000
Treasury Stock, Value, Acquired, Cost Method					$ 200.0
Stock Repurchased and Retired During Period, Shares			0	0	7,700,000

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 858.1	$ 894.4	$ 284.2
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(1,102.8); $467.7; $798.3)	(2,101.2)	918.8	1,519.8
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $743.3; $(325.6); $(701.5))	1,363.4	(660.1)	(1,321.1)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(1.3); $(4.3); $25.2)	(5.3)	(7.1)	47.7
Change in Foreign Currency Translation Adjustment	25.5	45.0	(10.5)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $185.2; $(68.0); $(67.4))	344.6	(130.4)	(125.5)
Total Other Comprehensive Income (Loss)	(373.0)	166.2	110.4
Comprehensive Income	$ 485.1	$ 1,060.6	$ 394.6

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Unrecognized tax benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance at Beginning of Year	$ 17.5	$ 86.9	$ 138.9
Tax Positions Related to Prior Years - Additions	5.7	13.3	4.4
Tax Positions Related to Prior Years - Subtractions	0	(0.6)	(11.8)
Settlements with Tax Authorities	(4.8)	(23.5)	(44.6)
Lapses of Statute of Limitations	0	(61.1)	0
Tax Positions Taken During Current Year	0	2.5	0
Balance at End of Year	18.4	17.5	86.9
Less Tax Attributable to Temporary Items Included Above	(10.2)	(15.0)	(86.9)
Total Unrecognized Tax Benefits that if Recognized Would Affect the Effective Tax Rate	$ 8.2	$ 2.5	$ 0

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Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Significant Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

Basis of Presentation: The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). Such accounting principles differ from statutory accounting principles (see Note 15). Intercompany transactions have been eliminated.

Description of Business: We are the largest provider of group and individual disability products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including life insurance, employer- and employee-paid group benefits, and other related services. We market our products primarily to employers interested in providing benefits to their employees.

We have three principal operating business segments: Unum US, Unum UK, and Colonial Life. Our other reporting segments are Closed Block and Corporate. See Note 13 for further discussion of our operating segments.

Use of Estimates: The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.

Fixed Maturity Securities: Fixed maturity securities include long-term bonds and redeemable preferred stocks. Fixed maturity securities not bought and held for the purpose of selling in the near term but for which we do not have the positive intent and ability to hold to maturity are classified as available-for-sale and reported at fair value. Changes in the fair value of available-for-sale fixed maturity securities, except for amounts related to other-than-temporary impairment losses recognized in earnings, are reported as a component of other comprehensive income. These amounts are net of income tax and valuation adjustments to deferred acquisition costs and reserves for future policy and contract benefits which would have been recorded had the related unrealized gain or loss on these securities been realized.

Interest income is recorded as part of net investment income when earned, using an effective yield method giving effect to amortization of premium and accretion of discount. Included within fixed maturity securities are mortgage-backed and asset-backed securities.  We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income. For fixed maturity securities on which collection of investment income is uncertain, we discontinue the accrual of investment income and recognize investment income when interest and dividends are received. Payment terms specified for fixed maturity securities may include a prepayment penalty for unscheduled payoff of the investment.  Prepayment penalties are recognized as investment income when received.

In determining when a decline in fair value below amortized cost of a fixed maturity security is other than temporary, we evaluate available information, both positive and negative, in reaching our conclusions. In particular, we consider the strength of the issuer's balance sheet, its debt obligations and near-term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income. See Notes 2 and 3.

Mortgage Loans: Mortgage loans are generally held for investment and are carried at amortized cost less an allowance for probable losses. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Prepayment penalties are recognized as investment income when received. For mortgage loans on which collection of interest income is uncertain, we discontinue the accrual of interest and recognize it in the period when an interest payment is received. We typically do not resume the accrual of interest on mortgage loans on nonaccrual status until there are significant improvements in the underlying financial condition of the borrower. We consider a loan to be delinquent if full payment is not received in accordance with the contractual terms of the loan.

We evaluate each of our mortgage loans individually for impairment based on a comprehensive rating system used to evaluate the credit risk of the loan. Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining impairment. If we determine that it is probable we will be unable to collect all amounts due under the contractual terms of a mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. We do not purchase mortgage loans with existing credit impairments. See Note 3.

Policy Loans:Policy loansare presented at unpaid balances directly related to policyholders. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. Included in policy loans are $3,043.7 million and $2,912.7 million of policy loans ceded to reinsurers at December 31, 2013 and 2012, respectively.

Other Long-term Investments:Other long-term investments are comprised primarily of tax credit partnerships and private equity partnerships.

Tax credit partnerships in which we have invested were formed for the purpose of investing in the construction and rehabilitation of low-income housing.  Because the partnerships are structured such that there is no return of principal, the primary sources of investment return from our tax credit partnerships are tax credits and tax benefits derived from passive losses on the investments, both of which may exhibit variability over the life of the investment.  These partnerships are accounted for using either the equity or the effective yield method, depending primarily on whether the tax credits are guaranteed through a letter of credit, a tax indemnity agreement, or another similar arrangement. Tax credits received from these partnerships are reported in our consolidated statements of income as either a reduction of state premium taxes, which are a component of other expenses, or a reduction of income tax. For those partnerships accounted for under the equity method, the amortization of the principal amount invested in these partnerships is reported as a component of net investment income. For those partnerships accounted for under the effective yield method, amortization of the principal amount invested is reported as a component of income tax or other expenses.

Our investments in private equity partnerships are passive in nature.  The underlying investments held by these partnerships include both equity and debt securities and are accounted for using the equity or cost method, depending on the level of ownership and the degree of our influence over partnership operating and financial policies. For partnerships accounted for under the equity method, our portion of partnership earnings is reported as a component of net investment income in our consolidated statements of income. For those partnerships accounted for under the cost method, we record income received from partnership distributions as either a component of net investment income or net realized investment gain or loss, in accordance with the source of the funds distributed from the partnership. See Notes 2 and 3.

Short-term Investments:Short-term investments are carried at cost. Short-term investments include investments maturing within one year, such as corporate commercial paper and U.S. Treasury bills, bank term deposits, and other cash accounts and cash equivalents earning interest. See Note 2.

Cash and Bank Deposits: Cash and bank deposits include cash on hand and non-interest bearing cash and deposit accounts.

Derivative Financial Instruments: Derivative financial instruments (including certain derivative instruments embedded in other contracts) are recognized as either other long-term investments or other liabilities in our consolidated balance sheets and are reported at fair value. The accounting for a derivative depends on whether it has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. To qualify for hedge accounting, at the inception of the hedging transaction, we formally document the risk management objective and strategy for undertaking the hedging transaction, as well as the designation of the hedge as either a fair value hedge or a cash flow hedge. Included in this documentation is how the hedging instrument is expected to hedge the designated risk(s) related to specific assets or liabilities on the balance sheet or to specific forecasted transactions as well as a description of the method that will be used to retrospectively and prospectively assess the hedging instrument's effectiveness and the method that will be used to measure ineffectiveness.

A derivative designated as a hedging instrument must be assessed as being highly effective in offsetting the designated risk(s) of the hedged item. Hedge effectiveness is formally assessed at inception and periodically throughout the life of the designated hedging relationship, using qualitative and quantitative methods. Qualitative methods include comparison of critical terms of the derivative to the hedged item. Quantitative methods include regression or other statistical analysis of changes in fair value or cash flows associated with the hedge relationship.

Changes in the fair value of a derivative designated as a fair value hedge, including amounts measured as ineffectiveness, and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.  The gain or loss on the termination of a fair value hedge is recognized in earnings as a component of net realized investment gain or loss during the period in which the termination occurs. When interest rate swaps are used in hedge accounting relationships, periodic settlements are recorded in the same income statement line as the related settlements of the hedged items.

To the extent it is effective, changes in the fair value of a derivative designated as a cash flow hedge are reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings. The ineffective portion of the hedge, if any, is recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. The gain or loss on the termination of an effective cash flow hedge is reported in other comprehensive income and reclassified into earnings and reported on the same income statement line item as the hedged item and in the same period or periods during which the hedged item affects earnings.

Gains or losses on the termination of ineffective fair value or cash flow hedges are reported in earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of or the anticipated transaction being hedged is no longer likely to occur, we will terminate the related derivative and recognize the gain or loss on termination in current earnings as a component of net realized investment gain or loss. In the event a hedged item is disposed of subsequent to the termination of the hedging transaction, we reclassify any remaining gain or loss on the cash flow hedge out of accumulated other comprehensive income into earnings as a component of the same income statement line item wherein we report the gain or loss on disposition of the hedged item.

For a derivative not designated as a hedging instrument, changes in the fair value of the derivative, together with the payment of periodic fees, if applicable, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

Cash flow activity from the settlement of derivative contracts is reported in the consolidated statements of cash flows as a component of proceeds from sales and maturities of other investments.

In our consolidated balance sheets, we do not offset fair value amounts recognized for derivatives executed with the same counterparty under a master netting agreement and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from those master netting agreements. See Notes 2 and 4.

Fair Value Measurement: Certain assets and liabilities are reported at fair value in our consolidated balance sheets and in our notes to our consolidated financial statements. We define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value represents an exit price, not an entry price. The exit price objective applies regardless of our intent and/or ability to sell the asset or transfer the liability at the measurement date. Assets or liabilities with readily available actively quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. When actively quoted prices are not available, fair values are based on quoted prices in markets that are not active, quoted prices for similar but not identical assets or liabilities, or other observable inputs. If observable inputs are not available, unobservable inputs and/or adjustments to observable inputs requiring management judgment are used to determine fair value. We categorize our assets and liabilities measured at estimated fair value into a three-level hierarchy, based on the significance of the inputs. The fair value hierarchy gives the highest priority to inputs which are unadjusted and represent quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). See Note 2.

Realized Investment Gains and Losses: Realized investment gains and losses are reported as a component of revenue in the consolidated statements of income and are based upon specific identification of the investments sold. See Note 3.

Deferred Acquisition Costs: Incremental direct costs associated with the successful acquisition of new or renewal insurance contracts have been deferred. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from deferral. Deferred acquisition costs are subject to recoverability testing at the time of policy issue and loss recognition testing in subsequent years.

Deferred acquisition costs related to traditional policies are amortized over the premium paying period of the related policies in proportion to the ratio of the present value of annual expected premium income to the present value of total expected premium income. Deferred acquisition costs related to interest-sensitive policies are amortized over the lives of the policies in relation to the present value of estimated gross profits from surrender charges, mortality margins, investment returns, and expense margins. Deviations from projections result in a change to the rate of amortization in the period during which such events occur. Generally, the amortization periods for these policies approximate the estimated lives of the policies.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. Unamortized deferred acquisition costs from the original policy continue to be amortized over the expected life of the new policy, and the costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions, principally on group contracts, that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. Unamortized deferred acquisition costs on the original policy that was replaced are immediately expensed, and the costs of acquiring the new policy are capitalized and amortized in accordance with our accounting policies for deferred acquisition costs.

Loss recognition is performed on an annual basis, or more frequently if appropriate, using best estimate assumptions as to future experience as of the date of the test. Insurance contracts are grouped for each major product line within a segment when we perform the loss recognition tests. If loss recognition testing indicates that deferred acquisition costs are not recoverable, the deficiency is charged to expense.

Goodwill: Goodwill is the excess of the amount paid to acquire a business over the fair value of the net assets acquired. We review the carrying amount of goodwill for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the carrying amount might not be recoverable. Goodwill impairment testing compares the fair value of a reporting unit with its carrying amount, including goodwill.  The fair values of the reporting units are determined using discounted cash flow models.  The critical estimates necessary in determining fair value are projected earnings and the discount rate.  We set our discount rate assumption based on an expected risk adjusted cost of capital.  If the fair value of the reporting unit to which the goodwill relates is less than the carrying amount of the unamortized goodwill, the carrying amount is reduced with a corresponding charge to expense. 

Property and Equipment: Property and equipment is reported at cost less accumulated depreciation, which is calculated on the straight-line method over the estimated useful life. The accumulated depreciation for property and equipment was $760.8 million and $705.0 million as of December 31, 2013 and 2012, respectively.

Value of Business Acquired: Value of business acquired represents the present value of future profits recorded in connection with the acquisition of a block of insurance policies. The asset is amortized based upon expected future premium income for traditional insurance policies and estimated future gross profits from surrender charges, mortality margins, investment returns, and expense margins for interest-sensitive insurance policies. The value of business acquired, which is included in other assets in our consolidated balance sheets, was $19.0 million and $23.5 million at December 31, 2013 and 2012, respectively. The accumulated amortization for value of business acquired was $138.2 million and $131.5 million as of December 31, 2013 and 2012, respectively.

The amortization of value of business acquired, which is included in other expenses in the consolidated statements of income, was $4.5 million, $7.5 million, and $7.4 million for the years ended December 31, 2013, 2012, and 2011, respectively. We periodically review the carrying amount of value of business acquired using the same methods used to evaluate deferred acquisition costs.

Policy and Contract Benefits: Policy and contract benefits represent amounts paid and expected to be paid based on reported losses and estimates of incurred but not reported losses for traditional life and accident and health products. For interest-sensitive products, benefits are the amounts paid and expected to be paid on insured claims in excess of the policyholders' policy fund balances.

Reserves for Policy and Contract Benefits: Policy reserves represent future policy and contract benefits for claims not yet incurred. Policy reserves for traditional life and accident and health products are determined using the net level premium method. The reserves are calculated based upon assumptions as to interest, persistency, morbidity, and mortality that were appropriate at the date of issue. Interest rate assumptions are based on actual and expected net investment returns. Persistency assumptions are based on our actual historical experience adjusted for future expectations. Morbidity and mortality assumptions are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by plan, year of issue, and policy duration and include a provision for adverse deviation.

Policy reserves for group single premium annuities have been provided on a net single premium method. The reserves are calculated based on assumptions as to interest, mortality, and retirement that were appropriate at the date of issue. Mortality assumptions are based upon industry standards adjusted as appropriate to reflect our actual experience and future expectations. The assumptions vary by year of issue.

Policy reserves for interest-sensitive products are principally policyholder account values.

We perform loss recognition tests on our policy reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency.

Claim reserves represent future policy and contract benefits for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Our claim reserves relate primarily to disability policies and are calculated based on assumptions as to interest and claim resolution rates that are currently appropriate. Claim resolution rate assumptions are based on our actual experience. The interest rate assumptions used for discounting claim reserves are based on projected portfolio yield rates, after consideration for defaults and investment expenses, for the assets supporting the liabilities for the various product lines. Unlike policy reserves for which assumptions are generally established and locked in at the time of policy issuance, claim reserves are subject to revision as current claim experience and projections of future experience change. See Note 6.

Policyholders' Funds: Policyholders' funds represent customer deposits plus interest credited at contract rates. We control interest rate risk by investing in quality assets which have an aggregate duration that closely matches the expected duration of the liabilities.

Income Tax: Deferred taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial statement purposes and the amounts used for income tax purposes. Deferred taxes have been measured using enacted statutory income tax rates and laws that are currently in effect. We record deferred tax assets for tax positions taken in the U.S. and other tax jurisdictions based on our assessment of whether a position is more likely than not to be sustained upon examination based solely on its technical merits.  A valuation allowance is established for deferred tax assets when it is more likely than not that an amount will not be realized. See Note 7.

Short-term and Long-term Debt: Debt is generally carried at the unpaid principal balance, net of unamortized discount or premium. Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements and repurchase agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty. Original issue discount or premium as well as debt issue costs are recognized as a component of interest expense over the period the debt is expected to be outstanding. The carrying amount of long-term debt that is part of a fair value hedge program includes an adjustment to reflect the effect of the change in fair value attributable to the risk being hedged. Net interest settlements for fair value hedges on our long-term debt are recognized as a component of interest expense. See Note 8.

Treasury Stock and Retirement of Common Stock: Treasury stock is reflected as a reduction of stockholders' equity at cost. When shares are retired, the par value is removed from common stock, and the excess of the repurchase price over par is allocated between additional paid-in capital and retained earnings.

Revenue Recognition: Traditional life and accident and health products are long-duration contracts, and premium income is recognized as revenue when due from policyholders. If the contracts are experience rated, the estimated ultimate premium is recognized as revenue over the period of the contract. The estimated ultimate premium, which is revised to reflect current experience, is based on estimated claim costs, expenses, and profit margins.

For interest-sensitive products, the amounts collected from policyholders are considered deposits, and only the deductions during the period for cost of insurance, policy administration, and surrenders are included in revenue. Policyholders' funds represent funds deposited by contract holders and are not included in revenue.

Fees from our administrative-services only and family medical leave products are reported as other income when services are rendered.

Reinsurance: We routinely enter into reinsurance agreements with other insurance companies to spread risk and thereby limit losses from large exposures. For each of our reinsurance agreements, we determine if the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. If we determine that a reinsurance agreement does not expose the reinsurer to a reasonable possibility of a significant loss from insurance risk, we record the agreement using the deposit method of accounting.  

Reinsurance activity is accounted for on a basis consistent with the terms of the reinsurance contracts and the accounting used for the original policies issued. Premium income and benefits and change in reserves for future benefits are presented in our consolidated statements of income net of reinsurance ceded. Ceded liabilities for policy and contract benefits, future policy and contract benefits, and unearned premiums are reported on a gross basis in our consolidated balance sheets, as are ceded policy loans. Our reinsurance recoverable includes the balances due from reinsurers under the terms of the reinsurance agreements for these ceded balances as well as settlement amounts currently due.

Where applicable, gains or losses on reinsurance transactions are deferred and amortized into earnings based upon expected future premium income for traditional insurance policies and estimated future gross profits for interest-sensitive insurance policies. The deferred gain on reinsurance included in other liabilities in our consolidated balance sheets at December 31, 2013 and 2012 was $53.6 million and $67.4 million, respectively.

Under ceded reinsurance agreements wherein we are not relieved of our legal liability to our policyholders, if the assuming reinsurer is unable to meet its obligations, we remain contingently liable. We evaluate the financial condition of reinsurers and monitor concentration of credit risk to minimize this exposure. We may also require assets in trust, letters of credit, or other acceptable collateral to support our reinsurance recoverable balances. In the event that reinsurers do not meet their obligations to us under the terms of the reinsurance agreements, certain amounts reported in our reinsurance recoverable could become uncollectible, in which case the reinsurance recoverable balances are stated net of allowances for uncollectible reinsurance. See Note 12.

Premium Tax Expense: Premium tax expense is included in other expenses in the consolidated statements of income. For the years ended December 31, 2013, 2012, and 2011, premium tax expense was $137.0 million, $136.0 million, and $134.9 million, respectively.

Stock-Based Compensation: The cost of stock-based compensation is generally measured based on the grant-date fair value of the award. The Black-Scholes options valuation model is used for estimating the fair value of stock options, and the Monte-Carlo valuation model is used for estimating the fair value of performance share units. Restricted stock units are valued based on the fair value of common stock at the grant date, and cash-settled awards are measured each reporting period based on the current stock price. Stock-based awards are expensed over the requisite service period, with an offsetting increase to additional paid-in capital in stockholders' equity. See Note 11.

Earnings Per Share: We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. Earnings per share assuming dilution is computed by dividing net income by the weighted average number of shares outstanding for the period plus the shares representing the dilutive effect of stock-based awards. In computing earnings per share assuming dilution, only potential common shares resulting from stock-based awards that are dilutive (those that reduce earnings per share) are included. We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards on the computation of earnings per share assuming dilution. See Note 10.

Translation of Foreign Currency: Revenues and expenses of our foreign operations are translated at average exchange rates. Assets and liabilities are translated at the rate of exchange on the balance sheet dates. The translation gain or loss is generally reported in accumulated other comprehensive income, net of deferred tax. We do not provide for deferred taxes to the extent unremitted foreign earnings are deemed permanently invested.

Accounting for Participating Individual Life Insurance: Participating policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual to a stock life insurance company will remain participating as long as the policies remain in-force. A Participation Fund Account (PFA) was established for the benefit of all such individual participating life and annuity policies and contracts. The assets of the PFA provide for the benefit, dividend, and certain expense obligations of the participating individual life insurance policies and annuity contracts. The assets of the PFA were $339.2 million and $380.4 million at December 31, 2013 and 2012, respectively.

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 815 "Derivatives and Hedging"

In July 2013, the FASB issued an update which allows entities to use the Fed Funds Effective Swap Rate, also referred to as the Overnight Index Swap Rate (OIS), as a benchmark interest rate for hedge accounting purposes. Previously the only acceptable benchmark rates for hedge accounting purposes under GAAP were U.S. Treasury rates and the London Interbank Offered Rate (LIBOR) swap rate. This update reflects the evolution of market hedging practices and is intended to provide more flexibility in hedging interest rate risk. We adopted this update effective July 17, 2013 for qualifying new or redesignated hedging relationships entered into on or after that date.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the FASB issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. We adopted this update effective January 1, 2012. The adoption of this update modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods in our consolidated financial statements and accompanying notes.

Accounting Updates Adopted in 2011:

ASC 310 "Receivables"

In April 2011, the FASB issued an update to provide additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted this update effective July 1, 2011. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 323 "Investments - Equity Method and Joint Ventures"

In January 2014, the FASB issued an update to provide guidance on the accounting and reporting for investments in affordable housing projects that qualify for low-income housing tax credits. The amendments in the update permit entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). Additional disclosures concerning investments in qualified affordable housing projects will also be required by the update. The amendments in the update are effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted, and are to be applied retrospectively. We have not yet finalized the expected impact on our financial position or results of operations.

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Fair Value of Financial Instruments Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,276.0	[1]	$ 3,133.8
Long-term Debt	2,612.0		2,755.4
Gain (Loss) on Embedded Derivative	30.7		51.8	(39.4)
Other Than Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	94.00%
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	1,329.2		1,212.0
Fair Value, Inputs, Level 1 | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	6.00%
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	1,495.2		1,756.8
Fair Value, Inputs, Level 2 | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	76.00%
Fair Value, Inputs, Level 2 | Other Observable Market Data
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	4.10%
Fair Value Inputs Level 2 Or Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	13.90%
Ceded Policy Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,043.7		$ 2,912.7

[1] (1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and/or accretion of discounts.

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Liability for Unpaid Claims - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	$ 95.5
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	85.0
Impairment of Intangible Assets, Finite-lived	0	0	196.0
Unum U.S.
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	75.4	0	0
Unum U.S. | Group Life
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	49.1
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	85.0	0	0
Unum U.S. | VoluntaryLife [Domain]
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	26.3
Colonial Life
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	20.1	0	0
Colonial Life | Colonial_Voluntary_Life [Domain]
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes	20.1
Closed Block
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Impairment of Intangible Assets, Finite-lived			196.0
Long-term Care
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Impairment of Intangible Assets, Finite-lived	0	0	769.6
Individual Disability - Closed Block
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Reserve Increase Due to Unlocking	0	0	183.5
Claim Reserve Prior Year [Member] | Unum U.S. | Group Life
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	78.0
Claim Reserve Prior Year [Member] | Long-term Care
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Reserve Increase Due to Unlocking		215.0
Claim Reserve Prior Year [Member] | Individual Disability - Closed Block
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Reserve Increase Due to Unlocking		176.0
Claim Reserve Total [Member] | Long-term Care
Liability for Unpaid Claims and CAE Narrative Information [Line Items]
Impairment of Intangible Assets, Finite-lived		573.6
Reserve Increase Due to Unlocking			$ 248.1

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Stockholders' Equity and Earnings Per Common Share Share Repurchases (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Repurchase Table [Line Items]
Stock Repurchased During Period, Shares			11.2	23.6	25.4
Stock Repurchased During Period, Value			$ 318.6	$ 500.6	$ 619.9
shares repurchased on the open market [Member]
Share Repurchase Table [Line Items]
Treasury Stock, Shares, Acquired			11.2	23.6	17.7
Treasury Stock Acquired in Open Market Value			318.6	500.6	419.9
Accelerated share repurchase program [Member]
Share Repurchase Table [Line Items]
Stock Repurchased and Retired During Period, Shares			0	0	7.7
Stock Repurchased and Retired During Period, Value			$ 0	$ 0	$ 200.0
Stock Repurchased During Period, Shares	0.6	7.1

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Investments Offsetting for Derivatives and Securities Lending Balances (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Offsetting Derivative Assets [Abstract]
Gross Derivative Asset	$ 10.8	$ 81.6
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet	0	0
Net Derivative Assets Reported in Balance Sheet	10.8	81.6
Securities Received as Collateral on Derivative Assets	(9.5)	(72.9)
Cash collateral from counterparties	(1.1)	0
Derivative Assets Net of Collateral	0.2	8.7
Offsetting Securities Borrowed [Abstract]
Gross Securities Borrowed	201.6	452.8
Liabilities Offsetting Securities Borrowed in Balance Sheet	0	0
Net Securities Borrowed Reported in Balance Sheet	201.6	452.8
Securities Received as Collateral on Securities Borrowed	(125.1)	0
Cash Received as Collateral on Securities Borrowed	(76.5)	(452.8)
Securities Borrowed Net of Collateral	0	0
Offsetting Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed [Abstract]
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	212.4	534.4
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability	0	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	212.4	534.4
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Securities	(134.6)	(72.9)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash	(77.6)	(452.8)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral	0.2	8.7
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	135.6	170.5
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	135.6	170.5
Derivative, Collateral, Right to Reclaim Securities	(98.6)	(129.8)
Derivative, Collateral, Right to Reclaim Cash	0	(1.8)
Derivative Liability, Fair Value, Amount Offset Against Collateral	37.0	38.9
Offsetting Securities Loaned [Abstract]
Securities Loaned, Gross	76.5	455.8
Securities Loaned, Asset	0	0
Securities Loaned, Collateral, Right to Reclaim Securities	(76.5)	(452.8)
Securities Loaned, Collateral, Right to Reclaim Cash	0	0
Securities Loaned, Amount Offset Against Collateral	0	3.0
Offsetting Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned [Abstract]
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Gross	212.1	626.3
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Asset	0	0
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned	212.1	626.3
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Collateral, Right to Reclaim Securities	(175.1)	(582.6)
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Collateral, Right to Reclaim Cash	0	(1.8)
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Amount Offset Against Collateral	$ 37.0	$ 41.9

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Condensed Finacial Information of Registrant

12 Months Ended

Dec. 31, 2013

Schedule II - Condensed Financial Info [Abstract]

Condensed Financial Information of Parent Company Only Disclosure

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT

Unum Group (Parent Company)

BALANCE SHEETS

	December 31
	2013			2012
	(in millions of dollars)
Assets
Fixed Maturity Securities - at fair value (amortized cost: $143.9; $217.7)	$	145.3		$	224.6
Other Long-term Investments	57.2			73.0
Short-term Investments	164.0			433.5
Investment in Subsidiaries	10,082.8			10,079.1
Deferred Income Tax	68.1			234.1
Other Assets	558.8			489.1
Total Assets	$	11,076.2		$	11,533.4
Liabilities and Stockholders' Equity
Liabilities
Short-term Debt	$	0.3		$	6.6
Long-term Debt	1,875.2			1,896.2
Pension and Postretirement Benefits	295.3			801.6
Other Liabilities	246.3			216.4
Total Liabilities	2,417.1			2,920.8
Stockholders' Equity
Common Stock	36.1			36.0
Additional Paid-in Capital	2,634.1			2,607.7
Accumulated Other Comprehensive Income	255.0			628.0
Retained Earnings	8,083.2			7,371.6
Treasury Stock	(2,349.3		)	(2,030.7		)
Total Stockholders' Equity	8,659.1			8,612.6
Total Liabilities and Stockholders' Equity	$	11,076.2		$	11,533.4

See notes to condensed financial information.

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

STATEMENTS OF INCOME

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Dividends from Subsidiaries	$	636.6		$	670.8		$	800.0
Other Income	56.9			55.0			65.0
Total Revenue	693.5			725.8			865.0
Interest and Debt Expense	120.9			114.2			112.1
Other Expenses	48.9			65.5			57.7
Total Expenses	169.8			179.7			169.8
Income Before Income Tax of Parent Company	523.7			546.1			695.2
Income Tax Benefit	(14.7		)	(25.7		)	(13.9		)
Income of Parent Company	538.4			571.8			709.1
Equity in Undistributed Earnings (Loss) of Subsidiaries	319.7			322.6			(424.9		)
Net Income	858.1			894.4			284.2
Other Comprehensive Income (Loss), Net of Tax	(373.0		)	166.2			110.4
Comprehensive Income	$	485.1		$	1,060.6		$	394.6

See notes to condensed financial information.

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

STATEMENTS OF CASH FLOWS

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Cash Provided by Operating Activities	$	612.5		$	677.3		$	827.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	—			—			133.9
Proceeds from Maturities of Fixed Maturity Securities	38.5			47.7			44.5
Proceeds from Sales and Maturities of Other Investments	9.4			1.0			—
Purchase of Fixed Maturity Securities	(139.8		)	(99.1		)	—
Purchase of Other Investments	—			(13.7		)	(3.0		)
Net Sales of Short-term Investments	269.5			40.4			192.8
Cash Distributions to Subsidiaries	(225.1		)	(175.2		)	(166.1		)
Acquisition of Property and Equipment	(78.8		)	(80.4		)	(81.1		)
Other, Net	(0.9		)	0.1			0.2
Cash Provided (Used) by Investing Activities	(127.2		)	(279.2		)	121.2
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(6.3		)	4.1			(222.6		)
Issuance of Long-term Debt	—			246.4			—
Issuance of Common Stock	11.4			4.9			14.8
Repurchase of Common Stock	(317.2		)	(496.7		)	(619.9		)
Dividends Paid to Stockholders	(146.5		)	(133.8		)	(121.0		)
Other, Net	(0.3		)	1.6			—
Cash Used by Financing Activities	(458.9		)	(373.5		)	(948.7		)
Increase in Cash	$	26.4		$	24.6		$	0.3

See notes to condensed financial information.

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

NOTES TO CONDENSED FINANCIAL INFORMATION

Note 1 - Basis of Presentation

The accompanying condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto of Unum Group and subsidiaries.

Note 2 - Debt

Long-term and short-term debt consists of the following:

	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Notes @ 5.75% due 2042, callable at or above par	$	248.6		$	248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	1,875.2			1,896.2
Short-term Debt
Securities Lending Agreements	0.3			6.6
Total	$	1,875.5		$	1,902.8

The junior subordinated debt securities due 2038 are callable under limited, specified circumstances. The remaining callable debt may be redeemed, in whole or in part, at any time. The aggregate contractual principal maturities are $350.0 million in 2016, $200.0 million in 2018, and $1,332.6 million in 2020 and thereafter.

Unsecured Notes

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $600.0 million notional amount interest rate swaps which effectively convert certain of our unsecured senior notes into floating rate debt. Under these agreements, we receive fixed rates of interest and pay variable rates of interest, based off of the three-month London Interbank Offered Rate (LIBOR).

Junior Subordinated Debt Securities

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures to the trust in connection with the capital securities offering. The debentures mature in 2038. The sole assets of the trust are the junior subordinated debt securities.

SCHEDULE II--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Continued)

Unum Group (Parent Company)

NOTES TO CONDENSED FINANCIAL INFORMATION - CONTINUED

Short-term Debt

Short-term debt consists of debt due within the next twelve months, including that portion of debt otherwise classified as long-term, and securities lending agreements collateralized by cash. We account for all of our securities lending agreements as collateralized financings, and the carrying amount of the related short-term debt represents our liability to return cash collateral to the counterparty.

In 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

Interest and Debt Expense

Interest paid on long-term and short-term debt and related securities during 2013, 2012, and 2011 was $116.5 million, $109.0 million, and $115.6 million, respectively.

Credit Facility

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600.0 million. Borrowings under the credit facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility provides for interest rates based on either the prime rate or LIBOR. At December 31, 2013, no amount was outstanding on the facility.

Note 3 - Guarantees

In 2005, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued $400.0 million of 6.85% senior debentures due 2015. As of December 31, 2013, $296.9 million of these debentures, which we fully and unconditionally guarantee, were outstanding.

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Selected Operating Statement Data by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Premium Income	$ 1,890.7	$ 1,897.3	$ 1,905.8	$ 1,930.9	$ 1,937.2	$ 1,929.4	$ 1,927.6	$ 1,921.9	$ 7,624.7	$ 7,716.1	$ 7,514.2
Net Investment Income	629.4	615.5	626.1	621.1	643.0	619.2	633.5	619.5	2,492.1	2,515.2	2,519.6
Other Income									230.2	227.9	249.1
Operating Revenue									10,347.0	10,459.2	10,282.9
Operating Income (Loss)									1,241.8	1,239.7	1,323.2
Interest and Debt Expense									149.4	145.4	143.3
Depreciation, Depletion and Amortization									509.8	468.5	455.0
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income									4,517.1	4,456.5	4,296.0
Net Investment Income									929.6	952.3	951.4
Other Income									128.3	124.6	121.6
Operating Revenue									5,575.0	5,533.4	5,369.0
Operating Income (Loss)									859.0	847.1	816.9
Interest and Debt Expense									0.1	1.1	1.0
Depreciation, Depletion and Amortization									292.5	255.6	245.9
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income									556.6	694.6	687.6
Net Investment Income									148.5	170.8	189.9
Other Income									0.1	0.1	0.3
Operating Revenue									705.2	865.5	877.8
Operating Income (Loss)									132.0	131.3	190.7
Interest and Debt Expense									0	0	0
Depreciation, Depletion and Amortization									22.5	27.2	26.8
Colonial Life
Segment Reporting Information [Line Items]
Premium Income									1,232.2	1,194.5	1,135.3
Net Investment Income									145.4	138.6	132.4
Other Income									0.2	0.3	0.5
Operating Revenue									1,377.8	1,333.4	1,268.2
Operating Income (Loss)									284.9	274.3	270.1
Interest and Debt Expense									0	0	0
Depreciation, Depletion and Amortization									188.7	181.0	164.6
Closed Block
Segment Reporting Information [Line Items]
Premium Income									1,318.8	1,370.5	1,395.3
Net Investment Income									1,272.3	1,230.5	1,189.7
Other Income									93.9	100.1	106.1
Operating Revenue									2,685.0	2,701.1	2,691.1
Operating Income (Loss)									109.4	95.5	123.9
Interest and Debt Expense									8.4	10.4	10.5
Depreciation, Depletion and Amortization									5.2	3.9	16.9
Corporate
Segment Reporting Information [Line Items]
Premium Income									0	0	0
Net Investment Income									(3.7)	23.0	56.2
Other Income									7.7	2.8	20.6
Operating Revenue									4.0	25.8	76.8
Operating Income (Loss)									(143.5)	(108.5)	(78.4)
Interest and Debt Expense									140.9	133.9	131.8
Depreciation, Depletion and Amortization									$ 0.9	$ 0.8	$ 0.8

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Parent Company Statement of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Other Income									$ 230.2	$ 227.9	$ 249.1
Total Revenue	2,586.2	2,540.9	2,601.9	2,624.8	2,658.2	2,628.0	2,617.9	2,611.3	10,353.8	10,515.4	10,278.0
Income Before Income Tax	305.8	284.1	311.5	303.8	322.7	320.4	296.4	310.0	1,205.2	1,249.5	333.3
Income Tax Expense (Benefit)									347.1	355.1	49.1
Net Income	221.2	205.7	218.6	212.6	233.9	230.2	216.4	213.9	858.1	894.4	284.2
Total Other Comprehensive Income (Loss)									(373.0)	166.2	110.4
Comprehensive Income									485.1	1,060.6	394.6
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash Dividends from Subsidiaries									636.6	670.8	800.0
Other Income									56.9	55.0	65.0
Total Revenue									693.5	725.8	865.0
Interest and Debt Expense									120.9	114.2	112.1
Other Expenses									48.9	65.5	57.7
Total Expenses									169.8	179.7	169.8
Income Before Income Tax									523.7	546.1	695.2
Income Tax Expense (Benefit)									(14.7)	(25.7)	(13.9)
Income of Parent Company									538.4	571.8	709.1
Equity in Undistibuted Earnings (Loss) of Subsidiaries									319.7	322.6	(424.9)
Net Income									858.1	894.4	284.2
Total Other Comprehensive Income (Loss)									(373.0)	166.2	110.4
Comprehensive Income									$ 485.1	$ 1,060.6	$ 394.6

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Unaudited Quarterly Results - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Unaudited Quarterly Results - Additional Information [Abstract]
Unclaimed Death Benefit Reserve Increase Before Taxes	$ 95.5
Unclaimed Death Benefit Reserve Increase After Tax	62.1
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax	85.0
Waiver of Premium Benefit Reserve Decrease After Tax	$ 55.2

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Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives Fair Value	$ 10.8	$ 81.6
Liability Derivatives Fair Value	135.6	170.5
Designated as Hedging Instrument | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	10.8	81.6
Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	133.7	170.5
Designated as Hedging Instrument | Interest Rate Swaps | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	9.2	76.5
Designated as Hedging Instrument | Interest Rate Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	35.0	31.7
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	1.6	5.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	98.7	138.8
Not Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	55.1
Not Designated as Hedging Instrument | Credit Default Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	1.9
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	$ 53.2	$ 83.9

XML

Income Tax (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Total income tax expense (benefit) is allocated as follows:

	Year Ended December 31
	2013			2012			2011
	(in millions of dollars)
Net Income	$	347.1		$	355.1		$	49.1
Stockholders' Equity - Additional Paid-in Capital
Stock-Based Compensation	(0.8		)	3.5			(3.3		)
Stockholders' Equity - Accumulated Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment	(1,102.8		)	467.7			798.3
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	743.3			(325.6		)	(701.5		)
Change in Net Gain on Cash Flow Hedges	(1.3		)	(4.3		)	25.2
Change in Unrecognized Pension and Postretirement Benefit Costs	185.2			(68.0		)	(67.4		)
Total	$	170.7		$	428.4		$	100.4

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the income tax expense (benefit) attributable to income from operations before income tax, computed at U.S. federal statutory tax rates, to the income tax expense (benefit) as included in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
Statutory Income Tax	35.0	%	35.0	%	35.0	%
Prior Year Taxes	(0.1	)	(0.9	)	(11.0	)
Foreign Items	(1.9	)	(2.0	)	(0.3	)
Tax Credits	(3.4	)	(2.7	)	(5.9	)
Other Items, Net	(0.8	)	(1.0	)	(3.1	)
Effective Tax	28.8	%	28.4	%	14.7	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Our net deferred tax liability consists of the following. Certain prior year amounts have been reclassified to conform to current year reporting.

	December 31
	2013		2012
	(in millions of dollars)
Deferred Tax Liability
Deferred Acquisition Costs	$	70.0	$	39.3
Fixed Assets	80.3		74.1
Invested Assets	1,274.3		2,342.8
Other	54.4		63.2
Gross Deferred Tax Liability	1,479.0		2,519.4
Deferred Tax Asset
Reserves	1,180.1		1,934.2
Employee Benefits	151.2		315.2
Other	3.4		0.6
Gross Deferred Tax Asset	1,334.7		2,250.0
Total Net Deferred Tax Liability	$	144.3	$	269.4

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Our consolidated statements of income include amounts subject to both domestic and foreign taxation. The income and related tax expense (benefit) are as follows:

	Year Ended December 31
	2013		2012			2011
	(in millions of dollars)
Income Before Tax
United States - Federal	$	1,072.0	$	1,128.4		$	160.5
Foreign	133.2		121.1			172.8
Total	$	1,205.2	$	1,249.5		$	333.3
Current Tax Expense
United States - Federal	$	277.9	$	164.4		$	218.4
Foreign	18.7		42.2			12.1
Total	296.6		206.6			230.5
Deferred Tax Expense (Benefit)
United States - Federal	47.3		173.5			(203.4		)
Foreign	3.2		(25.0		)	22.0
Total	50.5		148.5			(181.4		)
Total	$	347.1	$	355.1		$	49.1

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

Our consolidated statements of income include the following changes in unrecognized tax benefits:

	December 31
	2013			2012			2011
	(in millions of dollars)
Balance at Beginning of Year	$	17.5		$	86.9		$	138.9
Tax Positions Taken During Prior Years
Additions	5.7			13.3			4.4
Subtractions	—			(0.6		)	(11.8		)
Settlements with Tax Authorities	(4.8		)	(23.5		)	(44.6		)
Lapses of Statute of Limitations	—			(61.1		)	—
Tax Positions Taken During Current Year	—			2.5			—
Balance at End of Year	18.4			17.5			86.9
Less Tax Attributable to Temporary Items Included Above	(10.2		)	(15.0		)	(86.9		)
Total Unrecognized Tax Benefits that if Recognized Would Affect the Effective Tax Rate	$	8.2		$	2.5		$	—

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments

Description of Stock Plans

Under the stock incentive plan of 2012 (the 2012 Plan), up to 20 million shares of common stock are available for awards to our employees, officers, consultants, and directors.  Awards may be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, performance share units, and other stock-based awards.  Each full-value award, defined as any award other than a stock option or stock appreciation right, is counted as 1.76 shares. The exercise price for stock options issued cannot be less than the fair value of the underlying common stock as of the grant date. Stock options generally have a term of eight years after the date of grant and vest after three years.  At December 31, 2013, approximately 18.31 million shares were available for future grants under the 2012 Plan.

Under the stock incentive plan of 2007 (the 2007 Plan), which was terminated in May 2012 for purposes of any further grants, up to 35 million shares of common stock were available for awards to our employees, officers, consultants, and directors. Awards could be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units, performance share units, and other stock-based awards.  Each full-value award, defined as any award other than a stock option or stock appreciation right, is counted as 2.7 shares. Awards granted before the termination of the 2007 Plan remain outstanding in accordance with the plan's terms. Stock options generally have a term of eight years after the date of grant and vest after three years. 

We issue new shares of common stock for all of our stock plan vestings and exercises.

Performance Share Units (PSUs)

In February 2013, we issued approximately 0.1 million PSUs with a grant date fair value of $25.26, all of which were outstanding and nonvested at December 31, 2013. Vesting for the PSUs occurs at the end of a three-year period and is contingent upon our achievement of prospective company performance goals and our total shareholder return relative to a particular peer group during the three-year period. Forfeitable dividend equivalents on PSUs are accrued in the form of additional PSUs. The weighted average grant date fair value per share for PSU grants and dividends during 2013 was $25.26.

AtDecember 31, 2013, we had approximately $2.1 million of unrecognized compensation cost related to PSUs that will be recognized over a weighted average period of 2.0 years. The expense and unrecognized compensation cost assume the performance goals are attained at 100 percent. Actual performance, including modification for relative total shareholder return, may result in0 to 180 percentof the PSUs ultimately being earned. Compensation expense recognized for the PSUs is adjusted quarterly based on actual performance measure results.

We estimated the fair value on the date of initial grant for the PSUs using the Monte-Carlosimulation model. The following assumptions were used to value the grant:

• Expected volatility of 35 percent, based on our historical daily stock prices and those for components of our peer group.

• Expected life of 3.0 years, which equals the performance period.

• Expected dividend yield of 2.17 percent, assuming continuous reinvestment of the dividends, based on the plan's provisions.

• Risk free interest rate of 0.38 percent, based on the yield of U.S. Treasury bonds at the date of grant.

Restricted Stock Units (RSUs)

Activity for RSUs classified as equity is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	1,403		$	23.57
Granted	731		24.68
Vested	(790	)	23.12
Forfeited	(22	)	24.22
Outstanding at December 31, 2013	1,322		24.35

During 2013, 2012, and 2011, we issued RSUs with a weighted average grant date fair value per share of $24.68, $22.96, and $26.13, respectively.  RSUs vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period.  Forfeitable dividend equivalents on RSUs are accrued in the form of additional RSUs. Compensation cost for RSUs subject to accelerated vesting upon retirement is recognized over the implicit service period. 

The total fair value of shares vested during 2013, 2012, and 2011 was $18.3 million, $19.5 million, and $19.2 million, respectively. At December 31, 2013, we had $10.6 million of unrecognized compensation cost related to RSUs that will be recognized over a weighted average period of 0.8 years.

Cash-Settled Awards

Activity for cash-settled awards classified as a liability is as follows:

			Weighted Average
	Shares		Grant Date
	(000s)		Fair Value
Outstanding at December 31, 2012	207		$	23.72
Granted	60		24.22
Vested	(102	)	23.29
Outstanding at December 31, 2013	165		24.09

Cash-settled awards vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period.  Forfeitable dividend equivalents on cash-settled awards are accrued in the form of additional units.  Compensation cost for cash-settled awards subject to accelerated vesting upon retirement is recognized over the implicit service period.

The amount payable per unit awarded is equal to the price per share of Unum Group's common stock at settlement of the award, and as such, we measure the value of the award each reporting period based on the current stock price. The effects of changes in the stock price during the service period are recognized as compensation cost over the service period. Changes in the amount of the liability due to stock price changes after the service period are recognized as compensation cost during the period in which the changes occur.

The weighted average grant date fair value per unit for cash-settled awards granted during 2013, 2012, and 2011 was $24.22, $23.23, and $26.22, respectively.  The total fair value of cash-settled awards vested during 2013, 2012, and 2011 was $2.4 million, $1.5 million, and $0.7 million, respectively, and the total fair value of cash-settled awards paid during 2013, 2012, and 2011 was $2.5 million, $1.5 million, and $0.9 million, respectively. There is no unrecognized compensation cost related to the cash-settled awards, other than future changes in the liability due to future stock price changes, as the units do not require additional future service.

Stock Options

Stock option activity is summarized as follows:

					Remaining	Intrinsic
	Shares		Weighted Average		Contractual Term	Value
	(000s)		Exercise Price		(in years)	(in millions)
Outstanding at December 31, 2012	1,691		$	20.98
Granted	103		24.25
Exercised	(399	)	21.15
Outstanding at December 31, 2013	1,395		21.17		4.2	$	19.4
Exercisable at December 31, 2013	1,041		$	20.15	3.5	$	15.5

All outstanding stock options at December 31, 2013 are expected to vest. Stock options vest over a one- to three-year service period, beginning at the date of grant, and the compensation cost is recognized ratably during the vesting period. Compensation cost for stock options subject to accelerated vesting upon retirement is recognized over the implicit service period.

The total intrinsic value of options exercised during 2013, 2012, and 2011 was $4.4 million, $0.6 million, and $3.9 million, respectively. The total fair value of options that vested during 2013, 2012, and 2011 was $2.4 million, $2.3 million, and $2.7 million, respectively. At December 31, 2013, we had $0.6 million of unrecognized compensation cost related to stock options that will be recognized over a weighted average period of 0.7 years.

The weighted average grant date fair value of options granted during 2013, 2012, and 2011 was $9.77, $9.78, and $11.73, respectively. We estimated the fair value on the date of grant using the Black-Scholes valuation model. The following assumptions were used to value the 2013, 2012, and 2011 grants:

• Expected volatility of 52 percent, 52 percent, and 53 percent, respectively, based on our historical daily stock prices.

• Expected life of 6.0 years, 6.0 years, and 5.5 years, respectively, based on historical average years to exercise.

• Expected dividend yield of 2.14 percent, 1.80 percent, and 1.41 percent, respectively, based on the dividend rate at the date of grant.

• Risk free interest rate of 1.12 percent, 1.13 percent, and 2.37 percent, respectively, based on the yield of U.S. Treasury bonds at the date of grant.

Expense

Compensation expense for the stock plans, as reported in our consolidated statements of income, is as follows:

	Year Ended December 31
	2013		2012		2011
	(in millions of dollars)
Performance Share Units	$	1.1	$	—	$	—
Restricted Stock Units and Cash-Settled Awards	21.0		20.9		19.6
Stock Options	1.0		2.7		2.7
Other	0.5		0.6		1.2
Total Compensation Expense, Before Income Tax	$	23.6	$	24.2	$	23.5
Total Compensation Expense, Net of Income Tax	$	15.6	$	15.6	$	15.3

Cash received under all share-based payment arrangements for the years ended December 31, 2013, 2012, and 2011 was $11.4 million, $4.9 million, and $14.8 million, respectively.

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Employee Benefit Plans Measurement Assumptions (Details)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Discount Rate Pre-Remeasurement	4.50%	[1]
Discount Rate Post-Remesurement	5.00%	[1]
Assumptions Used Calculating Benefit Obligation, Discount Rate	5.30%		4.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.00%		4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			5.40%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%		7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.00%		4.00%
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Discount Rate Pre-Remeasurement	4.50%	[2]
Discount Rate Post-Remesurement	4.60%	[2]
Expected Return Pre-Remeasurement	6.20%	[2]
Expected Return Post-Remeasurement	6.35%	[2]
Assumptions Used Calculating Benefit Obligation, Discount Rate	4.40%		4.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.90%		3.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.90%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets			5.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.75%		3.85%
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	5.00%		4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	0.00%		0.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.20%		5.20%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.75%		5.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	0.00%		0.00%

[1] *In conjunction with the remeasurement due to the amendment of the plans, a discount rate of 4.50% was used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 5.00% was used for the period subsequent to the date of remeasurement through December 31, 2013.

[2] **In conjunction with the remeasurement due to the amendment of the plan, a discount rate of 4.50% and expected return on plan assets of 6.20% were used for the period January 1, 2013 through the date of remeasurement, and a discount rate of 4.60% and expected return on plan assets of 6.35% were used for the period subsequent to the date of remeasurement through December 31, 2013.