10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-Q

(Mark One)

x	Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the quarterly period ended September 30, 2013

o	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)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

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 (§232.405 of this chapter) 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 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

261,162,229 shares of the registrant's common stock were outstanding as of October 31, 2013.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited):
	Consolidated Balance Sheets at September 30, 2013 and December 31, 2012	2
	Consolidated Statements of Income for the three and nine months ended September 30, 2013 and 2012	4
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2013 and 2012	5
	Consolidated Statements of Stockholders' Equity for the nine months ended September 30, 2013 and 2012	6
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2013 and 2012	7
	Notes to Consolidated Financial Statements	8
	Review Report of Independent Registered Public Accounting Firm	49
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	50
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	87
Item 4.	Controls and Procedures	87
	PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	88
Item 1A.	Risk Factors	88
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	88
Item 6.	Exhibits	89
	Signatures	90

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 Quarterly Report on Form 10-Q (including certain statements in the consolidated financial statements and related notes and Management's Discussion and Analysis), 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 claims management operations, 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.

• Effects of business disruption or economic contraction due to disasters such as terrorist attacks, cyber attacks, other hostilities, or natural catastrophes, including any related impact on the value of our investment portfolio, our disaster recovery systems, cyber or other information security systems, and business continuity planning.

• 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 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.

• 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.

For further discussion of risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see Part 1, Item 1A of our annual report on Form 10-K for the year ended December 31, 2012.

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.

1

PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS

Unum Group and Subsidiaries

	September 30		December 31
	2013		2012
	(in millions of dollars)
	(Unaudited)
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $38,187.2; $37,751.5)	$	42,597.6	$	44,973.0
Mortgage Loans	1,776.1		1,712.7
Policy Loans	3,242.5		3,133.8
Other Long-term Investments	564.5		625.0
Short-term Investments	941.0		1,460.3
Total Investments	49,121.7		51,904.8
Other Assets
Cash and Bank Deposits	63.0		77.3
Accounts and Premiums Receivable	1,650.9		1,632.6
Reinsurance Recoverable	4,870.7		4,842.6
Accrued Investment Income	700.8		694.6
Deferred Acquisition Costs	1,804.9		1,755.5
Goodwill	201.7		201.7
Property and Equipment	508.8		501.6
Income Tax Receivable	31.1		—
Other Assets	632.2		625.4
Total Assets	$	59,585.8	$	62,236.1

See notes to consolidated financial statements.

2

CONSOLIDATED BALANCE SHEETS - Continued

Unum Group and Subsidiaries

	September 30			December 31
	2013			2012
	(in millions of dollars)
	(Unaudited)
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits	$	1,515.1		$	1,484.6
Reserves for Future Policy and Contract Benefits	42,836.8			44,694.4
Unearned Premiums	483.2			426.7
Other Policyholders’ Funds	1,636.0			1,644.9
Income Tax Payable	—			54.2
Deferred Income Tax	186.3			269.4
Short-term Debt	140.5			455.8
Long-term Debt	2,631.3			2,755.4
Other Liabilities	1,486.7			1,838.1
Total Liabilities	50,915.9			53,623.5
Commitments and Contingent Liabilities - Note 10
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 360,453,150 and 359,751,943 shares	36.0			36.0
Additional Paid-in Capital	2,623.8			2,607.7
Accumulated Other Comprehensive Income	409.6			628.0
Retained Earnings	7,899.7			7,371.6
Treasury Stock - at cost: 99,313,512 and 89,546,758 shares	(2,299.2		)	(2,030.7		)
Total Stockholders' Equity	8,669.9			8,612.6
Total Liabilities and Stockholders' Equity	$	59,585.8		$	62,236.1

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars, except share data)
Revenue
Premium Income	$	1,897.3		$	1,929.4		$	5,734.0		$	5,778.9
Net Investment Income	615.5			619.2			1,862.7			1,872.2
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	—			—			(0.8		)	—
Other Net Realized Investment Gain (Loss)	(26.1		)	21.3			(1.7		)	31.6
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Other Income	54.2			58.1			173.4			174.5
Total Revenue	2,540.9			2,628.0			7,767.6			7,857.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,641.6			1,686.9			4,951.9			5,033.0
Commissions	222.6			227.7			681.6			690.8
Interest and Debt Expense	37.4			36.6			111.8			107.3
Deferral of Acquisition Costs	(117.8		)	(111.0		)	(349.3		)	(347.6		)
Amortization of Deferred Acquisition Costs	98.6			87.0			323.7			285.6
Compensation Expense	196.2			187.0			588.7			589.3
Other Expenses	178.2			193.4			559.8			572.0
Total Benefits and Expenses	2,256.8			2,307.6			6,868.2			6,930.4
Income Before Income Tax	284.1			320.4			899.4			926.8
Income Tax (Benefit)
Current	69.4			85.5			263.4			126.4
Deferred	9.0			4.7			(0.9		)	139.9
Total Income Tax	78.4			90.2			262.5			266.3
Net Income	$	205.7		$	230.2		$	636.9		$	660.5
Net Income Per Common Share
Basic	$	0.78		$	0.83		$	2.39		$	2.33
Assuming Dilution	$	0.78		$	0.83		$	2.38		$	2.32

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Net Income	$	205.7		$	230.2		$	636.9		$	660.5
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(89.8); $301.7; $(983.8); $494.5)	(151.3		)	594.2			(1,854.9		)	961.0
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $169.8; $(213.5); $778.8; $(344.0))	283.1			(430.1		)	1,408.8			(683.6		)
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $5.2; $6.0; $1.9; $5.3)	(8.3		)	(10.3		)	(4.4		)	(8.4		)
Change in Foreign Currency Translation Adjustment	68.2			29.4			(0.8		)	39.0
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $0.5; $3.5; $124.9; $11.0)	1.2			6.6			232.9			20.5
Total Other Comprehensive Income (Loss)	192.9			189.8			(218.4		)	328.5
Comprehensive Income	$	398.6		$	420.0		$	418.5		$	989.0

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2013			2012
	(in millions of dollars)
Common Stock
Balance at Beginning of Year	$	36.0		$	35.9
Common Stock Activity	—			0.1
Balance at End of Period	36.0			36.0
Additional Paid-in Capital
Balance at Beginning of Year	2,607.7			2,591.1
Common Stock Activity	16.1			13.1
Balance at End of Period	2,623.8			2,604.2
Accumulated Other Comprehensive Income
Balance at Beginning of Year	628.0			461.8
Other Comprehensive Income (Loss)	(218.4		)	328.5
Balance at End of Period	409.6			790.3
Retained Earnings
Balance at Beginning of Year	7,371.6			6,611.0
Net Income	636.9			660.5
Dividends to Stockholders (per common share: $0.405; $0.340)	(108.8		)	(98.1		)
Balance at End of Period	7,899.7			7,173.4
Treasury Stock
Balance at Beginning of Year	(2,030.7		)	(1,530.1		)
Purchases of Treasury Stock	(268.5		)	(400.5		)
Balance at End of Period	(2,299.2		)	(1,930.6		)
Total Stockholders' Equity at End of Period	$	8,669.9		$	8,673.3

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2013			2012
	(in millions of dollars)
Cash Flows from Operating Activities
Net Income	$	636.9		$	660.5
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(225.7		)	9.0
Change in Deferred Acquisition Costs	(25.6		)	(62.0		)
Change in Insurance Reserves and Liabilities	465.5			333.8
Change in Income Taxes	(81.9		)	151.9
Change in Other Accrued Liabilities	12.5			(24.4		)
Non-cash Adjustments to Net Investment Income	(143.2		)	(160.7		)
Net Realized Investment (Gain) Loss	2.5			(31.6		)
Depreciation	63.4			63.5
Other, Net	5.1			13.8
Net Cash Provided by Operating Activities	709.5			953.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	877.0			401.2
Proceeds from Maturities of Fixed Maturity Securities	1,632.5			1,583.6
Proceeds from Sales and Maturities of Other Investments	166.5			112.6
Purchase of Fixed Maturity Securities	(2,808.5		)	(2,479.6		)
Purchase of Other Investments	(242.4		)	(219.4		)
Net Sales (Purchases) of Short-term Investments	522.7			(194.6		)
Other, Net	(77.0		)	(73.7		)
Net Cash Provided (Used) by Investing Activities	70.8			(869.9		)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(315.3		)	146.0
Issuance of Long-term Debt	—			246.4
Long-term Debt Repayments	(101.2		)	(45.6		)
Issuance of Common Stock	4.3			4.2
Repurchase of Common Stock	(272.4		)	(400.5		)
Dividends Paid to Stockholders	(108.8		)	(98.1		)
Other, Net	(1.2		)	0.7
Net Cash Used by Financing Activities	(794.6		)	(146.9		)
Net Decrease in Cash and Bank Deposits	(14.3		)	(63.0		)
Cash and Bank Deposits at Beginning of Year	77.3			116.6
Cash and Bank Deposits at End of Period	$	63.0		$	53.6

See notes to consolidated financial statements.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Unum Group and Subsidiaries

September 30, 2013

Note 1 - 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) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2012.

In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance.

Note 2 - Accounting Developments

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 these updates effective January 1, 2012. The adoption of these updates modified our financial statement presentation but had no effect on our financial position or results of operations.

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 2 - Accounting Developments - Continued

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.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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.

	September 30, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,597.6	$	42,597.6	$	44,973.0	$	44,973.0
Mortgage Loans	1,776.1		1,967.8		1,712.7		1,937.1
Policy Loans	3,242.5		3,312.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	24.5		24.5		81.6		81.6
Equity Securities	15.5		15.5		14.6		14.6
Miscellaneous Long-term Investments	465.4		465.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	634.2	$	634.2	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	554.2		554.2		535.5		535.5
Long-term Debt	2,631.3		2,827.5		2,755.4		2,968.8
Other Liabilities
Derivatives	142.9		142.9		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	65.4		65.4		83.9		83.9
Unfunded Commitments to Investment Partnerships	41.9		41.9		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 $3,014.3 million and $2,912.7 million as of September 30, 2013 and December 31, 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 valuations provided by the general partner in the partnerships' financial statements. 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.

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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 $2,163.9 million and $1,212.0 million as of September 30, 2013 and December 31, 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 $663.0 million and $1,756.8 million as of September 30, 2013 and December 31, 2012, respectively, and are assigned a Level 2. Debt instruments which are valued based on unobservable inputs that represent our assumptions about what a market participant would use in pricing the liability have a fair value of $0.6 million at September 30, 2013 and are assigned a Level 3. No debt instruments were valued using Level 3 inputs at December 31, 2012.

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

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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.

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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 September 30, 2013, approximately 10.3 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 89.7 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 73.0 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 3.7 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 13.0 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.

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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:

	September 30, 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	$	135.1	$	1,088.1	$	—	$	1,223.2
States, Municipalities, and Political Subdivisions	—		1,617.9		151.9		1,769.8
Foreign Governments	—		1,296.7		78.6		1,375.3
Public Utilities	692.0		9,572.9		291.8		10,556.7
Mortgage/Asset-Backed Securities	—		2,161.1		0.5		2,161.6
All Other Corporate Bonds	3,541.4		20,718.9		1,212.5		25,472.8
Redeemable Preferred Stocks	—		14.1		24.1		38.2
Total Fixed Maturity Securities	4,368.5		36,469.7		1,759.4		42,597.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		22.5		—		22.5
Foreign Exchange Contracts	—		2.0		—		2.0
Total Derivatives	—		24.5		—		24.5
Equity Securities	—		11.1		4.4		15.5
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.8	$	—	$	33.8
Foreign Exchange Contracts	—		107.6		—		107.6
Credit Default Swaps	—		1.5		—		1.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		65.4		65.4
Total Derivatives	—		142.9		65.4		208.3

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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

	Three Months Ended September 30
	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	$	21.7	$	164.6	$	426.8	$	60.5
States, Municipalities, and Political Subdivisions	—		31.8		43.0		62.9
Foreign Governments	—		—		21.7		—
Public Utilities	367.1		584.7		382.4		743.6
All Other Corporate Bonds	1,406.9		2,884.6		2,152.9		1,667.4
Total Fixed Maturity Securities	$	1,795.7	$	3,665.7	$	3,026.8	$	2,534.4
Equity Securities	$	—	$	—	$	—	$	7.4
	Nine Months Ended September 30
	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	$	48.0	$	—	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	—		53.1		41.9		74.8
Foreign Governments	—		—		20.7		—
Public Utilities	577.9		53.5		479.0		483.6
All Other Corporate Bonds	2,536.4		992.2		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,162.3	$	1,098.8	$	3,570.8	$	2,284.9

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.

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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:

	Three Months Ended September 30, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	152.0		$	—		$	(0.1	)	$	—	$	—		$	—	$	—		$	151.9
Foreign Governments	80.0			—			(1.4		)	—		—			—		—			78.6
Public Utilities	354.2			—			(5.2		)	—		—			144.1		(201.3		)	291.8
Mortgage/Asset-Backed Securities	14.9			(1.3		)	0.9			—		(14.0		)	—		—			0.5
All Other Corporate Bonds	1,042.5			(1.0		)	(2.5		)	7.0		(23.0		)	540.7		(351.2		)	1,212.5
Redeemable Preferred Stocks	24.2			—			(0.1		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,667.8			(2.3		)	(8.4		)	7.0		(37.0		)	684.8		(552.5		)	1,759.4
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(65.1		)	(0.3		)	—			—		—			—		—			(65.4		)
	Three Months Ended September 30, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - Fair Values of Financial Instruments - Continued

	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(8.4	)	$	—	$	(0.5	)	$	32.1	$	—		$	151.9
Foreign Governments	82.1			—			(3.5		)	—		—			—		—			78.6
Public Utilities	574.4			—			(19.4		)	—		(3.6		)	244.7		(504.3		)	291.8
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(70.5		)	30.1		(86.9		)	807.4		(646.5		)	1,212.5
Redeemable Preferred Stocks	24.8			—			(0.7		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,988.3			1.1			(102.4		)	30.1		(91.1		)	1,084.2		(1,150.8		)	1,759.4
Equity Securities	4.3			—			0.1			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	18.5			—			—		—			—		—			(65.4		)
	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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. Gains and losses 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 period end were $(0.3) million and $18.5 million for the three and nine months ended September 30, 2013, respectively, and $19.7 million and $28.7 million for the three and nine months ended September 30, 2012, 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:

	September 30, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	118.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	66.5			- Volatility of Credit	(e)	0.50% - 0.75% / 0.59%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.23% - 5.33% / 5.31%
All Other Corporate Bonds - Private	234.2			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	2.71% - 2.71% / 2.71% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.20% - 4.00% / 0.97% Priced at Par
All Other Corporate Bonds - Public	228.8			- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	(0.62)% - 1.00% / 0.27% 0.20% - 0.25% / 0.21% (0.84)% - 0.75% / (0.29)%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(65.4		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 3 - 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.

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments

Fixed Maturity Securities

At September 30, 2013 and December 31, 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.

	September 30, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.8	$	206.7	$	4.3	$	1,223.2
States, Municipalities, and Political Subdivisions	1,675.5		131.2		36.9		1,769.8
Foreign Governments	1,203.1		174.2		2.0		1,375.3
Public Utilities	9,372.1		1,233.7		49.1		10,556.7
Mortgage/Asset-Backed Securities	1,947.0		216.0		1.4		2,161.6
All Other Corporate Bonds	22,935.7		2,731.0		193.9		25,472.8
Redeemable Preferred Stocks	33.0		5.2		—		38.2
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	287.6	$	42,597.6

	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

As of September 30, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	September 30, 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	$	42.0	$	2.1	$	5.4	$	2.2
States, Municipalities, and Political Subdivisions	336.3		31.1		37.2		5.8
Foreign Governments	32.4		2.0		—		—
Public Utilities	764.4		42.5		43.1		6.6
Mortgage/Asset-Backed Securities	47.9		0.9		3.1		0.5
All Other Corporate Bonds	3,136.5		175.6		197.1		18.3
Total Fixed Maturity Securities	$	4,359.5	$	254.2	$	285.9	$	33.4

21

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - 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.

	September 30, 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	$	882.7	$	15.8	$	874.5	$	0.1	$	23.9
Over 1 year through 5 years	7,027.3		728.5		7,629.0		2.2		124.6
Over 5 years through 10 years	9,052.5		1,003.4		8,094.1		88.7		1,873.1
Over 10 years	19,277.7		2,734.3		19,244.0		195.2		2,572.8
	36,240.2		4,482.0		35,841.6		286.2		4,594.4
Mortgage/Asset-Backed Securities	1,947.0		216.0		2,110.6		1.4		51.0
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	37,952.2	$	287.6	$	4,645.4

	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 September 30, 2013, the fair value of investment-grade fixed maturity securities was $39,456.0 million, with a gross unrealized gain of $4,567.9 million and a gross unrealized loss of $221.1 million. The gross unrealized loss on investment-grade fixed maturity securities was 76.9 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.

22

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

At September 30, 2013, the fair value of below-investment-grade fixed maturity securities was $3,141.6 million, with a gross unrealized gain of $130.1 million and a gross unrealized loss of $66.5 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 23.1 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 September 30, 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 September 30, 2013, we held 207 individual investment-grade fixed maturity securities and 62 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 14 investment-grade fixed maturity securities and 10 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

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 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.

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

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. For those fixed maturity securities with an unrealized loss for which we have not recognized an other-than-temporary impairment, we believe we will recover the entire amortized cost, we do not intend to sell the security, and we do not believe it is more likely than not we will be required to sell the security before recovery of its amortized cost. There have been no defaults in the repayment obligations of any securities for which we have not recorded an other-than-temporary impairment.

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.  The determination of cash flows is inherently subjective, and methodologies may vary depending on the circumstances specific to the security. The timing and amount of our cash flow estimates are developed using historical and forecast financial information from the issuer, including its current and projected liquidity position. We also consider industry analyst reports and forecasts, sector credit ratings, future business prospects and earnings trends, issuer refinancing capabilities, actual and/or potential asset sales by the issuer, and other data relevant to the collectibility of the contractual cash flows of the security. We take into account the probability of default, expected recoveries, third party guarantees, quality of collateral, and where our debt security ranks in terms of subordination. We may use the estimated fair value of collateral as a proxy for the present value of cash flows if we believe the security is dependent on the liquidation of collateral for recovery of our investment.  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.

At September 30, 2013, we had non-binding commitments of $44.2 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 September 30, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $461.0 million, comprised of $315.0 million of tax credit partnerships and $146.0 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 $41.9 million at September 30, 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 $120.5 million to fund certain private equity partnerships at September 30, 2013, the amount of which may or may not be funded.

24

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

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 several partnership equity investments.  We contributed the bond and 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 partnerships 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.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond and partnerships were $135.6 million and $4.4 million, respectively, as of September 30, 2013.  The bonds are reported as fixed maturity securities, and the partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2013, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three and nine months ended September 30, 2013 and 2012.

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.

	September 30, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	70.4	4.0	%	$	47.2	2.7	%
Industrial	564.5		31.8		545.7		31.9
Office	732.4		41.2		721.2		42.1
Retail	408.8		23.0		398.6		23.3
Total	$	1,776.1	100.0	%	$	1,712.7	100.0	%

Region
New England	$	102.0	5.7	%	$	114.3	6.7	%
Mid-Atlantic	166.8		9.4		160.0		9.3
East North Central	241.0		13.6		224.7		13.1
West North Central	168.4		9.5		160.8		9.4
South Atlantic	433.9		24.4		440.9		25.7
East South Central	68.2		3.8		79.6		4.7
West South Central	202.4		11.4		159.5		9.3
Mountain	83.2		4.7		90.5		5.3
Pacific	310.2		17.5		282.4		16.5
Total	$	1,776.1	100.0	%	$	1,712.7	100.0	%

25

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

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:

	September 30 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	10.9	$	11.5
A	678.8		659.4
Baa	1,049.3		994.5
Ba	24.0		34.2
B	13.1		13.1
Total	$	1,776.1	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	771.8	$	624.7
> 65% <= 75%	816.0		858.8
> 75% <= 85%	121.9		142.5
> 85%	66.4		86.7
Total	$	1,776.1	$	1,712.7

Based on an analysis of the above risk factors, as well as other current information, 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. The projection of future cash flows and the determination of whether a borrower can make the contractual payments are inherently subjective, and methodologies may vary depending on the circumstances specific to a 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. 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.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

The activity in the allowance for credit losses is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5	$	1.5
Provision	—		1.3		—		1.8
Charge-offs, Net of Recoveries	—		—		—		(0.5		)
Balance at End of Period	$	1.5	$	2.8	$	1.5	$	2.8

Impaired mortgage loans are as follows:

	September 30, 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 $13.1 million and $15.5 million for the three and nine months ended September 30, 2013, respectively, and $15.9 million and $18.8 million for the three and nine months ended September 30, 2012, respectively. Interest income recognized on mortgage loans subsequent to impairment was $0.2 million and $0.6 million for the three and nine months ended September 30, 2013 and 2012, respectively.

There were no troubled debt restructurings during the three months ended September 30, 2013 and 2012. Our troubled debt restructurings during the nine months ended September 30, 2013 and 2012 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2013		2012
	(in millions of dollars)
Carrying Amount	$	4.3	$	13.1
Number of Loans	1		2

We had no realized losses on loan foreclosures for the three and nine months ended September 30, 2013 and 2012, other than the initial impairment losses recognized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At September 30, 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 the second quarter of 2013.

At September 30, 2013, we had non-binding commitments of $61.6 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

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 September 30, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $254.4 million, for which we received collateral in the form of cash and securities of $140.5 million and $124.1 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 September 30, 2013 or December 31, 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 5 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.

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

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.

	September 30, 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	$	24.5	$	—	$	24.5	$	(22.8	)	$	(1.3	)	$	0.4
Securities Lending	254.4		—		254.4		(113.9		)	(140.5		)	—
Total	$	278.9	$	—	$	278.9	$	(136.7	)	$	(141.8	)	$	0.4
Financial Liabilities:
Derivatives	$	142.9	$	—	$	142.9	$	(112.3	)	$	—		$	30.6
Securities Lending	140.5		—		140.5		(140.5		)	—			—
Total	$	283.4	$	—	$	283.4	$	(252.8	)	$	—		$	30.6

	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

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 4 - Investments - Continued

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	584.2	$	589.0	$	1,771.3	$	1,790.8
Derivative Financial Instruments	8.9		9.1		25.6		22.0
Mortgage Loans	28.5		25.5		81.6		76.5
Policy Loans	4.0		3.7		11.6		10.8
Other Long-term Investments	4.0		5.4		14.5		13.2
Short-term Investments	0.5		1.0		1.9		3.3
Gross Investment Income	630.1		633.7		1,906.5		1,916.6
Less Investment Expenses	7.2		6.3		21.1		20.3
Less Investment Income on Participation Fund Account Assets	3.9		4.1		11.8		12.1
Less Amortization of Tax Credit Partnerships	3.5		4.1		10.9		12.0
Net Investment Income	$	615.5	$	619.2	$	1,862.7	$	1,872.2

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.3		$	4.6		$	13.5		$	14.0
Gross Losses on Sales	(33.0		)	(2.3		)	(40.1		)	(9.0		)
Other-Than-Temporary Impairment Loss	—			—			(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	5.6			2.3			14.6			2.3
Impairment Loss	(1.0		)	(1.3		)	(2.0		)	(1.8		)
Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7			18.5			28.7
Other Derivatives	(1.0		)	—			(1.5		)	—
Foreign Currency Transactions	(0.7		)	(1.7		)	(4.7		)	(2.6		)
Net Realized Investment Gain (Loss)	$	(26.1	)	$	21.3		$	(2.5	)	$	31.6

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - 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.

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 interest payments and debt repayments 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 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 debt 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.

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - 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 less collateral held, was $0.4 million at September 30, 2013. We held $1.3 million cash collateral from our counterparties at September 30, 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 $91.5 million and $108.6 million at September 30, 2013 and December 31, 2012, respectively. We had no cash posted as collateral to our counterparties at September 30, 2013. We had $1.8 million cash posted as collateral to our counterparties at December 31, 2012.

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 $142.9 million and $170.5 million at September 30, 2013 and December 31, 2012, respectively.

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - Derivative Financial Instruments - Continued

Derivative Transactions

The table below summarizes, by notional amounts, the activity for each category of derivatives.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	—	$	—	$	1,309.5
Additions	—		—		250.0		—		25.0		—		275.0
Terminations	—		26.3		45.0		—		—		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	—	$	—	$	1,413.0
Additions	—		—		250.0		—		81.0		—		331.0
Terminations	—		39.8		135.0		—		56.0		—		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at June 30, 2013	$	174.0	$	474.7	$	675.0	$	70.0	$	—	$	10.0	$	1,403.7
Additions	—		10.0		—		—		—		—		10.0
Terminations	24.0		3.6		40.0		—		—		10.0		77.6
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	—	$	1,432.8
Additions	—		10.0		—		70.0		24.0		10.0		114.0
Terminations	24.0		37.7		115.0		—		24.0		10.0		210.7
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	35.0
Weighted Average Receive Rate	6.82		%
Weighted Average Pay Rate	0.25		%

Cash Flow Hedges

As of September 30, 2013 and December 31, 2012, we had $35.0 million and $150.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $481.1 million and $508.8 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

For the three and nine months ended September 30, 2013 and 2012, 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.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - Derivative Financial Instruments - Continued

As of September 30, 2013, we expect to amortize approximately $45.7 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. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2013. Fluctuations in fair values of these derivatives between September 30, 2013 and the date of termination will vary our projected amortization. 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 September 30, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2013 and December 31, 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. Changes in the fair value of the derivative 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 change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a loss of $2.9 million and $9.7 million for the three and nine months ended September 30, 2013, respectively, and a gain of $0.2 million and $0.4 million for the three and nine months ended September 30, 2012, respectively, with an offsetting gain or loss on the related interest rate swaps.

As of September 30, 2013 and December 31, 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 $(1.8) million and $17.3 million for the three and nine months ended September 30, 2013, respectively, and a loss of $4.1 million and $8.3 million for the three and nine months ended September 30, 2012, respectively, with an offsetting gain or loss on the related interest rate swaps.

For the three and nine months ended September 30, 2013 and 2012, 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 September 30, 2013, we held $70.0 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. Changes in the fair value of the derivative, together with the payment of periodic fees, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. 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. Changes in the fair value of the embedded derivative are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - Derivative Financial Instruments - Continued

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.

	September 30, 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	$	22.5	Other Liabilities	$	33.8
Foreign Exchange Contracts	Other L-T Investments	2.0		Other Liabilities	107.6
Total		$	24.5		$	141.4
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.5
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	65.4
Total					$	66.9

	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

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 5 - Derivative Financial Instruments - Continued

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.

		Three Months Ended September 30						Nine Months Ended September 30
		2013			2012			2013			2012
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	—		$	20.2		$	(7.1	)	$	55.1
Options		—			—			(0.1		)	—
Foreign Exchange Contracts		(8.4		)	(14.7		)	14.3			(4.9		)
	Total	$	(8.4	)	$	5.5		$	7.1		$	50.2
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	11.1		$	11.7		$	32.2		$	30.4
	Foreign Exchange Contracts	(1.4		)	(0.1		)	(4.6		)	(0.9		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	(0.1		)	0.1			0.7			2.2
	Foreign Exchange Contracts	(1.3		)	(16.7		)	(13.7		)	(18.6		)
Interest and Debt Expense
	Interest Rate Swaps	(0.4		)	(0.5		)	(1.2		)	(1.3		)
	Total	$	7.9		$	(5.5	)	$	13.4		$	11.8

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.

		Three Months Ended September 30					Nine Months Ended September 30
		2013			2012		2013			2012
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.0	)	$	—	$	(1.5	)	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7		18.5			28.7
	Total	$	(1.3	)	$	19.7	$	17.0		$	28.7

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 6 - 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 June 30, 2013		$	295.6		$	405.5		$	(141.6	)	$	(342.8	)	$	216.7
	Other Comprehensive Income (Loss) Before Reclassifications	113.9			(3.2		)	68.2			2.9			181.8
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	17.9			(5.1		)	—			(1.7		)	11.1
	Net Other Comprehensive Income (Loss)	131.8			(8.3		)	68.2			1.2			192.9
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(452.5		)	4.3			(0.8		)	217.7			(231.3		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	6.4			(8.7		)	—			15.2			12.9
	Net Other Comprehensive Income (Loss)	(446.1		)	(4.4		)	(0.8		)	232.9			(218.4		)
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6

The net unrealized gain on securities consists of the following components:

										Change at September 30, 2013
	September 30			June 30			December 31			Three Months			Nine Months
	2013			2013			2012			Ended			Ended
	(in millions of dollars)
Fixed Maturity Securities	$	4,410.4		$	4,659.6		$	7,221.5		$	(249.2	)	$	(2,811.1	)
Other Investments	65.2			57.1			92.8			8.1			(27.6		)
Deferred Acquisition Costs	(42.8		)	(43.8		)	(67.0		)	1.0			24.2
Reserves for Future Policy and Contract Benefits	(4,037.6		)	(4,498.1		)	(6,277.5		)	460.5			2,239.9
Reinsurance Recoverable	275.0			283.6			351.5			(8.6		)	(76.5		)
Deferred Income Tax	(242.8		)	(162.8		)	(447.8		)	(80.0		)	205.0
Total	$	427.4		$	295.6		$	873.5		$	131.8		$	(446.1	)

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 6 - Accumulated Other Comprehensive Income - Continued

Amounts reclassified from accumulated other comprehensive income were recognized in our consolidated statements of income as follows:

			September 30, 2013
			Three Months			Nine Months
			Ended			Ended
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(27.5	)	$	(9.1	)
		Other-Than-Temporary Impairment Loss	—			(0.8		)
			(27.5		)	(9.9		)
	Income Tax Benefit		(9.6		)	(3.5		)
	Total		$	(17.9	)	$	(6.4	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	11.1		$	32.2
		Loss on Foreign Exchange Contracts	(1.4		)	(4.6		)
	Net Realized Investment Gain (Loss)
		Gain (Loss) on Interest Rate Swaps	(0.1		)	0.7
		Loss on Foreign Exchange Contracts	(1.3		)	(13.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)	(1.2		)
			7.9			13.4
	Income Tax Expense		2.8			4.7
	Total		$	5.1		$	8.7
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(2.7	)	$	(30.5	)
		Amortization of Prior Service Credit	1.1			3.6
		Curtailment Gain	3.7			3.0
			2.1			(23.9		)
	Income Tax Expense (Benefit)		0.4			(8.7		)
	Total		$	1.7		$	(15.2	)

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 7 - Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate.

Premium income by major line of business within each of our segments is presented as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	385.0	$	392.4	$	1,172.5	$	1,185.7
Group Short-term Disability	129.5		120.1		389.6		356.0
Group Life and Accidental Death & Dismemberment
Group Life	305.2		297.3		911.0		885.1
Accidental Death & Dismemberment	30.5		29.2		91.6		86.2
Supplemental and Voluntary
Individual Disability - Recently Issued	114.9		119.9		349.3		357.0
Voluntary Benefits	159.5		153.0		481.8		468.9
	1,124.6		1,111.9		3,395.8		3,338.9
Unum UK
Group Long-term Disability	96.5		102.9		290.7		306.5
Group Life	25.6		56.4		83.1		164.6
Supplemental and Voluntary	15.2		15.9		44.9		48.0
	137.3		175.2		418.7		519.1
Colonial Life
Accident, Sickness, and Disability	185.0		181.8		554.5		541.8
Life	55.6		52.2		165.7		156.3
Cancer and Critical Illness	68.5		65.4		203.9		194.5
	309.1		299.4		924.1		892.6
Closed Block
Individual Disability	169.3		183.1		521.7		554.9
Long-term Care	157.0		159.4		473.6		471.5
All Other	—		0.4		0.1		1.9
	326.3		342.9		995.4		1,028.3
Total	$	1,897.3	$	1,929.4	$	5,734.0	$	5,778.9

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 7 - 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)
Three Months Ended September 30, 2013
Premium Income	$	1,124.6	$	137.3	$	309.1	$	326.3	$	—		$	1,897.3
Net Investment Income	233.1		30.3		36.3		315.4		0.4			615.5
Other Income	30.2		0.1		—		23.6		0.3			54.2
Operating Revenue	$	1,387.9	$	167.7	$	345.4	$	665.3	$	0.7		$	2,567.0
Operating Income (Loss)	$	219.8	$	31.3	$	69.0	$	25.7	$	(32.9	)	$	312.9
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Nine Months Ended September 30, 2013
Premium Income	$	3,395.8	$	418.7	$	924.1	$	995.4	$	—		$	5,734.0
Net Investment Income	699.9		106.5		110.3		944.6		1.4			1,862.7
Other Income	99.0		0.1		0.1		71.5		2.7			173.4
Operating Revenue	$	4,194.7	$	525.3	$	1,034.5	$	2,011.5	$	4.1		$	7,770.1
Operating Income (Loss)	$	641.9	$	96.1	$	215.5	$	82.6	$	(103.7	)	$	932.4
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 7 - Segment Information - Continued

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income is presented as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,567.0		$	2,606.7		$	7,770.1		$	7,825.6
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Total Revenue	$	2,540.9		$	2,628.0		$	7,767.6		$	7,857.2
Operating Income by Segment	$	312.9		$	310.7		$	932.4		$	930.0
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Non-operating Retirement-related Loss	(2.7		)	(11.6		)	(30.5		)	(34.8		)
Income Tax	(78.4		)	(90.2		)	(262.5		)	(266.3		)
Net Income	$	205.7		$	230.2		$	636.9		$	660.5

Assets by segment are as follows:

	September 30		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,569.7	$	19,391.2
Unum UK	3,690.1		3,975.8
Colonial Life	3,435.4		3,434.9
Closed Block	31,651.2		33,069.2
Corporate	2,239.4		2,365.0
Total	$	59,585.8	$	62,236.1

Note 8 - Employee Benefit Plans

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.K. defined benefit pension plan was closed to new entrants on December 31, 2002.

U.S. Plans

In June 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 the second quarter of 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 during the second quarter of 2013, 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.

41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 8 - Employee Benefit Plans - Continued

As a result of these plan amendments, during the second quarter of 2013 we recognized a $0.7 million curtailment loss, 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.

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013;however, we elected to make a voluntary contribution of $50.0 million to this plan during the second quarter of 2013.

U.K. Plan

In September 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 the third quarter of 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.

As a result of these plan amendments, during the third quarter of 2013, we recognized a curtailment gain of $3.7 million, or £2.3 million, 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.

We made required contributions to our U.K. plan of $0.9 million and $2.8 million, or approximately £0.6 million and £1.8 million, during the three and nine months ended September 30, 2013, respectively. Effective October 1, 2013, we will increase contributions to the U.K. plan from 24.8 percent to 30.0 percent of pensionable earnings for plan participants. Subsequent to June 30, 2014, we will no longer be subject to required contributions, but we may make voluntary contributions in the future as is deemed necessary. Contributions to the U.K. plan are sufficient to meet the minimum funding requirements under U.K. law.

Amortization of Actuarial Gain or Loss

In addition, 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, which is approximately 30 years for U.S. participants and 35 years for U.K. participants. The net actuarial loss was previously amortized over the average future working life of pension plan participants, or approximately 11 years.

Net Periodic Benefit Cost (Credit)

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 benefit cost during 2013 is approximately $28.1 million before tax and $18.5 million after tax.

42

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 8 - Employee Benefit Plans - Continued

The components of net periodic benefit cost (credit) related to the Company's defined benefit pension and OPEB plans are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.8		$	12.2		$	1.0		$	1.2		$	0.2		$	0.4
Interest Cost	21.3			21.1			2.1			2.2			2.0			2.3
Expected Return on Plan Assets	(27.2		)	(22.2		)	(3.1		)	(2.8		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	2.3			11.5			0.4			0.1			—			—
Prior Service Cost (Credit)	0.1			(0.1		)	—			—			(1.2		)	(0.6		)
Curtailment Gain	—			—			(3.7		)	—			—			—
Total	$	11.3		$	22.5		$	(3.3	)	$	0.7		$	0.8		$	1.9

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	44.6		$	36.6		$	3.2		$	3.6		$	0.6		$	1.2
Interest Cost	65.0			63.3			6.3			6.4			6.0			7.1
Expected Return on Plan Assets	(78.5		)	(66.5		)	(9.1		)	(8.3		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	29.4			34.4			1.1			0.4			—			—
Prior Service Cost (Credit)	0.1			(0.4		)	—			—			(3.7		)	(1.9		)
Curtailment Loss (Gain)	0.7			—			(3.7		)	—			—			—
Total	$	61.3		$	67.4		$	(2.2	)	$	2.1		$	2.4		$	5.9

Defined Contribution Plans

We offer a 401(k) plan to all eligible U.S. employees under which a portion of employee contributions is matched. Currently, we match 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. 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 will also include any performance-based incentive compensation as part of the definition of earnings for purposes of contributions. Also effective January 1, 2014, we will 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. In addition, a separate transition contribution will be made for eligible employees who meet certain age and years of service criteria. The 401(k) plan will continue to qualify for a “safe harbor” from annual discrimination testing.  These changes are in compliance with Employee Retirement Income Security Act (ERISA) guidelines.

We also offer a defined contribution plan to all eligible U.K. employees under which a portion of employee contributions is matched. Currently, we match pound-for-pound up to 5.0 percent of base salary for employee contributions into the defined contribution plan and make an additional non-elective contribution of 5.0 percent of base salary. 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. Also effective July 1, 2014, we will increase the non-elective contribution to 6.0 percent of base salary for all eligible employees. In addition, a separate transition contribution will be made for all eligible employees through March 31, 2016.

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 9 - Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.7	$	230.2	$	636.9	$	660.5
Denominator (000s)
Weighted Average Common Shares - Basic	262,945.9		278,354.4		265,932.6		284,012.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,314.1		156.6		1,161.1		478.4
Weighted Average Common Shares - Assuming Dilution	264,260.0		278,511.0		267,093.7		284,491.2
Net Income Per Common Share
Basic	$	0.78	$	0.83	$	2.39	$	2.33
Assuming Dilution	$	0.78	$	0.83	$	2.38	$	2.32

We use the treasury stock method to account for the effect of outstanding stock options, nonvested stock awards, and performance restricted stock units on the computation of dilutive 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 stock awards and the performance restricted stock units.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $19.38 to $32.35, and the performance restricted stock units have a grant price of $23.97.

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 current market prices, approximated 0.1 million shares of common stock for the nine month period ended September 30, 2013, and 2.8 million and 2.4 million shares of common stock for the three and nine month periods ended September 30, 2012, respectively. There were no potential common shares that were antidilutive for the three month period ended September 30, 2013.

In July 2012 and February 2011, our board of directors authorized the repurchase of up to $750.0 million and $1.0 billion, respectively, of Unum Group's common stock. At December 31, 2012, no amounts remained for the purchase of shares under the February 2011 repurchase program. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $281.6 million at September 30, 2013.

44

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 9 - Stockholders' Equity and Earnings Per Common Share - Continued

Common stock repurchases, which are classified as treasury stock and accounted for using the cost method, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions)
Shares Repurchased	2.5		5.1		9.8		18.6
Cost of Shares Repurchased (1)	$	75.0	$	100.2	$	268.5	$	400.5

(1) Includes commissions of $0.1 million for the nine month period ended September 30, 2013 and $0.1 million and $0.4 million for the three and nine month periods ended September 30, 2012, respectively.

For the year ended December 31, 2012, we repurchased 23.6 million shares at a cost of $500.6 million, including commissions of $0.6 million.

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.

Note 10 - Commitments and Contingent Liabilities

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.

45

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 10 - 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.

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 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 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 the court’s 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.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 33 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination.

In July 2011, the New York State Department of Financial Services issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate.

It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York State Department of Financial Services' letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

46

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 10 - 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 allege 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 seek to examine company records and assess penalties and costs in an undetermined amount. In April 2013, we filed motions to dismiss both complaints. The motions were heard in September 2013, and we are awaiting a ruling from the court.

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.

47

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2013

Note 11 - Other

Debt

At September 30, 2013, short-term debt consisted entirely of securities lending agreements.

During the nine months ended September 30, 2013, we made principal payments of $45.0 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC.

In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured non-recourse notes issued by Tailwind Holdings, LLC, resulting in a before-tax gain of $4.0 million.

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. 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. At September 30, 2013, no amount was outstanding on the facility.

Income Tax

At September 30, 2013, we had a liability of $21.5 million for unrecognized tax benefits, $15.0 million of which is associated with deferred tax assets. The interest and penalties expense (benefit) related to unrecognized tax benefits in our consolidated statements of income was $0.1 million and $0.3 million for the three and nine months ended September 30, 2013, respectively, and less than $0.1 million and $(10.5) million for the three and nine months ended September 30, 2012, respectively.

During the third quarter of 2013, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from the current rate of 23 percent to 21 percent effective April 2014 and to 20 percent effective April 2015. During the third quarter of 2012, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 25 percent to 24 percent effective April 2012 and to 23 percent effective April 2013.  Deferred tax assets and liabilities are adjusted through income on the date of enactment of a rate change. We recorded a reduction of $6.3 million and $9.3 million in our income tax expense in the third quarter of 2013 and 2012, respectively.

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Review Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders

Unum Group and Subsidiaries

We have reviewed the consolidated balance sheet of Unum Group and subsidiaries as of September 30, 2013, and the related consolidated statements of income and comprehensive income (loss) for the three and nine-month periods ended September 30, 2013 and 2012, and the consolidated statements of stockholders' equity and cash flows for the nine-month periods ended September 30, 2013 and 2012. These financial statements are the responsibility of the Company's management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters.  It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole.  Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Unum Group and subsidiaries as of December 31, 2012, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for the year then ended not presented herein and we expressed an unqualified audit opinion on those consolidated financial statements and included an explanatory paragraph for the adoption of amendments to the FASB Accounting Standards Codification resulting from Accounting Standards Update No. 2010-26, "Insurance (Topic 944): Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts," in our report dated February 22, 2013.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 5, 2013

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Introduction

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively 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 major business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Closed Block and the Corporate segments. These segments are discussed more fully under "Segments Results" contained in this Item 2.

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 value 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 are an industry leader, and we believe we are well positioned in our sector with solid long-term growth prospects. Given the nature of our business, however, we are sensitive to economic and financial market movements, including interest rates, consumer confidence, and employment levels. Our business outlook, which recognizes both the challenges of the current economic environment as well as the mitigating impact of risk-reducing actions we have taken in recent years, is consistent with our risk appetite. Although the occurrence of one or more of the risk factors discussed in our 2012 annual report on Form 10-K may cause our results to differ materially from our outlook, our business plan has been tested against a variety of economic scenarios, and we believe we can continue to meet the challenges presented by the current economic environment. We remain cautious of the near-term outlook for employment levels and wages, both of which limit opportunities for premium growth, but we believe we are poised to profitably grow as employment trends improve.

This discussion and analysis should be read in conjunction with the consolidated financial statements and notes thereto in Part I, Item 1 contained in this Form 10-Q and with the "Cautionary Statement Regarding Forward-Looking Statements" included below the Table of Contents, as well as the discussion, analysis, and consolidated financial statements and notes thereto in Part I, Items 1 and 1A, and Part II, Items 6, 7, 7A, and 8 of our annual report on Form 10-K for the year ended December 31, 2012.

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Executive Summary

We remain focused on profitable top line growth in select markets, and we intend to continue our disciplined investment strategy, drive effectiveness in our operating performance, and generate consistent, sustainable capital available for deployment. We believe that our strategy of delivering a broad set of financial protection choices to employees while also enabling employers to define their financial contribution in support of those choices should enable us to continue as a market leader over the long term. However, in the short term we are maintaining a cautious view of the business environment given the continuing challenge of low interest rates, the weak pace of economic growth, political instability, and the distraction from healthcare reform.

A discussion of our operating performance and capital management follows.

Operating Performance and Capital Management

For the third quarter of 2013, we reported net income of $205.7 million, or $0.78 per diluted common share, compared to net income of $230.2 million, or $0.83 per diluted common share, in the same period of 2012. For the first nine months of 2013, net income was $636.9 million, or $2.38 per diluted common share, compared to net income of $660.5 million, or $2.32 per diluted common share, in the same period of 2012. After-tax operating income, which excludes realized investment gains or losses and non-operating retirement-related gains or losses, was $224.6 million, or $0.85 per diluted common share, in the third quarter of 2013, compared to $224.0 million, or $0.80 per diluted common share, in the same period of 2012. After-tax operating income was $658.7 million, or $2.47 per diluted common share, in the first nine months of 2013 compared to $662.5 million, or $2.33 per diluted common share, in the same period of 2012.

Total operating revenue by segment was marginally lower in the third quarter and first nine months of 2013 relative to the same periods of 2012, with slight year-over-year declines in both premium income and net investment income. Total operating income by segment for the third quarter and first nine months of 2013 showed slight improvement relative to the comparable periods of 2012, with favorable or consistent 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 share repurchases.

Our Unum US segment reported increases in segment operating income of 1.6 percent and 1.1 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012, with growth in premium income and favorable risk results. Although Unum US premium income increased 1.1 percent and 1.7 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012, the slow economic recovery, low levels of employment growth, and the competitive environment continue to pressure our premium income growth, including growth which normally occurs due to increases in salaries and the number of employees covered under existing policies. The benefit ratios for our Unum US segment for the third quarter and first nine months of 2013 were 72.0 percent and 71.6 percent, respectively, compared to 73.0 percent and 72.5 percent in the same periods of 2012, driven by favorable risk results in our group product lines. Unum US sales decreased 0.8 percent and 6.0 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012. Premium persistency declined relative to the first nine months of 2012, although case persistency for our group products other than short-term disability was favorable compared to the same period last year.

Our Unum UK segment reported increases in segment operating income, as measured in Unum UK's local currency, of 16.2 percent and 1.6 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012, with overall favorable risk results. Premium income in local currency declined 20.2 percent and 17.6 percent in the third quarter and first nine months of 2013, respectively, relative to the same periods of 2012 due primarily to reinsurance agreements entered into effective January 1, 2013 to cede a portion of our group life business. The reinsurance agreements will continue to significantly decrease premium income and benefit payments for group life relative to 2012 and are expected to continue to reduce volatility in this line of business. The benefit ratios for Unum UK were 70.6 percent and 74.7 percent, in the third quarter and first nine months of 2013, respectively, compared to 77.7 percent and 78.5 percent, in the same periods of 2012, due to improved risk results in the group life product line. Unum UK sales in the third quarter of 2013 were generally consistent with the comparable prior year period but decreased 21.5 percent, in local currency, in the first nine months of 2013 compared to the same period of 2012 due primarily to lower group life sales as we continue to execute our plans to improve new business pricing and reposition our group life business for better margins and greater stability. Premium persistency declined, as expected, primarily as a result of pursuing rate increases on renewing business.

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Our Colonial Life segment reported increases in segment operating income of 0.4 percent and 4.6 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012, with higher operating revenue and stable risk results. Premium income grew 3.2 percent and 3.5 percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012. Overall risk results for Colonial Life were generally consistent in the third quarter and first nine months of 2013 compared with the same periods of 2012. Colonial Life sales decreased 2.9 percent and 3.2 percent, in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012, with decreases in the core commercial market segment partially offset by higher large case commercial market sales. Persistency continues to be strong for all lines of business.

Our Closed Block segment reported increases in segment operating income of 0.4 percent and 23.8 percent in the third quarter and first nine months of 2013, respectively, relative to the same periods of 2012, with favorable net investment income and risk results.

Our investment portfolio continues to perform well and our asset quality remains strong. The net unrealized gain on our fixed maturity securities was $4.4 billion at September 30, 2013 compared to $7.2 billion at December 31, 2012, with the decline due primarily to an increase in U.S. Treasury rates during the first nine months of 2013.

We believe our capital and financial positions are strong. At September 30, 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 397 percent, slightly higher than the level at December 31, 2012. During the third quarter and first nine months of 2013, we repurchased 2.5 million and 9.8 million shares of Unum Group common stock at a cost of $75.0 million and $268.5 million, respectively, 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 $678 million at September 30, 2013, relative to $805 million at December 31, 2012, with the decline due primarily to repurchases of our common stock, debt repayments, and contributions to our defined benefit pension plans.

Retirement Benefit Changes

In June and September 2013, we adopted plan amendments which freeze participation and benefit accruals in our defined benefit pension plans in the U.S. and U.K., respectively, 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 $3.7 million and $3.0 million in the third quarter and first nine months of 2013, respectively. 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 as of September 30, 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 2 and in the "Notes to Consolidated Financial Statements" contained herein in Item 1.

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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. There have been no significant changes in our critical accounting estimates during the first nine months of 2013, other than those resulting from amendments to our employee benefit plans, as discussed in Note 8 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

For additional information, refer to our significant accounting policies in Note 1 of the "Notes to Consolidated Financial Statements" in Part II, Item 8 and "Critical Accounting Estimates" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012.

Accounting Developments

In April 2013, the Financial Accounting Standards Board (FASB) issued a proposed Accounting Standards Update (ASU) that would modify the accounting for certain tax credit investments. This proposal, which has not yet been finalized, would modify the method of amortization of the investment and would allow entities to present the amortization and the tax credits together within the income tax line item rather than separate reporting of the investment performance and the tax credits. As currently drafted, the proposal would be applied retrospectively and would be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. We have not yet quantified the impact on our financial position or results of operations.

In July 2013, the FASB issued a proposed 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 does not specify an effective date, but instead requests feedback on the appropriate timing.

See Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for additional information on new accounting standards and the impact, if any, on our financial position or results of operations.

53

Consolidated Operating Results

(in millions of dollars)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Revenue
Premium Income	$	1,897.3		(1.7	)%	$	1,929.4		$	5,734.0		(0.8	)%	$	5,778.9
Net Investment Income	615.5			(0.6	)	619.2			1,862.7			(0.5	)	1,872.2
Net Realized Investment Gain (Loss)	(26.1		)	N.M.		21.3			(2.5		)	(107.9	)	31.6
Other Income	54.2			(6.7	)	58.1			173.4			(0.6	)	174.5
Total Revenue	2,540.9			(3.3	)	2,628.0			7,767.6			(1.1	)	7,857.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,641.6			(2.7	)	1,686.9			4,951.9			(1.6	)	5,033.0
Commissions	222.6			(2.2	)	227.7			681.6			(1.3	)	690.8
Interest and Debt Expense	37.4			2.2		36.6			111.8			4.2		107.3
Deferral of Acquisition Costs	(117.8		)	6.1		(111.0		)	(349.3		)	0.5		(347.6		)
Amortization of Deferred Acquisition Costs	98.6			13.3		87.0			323.7			13.3		285.6
Compensation Expense	196.2			4.9		187.0			588.7			(0.1	)	589.3
Other Expenses	178.2			(7.9	)	193.4			559.8			(2.1	)	572.0
Total Benefits and Expenses	2,256.8			(2.2	)	2,307.6			6,868.2			(0.9	)	6,930.4
Income Before Income Tax	284.1			(11.3	)	320.4			899.4			(3.0	)	926.8
Income Tax	78.4			(13.1	)	90.2			262.5			(1.4	)	266.3
Net Income	$	205.7		(10.6	)	$	230.2		$	636.9		(3.6	)	$	660.5

N.M. = not a meaningful percentage

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 as occurred during the third quarter and first nine months of 2013, translating pounds into dollars decreases current period results relative to the prior periods. 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 1.557 and 1.590 for the three months ended September 30, 2013 and 2012, respectively, and 1.548 and 1.576 for the nine months ended September 30, 2013 and 2012, respectively. If the 2012 results for our U.K. operations had been translated at the lower exchange rates of the third quarter and first nine months of 2013, our operating revenue and operating income by segment would have been lower by approximately $3.2 million and $0.5 million, respectively, in the third quarter of 2012 and approximately $12.5 million and $1.6 million, respectively, in the first nine months of 2012. 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 the third quarter and first nine months of 2013 declined slightly relative to the same periods of 2012. Although we experienced premium growth in our Unum US and Colonial Life segments, the level of growth remains below our long-term expectations, as we continue to experience pressure on premium growth in many of our product lines due to the slow economic recovery, low levels of employment growth, and the competitive environment. Offsetting the overall growth in premium income in Unum US and Colonial Life is 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. Premium income also continues to decline, as expected, in our Closed Block segment. 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 the third quarter and first nine months of 2013 relative to the same periods of 2012 due primarily to a decrease in the yield on invested assets, partially offset by a higher level of invested assets. Net investment income from bond calls and private equity partnership investments increased slightly in the third quarter and first nine months of 2013 relative to the same periods of 2012, but on an operating segment level investment income from those sources exhibited more year-over-year volatility.

We recognized a net realized investment loss of $26.1 million and a gain of $21.3 million in the third quarter of 2013 and 2012, respectively, and a loss of $2.5 million compared to a gain of $31.6 million in the first nine months of 2013 and 2012, respectively. 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 securities, thereby increasing our investment yield and also improving the credit quality of our fixed maturity securities portfolio. We recognized a realized investment loss of $30.0 million on the sale of these securities. 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 loss of $0.3 million and a gain of $19.7 million in the third quarter of 2013 and 2012, respectively, and realized gains of $18.5 million and $28.7 million in the first nine months of 2013 and 2012, respectively.

The underlying risk results for the majority of our lines of business were generally consistent with or favorable to the prior year periods, with a consolidated benefit ratio of 86.5 percent and 86.4 percent in the third quarter and first nine months of 2013, respectively, compared to 87.4 percent and 87.1 percent in the same periods of 2012. 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 the third quarter and first nine months of 2013 was higher than the same periods of 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.

The deferral of acquisition costs in the third quarter and first nine months of 2013 was higher than the same periods of 2012 due to an increase in deferrable expenses in certain of our Unum US product lines. The amortization of acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 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 our Unum US supplemental and voluntary product lines in the first quarter of 2013, which increased our amortization on a year-to-date basis in 2013 relative to the prior year.

Other expenses, including compensation expense, were lower in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to our continued focus on operating effectiveness and expense management. Also, as a result of the plan amendments which we announced for our defined benefit pension plans, the amortization of our net actuarial loss, which is excluded from our operating results by segment but is reported in other expenses at the consolidated level, was lower in the third quarter and first nine months of 2013 relative to the prior year periods. The amortization of our net actuarial loss will be approximately $2.4 million before tax during the fourth quarter of 2013. For further discussion, see Note 8 in the "Notes to Consolidated Financial Statements" contained herein in Item 1.

Our income tax for the third quarter and first nine months of 2013 and 2012 includes third quarter reductions of $6.3 million and $9.3 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. Other items impacting our reported income tax rate include a release of an $11.0 million tax liability during the second quarter of 2012 related to unrecognized tax benefits. See Note 11 in the "Notes to Consolidated Financial Statements" contained herein in Item 1 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," "operating income" or "operating loss," and "after-tax operating income" differ from 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 realized investment gains or losses and non-operating retirement-related gains or losses as specified in the reconciliation 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.

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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 by segment 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 market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans. Plan amendments may also change the length of time over which the prior period actuarial gain or loss is amortized. 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 by segment to revenue, operating income by segment to net income, and after-tax operating income to net income is as follows:

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
Operating Revenue by Segment	$	2,567.0		$	2,606.7		$	7,770.1		$	7,825.6
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Total Revenue	$	2,540.9		$	2,628.0		$	7,767.6		$	7,857.2
Operating Income by Segment	$	312.9		$	310.7		$	932.4		$	930.0
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Non-operating Retirement-related Loss	(2.7		)	(11.6		)	(30.5		)	(34.8		)
Income Tax	(78.4		)	(90.2		)	(262.5		)	(266.3		)
Net Income	$	205.7		$	230.2		$	636.9		$	660.5

	Three Months Ended September 30
	2013						2012
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	224.6		$	0.85		$	224.0		$	0.80
Net Realized Investment Gain (Loss), Net of Tax	(17.2		)	(0.06		)	13.8			0.06
Non-operating Retirement-related Loss, Net of Tax	(1.7		)	(0.01		)	(7.6		)	(0.03		)
Net Income	$	205.7		$	0.78		$	230.2		$	0.83

	Nine Months Ended September 30
	2013						2012
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	658.7		$	2.47		$	662.5		$	2.33
Net Realized Investment Gain (Loss), Net of Tax	(1.9		)	(0.01		)	20.7			0.07
Non-operating Retirement-related Loss, Net of Tax	(19.9		)	(0.08		)	(22.7		)	(0.08		)
Net Income	$	636.9		$	2.38		$	660.5		$	2.32
* Assuming Dilution

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Consolidated Sales Results

Shown below are sales results for our three major business segments.

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2013		% Change		2012		2013		% Change		2012
Unum US	$	121.8	(0.8	)%	$	122.8	$	450.7	(6.0	)%	$	479.3
Unum UK	£	11.1	3.7	%	£	10.7	£	35.8	(21.5	)%	£	45.6
Colonial Life	$	76.1	(2.9	)%	$	78.4	$	227.8	(3.2	)%	$	235.3

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.

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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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income	$	1,124.6		1.1	%	$	1,111.9		$	3,395.8		1.7	%	$	3,338.9
Net Investment Income	233.1			(1.4	)	236.3			699.9			(1.7	)	711.8
Other Income	30.2			(3.5	)	31.3			99.0			6.3		93.1
Total	1,387.9			0.6		1,379.5			4,194.7			1.2		4,143.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	810.0			(0.2	)	811.7			2,432.6			0.4		2,422.3
Commissions	124.3			(0.1	)	124.4			382.9			(0.1	)	383.4
Interest and Debt Expense	—			(100.0	)	0.2			0.1			(87.5	)	0.8
Deferral of Acquisition Costs	(65.3		)	15.4		(56.6		)	(189.5		)	3.7		(182.8		)
Amortization of Deferred Acquisition Costs	49.7			17.5		42.3			181.2			21.5		149.1
Other Expenses	249.4			3.4		241.2			745.5			1.3		736.1
Total	1,168.1			0.4		1,163.2			3,552.8			1.3		3,508.9
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	219.8		1.6		$	216.3		$	641.9		1.1		$	634.9
Operating Ratios (% of Premium Income):
Benefit Ratio	72.0		%			73.0		%	71.6		%			72.5		%
Other Expense Ratio	22.2		%			21.7		%	22.0		%			22.0		%
Before-tax Operating Income Ratio	19.5		%			19.5		%	18.9		%			19.0		%

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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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	$	385.0		(1.9	)%	$	392.4		$	1,172.5		(1.1	)%	$	1,185.7
Group Short-term Disability	129.5			7.8		120.1			389.6			9.4		356.0
Total Premium Income	514.5			0.4		512.5			1,562.1			1.3		1,541.7
Net Investment Income	137.0			(4.1	)	142.9			416.2			(3.7	)	432.3
Other Income	23.1			(1.3	)	23.4			73.6			5.1		70.0
Total	674.6			(0.6	)	678.8			2,051.9			0.4		2,044.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	426.3			(2.0	)	435.1			1,307.3			—		1,307.6
Commissions	40.3			2.3		39.4			124.6			3.7		120.1
Interest and Debt Expense	—			(100.0	)	0.2			0.1			(87.5	)	0.8
Deferral of Acquisition Costs	(8.6		)	53.6		(5.6		)	(22.2		)	26.9		(17.5		)
Amortization of Deferred Acquisition Costs	5.4			17.4		4.6			15.8			18.8		13.3
Other Expenses	132.6			1.5		130.6			396.8			(0.8	)	400.1
Total	596.0			(1.4	)	604.3			1,822.4			(0.1	)	1,824.4
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	78.6		5.5		$	74.5		$	229.5		4.5		$	219.6
Operating Ratios (% of Premium Income):
Benefit Ratio	82.9		%			84.9		%	83.7		%			84.8		%
Other Expense Ratio	25.8		%			25.5		%	25.4		%			26.0		%
Before-tax Operating Income Ratio	15.3		%			14.5		%	14.7		%			14.2		%
Premium Persistency:
Group Long-term Disability									87.4		%			90.7		%
Group Short-term Disability									88.4		%			88.5		%
Case Persistency:
Group Long-term Disability									88.5		%			88.3		%
Group Short-term Disability									87.7		%			88.1		%

Premium income increased in the third quarter and first nine months of 2013 compared to the same periods of 2012, with growth from rate increases partially offset by a decline in premium persistency as well as lower sales during the first nine months of 2013. As previously discussed, the slow economic recovery, low levels of employment growth, and the competitive environment continue to pressure our premium income growth, including growth from existing customers. Net investment income declined in the third quarter and first nine months of 2013 relative to the same periods of 2012 due to decreases in both the level of invested assets and the yield on invested assets. Other income for the third quarter and first nine months of 2013 included fees from administrative services products of $19.4 million and $59.7 million, respectively, compared to $20.6 million and $61.3 million in the same periods of 2012. Also included in other income for the first nine months of 2013 is a gain of $4.0 million on the purchase and retirement in January 2013 of the debt issued by Tailwind Holdings.

Risk results were favorable in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to favorable claim incidence rates and continued strong claim recovery experience. On a year-to-date basis, 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.

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The deferral of acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to an increase in deferrable expenses. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to continued growth in the level of the deferred asset. The other expense ratio for the third quarter of 2013 was generally consistent with the same period of 2012 but was lower for the first nine months of 2013 compared to the first nine months of 2012 as we continue our focus on operating effectiveness and expense management relative to our premium income levels.

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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Group Life	$	305.2		2.7	%	$	297.3		$	911.0		2.9	%	$	885.1
Accidental Death & Dismemberment	30.5			4.5		29.2			91.6			6.3		86.2
Total Premium Income	335.7			2.8		326.5			1,002.6			3.2		971.3
Net Investment Income	36.5			1.7		35.9			107.3			(1.6	)	109.0
Other Income	0.6			—		0.6			1.5			—		1.5
Total	372.8			2.7		363.0			1,111.4			2.7		1,081.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	240.3			1.8		236.0			712.9			1.9		699.9
Commissions	27.4			5.0		26.1			83.0			6.1		78.2
Deferral of Acquisition Costs	(7.3		)	49.0		(4.9		)	(18.7		)	24.7		(15.0		)
Amortization of Deferred Acquisition Costs	4.0			21.2		3.3			11.7			17.0		10.0
Other Expenses	49.9			7.5		46.4			148.8			4.1		142.9
Total	314.3			2.4		306.9			937.7			2.4		916.0
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	58.5		4.3		$	56.1		$	173.7		4.8		$	165.8
Operating Ratios (% of Premium Income):
Benefit Ratio	71.6		%			72.3		%	71.1		%			72.1		%
Other Expense Ratio	14.9		%			14.2		%	14.8		%			14.7		%
Before-tax Operating Income Ratio	17.4		%			17.2		%	17.3		%			17.1		%
Premium Persistency:
Group Life									88.9		%			91.1		%
Accidental Death & Dismemberment									89.3		%			90.8		%
Case Persistency:
Group Life									88.5		%			88.0		%
Accidental Death & Dismemberment									88.6		%			88.2		%

Premium income was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to continued growth from sales and rate increases, partially offset by a decline in premium persistency. Net investment income increased in the third quarter of 2013 compared to the same period of 2012 but was lower for the first nine months of 2013 compared to the prior year. The yield on invested assets decreased year-over-year for both the third quarter and first nine months of 2013, offset partially by an increase in asset levels. Also impacting year-over-year variability were higher mortgage loan fees in the third quarter of 2013 relative to the prior year third quarter and lower bond call premiums for the first nine months of 2013 compared to the same period of 2012.

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Risk results were favorable in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to more favorable experience related to the waiver of group life premium benefit. The deferral of acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to an increase in deferrable expenses. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to continued growth in the level of the deferred asset. The other expense ratio was slightly elevated in the third quarter and first nine months of 2013 compared to the same periods of 2012 due partially to slightly higher litigation expenses.

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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	114.9		(4.2	)%	$	119.9		$	349.3		(2.2	)%	$	357.0
Voluntary Benefits	159.5			4.2		153.0			481.8			2.8		468.9
Total Premium Income	274.4			0.5		272.9			831.1			0.6		825.9
Net Investment Income	59.6			3.7		57.5			176.4			3.5		170.5
Other Income	6.5			(11.0	)	7.3			23.9			10.6		21.6
Total	340.5			0.8		337.7			1,031.4			1.3		1,018.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	143.4			2.0		140.6			412.4			(0.6	)	414.8
Commissions	56.6			(3.9	)	58.9			175.3			(5.3	)	185.1
Deferral of Acquisition Costs	(49.4		)	7.2		(46.1		)	(148.6		)	(1.1	)	(150.3		)
Amortization of Deferred Acquisition Costs	40.3			17.2		34.4			153.7			22.2		125.8
Other Expenses	66.9			4.2		64.2			199.9			3.5		193.1
Total	257.8			2.3		252.0			792.7			3.1		768.5
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	82.7		(3.5	)	$	85.7		$	238.7		(4.3	)	$	249.5
Operating Ratios (% of Premium Income):
Benefit Ratios:
Individual Disability - Recently Issued	53.4		%			53.0		%	50.9		%			52.2		%
Voluntary Benefits	51.4		%			50.4		%	48.7		%			48.7		%
Other Expense Ratio	24.4		%			23.5		%	24.1		%			23.4		%
Before-tax Operating Income Ratio	30.1		%			31.4		%	28.7		%			30.2		%
Interest Adjusted Loss Ratio:
Individual Disability - Recently Issued	31.6		%			31.7		%	29.3		%			30.9		%
Premium Persistency:
Individual Disability - Recently Issued									90.6		%			90.8		%
Voluntary Benefits									77.0		%			79.2		%

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Premium income was generally consistent in the third quarter and first nine months of 2013 compared to the same periods of 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. Premium persistency in the voluntary benefits product line declined relative to the prior year due to a high level of policy terminations in the first quarter of 2013. Net investment income was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to an increase in the level of invested assets and higher bond call premiums, partially offset by a decline in the yield on invested assets.

Risk results for the individual disability - recently issued product line during the third quarter of 2013 reflect claim experience which was generally consistent with the prior year comparable period. Impacting the comparability of risk results for the individual disability - recently issued line of business for the first nine months of 2013 relative to 2012 is a release of active life reserves related to the termination of a large inforce policy in the first quarter of 2013. Overall risk results for the voluntary benefits product line were slightly less favorable in the third quarter of 2013 compared to the same period of 2012 due to unfavorable disability and critical illness product claim experience, but overall risk results were consistent in the first nine months of 2013 compared to the same period of 2012.

Commissions were lower in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to amounts ceded related to the individual disability reinsurance contract as previously discussed. The deferral of acquisition costs was higher in the third quarter due to an increase in deferrable expenses but was generally consistent for the first nine months of 2013 compared to the same period of 2012. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 primarily due to a less favorable year-over-year impact from the prospective unlocking of assumptions related to our interest-sensitive voluntary life products in the third quarter of 2013 as well as a higher level of policy terminations in the first quarter of 2013 relative to assumptions for certain issue years within certain of our product lines. The other expense ratio in the third quarter and first nine months of 2013 was higher than the comparable periods of 2012 primarily due to lower premium income resulting from the reinsurance contract entered into during the second quarter of 2013 in our individual disability - recently issued product line.

Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2013		% Change		2012		2013		% Change		2012
Sales by Product
Group Disability, Group Life, and AD&D
Group Long-term Disability	$	25.7	8.9	%	$	23.6	$	89.6	(6.1	)%	$	95.4
Group Short-term Disability	12.8		(9.2	)	14.1		47.3		(7.4	)	51.1
Group Life	23.3		(4.9	)	24.5		90.6		(11.8	)	102.7
AD&D	2.2		—		2.2		8.2		(18.0	)	10.0
Subtotal	64.0		(0.6	)	64.4		235.7		(9.1	)	259.2
Supplemental and Voluntary
Individual Disability - Recently Issued	11.2		(23.3	)	14.6		36.6		(18.3	)	44.8
Voluntary Benefits	46.6		6.4		43.8		178.4		1.8		175.3
Subtotal	57.8		(1.0	)	58.4		215.0		(2.3	)	220.1
Total Sales	$	121.8	(0.8	)	$	122.8	$	450.7	(6.0	)	$	479.3
Sales by Market Sector
Group Disability, Group Life, and AD&D
Core Market (< 2,000 lives)	$	53.3	1.9	%	$	52.3	$	170.0	(12.3	)%	$	193.8
Large Case Market	10.7		(11.6	)	12.1		65.7		0.5		65.4
Subtotal	64.0		(0.6	)	64.4		235.7		(9.1	)	259.2
Supplemental and Voluntary	57.8		(1.0	)	58.4		215.0		(2.3	)	220.1
Total Sales	$	121.8	(0.8	)	$	122.8	$	450.7	(6.0	)	$	479.3

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Unum US sales were lower in the third quarter and first nine months of 2013 compared to the same periods of 2012, with lower overall sales in both our group and supplemental and voluntary product lines. By market sector, sales in our group core market segment increased by almost two percent in the third quarter compared to the prior year, with higher group long-term disability sales partially offset by lower sales in the remaining group product lines. Sales in our group core market segment were lower for all product lines in the first nine months of 2013 relative to the prior year. The number of new accounts added in our group core market segment during the third quarter and first nine months of 2013 decreased by approximately 19 percent and 24 percent, respectively, compared to the same periods of 2012. The decline in the number of new accounts was driven by fewer sales opportunities in the small-size employer market segment during the third quarter and first nine months of 2013, which we believe may be temporarily attributable to the uncertain economic and political environment as well as healthcare reform.

Sales in the group large case market segment declined in each of our group product lines in the third quarter of 2013 compared to the same period of 2012 as we continued our disciplined and opportunistic approach to sales growth in the large case market. Sales in the group large case market segment were generally consistent in the first nine months of 2013 compared to the same prior year period. Our sales mix in the first nine months of 2013 was approximately 72 percent core market and 28 percent large case market.

Sales of voluntary benefits were higher in the third quarter and first nine months of 2013 compared to the same periods of 2012, with increases in both core and large case market sales driven by growth in sales to new customers. Although sales to new customers increased, the number of new accounts added in the voluntary benefits product line decreased by approximately two percent and six percent in the third quarter and first nine months of 2013, respectively, compared to the same periods of 2012. Sales in our individual disability - recently issued line of business, which are primarily concentrated in the multi-life market, were lower in the third quarter and first nine months of 2013 compared to the same periods of 2012 driven by lower sales to new and existing customers.

We believe that the group core market and voluntary benefits market, which combined together were approximately 77 percent of our Unum US sales for the first nine months of 2013, represent significant growth opportunities. We also 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 we have implemented 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.

Segment Outlook

We believe that premium and sales growth, particularly growth in existing customer accounts, will continue to be pressured 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 continue to achieve marginal year-over-year growth in our premium income during 2013 and beyond, opportunities for further premium and sales 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 calls and other types of miscellaneous net investment income. Although there has been sporadic improvement during 2013, the low interest rate environment has continued 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 the price increases throughout 2013. We anticipate that the benefit ratio for our group disability product line for 2013 will be slightly below the level of 2012. We think future profit margin improvement is achievable, driven primarily by our continued product mix shift, expense efficiencies, and consistent claims management. The unfavorable impact to amortization of deferred acquisition costs which resulted from the policy terminations which we experienced during the first quarter of 2013, particularly in our voluntary benefits product line, stabilized during the second and third quarters of 2013. Our amortization may continue to be unfavorably impacted, particularly in our voluntary benefits product line, by higher than expected policy terminations.

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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. We believe our claims management organization is positioned for stable and sustainable performance levels. 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 believe our Unum US growth strategy is sound and that we will be able to leverage the capabilities, products, and relationships and reputation we have built to deliver growth as the benefits market stabilizes. We continue to see future growth opportunity based on employee choice, defined employer funding, superior service, and effective communication. We intend to maintain our discipline and will continue (i) directing the majority of our efforts on capturing opportunities emerging in our core group and voluntary markets to grow them at above-market rates, (ii) focusing on margins in large case group insurance, while leveraging core market, voluntary, and other shorter-term investments to grow at market rates, and (iii) seeking opportunities to improve margins and return in our supplemental lines of business. We believe we are well positioned strategically in our markets and that opportunities for continued disciplined growth exist in our group core market segment and in the voluntary markets.

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Unum UK Segment

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental and voluntary lines of business. The supplemental and voluntary lines of business are comprised of individual disability, critical illness, and voluntary benefits products. 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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	$	96.5		(6.2	)%	$	102.9		$	290.7		(5.2	)%	$	306.5
Group Life	25.6			(54.6	)	56.4			83.1			(49.5	)	164.6
Supplemental and Voluntary	15.2			(4.4	)	15.9			44.9			(6.5	)	48.0
Total Premium Income	137.3			(21.6	)	175.2			418.7			(19.3	)	519.1
Net Investment Income	30.3			(12.9	)	34.8			106.5			(11.6	)	120.5
Other Income	0.1			—		—			0.1			—		0.1
Total	167.7			(20.1	)	210.0			525.3			(17.9	)	639.7
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	96.9			(28.9	)	136.2			312.7			(23.3	)	407.7
Commissions	9.6			(13.5	)	11.1			28.4			(10.4	)	31.7
Deferral of Acquisition Costs	(2.4		)	(14.3	)	(2.8		)	(7.1		)	(28.3	)	(9.9		)
Amortization of Deferred Acquisition Costs	3.6			(5.3	)	3.8			11.2			(5.1	)	11.8
Other Expenses	28.7			(16.1	)	34.2			84.0			(17.7	)	102.1
Total	136.4			(25.3	)	182.5			429.2			(21.0	)	543.4
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	31.3		13.8		$	27.5		$	96.1		(0.2	)	$	96.3
Operating Ratios (% of Premium Income):
Benefit Ratio	70.6		%			77.7		%	74.7		%			78.5		%
Other Expense Ratio	20.9		%			19.5		%	20.1		%			19.7		%
Before-tax Operating Income Ratio	22.8		%			15.7		%	23.0		%			18.6		%
Premium Persistency:
Group Long-term Disability									81.9		%			82.9		%
Group Life									64.8		%			80.3		%
Supplemental and Voluntary									78.6		%			87.0		%

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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 the third quarter and first nine months of 2013 compared to the same periods of 2012, translating pounds into dollars decreases current period results relative to the prior period.

(in millions of pounds, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	£	62.2		(4.3	)%	£	65.0		£	188.0		(3.1	)%	£	194.1
Group Life	16.5			(53.8	)	35.7			53.8			(48.4	)	104.3
Supplemental and Voluntary	9.7			(4.0	)	10.1			29.0			(4.6	)	30.4
Total Premium Income	88.4			(20.2	)	110.8			270.8			(17.6	)	328.8
Net Investment Income	19.5			(11.8	)	22.1			68.9			(9.8	)	76.4
Other Income	0.1			200.0		(0.1		)	0.1			—		—
Total	108.0			(18.7	)	132.8			339.8			(16.1	)	405.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	62.4			(27.6	)	86.2			202.3			(21.6	)	258.1
Commissions	6.1			(12.9	)	7.0			18.3			(9.0	)	20.1
Deferral of Acquisition Costs	(1.5		)	(16.7	)	(1.8		)	(4.6		)	(27.0	)	(6.3		)
Amortization of Deferred Acquisition Costs	2.3			(8.0	)	2.5			7.3			(2.7	)	7.5
Other Expenses	18.6			(13.9	)	21.6			54.4			(15.9	)	64.7
Total	87.9			(23.9	)	115.5			277.7			(19.3	)	344.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	£	20.1		16.2		£	17.3		£	62.1		1.6		£	61.1
Weighted Average Pound/Dollar Exchange Rate	1.557					1.590			1.548					1.576

Premium income was lower in the third quarter and first nine months of 2013 compared to the same periods of 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 have significantly decreased premium income and benefit payments for group life during 2013 and have also reduced volatility in this line of business. Premium income in the third quarter and first nine months of 2013 was also unfavorably impacted by continued pressure on premium 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 the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to decreases in both the yield on invested assets and in the level of invested assets.

Group long-term disability risk results were unfavorable in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to lower claim recoveries. Group life risk results were favorable in the third quarter and first nine months of 2013 compared to the same periods last year due primarily to the impact of the reinsurance agreements entered into in 2013. Supplemental and voluntary risk results were unfavorable in the third quarter of 2013 compared to the same period of 2012 due to higher claim incidence rates in the individual disability product line but were favorable in the first nine months of 2013 compared to the same period of 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 the third quarter and first nine months of 2013 compared to the same periods of 2012 due to expenses ceded under the group life reinsurance agreements and a lower level of year-to-date sales in 2013. The amortization of deferred acquisition costs was generally consistent in the third quarter and first nine months of 2013 compared to the same prior year periods. The other expense ratio was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to lower premium income partially offset by expense allowances related to the group life reinsurance agreements and continued expense management initiatives.

Sales

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

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2013		% Change		2012		2013		% Change		2012
Sales by Product
Group Long-term Disability	$	10.3	(1.0	)%	$	10.4	$	35.0	(0.3	)%	$	35.1
Group Life	6.1		8.9		5.6		17.4		(46.8	)	32.7
Supplemental and Voluntary	0.9		(10.0	)	1.0		3.0		(25.0	)	4.0
Total Sales	$	17.3	1.8		$	17.0	$	55.4	(22.8	)	$	71.8
Sales by Market Sector
Group Long-term Disability and Group Life
Core Market (< 500 lives)	$	8.7	(11.2	)%	$	9.8	$	27.8	(9.7	)%	$	30.8
Large Case Market	7.7		24.2		6.2		24.6		(33.5	)	37.0
Subtotal	16.4		2.5		16.0		52.4		(22.7	)	67.8
Supplemental and Voluntary	0.9		(10.0	)	1.0		3.0		(25.0	)	4.0
Total Sales	$	17.3	1.8		$	17.0	$	55.4	(22.8	)	$	71.8
Sales by Product
Group Long-term Disability	£	6.6	1.5	%	£	6.5	£	22.6	1.8	%	£	22.2
Group Life	3.8		8.6		3.5		11.2		(46.2	)	20.8
Supplemental and Voluntary	0.7		—		0.7		2.0		(23.1	)	2.6
Total Sales	£	11.1	3.7		£	10.7	£	35.8	(21.5	)	£	45.6
Sales by Market Sector
Group Long-term Disability and Group Life
Core Market (< 500 lives)	£	5.5	(8.3	)%	£	6.0	£	17.9	(7.7	)%	£	19.4
Large Case Market	4.9		22.5		4.0		15.9		(32.6	)	23.6
Subtotal	10.4		4.0		10.0		33.8		(21.4	)	43.0
Supplemental and Voluntary	0.7		—		0.7		2.0		(23.1	)	2.6
Total Sales	£	11.1	3.7		£	10.7	£	35.8	(21.5	)	£	45.6

Sales in Unum UK's group long-term disability product line during the third quarter and first nine months of 2013 were slightly higher than sales in the same periods of 2012, with increased sales in the core market segment mostly offset by a decline in sales in the large case market segment. Group life sales were higher in the third quarter but lower in the first nine months of 2013 compared to the same periods of 2012. The increase in group life sales in the third quarter of 2013 was driven by higher sales to existing customers in the large case market segment, partially offset by lower sales to new customers in the core market segment. The group life sales decrease in the first nine months of 2013 compared to the same period of 2012 was the result of sales declines in both the core and large case market segments, 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 the third quarter and first nine months of 2012 was the discontinuance of new sales of certain of our group life product lines during the third quarter of 2012. Supplemental and voluntary sales were consistent in the third quarter of 2013 compared to the same period of 2012 but were lower on a year-to-date basis due primarily to lower sales in our group critical illness and individual disability product lines. We define the core market segment for Unum UK to be employee groups with fewer than 500 lives.

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Segment Outlook

Our primary focus during 2013 is to stabilize profitability and improve growth over the medium term. Our shift in business mix and focus on premium rate increases for both group long-term disability and group life is expected to improve profitability. However, pressure on new sales and persistency is likely, and the low interest rate environment is expected to dampen overall earnings growth. 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 long-term disability business, 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. 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.

In our group life business, we continue to implement rate increases, and we discontinued offering new business for certain group life product lines in 2012. We believe profit margins will improve as a result of these actions. We also expect group life premium income may decline as a result of these actions and a shift in business mix, but through the first nine months of 2013, the increase to premium income from rate increases has offset the impact of policy terminations. As previously noted, we entered into reinsurance agreements effective January 1, 2013 to cede an additional portion of our group life business. These reinsurance agreements will significantly decrease premium income and benefit payments throughout 2013 but are expected to continue to reduce volatility in our group life line of business.

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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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	185.0		1.8	%	$	181.8		$	554.5		2.3	%	$	541.8
Life	55.6			6.5		52.2			165.7			6.0		156.3
Cancer and Critical Illness	68.5			4.7		65.4			203.9			4.8		194.5
Total Premium Income	309.1			3.2		299.4			924.1			3.5		892.6
Net Investment Income	36.3			7.1		33.9			110.3			6.6		103.5
Other Income	—			—		—			0.1			(50.0	)	0.2
Total	345.4			3.6		333.3			1,034.5			3.8		996.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	164.0			3.5		158.5			485.6			3.6		468.7
Commissions	61.9			(3.3	)	64.0			188.4			(1.5	)	191.2
Deferral of Acquisition Costs	(50.1		)	(2.9	)	(51.6		)	(152.7		)	(1.4	)	(154.9		)
Amortization of Deferred Acquisition Costs	45.3			10.8		40.9			131.3			5.3		124.7
Other Expenses	55.3			4.7		52.8			166.4			3.6		160.6
Total	276.4			4.5		264.6			819.0			3.6		790.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	69.0		0.4		$	68.7		$	215.5		4.6		$	206.0
Operating Ratios (% of Premium Income):
Benefit Ratio	53.1		%			52.9		%	52.5		%			52.5		%
Other Expense Ratio	17.9		%			17.6		%	18.0		%			18.0		%
Before-tax Operating Income Ratio	22.3		%			22.9		%	23.3		%			23.1		%
Persistency:
Accident, Sickness, and Disability									75.5		%			75.3		%
Life									85.3		%			85.2		%
Cancer and Critical Illness									83.5		%			84.3		%

Premium income increased in the third quarter and first nine months of 2013 relative to the same periods of 2012 due to continued growth in the inforce block of business as a result of sales and stable persistency. Net investment income increased in the third quarter and first nine months of 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.

Overall risk results were generally consistent in the third quarter and first nine months of 2013 relative to the same periods of 2012. For the third quarter of 2013, improved claim experience in the cancer and critical illness product line was offset by less favorable risk experience in the life product line and the accident, sickness, and disability product line. For the first nine months, favorable risk results in the life and accident, sickness, and disability product lines offset less favorable risk results in our cancer and critical illness line of business.

In the third quarter and first nine months of 2013, commissions and the deferral of acquisition costs were lower than the same periods of 2012 due to a lower level of sales in the current year. The amortization of deferred acquisition costs was higher in

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the third quarter and first nine months of 2013 compared to the same periods of 2012 due to continued growth in the level of the deferred asset as well as an unfavorable year-over-year impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive life products. The increase in other expenses in the third quarter and first nine months of 2013 compared to the same periods of 2012 was fairly commensurate with the growth in premium income.

Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2013		% Change		2012		2013		% Change		2012
Sales by Product
Accident, Sickness, and Disability	$	50.2	(2.7	)%	$	51.6	$	148.6	(4.0	)%	$	154.8
Life	13.7		(4.9	)	14.4		43.0		(2.7	)	44.2
Cancer and Critical Illness	12.2		(1.6	)	12.4		36.2		(0.3	)	36.3
Total Sales	$	76.1	(2.9	)	$	78.4	$	227.8	(3.2	)	$	235.3
Sales by Market Sector
Commercial
Core Market (<1,000 lives)	$	52.5	(6.4	)%	$	56.1	$	161.9	(4.0	)%	$	168.6
Large Case Market	6.8		17.2		5.8		22.1		1.4		21.8
Subtotal	59.3		(4.2	)	61.9		184.0		(3.4	)	190.4
Public Sector	16.8		1.8		16.5		43.8		(2.4	)	44.9
Total Sales	$	76.1	(2.9	)	$	78.4	$	227.8	(3.2	)	$	235.3

Colonial Life's sales were lower in the third quarter and first nine months of 2013 relative to the same periods of 2012 due to a decrease in new account sales, partially offset by a slight increase in sales to existing accounts. Commercial market sales declined in the third quarter and first nine months of 2013 compared to the same periods of 2012, with a decline in our core commercial market, which we define as accounts with fewer than 1,000 lives, partially offset by higher sales in the large case market. In particular, the decline occurred primarily in the fewer than 50 lives segment of our core market. We believe the decrease in core commercial market sales, particularly in the small employer segment, may be partially attributable to the uncertain economic and political environment as well as healthcare reform. Total public sector market sales increased in the third quarter but declined in the first nine months of 2013 compared to the same periods of 2012. The number of new accounts decreased 28.1 percent and 22.0 percent, respectively, in the third quarter and first nine months of 2013 compared to the same periods of 2012, while the average new case size increased 25.6 percent and 14.9 percent, respectively.

Segment Outlook

Current economic conditions continue to affect employment growth and buying conditions which, in turn, impact sales and premium growth. While lower than expected sales presents a challenge in the near term, 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.

Premium growth has remained positive during the first nine months of 2013 due primarily to continued growth in our inforce block resulting from sales and stable persistency. We expect our sales momentum to improve during the remainder of 2013, further contributing to continued premium growth. We expect volatility in net investment income to continue during the remainder of 2013 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. Periods of economic downturns have historically had minimal impact on the risk results of Colonial Life, due primarily to a diversified product portfolio that is designed with short duration, indemnity benefits.  We believe that strong profit margins will continue, and we expect our overall benefit ratio for 2013 to remain generally consistent with the level of 2012.

We believe we have a stable business model, with service levels and customer retention that allow us to focus on and deliver premium growth despite the recent marketplace changes and uncertainties. We believe we are well positioned for growth and that opportunities exist to accelerate growth during the next several years by (i) focusing on target market segments, (ii) driving new sales in the public sector market, (iii) growing the reach and effectiveness of our distribution, and (iv) effectively serving our customers.

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Closed Block Segment

The Closed Block segment consists of individual disability, group and individual long-term care, and certain 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 individual life and corporate-owned life insurance, reinsurance pools and management operations, group pension, health insurance, and individual annuities.

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Premium Income
Individual Disability	$	169.3		(7.5	)%	$	183.1		$	521.7		(6.0	)%	$	554.9
Long-term Care	157.0			(1.5	)	159.4			473.6			0.4		471.5
All Other	—			(100.0	)	0.4			0.1			(94.7	)	1.9
Total Premium Income	326.3			(4.8	)	342.9			995.4			(3.2	)	1,028.3
Net Investment Income	315.4			2.6		307.3			944.6			3.4		913.4
Other Income	23.6			(10.6	)	26.4			71.5			(9.4	)	78.9
Total	665.3			(1.7	)	676.6			2,011.5			(0.5	)	2,020.6
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	570.7			(1.7	)	580.5			1,721.0			(0.8	)	1,734.3
Commissions	26.8			(5.0	)	28.2			81.9			(3.1	)	84.5
Interest and Debt Expense	2.1			(16.0	)	2.5			6.4			(19.0	)	7.9
Other Expenses	40.0			0.5		39.8			119.6			(6.0	)	127.2
Total	639.6			(1.8	)	651.0			1,928.9			(1.3	)	1,953.9
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	25.7		0.4		$	25.6		$	82.6		23.8		$	66.7
Interest Adjusted Loss Ratios:
Individual Disability	80.6		%			82.5		%	81.6		%			82.7		%
Long-term Care	89.6		%			91.3		%	89.7		%			90.1		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	12.3		%			11.6		%	12.0		%			12.4		%
Before-tax Operating Income Ratio	7.9		%			7.5		%	8.3		%			6.5		%
Premium Persistency:
Individual Disability									92.0		%			92.6		%
Long-term Care									95.4		%			95.7		%

Total premium income decreased in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to expected policy terminations and maturities. For the first nine months of 2013, the premium decrease due to policy lapses for the long-term care line of business was more than 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.

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Net investment income was higher in the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to higher invested asset levels. 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 the third quarter and first nine months of 2013 compared to the same periods of 2012 due primarily to a lower level of tax-related reimbursements received by us from the ceding companies and lower investment income in the portfolios held by the ceding companies.

Individual disability risk results for the third quarter of 2013 were favorable compared to the same period of 2012 due primarily to a lower average claim size, partially offset by unfavorable claim recovery and mortality rates. Individual disability risk results for the first nine months of 2013 were favorable primarily due to a lower claim incidence rate, partially offset by unfavorable claim recovery rates. Long-term care risk results were favorable in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to more favorable development in active life reserves.

Interest and debt expense in the third quarter and first nine months of 2013 was lower than the same periods of 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 higher in the third quarter compared to the same period of 2012 due primarily to the decrease in premium income. The other expense ratio was lower for the first nine months of 2013 compared to the same period of 2012 primarily due to a decrease in selling and underwriting costs driven by our discontinuance of the sale of group long-term care in 2012 and our continued focus on operating effectiveness and expense management.

Segment Outlook

We expect that this segment may experience volatility in net investment income due to the volatility of bond call premiums relative to historical levels. We expect that 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. 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)
	Three Months Ended September 30								Nine Months Ended September 30
	2013			% Change		2012			2013			% Change		2012
Operating Revenue
Net Investment Income	$	0.4		(94.2	)%	$	6.9		$	1.4		(93.9	)%	$	23.0
Other Income	0.3			(25.0	)	0.4			2.7			22.7		2.2
Total	0.7			(90.4	)	7.3			4.1			(83.7	)	25.2
Interest and Other Expenses	33.6			(3.2	)	34.7			107.8			8.8		99.1
Operating Loss Before Non-operating Retirement-related Loss, Income Tax, and Net Realized Investment Gains and Losses	$	(32.9	)	(20.1	)	$	(27.4	)	$	(103.7	)	(40.3	)	$	(73.9	)

Net investment income was lower in the third quarter and first nine months of 2013 compared to the same periods of 2012 due to a decrease in investment income attributable to tax credit partnerships, lower short-term interest rates, and a decrease in the yield on invested assets. The negative impact on net investment income and operating income by segment 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.

Interest and other expenses were slightly lower in the third quarter but were higher in the first nine months of 2013 compared to the same periods of 2012. The increase over the prior year first nine months was due primarily to the issuance of $250.0 million senior notes in August 2012, partially offset by a lower rate of interest on fixed rate debt that we have effectively converted to floating rate debt.

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 2013. 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

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.

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.

For information on our valuation of investments and our formal investment policy, including our overall quality and diversification objectives, see "Investments" in Part I, Item 1 and "Critical Accounting Estimates" and "Investments" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012.

Investment Results

Net investment income was slightly lower in the third quarter and first nine months of 2013 relative to the same periods of 2012 due primarily to a decrease in the yield on invested assets, partially offset by a higher level of assets. Net investment income from bond calls and private equity partnership investments increased slightly in the third quarter and first nine months of 2013 relative to the same periods of 2012, but on an operating segment level investment income from those sources exhibited more year-over-year volatility.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.32 percent as of September 30, 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. As previously noted, 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.

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

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
Fixed Maturity Securities
Gross Gains on Sales	$	4.3		$	4.6		$	13.5		$	14.0
Gross Losses on Sales	(33.0		)	(2.3		)	(40.1		)	(9.0		)
Other-Than-Temporary Impairment Loss	—			—			(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	5.6			2.3			14.6			2.3
Impairment Loss	(1.0		)	(1.3		)	(2.0		)	(1.8		)
Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7			18.5			28.7
Other Derivatives	(1.0		)	—			(1.5		)	—
Foreign Currency Transactions	(0.7		)	(1.7		)	(4.7		)	(2.6		)
Net Realized Investment Gain (Loss)	$	(26.1	)	$	21.3		$	(2.5	)	$	31.6

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.

We had no individual realized investment losses of $10.0 million or greater from either other-than-temporary impairments or the sale of fixed-maturity securities during the third quarter or first nine months of 2013 or 2012.

Embedded Derivative in a Modified Coinsurance Arrangement

We report changes in the fair value of an embedded derivative in a modified coinsurance arrangement as realized investment gains and losses, as required under the provisions of GAAP. GAAP requires us to 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, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down. We therefore view the effect of realized gains and losses recognized for this embedded derivative as a reporting requirement that will not result in a permanent change in assets or stockholders' equity.

The change in fair value of this embedded derivative recognized as a realized gain or loss during the third quarter and first nine months of 2013 and 2012 resulted primarily from a change in credit spreads in the overall investment market. The fair value of this embedded derivative was $(65.4) million at September 30, 2013, compared to $(83.9) million at December 31, 2012, and is reported in other liabilities in our consolidated balance sheets.

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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 September 30, 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	$	2,423.1	$	160.5	$	516.8	$	39.1	$	1,906.3	$	199.6
Capital Goods	3,693.4		359.3		454.6		17.3		3,238.8		376.6
Communications	2,828.2		313.3		339.8		23.9		2,488.4		337.2
Consumer Cyclical	1,163.9		116.8		144.8		8.8		1,019.1		125.6
Consumer Non-Cyclical	5,668.4		597.3		844.2		50.1		4,824.2		647.4
Energy (Oil & Gas)	3,696.5		461.8		344.1		19.2		3,352.4		481.0
Financial Institutions	3,455.2		277.4		215.6		8.6		3,239.6		286.0
Mortgage/Asset-Backed	2,161.6		214.6		51.0		1.4		2,110.6		216.0
Sovereigns	1,375.3		172.2		32.4		2.0		1,342.9		174.2
Technology	1,125.0		77.7		356.7		21.0		768.3		98.7
Transportation	1,419.1		173.0		117.0		5.9		1,302.1		178.9
U.S. Government Agencies and Municipalities	2,993.0		296.7		420.9		41.2		2,572.1		337.9
Public Utilities	10,556.7		1,184.6		807.5		49.1		9,749.2		1,233.7
Redeemable Preferred Stocks	38.2		5.2		—		—		38.2		5.2
Total	$	42,597.6	$	4,410.4	$	4,645.4	$	287.6	$	37,952.2	$	4,698.0

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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 September 30, 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 September 30, 2013. The increase in the unrealized loss on both investment-grade and below-investment-grade fixed maturity securities during the third quarter of 2013 was due primarily to an increase in U.S. Treasury rates which occurred during the period. We held one fixed maturity security at September 30, 2013 with a gross unrealized loss of $10.0 million or greater. This below-investment-grade security had a fair value of $30.4 million and a gross unrealized loss of $10.0 million as of September 30, 2013, and is reported in the Basic Industry classification category.

Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013						2012
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	12.3	$	176.6	$	9.7	$	3.9	$	0.7
> 90 <= 180 days	175.7		12.6		6.3		0.4		0.4
> 180 <= 270 days	12.3		12.3		0.4		0.4		0.9
> 270 days <= 1 year	9.5		0.1		0.1		0.3		—
> 1 year <= 2 years	1.0		1.7		0.5		0.2		9.3
> 2 years <= 3 years	0.1		3.4		3.3		5.9		8.9
> 3 years	10.2		9.1		7.5		12.3		17.8
Total	$	221.1	$	215.8	$	27.8	$	23.4	$	38.0

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013						2012
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	4.3	$	33.3	$	3.0	$	0.3	$	4.1
> 90 <= 180 days	38.1		1.6		0.4		1.4		3.9
> 180 <= 270 days	2.0		—		0.6		2.6		5.4
> 270 days <= 1 year	—		0.5		0.3		2.5		3.9
> 1 year <= 2 years	6.8		3.9		4.9		6.8		4.5
> 2 years <= 3 years	—		1.2		1.0		6.2		9.4
> 3 years	15.0		12.7		8.0		12.5		20.7
Sub-total	66.2		53.2		18.2		32.3		51.9
Fair Value < 70% >= 40% of Amortized Cost
> 3 years	0.3		0.3		0.3		0.3		1.1
Total	$	66.5	$	53.5	$	18.5	$	32.6	$	53.0

At September 30, 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 September 30, 2013, we held $196.6 million fair value ($184.5 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.

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At September 30, 2013, our mortgage/asset-backed securities had an average life of 5.09 years, effective duration of 4.28 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 September 30, 2013, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $3,078.0 million and $3,141.6 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.

Investments in Issuers in Certain European Countries and Other Countries with Risk of Sovereign Default

Our investments 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, including that within certain countries in the European Union, specifically Greece, Ireland, Italy, Portugal, and Spain. Our monitoring is heightened for investments in these specific 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.  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.

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. We have no investments in issuers domiciled in Greece as of September 30, 2013. Our previous holding domiciled in Greece changed its domicile to Switzerland during the second quarter of 2013.

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European Fixed Maturity Securities Exposure - By Country

As of September 30, 2013

(in millions of dollars)
	Fair Value		Amortized Cost
Ireland	$	135.8	$	134.8
Italy	233.5		235.1
Portugal	48.7		46.7
Spain	239.5		223.2
Total	$	657.5	$	639.8

Discussion on our exposure to each country is as follows:

Ireland

We have no direct exposure to Irish financial institutions.  In November 2010, Ireland received a support package valued at €85 billion from the International Monetary Fund/European Union based on its plan of recovery. Thus far, Ireland appears committed to fiscal consolidation.  However, we believe there are risks associated with the austerity and recessionary pressures.  As of September 30, 2013, all of our Irish investments werecurrent 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 nine months ended September 30, 2013.

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 recessionary pressures. As of September 30, 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 nine months ended September 30, 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.  We believe there is risk that Portugal will be unable to achieve the deficit reduction targets set out in this loan agreement, and future aid may be required. As of September 30, 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 September 30, 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, large budget deficit, banking sector problems, recessionary pressures, and potential regional secession issues. All but one of our Spanish domiciled securities were rated investment-grade as of September 30, 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 nine months ended September 30, 2013.

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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.

Mortgage Loans

Our mortgage loan portfolio was $1,776.1 million and $1,712.7 million on an amortized cost basis at September 30, 2013 and December 31, 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 September 30, 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 risk, duration, currency,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. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $0.4 million at September 30, 2013. We held $1.3 million of cash collateral from our counterparties at September 30, 2013. The carrying value of fixed maturity securities posted as collateral to our counterparties was $91.5 million at September 30, 2013. We had no cash collateral posted to our counterparties at September 30, 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 September 30, 2013 and December 31, 2012, respectively.

See Notes 4 and 5 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our investments and our derivative financial instruments.

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Liquidity and Capital Resources

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.

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.

We have met all minimum pension funding requirements set forth by the Employee Retirement Income Security Act. We made a voluntary contribution of $50.0 million to our U.S. qualified defined benefit plan during the second quarter of 2013. We do not expect to make additional contributions during 2013. We also contribute to our U.K. pension plan sufficient to meet the minimum funding requirement under U.K. legislation. We made required contributions of £1.8 million during the first nine months of 2013, and we expect to make an additional required contribution of approximately £0.8 million during the fourth quarter of 2013.

In June and September 2013, we adopted plan amendments which freeze participation and benefit accruals in our defined benefit pension plans in the U.S. and U.K., respectively, 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 also required to remeasure the benefit obligations of our pension plans, which decreased our net pension liability approximately $330 million as of September 30, 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.

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 8 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our plan amendments.

In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $281.6 million at September 30, 2013. During the first nine months of 2013, we repurchased 9.8 million shares at a cost of $268.5 million, including commissions.

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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 $678 million and $805 million at September 30, 2013 and December 31, 2012, respectively. The September 30, 2013 balance, of which $239 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 2.3 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 and that our current level of holding company cash and marketable securities can be utilized to mitigate potential losses from defaults. 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.

We are evaluating various options for our Bermuda-based insurance subsidiary with the intention of re-domesticating it under a U.S. domiciled regulator.  We currently estimate that the financial impact from taking these steps, if completed during the fourth quarter of 2013, would result in a U.S.-based insurance subsidiary with a financial profile consistent with our U.S.-based traditional insurance subsidiaries while maintaining our weighted average risk-based capital ratio within our target range of 375 percent to 400 percent and the cash and marketable securities in our holding companies within our target range of $500 million to $800 million at year-end 2013. This transaction, if completed in the fourth quarter of 2013, would have no material impact on net income for 2013.

Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $709.5 million for the first nine months of 2013, compared to $953.8 million in the same period of 2012. 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 $56.3 million and $59.5 million to our defined benefit pension plans in the first nine months of 2013 and 2012, respectively.

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 provided by investing activities was $70.8 million for the first nine months of 2013, compared to net cash used by investing activities of $869.9 million in the same period of 2012.

Proceeds from sales of fixed maturity securities increased in the first nine months of 2013 compared to the same period in 2012 due to the sale of 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 with a higher credit quality. Proceeds from maturities of fixed maturity securities were slightly higher in the first nine months of 2013 compared to the same period in 2012 primarily due to an increase in proceeds from scheduled maturities and redemption payments, partially offset by a decrease in proceeds from prepayments on mortgage-backed securities and a decrease in bond calls. 

Proceeds from sales and maturities of other investments were higher in the first nine months of 2013 compared to the same period in 2012 due to an increase in distributions received from our private equity partnerships, an increase in mortgage loan principal payments, and an increase in real estate sales proceeds, partially offset by a decrease in proceeds received from derivatives used in our cash flow hedging programs.  

Purchases of fixed maturity securities were higher in the first nine months of 2013 compared to the same period in 2012 due to the reinvestment of proceeds from sales of fixed maturity securities. Purchases of other investments increased in the first nine months of 2013 compared to the same period in 2012 due primarily to an increase in funding of mortgage loans.

Net sales of short-term investments increased in the first nine months of 2013 compared to the same period in 2012 due to a significant amount of collateral returned to our counterparties associated with our securities lending program.

See Notes 4 and 5 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further information.

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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 $794.6 million in the first nine months of 2013, compared to $146.9 million in the same period of 2012.

The balance outstanding under our securities lending program decreased $315.3 million in the first nine months of 2013 and increased $146.0 million in the first nine months of 2012.

During the first quarter of 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured non-recourse notes issued by Tailwind Holdings for $56.2 million. Tailwind Holdings made principal payments of $7.5 million on these notes during the first nine months of 2012.

During the first nine months of 2013 and 2012, Northwind Holdings made principal payments of $45.0 million and $38.1 million, respectively, on its senior secured non-recourse notes.

During the third quarter of 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 the first nine months of 2013 and 2012, we repurchased 9.8 million and 18.6 million shares of Unum Group's common stock at a cost of $268.5 million and $400.5 million, respectively. Approximately $3.9 million of the amount repurchased during December 2012 was settled in January 2013.

During the first nine months of 2013 and 2012, we paid dividends of $108.8 million and $98.1 million, respectively, to holders of Unum Group's common stock.

See "Debt" contained in this Item 2, and Notes 9 and 11 of the "Notes to Consolidated Financial Statements" contained herein in Item 1, for further information.

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 its insurance subsidiaries is generally further limited to the amount of unassigned statutory surplus.

Unum Group and/or certain of its intermediate holding company subsidiaries may also receive dividends from its U.K.-based affiliate, Unum Limited, subject to applicable insurance company regulations and capital guidance in the U.K.

Northwind Holdings' ability to meet its debt payment obligations is dependent upon the receipt of dividends from Northwind Reinsurance Company (Northwind Re). The ability of Northwind Re and Tailwind Reinsurance Company (Tailwind Re) 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 and Tailwind Re.

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

The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries generally depends on the level of earnings of those insurance subsidiaries and additional factors such as RBC ratios and capital adequacy requirements in the U.K., funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. 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. We intend to retain a level of capital

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in our traditional U.S. insurance subsidiaries such that we maintain a weighted average RBC level above capital adequacy requirements. Effective April 1, 2013, the U.K. government abolished the Financial Services Authority (FSA). Capital adequacy requirements and minimum solvency margins for companies domiciled in the U.K. are now governed by the Prudential Regulation Authority (PRA). We do not anticipate that requirements under the PRA will differ materially from those under the FSA and expect Unum Limited to operate above PRA capital adequacy requirements and minimum solvency margins.

Debt

At September 30, 2013, we had short-term debt of $140.5 million, consisting entirely of securities lending agreements, and long-term debt of $2,631.3 million, consisting primarily of senior secured notes and junior subordinated debt securities.

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. 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. At September 30, 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. Our credit facility contains financial covenants 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. Any actions that we may take will be consistent with our stated capital management strategy.

We monitor our compliance with our debt covenants.  There are no significant financial covenants associated with any of our outstanding debt obligations.  We remain in compliance with all debt covenants and have not observed any current trends that would cause a breach of any debt covenants. See Note 11 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 and "Debt" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012 for further discussion.

Commitments

At September 30, 2013, we had legally binding unfunded commitments of $41.9 million and $3.7 million, which are recognized as liabilities in our consolidated balance sheets, to fund tax credit partnership investments and transferable state tax credits, respectively, with a corresponding recognition of other long-term investments and other assets, respectively. In addition, we had non-binding commitments of $44.2 million to fund certain investments in private placement fixed maturity securities, $120.5 million to fund certain private equity partnerships, and $61.6 million to fund certain commercial mortgage loans. These amounts may or may not be funded.

With respect to our commitments and off-balance sheet arrangements, see the discussion under “Commitments” in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012. During the first nine months of 2013, there were no substantive changes in our commitments, contractual obligations, or other off-balance sheet arrangements other than the changes in outstanding long-term and short-term debt and changes to our defined benefit pension plans as noted herein.

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.

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Our investment policy also 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 $140.5 million of securities lending agreements outstanding which were collateralized by cash at September 30, 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 first nine months of 2013 was $180.0 million, and the maximum amount outstanding at any month end was $292.3 million. In addition, at September 30, 2013, we had $124.1 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 first nine months of 2013 was $46.8 million, and the maximum amount outstanding at any month end was $124.1 million.

We had no repurchase agreements outstanding at September 30, 2013, nor did we utilize any repurchase agreements during the first nine months of 2013. 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.

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. 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.

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.

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On January 30, 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 outlook for all ratings is "stable."

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

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 our annual report on Form 10-K for the year ended December 31, 2012 for further information regarding our debt and financial strength ratings and the risks associated with rating changes.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to various market risk exposures including interest rate risk and foreign exchange rate risk. With respect to our exposure to market risk, see the discussion under "Investments" in Item 2 of this Form 10-Q and in Part II, Item 7A of our annual report on Form 10-K for the year ended December 31, 2012. During the first nine months of 2013, there was no substantive change to our market risk or the management of this risk.

ITEM 4. 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 quarterly report. We evaluated those controls based on the 1992 Integrated Internal Control 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 September 30, 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 September 30, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Refer to Part I, Item 1, Note 10 of the "Notes to Consolidated Financial Statements" for information on legal proceedings.

ITEM 1A. RISK FACTORS

There have been no material changes from the risk factors disclosed in our annual report on Form 10-K for the year ended December 31, 2012.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table provides information about our share repurchase activity for the third 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)
July 1 - July 31, 2013	—	$	—	—	$	356,599,590
August 1 - August 31, 2013	1,865,900	29.72		1,865,900	301,140,474
September 1 - September 30, 2013	641,300	30.47		641,300	281,597,142
Total	2,507,200			2,507,200

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

(2) In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock through January 2014.

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ITEM 6. EXHIBITS

Index to Exhibits

Exhibit 10.1 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 Unum Group’s Form 8-K filed on August 30, 2013).

Exhibit 15 Letter re: Unaudited Interim Financial Information.

Exhibit 31.1 Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.2 Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 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.

Exhibit 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.

Exhibit 101 The following financial statements from Unum Group's Quarterly Report on Form 10-Q for the quarter ended September 30, 2013, filed on November 5, 2013, 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.

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SIGNATURES

Pursuant to the requirements 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)
Date: November 5, 2013	By:	/s/ Thomas R. Watjen
		Thomas R. Watjen
		President and Chief Executive Officer
Date: November 5, 2013	By:	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and Chief Financial Officer

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EX-15

EXHIBIT 15

LETTER RE: UNAUDITED INTERIM FINANCIAL INFORMATION

Board of Directors and Stockholders

Unum Group

We are aware of 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 report dated November 5, 2013 relating to the unaudited consolidated interim financial statements of Unum Group and subsidiaries that are included in this Form 10-Q for the quarter ended September 30, 2013.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 5, 2013

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Thomas R. Watjen, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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: November 5, 2013	/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 quarterly report on Form 10-Q 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: November 5, 2013	/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 Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 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: November 5, 2013	/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 Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 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: November 5, 2013	/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.

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Stockholders' Equity and Earnings Per Common Share

9 Months Ended

Sep. 30, 2013

Disclosure Text Block [Abstract]

Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.7	$	230.2	$	636.9	$	660.5
Denominator (000s)
Weighted Average Common Shares - Basic	262,945.9		278,354.4		265,932.6		284,012.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,314.1		156.6		1,161.1		478.4
Weighted Average Common Shares - Assuming Dilution	264,260.0		278,511.0		267,093.7		284,491.2
Net Income Per Common Share
Basic	$	0.78	$	0.83	$	2.39	$	2.33
Assuming Dilution	$	0.78	$	0.83	$	2.38	$	2.32

We use the treasury stock method to account for the effect of outstanding stock options, nonvested stock awards, and performance restricted stock units on the computation of dilutive 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 stock awards and the performance restricted stock units.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $19.38 to $32.35, and the performance restricted stock units have a grant price of $23.97.

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 current market prices, approximated 0.1 million shares of common stock for the nine month period ended September 30, 2013, and 2.8 million and 2.4 million shares of common stock for the three and nine month periods ended September 30, 2012, respectively. There were no potential common shares that were antidilutive for the three month period ended September 30, 2013.

In July 2012 and February 2011, our board of directors authorized the repurchase of up to $750.0 million and $1.0 billion, respectively, of Unum Group's common stock. At December 31, 2012, no amounts remained for the purchase of shares under the February 2011 repurchase program. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $281.6 million at September 30, 2013.

Common stock repurchases, which are classified as treasury stock and accounted for using the cost method, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions)
Shares Repurchased	2.5		5.1		9.8		18.6
Cost of Shares Repurchased (1)	$	75.0	$	100.2	$	268.5	$	400.5

(1) Includes commissions of $0.1 million for the nine month period ended September 30, 2013 and $0.1 million and $0.4 million for the three and nine month periods ended September 30, 2012, respectively.

For the year ended December 31, 2012, we repurchased 23.6 million shares at a cost of $500.6 million, including commissions of $0.6 million.

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.

XML

Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Credit Exposure on Derivatives	$ 0.4		$ 0.4			$ 8.7
Cash collateral from counterparties	1.3		1.3			0
Carrying value of fixed maturity securities posted as collateral to our counterparties	91.5		91.5			108.6
Cash Collateral to counterparties	0		0			1.8
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	142.9		142.9			170.5
Notional amount of forward starting interest rate swaps to hedge anticipated purchase of long-term bonds	35.0		35.0			150.0
Notional amount of foreign currency cash flow hedges	481.1		481.1			508.8
Gain on Cash Flow Hedge Ineffectiveness	0	0	0	0
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness	0	0	0	0
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months			45.7
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net	0	0	0	0
Derivative, Notional Amount	1,336.1	1,513.2	1,336.1	1,513.2	1,403.7	1,432.8	1,309.5	1,413.0
Options Held on U.S. Treasury Rates
Derivative [Line Items]
Derivative, Notional Amount	0	0	0	0	10.0	0	0	0
Fair Value Hedging [Member]
Derivative [Line Items]
Gain (Loss) on Fair Value Hedge Ineffectiveness	0	0	0	0
Gain (Loss) from Hedged Firm Commitment Not Qualifying as Fair Value Hedge, Net			0
Receive Variable/Pay Fixed | Swaps
Derivative [Line Items]
Notional Amount of Interest Rate Fair Value Hedge Derivatives	150.0		150.0			174.0
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(2.9)	0.2	(9.7)	0.4
Derivative, Notional Amount	150.0	174.0	150.0	174.0	174.0	174.0	174.0	174.0
Receive Fixed/Pay Variable | Swaps
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(1.8)	(4.1)	17.3	(8.3)
Notional Amount of Fair Value Hedge Instruments	600.0		600.0			600.0
Derivative, Notional Amount	635.0	800.0	635.0	800.0	675.0	750.0	595.0	685.0
Credit Default Swaps
Derivative [Line Items]
Derivative, Notional Amount	70.0		70.0			0
Credit Default Swaps | Swaps
Derivative [Line Items]
Derivative, Notional Amount	$ 70.0	$ 0	$ 70.0	$ 0	$ 70.0	$ 0	$ 0	$ 0

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue
Premium Income	$ 1,897.3	$ 1,929.4	$ 5,734.0	$ 5,778.9
Net Investment Income	615.5	619.2	1,862.7	1,872.2
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	0	0	(0.8)	0
Other Net Realized Investment Gain (Loss)	(26.1)	21.3	(1.7)	31.6
Net Realized Investment Gain (Loss)	(26.1)	21.3	(2.5)	31.6
Other Income	54.2	58.1	173.4	174.5
Total Revenue	2,540.9	2,628.0	7,767.6	7,857.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,641.6	1,686.9	4,951.9	5,033.0
Commissions	222.6	227.7	681.6	690.8
Interest and Debt Expense	37.4	36.6	111.8	107.3
Deferral of Acquisition Costs	(117.8)	(111.0)	(349.3)	(347.6)
Amortization of Deferred Acquisition Costs	98.6	87.0	323.7	285.6
Compensation Expense	196.2	187.0	588.7	589.3
Other Expenses	178.2	193.4	559.8	572.0
Total Benefits and Expenses	2,256.8	2,307.6	6,868.2	6,930.4
Income Before Income Tax	284.1	320.4	899.4	926.8
Income Tax (Benefit)
Current	69.4	85.5	263.4	126.4
Deferred	9.0	4.7	(0.9)	139.9
Total Income Tax	78.4	90.2	262.5	266.3
Net Income	$ 205.7	$ 230.2	$ 636.9	$ 660.5
Net Income Per Common Share
Basic	$ 0.78	$ 0.83	$ 2.39	$ 2.33
Diluted	$ 0.78	$ 0.83	$ 2.38	$ 2.32

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Basis of Presentation

9 Months Ended

Sep. 30, 2013

Basis of Presentation [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) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2012.

In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance.

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Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 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 June 30, 2013		$	295.6		$	405.5		$	(141.6	)	$	(342.8	)	$	216.7
	Other Comprehensive Income (Loss) Before Reclassifications	113.9			(3.2		)	68.2			2.9			181.8
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	17.9			(5.1		)	—			(1.7		)	11.1
	Net Other Comprehensive Income (Loss)	131.8			(8.3		)	68.2			1.2			192.9
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(452.5		)	4.3			(0.8		)	217.7			(231.3		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	6.4			(8.7		)	—			15.2			12.9
	Net Other Comprehensive Income (Loss)	(446.1		)	(4.4		)	(0.8		)	232.9			(218.4		)
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6

Schedule of Net Unrealized Gain on Securities

The net unrealized gain on securities consists of the following components:

										Change at September 30, 2013
	September 30			June 30			December 31			Three Months			Nine Months
	2013			2013			2012			Ended			Ended
	(in millions of dollars)
Fixed Maturity Securities	$	4,410.4		$	4,659.6		$	7,221.5		$	(249.2	)	$	(2,811.1	)
Other Investments	65.2			57.1			92.8			8.1			(27.6		)
Deferred Acquisition Costs	(42.8		)	(43.8		)	(67.0		)	1.0			24.2
Reserves for Future Policy and Contract Benefits	(4,037.6		)	(4,498.1		)	(6,277.5		)	460.5			2,239.9
Reinsurance Recoverable	275.0			283.6			351.5			(8.6		)	(76.5		)
Deferred Income Tax	(242.8		)	(162.8		)	(447.8		)	(80.0		)	205.0
Total	$	427.4		$	295.6		$	873.5		$	131.8		$	(446.1	)

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:

			September 30, 2013
			Three Months			Nine Months
			Ended			Ended
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(27.5	)	$	(9.1	)
		Other-Than-Temporary Impairment Loss	—			(0.8		)
			(27.5		)	(9.9		)
	Income Tax Benefit		(9.6		)	(3.5		)
	Total		$	(17.9	)	$	(6.4	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	11.1		$	32.2
		Loss on Foreign Exchange Contracts	(1.4		)	(4.6		)
	Net Realized Investment Gain (Loss)
		Gain (Loss) on Interest Rate Swaps	(0.1		)	0.7
		Loss on Foreign Exchange Contracts	(1.3		)	(13.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)	(1.2		)
			7.9			13.4
	Income Tax Expense		2.8			4.7
	Total		$	5.1		$	8.7
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(2.7	)	$	(30.5	)
		Amortization of Prior Service Credit	1.1			3.6
		Curtailment Gain	3.7			3.0
			2.1			(23.9		)
	Income Tax Expense (Benefit)		0.4			(8.7		)
	Total		$	1.7		$	(15.2	)

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Other - Additional Information Domain (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 01, 2015	Apr. 01, 2014	Sep. 30, 2013 Minimum	Sep. 30, 2012 Minimum	Sep. 30, 2013 Northwind Holdings LLC [Member]	Sep. 30, 2013 Tailwind Holdings LLC [Member]	Mar. 31, 2012 Prior to UK Tax Rate Change [Member] Rate	Mar. 31, 2012 After UK Tax Rate Change [Member] Rate
Debt Instrument, Periodic Payment, Principal									$ 45.0
Repayments of Long-term Debt			101.2	45.6						62.5
Gains (Losses) on Extinguishment of Debt										4.0
Line of Credit Facility, term	five
Line of Credit Facility, Maximum Borrowing Capacity	400.0		400.0
Line of Credit Facility, Amount Outstanding	0		0
Unrecognized Tax Benefits	21.5		21.5
Unrecognized Tax Benefits That Would Not Effect Tax Rate	15.0		15.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.1	0.1	0.3	(10.5)
2013 UK Tax rate	23.00%		23.00%
2014 UK Tax Rate						21.00%
2015 UK Tax Rate					20.00%
2012 UK tax rate											25.00%	24.00%
Income Tax Reconciliation, Change in Enacted Tax Rate							$ 6.3	$ 9.3

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Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassifications from Accumulated Other Comprehensive Income to Income [Line Items]
Income Tax Expense (Benefit)	$ 78.4	$ 90.2	$ 262.5	$ 266.3
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	7.9		13.4
Cash Flow Hedge Gain (Loss) Reclassified to Earnings	5.1		8.7
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	(27.5)		(9.9)
Reclassification on Sale of Securities from Other Comprehensive Income to Net Income, Net of Tax	(17.9)		(6.4)
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	2.1		(23.9)
Reclassification of Gain (Loss) on Pension and Other Postretirement Benefit Plans from Other Comprehensive Income to Net Income, Net of Tax	1.7		(15.2)
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	(27.5)		(9.1)
Other than Temporary Impairment Losses	0		(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	(0.1)		0.7
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	(1.3)		(13.7)
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	11.1		32.2
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	(1.4)		(4.6)
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	(0.4)		(1.2)
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	(2.7)		(30.5)
Amortization of Prior Service Credit	1.1		3.6
Curtailment Gain	3.7		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)	2.8		4.7
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)	(9.6)		(3.5)
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)	$ 0.4		$ (8.7)

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Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2013

Notes to Financial Statements [Abstract]

Commitments and Contingent Liabilities

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.

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 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 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 the court’s 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.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 33 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination.

In July 2011, the New York State Department of Financial Services issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate.

It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York State Department of Financial Services' letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

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 allege 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 seek to examine company records and assess penalties and costs in an undetermined amount. In April 2013, we filed motions to dismiss both complaints. The motions were heard in September 2013, and we are awaiting a ruling from the court.

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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Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Credit Default Swaps	Dec. 31, 2012 Credit Default Swaps	Sep. 30, 2013 Swaps Receive Variable/Pay Fixed	Sep. 30, 2012 Swaps Receive Variable/Pay Fixed	Sep. 30, 2013 Swaps Receive Variable/Pay Fixed	Sep. 30, 2012 Swaps Receive Variable/Pay Fixed	Sep. 30, 2013 Swaps Receive Fixed/Pay Fixed	Sep. 30, 2012 Swaps Receive Fixed/Pay Fixed	Sep. 30, 2013 Swaps Receive Fixed/Pay Fixed	Sep. 30, 2012 Swaps Receive Fixed/Pay Fixed	Sep. 30, 2013 Swaps Receive Fixed/Pay Variable	Sep. 30, 2012 Swaps Receive Fixed/Pay Variable	Sep. 30, 2013 Swaps Receive Fixed/Pay Variable	Sep. 30, 2012 Swaps Receive Fixed/Pay Variable	Sep. 30, 2013 Swaps Credit Default Swaps	Sep. 30, 2012 Swaps Credit Default Swaps	Sep. 30, 2013 Swaps Credit Default Swaps	Sep. 30, 2012 Swaps Credit Default Swaps	Sep. 30, 2013 Forwards	Sep. 30, 2012 Forwards	Sep. 30, 2013 Forwards	Sep. 30, 2012 Forwards	Sep. 30, 2013 Options Held	Sep. 30, 2012 Options Held	Sep. 30, 2013 Options Held	Sep. 30, 2012 Options Held
Derivative [Line Items]
Balance at beginning of period	$ 1,403.7	$ 1,309.5	$ 1,432.8	$ 1,413.0	$ 70.0	$ 0	$ 174.0	$ 174.0	$ 174.0	$ 174.0	$ 474.7	$ 540.5	$ 508.8	$ 554.0	$ 675.0	$ 595.0	$ 750.0	$ 685.0	$ 70.0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 10.0	$ 0	$ 0	$ 0
Additions	10.0	275.0	114.0	331.0			0	0	0	0	10.0	0	10.0	0	0	250.0	0	250.0	0	0	70.0	0	0	25.0	24.0	81.0	0	0	10.0	0
Terminations	77.6	71.3	210.7	230.8			24.0	0	24.0	0	3.6	26.3	37.7	39.8	40.0	45.0	115.0	135.0	0	0	0	0	0	0	24.0	56.0	10.0	0	10.0	0
Balance at ending of period	$ 1,336.1	$ 1,513.2	$ 1,336.1	$ 1,513.2	$ 70.0	$ 0	$ 150.0	$ 174.0	$ 150.0	$ 174.0	$ 481.1	$ 514.2	$ 481.1	$ 514.2	$ 635.0	$ 800.0	$ 635.0	$ 800.0	$ 70.0	$ 0	$ 70.0	$ 0	$ 0	$ 25.0	$ 0	$ 25.0	$ 0	$ 0	$ 0	$ 0

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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,897.3	$ 1,929.4	$ 5,734.0	$ 5,778.9
Unum U.S.
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,124.6	1,111.9	3,395.8	3,338.9
Unum U.S. | Group Long-term Disability - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	385.0	392.4	1,172.5	1,185.7
Unum U.S. | Group Short-term Disability - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	129.5	120.1	389.6	356.0
Unum U.S. | Group Life - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	305.2	297.3	911.0	885.1
Unum U.S. | Accidental Death & Dismemberment - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	30.5	29.2	91.6	86.2
Unum U.S. | Individual Disability-Recently Issued - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	114.9	119.9	349.3	357.0
Unum U.S. | Voluntary Benefits - US
Segment Reporting Information [Line Items]
Premiums Earned, Net	159.5	153.0	481.8	468.9
Unum U.K.
Segment Reporting Information [Line Items]
Premiums Earned, Net	137.3	175.2	418.7	519.1
Unum U.K. | Group Long term Disability - UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	96.5	102.9	290.7	306.5
Unum U.K. | Group Life - UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	25.6	56.4	83.1	164.6
Unum U.K. | Supplemental and Voluntary - UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	15.2	15.9	44.9	48.0
Colonial Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	309.1	299.4	924.1	892.6
Colonial Life | Accident, Sickness, and Disability - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	185.0	181.8	554.5	541.8
Colonial Life | Life - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	55.6	52.2	165.7	156.3
Colonial Life | Cancer and Critical Illness - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	68.5	65.4	203.9	194.5
Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	326.3	342.9	995.4	1,028.3
Closed Block | Individual Disability - Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	169.3	183.1	521.7	554.9
Closed Block | Long-term Care - Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	157.0	159.4	473.6	471.5
Closed Block | All Other - Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 0	$ 0.4	$ 0.1	$ 1.9

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Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,776.1	$ 1,712.7
Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	102.0	114.3
Percent of Total	5.70%	6.70%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	166.8	160.0
Percent of Total	9.40%	9.30%
East North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	241.0	224.7
Percent of Total	13.60%	13.10%
West North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	168.4	160.8
Percent of Total	9.50%	9.40%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	433.9	440.9
Percent of Total	24.40%	25.70%
East South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	68.2	79.6
Percent of Total	3.80%	4.70%
West South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	202.4	159.5
Percent of Total	11.40%	9.30%
Mountain
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	83.2	90.5
Percent of Total	4.70%	5.30%
Pacific
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 310.2	$ 282.4
Percent of Total	17.50%	16.50%

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Stockholders' Equity and Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share, Basic and Diluted [Abstract]

Net Income Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.7	$	230.2	$	636.9	$	660.5
Denominator (000s)
Weighted Average Common Shares - Basic	262,945.9		278,354.4		265,932.6		284,012.8
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,314.1		156.6		1,161.1		478.4
Weighted Average Common Shares - Assuming Dilution	264,260.0		278,511.0		267,093.7		284,491.2
Net Income Per Common Share
Basic	$	0.78	$	0.83	$	2.39	$	2.33
Assuming Dilution	$	0.78	$	0.83	$	2.38	$	2.32

Share Repurchase Table

Common stock repurchases, which are classified as treasury stock and accounted for using the cost method, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions)
Shares Repurchased	2.5		5.1		9.8		18.6
Cost of Shares Repurchased (1)	$	75.0	$	100.2	$	268.5	$	400.5

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit cost (credit) related to the Company's defined benefit pension and OPEB plans are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.8		$	12.2		$	1.0		$	1.2		$	0.2		$	0.4
Interest Cost	21.3			21.1			2.1			2.2			2.0			2.3
Expected Return on Plan Assets	(27.2		)	(22.2		)	(3.1		)	(2.8		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	2.3			11.5			0.4			0.1			—			—
Prior Service Cost (Credit)	0.1			(0.1		)	—			—			(1.2		)	(0.6		)
Curtailment Gain	—			—			(3.7		)	—			—			—
Total	$	11.3		$	22.5		$	(3.3	)	$	0.7		$	0.8		$	1.9

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	44.6		$	36.6		$	3.2		$	3.6		$	0.6		$	1.2
Interest Cost	65.0			63.3			6.3			6.4			6.0			7.1
Expected Return on Plan Assets	(78.5		)	(66.5		)	(9.1		)	(8.3		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	29.4			34.4			1.1			0.4			—			—
Prior Service Cost (Credit)	0.1			(0.4		)	—			—			(3.7		)	(1.9		)
Curtailment Loss (Gain)	0.7			—			(3.7		)	—			—			—
Total	$	61.3		$	67.4		$	(2.2	)	$	2.1		$	2.4		$	5.9

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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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fixed Maturity Securities
Gross Gains on Sales	$ 4.3	$ 4.6	$ 13.5	$ 14.0
Gross Losses on Sales	(33.0)	(2.3)	(40.1)	(9.0)
Other-Than-Temporary Impairment Loss	0	0	(0.8)	0
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	5.6	2.3	14.6	2.3
Impairment Loss	(1.0)	(1.3)	(2.0)	(1.8)
Gain (Loss) on Embedded Derivative	(0.3)	19.7	18.5	28.7
Derivative, Gain (Loss) on Derivative, Net	(1.0)	0	(1.5)	0
Foreign Currency Transactions	(0.7)	(1.7)	(4.7)	(2.6)
Net Realized Investment Gain (Loss)	$ (26.1)	$ 21.3	$ (2.5)	$ 31.6

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 38,187.2	$ 37,751.5
Gross Unrealized Gain	4,698.0	7,277.5
Gross Unrealized Loss	287.6	56.0
Fixed Maturity Securities	42,597.6	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	1,020.8	1,020.9
Gross Unrealized Gain	206.7	329.0
Gross Unrealized Loss	4.3	1.1
Fixed Maturity Securities	1,223.2	1,348.8
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,675.5	1,498.4
Gross Unrealized Gain	131.2	316.2
Gross Unrealized Loss	36.9	7.8
Fixed Maturity Securities	1,769.8	1,806.8
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,203.1	1,280.4
Gross Unrealized Gain	174.2	226.6
Gross Unrealized Loss	2.0	0
Fixed Maturity Securities	1,375.3	1,507.0
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,372.1	9,294.3
Gross Unrealized Gain	1,233.7	1,865.0
Gross Unrealized Loss	49.1	15.1
Fixed Maturity Securities	10,556.7	11,144.2
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,947.0	1,927.9
Gross Unrealized Gain	216.0	289.1
Gross Unrealized Loss	1.4	0.5
Fixed Maturity Securities	2,161.6	2,216.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	22,935.7	22,696.6
Gross Unrealized Gain	2,731.0	4,245.3
Gross Unrealized Loss	193.9	31.5
Fixed Maturity Securities	25,472.8	26,910.4
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	33.0	33.0
Gross Unrealized Gain	5.2	6.3
Gross Unrealized Loss	0	0
Fixed Maturity Securities	$ 38.2	$ 39.3

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,776.1	$ 1,712.7
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	771.8	624.7
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	816.0	858.8
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	121.9	142.5
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 66.4	$ 86.7

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Timing of Anticipated Settlements of Interest Rate Swaps Outstanding (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Value	$ 1,336.1	$ 1,403.7	$ 1,432.8	$ 1,513.2	$ 1,309.5	$ 1,413.0
Forecasted in 2013
Derivative [Line Items]
Notional Value	$ 35.0
Weighted Average Receive Rate	6.82%
Weighted Average pay rate	0.25%

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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	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
States, Municipalities, and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	$ (152.0)	$ 0	$ (128.7)	$ (68.1)
Investment Gain (Loss) included in Earnings	0	0	0	0
Investment Gain (Loss) included in OCI	(0.1)	2.0	(8.4)	(0.9)
Purchases	0	0	0	0
Sales	0	0	(0.5)	(0.3)
Level 3 Transfers Into	0	108.1	32.1	43.2
Level 3 Transfers Out of	0	0	0	0
End of Period	(151.9)	(110.1)	(151.9)	(110.1)
Foreign Governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(80.0)	0	(82.1)	0
Investment Gain (Loss) included in Earnings	0	0	0	0
Investment Gain (Loss) included in OCI	(1.4)	1.3	(3.5)	5.2
Purchases	0	0	0	0
Sales	0	0	0	0
Level 3 Transfers Into	0	44.8	0	40.9
Level 3 Transfers Out of	0	0	0	0
End of Period	(78.6)	(46.1)	(78.6)	(46.1)
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(354.2)	(162.8)	(574.4)	(338.9)
Investment Gain (Loss) included in Earnings	0	0	0	0
Investment Gain (Loss) included in OCI	(5.2)	8.4	(19.4)	5.4
Purchases	0	0	0	3.6
Sales	0	(1.7)	(3.6)	(3.7)
Level 3 Transfers Into	144.1	340.5	244.7	361.7
Level 3 Transfers Out of	(201.3)	(10.9)	(504.3)	(206.8)
End of Period	(291.8)	(499.1)	(291.8)	(499.1)
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(14.9)	(0.6)	(0.5)	(31.7)
Investment Gain (Loss) included in Earnings	(1.3)	0	0	0
Investment Gain (Loss) included in OCI	0.9	0.4	0.1	0.9
Purchases	0	0	0	7.0
Sales	(14.0)	0	(0.1)	(0.1)
Level 3 Transfers Into	0	7.4	0	0
Level 3 Transfers Out of	0	0	0	(31.1)
End of Period	(0.5)	(8.4)	(0.5)	(8.4)
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(1,042.5)	(639.6)	(1,177.8)	(665.5)
Investment Gain (Loss) included in Earnings	(1.0)	0	1.1	0
Investment Gain (Loss) included in OCI	(2.5)	19.8	(70.5)	34.0
Purchases	7.0	0	30.1	30.2
Sales	(23.0)	(5.3)	(86.9)	(49.0)
Level 3 Transfers Into	540.7	386.7	807.4	448.0
Level 3 Transfers Out of	(351.2)	(146.2)	(646.5)	(234.1)
End of Period	(1,212.5)	(894.6)	(1,212.5)	(894.6)
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(24.2)	(22.2)	(24.8)	(37.2)
Investment Gain (Loss) included in Earnings	0	0	0	(1.0)
Investment Gain (Loss) included in OCI	(0.1)	0	(0.7)	0.8
Purchases	0	0	0	0
Sales	0	0	0	(14.3)
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	(22.2)	0	(22.7)
End of Period	(24.1)	0	(24.1)	0
Total Fixed Maturity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(1,667.8)	(825.2)	(1,988.3)	(1,141.4)
Investment Gain (Loss) included in Earnings	(2.3)	0	1.1	(1.0)
Investment Gain (Loss) included in OCI	(8.4)	31.9	(102.4)	45.4
Purchases	7.0	0	30.1	40.8
Sales	(37.0)	(7.0)	(91.1)	(67.4)
Level 3 Transfers Into	684.8	887.5	1,084.2	893.8
Level 3 Transfers Out of	(552.5)	(179.3)	(1,150.8)	(494.7)
End of Period	(1,759.4)	(1,558.3)	(1,759.4)	(1,558.3)
Equity Securites
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(4.4)	(4.4)	(4.3)	(11.2)
Investment Gain (Loss) included in Earnings	0	0	0	0
Investment Gain (Loss) included in OCI	0	0	0.1	0
Purchases	0	0	0	0
Sales	0	0	0	(0.1)
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	0	0	(6.7)
End of Period	(4.4)	(4.4)	(4.4)	(4.4)
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	65.1	126.7	(83.9)	(135.7)
Investment Gain (Loss) included in Earnings	(0.3)	19.7	18.5	28.7
Investment Gain (Loss) included in OCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	0	0	0
End of Period	$ (65.4)	$ (107.0)	$ (65.4)	$ (107.0)

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Stockholders' Equity and Earnings Per Common Share Share Repurchases (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Share Repurchase Table [Line Items]
Treasury Stock, Shares, Acquired	2.5	5.1	9.8	18.6	23.6
Treasury Stock, Value, Acquired, Cost Method	$ 75.0	$ 100.2	$ 268.5	$ 400.5	$ 500.6

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Net Income Per Common Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator
Net Income	$ 205.7	$ 230.2	$ 636.9	$ 660.5
Denominator (000s)
Weighted Average Common Shares - Basic	262,945,900	278,354,400	265,932,600	284,012,800
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,314,100	156,600	1,161,100	478,400
Weighted Average Common Shares - Assuming Dilution	264,260,000	278,511,000	267,093,700	284,491,200
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.78	$ 0.83	$ 2.39	$ 2.33
Earnings Per Share, Diluted	$ 0.78	$ 0.83	$ 2.38	$ 2.32
Retained Earnings
Numerator
Net Income	$ 205.7	$ 230.2	$ 636.9	$ 660.5

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Investments Mortgage Loan Restructuring (Detail) (9 months ended [Domain], Commercial Real Estate Portfolio Segment [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
9 months ended [Domain] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 4.3	$ 13.1
Number of Trouble Debt Modifications Entered Into During Period	1	2

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

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:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	385.0	$	392.4	$	1,172.5	$	1,185.7
Group Short-term Disability	129.5		120.1		389.6		356.0
Group Life and Accidental Death & Dismemberment
Group Life	305.2		297.3		911.0		885.1
Accidental Death & Dismemberment	30.5		29.2		91.6		86.2
Supplemental and Voluntary
Individual Disability - Recently Issued	114.9		119.9		349.3		357.0
Voluntary Benefits	159.5		153.0		481.8		468.9
	1,124.6		1,111.9		3,395.8		3,338.9
Unum UK
Group Long-term Disability	96.5		102.9		290.7		306.5
Group Life	25.6		56.4		83.1		164.6
Supplemental and Voluntary	15.2		15.9		44.9		48.0
	137.3		175.2		418.7		519.1
Colonial Life
Accident, Sickness, and Disability	185.0		181.8		554.5		541.8
Life	55.6		52.2		165.7		156.3
Cancer and Critical Illness	68.5		65.4		203.9		194.5
	309.1		299.4		924.1		892.6
Closed Block
Individual Disability	169.3		183.1		521.7		554.9
Long-term Care	157.0		159.4		473.6		471.5
All Other	—		0.4		0.1		1.9
	326.3		342.9		995.4		1,028.3
Total	$	1,897.3	$	1,929.4	$	5,734.0	$	5,778.9

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)
Three Months Ended September 30, 2013
Premium Income	$	1,124.6	$	137.3	$	309.1	$	326.3	$	—		$	1,897.3
Net Investment Income	233.1		30.3		36.3		315.4		0.4			615.5
Other Income	30.2		0.1		—		23.6		0.3			54.2
Operating Revenue	$	1,387.9	$	167.7	$	345.4	$	665.3	$	0.7		$	2,567.0
Operating Income (Loss)	$	219.8	$	31.3	$	69.0	$	25.7	$	(32.9	)	$	312.9
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Nine Months Ended September 30, 2013
Premium Income	$	3,395.8	$	418.7	$	924.1	$	995.4	$	—		$	5,734.0
Net Investment Income	699.9		106.5		110.3		944.6		1.4			1,862.7
Other Income	99.0		0.1		0.1		71.5		2.7			173.4
Operating Revenue	$	4,194.7	$	525.3	$	1,034.5	$	2,011.5	$	4.1		$	7,770.1
Operating Income (Loss)	$	641.9	$	96.1	$	215.5	$	82.6	$	(103.7	)	$	932.4
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0

Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income is presented as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,567.0		$	2,606.7		$	7,770.1		$	7,825.6
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Total Revenue	$	2,540.9		$	2,628.0		$	7,767.6		$	7,857.2
Operating Income by Segment	$	312.9		$	310.7		$	932.4		$	930.0
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Non-operating Retirement-related Loss	(2.7		)	(11.6		)	(30.5		)	(34.8		)
Income Tax	(78.4		)	(90.2		)	(262.5		)	(266.3		)
Net Income	$	205.7		$	230.2		$	636.9		$	660.5

Assets by Segment

Assets by segment are as follows:

	September 30		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,569.7	$	19,391.2
Unum UK	3,690.1		3,975.8
Colonial Life	3,435.4		3,434.9
Closed Block	31,651.2		33,069.2
Corporate	2,239.4		2,365.0
Total	$	59,585.8	$	62,236.1

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Change in Net Unrealized Gain on Securities Before Adjustment, Tax Expense (Benefit)	$ (89.8)	$ 301.7	$ (983.8)	$ 494.5
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance, Tax Expense (Benefit)	169.8	(213.5)	778.8	(344.0)
Change in Net Gain on Cash Flow Hedges, Tax Expense	(5.2)	(6.0)	(1.9)	(5.3)
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	$ 0.5	$ 3.5	$ 124.9	$ 11.0

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Retained Earnings
Dividends to Stockholders, per common share	$ 0.405	$ 0.340

XML

Fair Values of Financial Instruments

9 Months Ended

Sep. 30, 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.

	September 30, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,597.6	$	42,597.6	$	44,973.0	$	44,973.0
Mortgage Loans	1,776.1		1,967.8		1,712.7		1,937.1
Policy Loans	3,242.5		3,312.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	24.5		24.5		81.6		81.6
Equity Securities	15.5		15.5		14.6		14.6
Miscellaneous Long-term Investments	465.4		465.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	634.2	$	634.2	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	554.2		554.2		535.5		535.5
Long-term Debt	2,631.3		2,827.5		2,755.4		2,968.8
Other Liabilities
Derivatives	142.9		142.9		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	65.4		65.4		83.9		83.9
Unfunded Commitments to Investment Partnerships	41.9		41.9		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 $3,014.3 million and $2,912.7 million as of September 30, 2013 and December 31, 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 valuations provided by the general partner in the partnerships' financial statements. 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 $2,163.9 million and $1,212.0 million as of September 30, 2013 and December 31, 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 $663.0 million and $1,756.8 million as of September 30, 2013 and December 31, 2012, respectively, and are assigned a Level 2. Debt instruments which are valued based on unobservable inputs that represent our assumptions about what a market participant would use in pricing the liability have a fair value of $0.6 million at September 30, 2013 and are assigned a Level 3. No debt instruments were valued using Level 3 inputs at December 31, 2012.

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 September 30, 2013, approximately 10.3 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 89.7 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 73.0 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 3.7 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 13.0 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:

	September 30, 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	$	135.1	$	1,088.1	$	—	$	1,223.2
States, Municipalities, and Political Subdivisions	—		1,617.9		151.9		1,769.8
Foreign Governments	—		1,296.7		78.6		1,375.3
Public Utilities	692.0		9,572.9		291.8		10,556.7
Mortgage/Asset-Backed Securities	—		2,161.1		0.5		2,161.6
All Other Corporate Bonds	3,541.4		20,718.9		1,212.5		25,472.8
Redeemable Preferred Stocks	—		14.1		24.1		38.2
Total Fixed Maturity Securities	4,368.5		36,469.7		1,759.4		42,597.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		22.5		—		22.5
Foreign Exchange Contracts	—		2.0		—		2.0
Total Derivatives	—		24.5		—		24.5
Equity Securities	—		11.1		4.4		15.5
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.8	$	—	$	33.8
Foreign Exchange Contracts	—		107.6		—		107.6
Credit Default Swaps	—		1.5		—		1.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		65.4		65.4
Total Derivatives	—		142.9		65.4		208.3

	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:

	Three Months Ended September 30
	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	$	21.7	$	164.6	$	426.8	$	60.5
States, Municipalities, and Political Subdivisions	—		31.8		43.0		62.9
Foreign Governments	—		—		21.7		—
Public Utilities	367.1		584.7		382.4		743.6
All Other Corporate Bonds	1,406.9		2,884.6		2,152.9		1,667.4
Total Fixed Maturity Securities	$	1,795.7	$	3,665.7	$	3,026.8	$	2,534.4
Equity Securities	$	—	$	—	$	—	$	7.4
	Nine Months Ended September 30
	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	$	48.0	$	—	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	—		53.1		41.9		74.8
Foreign Governments	—		—		20.7		—
Public Utilities	577.9		53.5		479.0		483.6
All Other Corporate Bonds	2,536.4		992.2		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,162.3	$	1,098.8	$	3,570.8	$	2,284.9

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:

	Three Months Ended September 30, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	152.0		$	—		$	(0.1	)	$	—	$	—		$	—	$	—		$	151.9
Foreign Governments	80.0			—			(1.4		)	—		—			—		—			78.6
Public Utilities	354.2			—			(5.2		)	—		—			144.1		(201.3		)	291.8
Mortgage/Asset-Backed Securities	14.9			(1.3		)	0.9			—		(14.0		)	—		—			0.5
All Other Corporate Bonds	1,042.5			(1.0		)	(2.5		)	7.0		(23.0		)	540.7		(351.2		)	1,212.5
Redeemable Preferred Stocks	24.2			—			(0.1		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,667.8			(2.3		)	(8.4		)	7.0		(37.0		)	684.8		(552.5		)	1,759.4
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(65.1		)	(0.3		)	—			—		—			—		—			(65.4		)
	Three Months Ended September 30, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)

	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(8.4	)	$	—	$	(0.5	)	$	32.1	$	—		$	151.9
Foreign Governments	82.1			—			(3.5		)	—		—			—		—			78.6
Public Utilities	574.4			—			(19.4		)	—		(3.6		)	244.7		(504.3		)	291.8
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(70.5		)	30.1		(86.9		)	807.4		(646.5		)	1,212.5
Redeemable Preferred Stocks	24.8			—			(0.7		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,988.3			1.1			(102.4		)	30.1		(91.1		)	1,084.2		(1,150.8		)	1,759.4
Equity Securities	4.3			—			0.1			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	18.5			—			—		—			—		—			(65.4		)
	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)

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. Gains and losses 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 period end were $(0.3) million and $18.5 million for the three and nine months ended September 30, 2013, respectively, and $19.7 million and $28.7 million for the three and nine months ended September 30, 2012, 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:

	September 30, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	118.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	66.5			- Volatility of Credit	(e)	0.50% - 0.75% / 0.59%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.23% - 5.33% / 5.31%
All Other Corporate Bonds - Private	234.2			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	2.71% - 2.71% / 2.71% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.20% - 4.00% / 0.97% Priced at Par
All Other Corporate Bonds - Public	228.8			- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	(0.62)% - 1.00% / 0.27% 0.20% - 0.25% / 0.21% (0.84)% - 0.75% / (0.29)%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(65.4		)	- 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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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities
Net Income	$ 636.9	$ 660.5
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(225.7)	9.0
Change in Deferred Acquisition Costs	(25.6)	(62.0)
Change in Insurance Reserves and Liabilities	465.5	333.8
Change in Income Taxes	(81.9)	151.9
Change in Other Accrued Liabilities	12.5	(24.4)
Non-cash Adjustments to Net Investment Income	(143.2)	(160.7)
Net Realized Investment (Gain) Loss	2.5	(31.6)
Depreciation	63.4	63.5
Other, Net	5.1	13.8
Net Cash Provided by Operating Activities	709.5	953.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	877.0	401.2
Proceeds from Maturities of Fixed Maturity Securities	1,632.5	1,583.6
Proceeds from Sales and Maturities of Other Investments	166.5	112.6
Purchase of Fixed Maturity Securities	(2,808.5)	(2,479.6)
Purchase of Other Investments	(242.4)	(219.4)
Net Sales (Purchases) of Short-term Investments	522.7	(194.6)
Other, Net	(77.0)	(73.7)
Net Cash Provided (Used) by Investing Activities	70.8	(869.9)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(315.3)	146.0
Issuance of Long-term Debt	0	246.4
Long-term Debt Repayments	(101.2)	(45.6)
Issuance of Common Stock	4.3	4.2
Repurchase of Common Stock	(272.4)	(400.5)
Dividends Paid to Stockholders	(108.8)	(98.1)
Other, Net	(1.2)	0.7
Net Cash Used by Financing Activities	(794.6)	(146.9)
Net Decrease in Cash and Bank Deposits	(14.3)	(63.0)
Cash and Bank Deposits at Beginning of Year	77.3	116.6
Cash and Bank Deposits at End of Period	$ 63.0	$ 53.6

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Activity in Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year	$ 1.5	$ 1.5	$ 1.5	$ 1.5
Provisions	0	1.3	0	1.8
Charge-offs, Net of Recoveries	0	0	0	(0.5)
Balance at End of Period	$ 1.5	$ 2.8	$ 1.5	$ 2.8

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Mortgage Loans	$ 1,776.1	$ 1,712.7
Policy Loans	3,242.5	3,133.8
Other Long Term Investments
Equity Securities	15.5	14.6
Derivatives	24.5	81.6
Policyholders' Funds
Long-term Debt	2,631.3	2,755.4
Other Liabilities
Derivatives	208.3	254.4
Unfunded commitment to fund Investment Partnerships	41.9
Carrying Amount
Assets
Fixed Maturity Securities	42,597.6	44,973.0
Mortgage Loans	1,776.1	1,712.7
Policy Loans	3,242.5	3,133.8
Other Long Term Investments
Equity Securities	15.5	14.6
Miscellaneous Long-Term Investments	465.4	455.1
Derivatives	24.5	81.6
Policyholders' Funds
Deferred Annuity Products	634.2	640.1
Supplementary Contracts without Life Contingencies	554.2	535.5
Long-term Debt	2,631.3	2,755.4
Other Liabilities
Derivatives	142.9	170.5
Embedded Derivative in Modified Coinsurance Arrangement	65.4	83.9
Unfunded commitment to fund Investment Partnerships	41.9	83.7
Fair Value
Assets
Fixed Maturity Securities	42,597.6	44,973.0
Mortgage Loans	1,967.8	1,937.1
Policy Loans	3,312.7	3,215.3
Other Long Term Investments
Equity Securities	15.5	14.6
Miscellaneous Long-Term Investments	465.4	455.1
Derivatives	24.5	81.6
Policyholders' Funds
Deferred Annuity Products	634.2	640.1
Supplementary Contracts without Life Contingencies	554.2	535.5
Long-term Debt	2,827.5	2,968.8
Other Liabilities
Derivatives	142.9	170.5
Embedded Derivative in Modified Coinsurance Arrangement	65.4	83.9
Unfunded commitment to fund Investment Partnerships	$ 41.9	$ 83.7

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Quantitative Information Regarding Significant Unobservable Inputs (Details) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Embedded Derivative in Modified Coinsurance Arrangement	$ (65.4)		$ (83.9)
Fair Value Measurements, Valuation Techniques	- Projected Liability Cash Flows		- Projected Liability Cash Flows
Embedded Derivative in Modified Coinsurance Arrangement | Projected Cash Flows
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions	Actuarial Assumptions	[1]	Actuarial Assumptions	[1]
States, Municipalities, and Political Subdivisions
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of fixed maturity securities	118.5		42.7
Fair Value Measurements, Valuation Techniques	- Comparability Adjustment		- Comparability Adjustment - Lack of Marketability - Volatility of Credit
States, Municipalities, and Political Subdivisions | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.25%	[2]	0.25%	[2]
Volatility of Credit			0.15%	[3]
Lack of Marketability			0.25%	[4]
States, Municipalities, and Political Subdivisions | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	1.25%	[2]	0.25%	[2]
Volatility of Credit			0.15%	[3]
Lack of Marketability			0.25%	[4]
States, Municipalities, and Political Subdivisions | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.74%	[2]	0.25%	[2]
Volatility of Credit			0.15%	[3]
Lack of Marketability			0.25%	[4]
Public Utilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of fixed maturity securities	66.5		17.4
Fair Value Measurements, Valuation Techniques	- Volatility of Credit		- Comparability Adjustment
Public Utilities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[2]
Volatility of Credit	0.50%	[3]
Public Utilities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[2]
Volatility of Credit	0.75%	[3]
Public Utilities | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments			0.20%	[2]
Volatility of Credit	0.59%	[3]
Mortgage/Asset-backed Securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of fixed maturity securities	0.5		0.5
Fair Value Measurements, Valuation Techniques	- Discount for Size		- Discount for Size
Mortgage/Asset-backed Securities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	5.23%	[5]	5.74%	[5]
Mortgage/Asset-backed Securities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	5.33%	[5]	5.84%	[5]
Mortgage/Asset-backed Securities | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount for Size	5.31%	[5]	5.81%	[5]
All Other Corporate Bonds - Private
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of fixed maturity securities	234.2		391.8
Fair Value Measurements, Valuation Techniques	- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention		- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
All Other Corporate Bonds - Private | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions	Priced at Par	[6]	Priced at Par	[6]
All Other Corporate Bonds - Private | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.70%)	[2]	1.48%	[2]
Volatility of Credit	0.20%	[3]	(0.25%)	[3]
Discount for Size	0.50%	[5]	0.10%	[5]
Change in Benchmark Reference	2.71%	[7]	0.04%	[7]
Lack of Marketability	0.20%	[4]	0.10%	[4]
All Other Corporate Bonds - Private | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.40%)	[2]	1.48%	[2]
Volatility of Credit	4.00%	[3]	7.72%	[3]
Discount for Size	0.50%	[5]	0.50%	[5]
Change in Benchmark Reference	2.71%	[7]	2.89%	[7]
Lack of Marketability	1.00%	[4]	1.00%	[4]
All Other Corporate Bonds - Private | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.60%)	[2]	1.48%	[2]
Volatility of Credit	0.97%	[3]	1.51%	[3]
Discount for Size	0.50%	[5]	0.24%	[5]
Change in Benchmark Reference	2.71%	[7]	0.28%	[7]
Lack of Marketability	0.55%	[4]	0.46%	[4]
Corporate Bond Securities - Public
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair value of fixed maturity securities	228.8		165.0
Fair Value Measurements, Valuation Techniques	- Comparability Adjustment - Lack of Marketability - Volatility of Credit		- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
Corporate Bond Securities - Public | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions			Priced at Par	[6]
Corporate Bond Securities - Public | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	(0.62%)	[2]	(0.59%)	[2]
Volatility of Credit	(0.84%)	[3]	(0.30%)	[3]
Discount for Size			0.25%	[5]
Change in Benchmark Reference			0.25%	[7]
Lack of Marketability	0.20%	[4]	0.20%	[4]
Corporate Bond Securities - Public | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	1.00%	[2]	1.00%	[2]
Volatility of Credit	0.75%	[3]	(0.30%)	[3]
Discount for Size			0.25%	[5]
Change in Benchmark Reference			0.25%	[7]
Lack of Marketability	0.25%	[4]	0.30%	[4]
Corporate Bond Securities - Public | Weighted Average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Comparability Adjustments	0.27%	[2]	0.27%	[2]
Volatility of Credit	(0.29%)	[3]	(0.30%)	[3]
Discount for Size			0.25%	[5]
Change in Benchmark Reference			0.25%	[7]
Lack of Marketability	0.21%	[4]	0.24%	[4]
Equity Securites
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value of Equity Securities - Private	$ 4.0		$ 4.0
Fair Value Measurements, Valuation Techniques	- Market Convention		- Market Convention
Equity Securites | Market Convention
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant Assumptions	Priced at Cost or Owner's Equity	[6]	Priced at Cost or Owner's Equity	[6]

[1] Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

[2] Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

[3] Represents basis point adjustments for credit-specific factors

[4] Represents basis point adjustments to apply a discount due to the illiquidity of an investment

[5] Represents basis point adjustments based on issue/issuer size relative to the benchmark

[6] Represents a decision to price based on par value, cost, or owner's equity when limited data is available

[7] Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

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Mortgage Loans by Property Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,776.1	$ 1,712.7
Percent of Total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	70.4	47.2
Percent of Total	4.00%	2.70%
Industrial
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	564.5	545.7
Percent of Total	31.80%	31.90%
Office
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	732.4	721.2
Percent of Total	41.20%	42.10%
Retail
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 408.8	$ 398.6
Percent of Total	23.00%	23.30%

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Schedule of Net Unrealized Gain on Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Change in Components of Net Unrealized Gain on Securities
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ (151.3)	$ 594.2	$ (1,854.9)	$ 961.0
Fixed Maturity Securities
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	4,659.6		7,221.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(249.2)		(2,811.1)
Balance, End of Period, Net of Tax	4,410.4		4,410.4
Other Investments
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	57.1		92.8
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	8.1		(27.6)
Balance, End of Period, Net of Tax	65.2		65.2
Deferred Acquisition Costs
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(43.8)		(67.0)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	1.0		24.2
Balance, End of Period, Net of Tax	(42.8)		(42.8)
Reserve for Future Policy and Contract Benefits
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(4,498.1)		(6,277.5)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	460.5		2,239.9
Balance, End of Period, Net of Tax	(4,037.6)		(4,037.6)
Reinsurance Recoverable
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	283.6		351.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(8.6)		(76.5)
Balance, End of Period, Net of Tax	275.0		275.0
Deferred Income Tax Charges
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	(162.8)		(447.8)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(80.0)		205.0
Balance, End of Period, Net of Tax	(242.8)		(242.8)
Net Unrealized Gain on Securities
Change in Components of Net Unrealized Gain on Securities
Balance, Beginning of Period, Net of Tax	295.6		873.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	131.8		(446.1)
Balance, End of Period, Net of Tax	$ 427.4		$ 427.4

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Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives Fair Value	$ 24.5	$ 81.6
Liability Derivatives Fair Value	142.9	170.5
Designated as Hedging Instrument | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	24.5	81.6
Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	141.4	170.5
Designated as Hedging Instrument | Interest Rate Swaps | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	22.5	76.5
Designated as Hedging Instrument | Interest Rate Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	33.8	31.7
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Long-term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	2.0	5.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	107.6	138.8
Not Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	66.9
Not Designated as Hedging Instrument | Credit Default Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	1.5
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	$ 65.4	$ 83.9

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Investments Investment Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	$ 630.1	$ 633.7	$ 1,906.5	$ 1,916.6
Less Investment Expenses	7.2	6.3	21.1	20.3
Less Investment Income on PFA Assets	3.9	4.1	11.8	12.1
Less Amortization of Tax Credit Partnerships	3.5	4.1	10.9	12.0
Net Investment Income	615.5	619.2	1,862.7	1,872.2
Fixed Income Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	584.2	589.0	1,771.3	1,790.8
Derivative [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	8.9	9.1	25.6	22.0
Mortgage Receivable [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	28.5	25.5	81.6	76.5
Policy Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	4.0	3.7	11.6	10.8
Other Long-term Investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	4.0	5.4	14.5	13.2
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	$ 0.5	$ 1.0	$ 1.9	$ 3.3

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments [Abstract]
Fixed Maturity Securities, Amortized Cost	$ 38,187.2	$ 37,751.5
Stockholders' Equity
Common Stock, Par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	360,453,150	359,751,943
Treasury Stock, Shares	99,313,512	89,546,758

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Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 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 June 30, 2013		$	295.6		$	405.5		$	(141.6	)	$	(342.8	)	$	216.7
	Other Comprehensive Income (Loss) Before Reclassifications	113.9			(3.2		)	68.2			2.9			181.8
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	17.9			(5.1		)	—			(1.7		)	11.1
	Net Other Comprehensive Income (Loss)	131.8			(8.3		)	68.2			1.2			192.9
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(452.5		)	4.3			(0.8		)	217.7			(231.3		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	6.4			(8.7		)	—			15.2			12.9
	Net Other Comprehensive Income (Loss)	(446.1		)	(4.4		)	(0.8		)	232.9			(218.4		)
Balance at September 30, 2013		$	427.4		$	397.2		$	(73.4	)	$	(341.6	)	$	409.6

The net unrealized gain on securities consists of the following components:

										Change at September 30, 2013
	September 30			June 30			December 31			Three Months			Nine Months
	2013			2013			2012			Ended			Ended
	(in millions of dollars)
Fixed Maturity Securities	$	4,410.4		$	4,659.6		$	7,221.5		$	(249.2	)	$	(2,811.1	)
Other Investments	65.2			57.1			92.8			8.1			(27.6		)
Deferred Acquisition Costs	(42.8		)	(43.8		)	(67.0		)	1.0			24.2
Reserves for Future Policy and Contract Benefits	(4,037.6		)	(4,498.1		)	(6,277.5		)	460.5			2,239.9
Reinsurance Recoverable	275.0			283.6			351.5			(8.6		)	(76.5		)
Deferred Income Tax	(242.8		)	(162.8		)	(447.8		)	(80.0		)	205.0
Total	$	427.4		$	295.6		$	873.5		$	131.8		$	(446.1	)

Amounts reclassified from accumulated other comprehensive income were recognized in our consolidated statements of income as follows:

			September 30, 2013
			Three Months			Nine Months
			Ended			Ended
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain (Loss)
		Loss on Sales of Securities and Other Invested Assets	$	(27.5	)	$	(9.1	)
		Other-Than-Temporary Impairment Loss	—			(0.8		)
			(27.5		)	(9.9		)
	Income Tax Benefit		(9.6		)	(3.5		)
	Total		$	(17.9	)	$	(6.4	)
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	11.1		$	32.2
		Loss on Foreign Exchange Contracts	(1.4		)	(4.6		)
	Net Realized Investment Gain (Loss)
		Gain (Loss) on Interest Rate Swaps	(0.1		)	0.7
		Loss on Foreign Exchange Contracts	(1.3		)	(13.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)	(1.2		)
			7.9			13.4
	Income Tax Expense		2.8			4.7
	Total		$	5.1		$	8.7
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(2.7	)	$	(30.5	)
		Amortization of Prior Service Credit	1.1			3.6
		Curtailment Gain	3.7			3.0
			2.1			(23.9		)
	Income Tax Expense (Benefit)		0.4			(8.7		)
	Total		$	1.7		$	(15.2	)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Income	$ 205.7	$ 230.2	$ 636.9	$ 660.5
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(89.8); $301.7; $(983.8); $494.5)	(151.3)	594.2	(1,854.9)	961.0
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $169.8; $(213.5); $778.8; $(344.0))	283.1	(430.1)	1,408.8	(683.6)
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $5.2; $6.0; $1.9; $5.3)	(8.3)	(10.3)	(4.4)	(8.4)
Change in Foreign Currency Translation Adjustment	68.2	29.4	(0.8)	39.0
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $0.5; $3.5; $124.9; $11.0)	1.2	6.6	232.9	20.5
Total Other Comprehensive Income (Loss)	192.9	189.8	(218.4)	328.5
Comprehensive Income	$ 398.6	$ 420.0	$ 418.5	$ 989.0

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Selected Operating Statement Data by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Premium Income	$ 1,897.3	$ 1,929.4	$ 5,734.0	$ 5,778.9
Net Investment Income	615.5	619.2	1,862.7	1,872.2
Other Income	54.2	58.1	173.4	174.5
Operating Revenue	2,567.0	2,606.7	7,770.1	7,825.6
Operating Income (Loss)	312.9	310.7	932.4	930.0
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income	1,124.6	1,111.9	3,395.8	3,338.9
Net Investment Income	233.1	236.3	699.9	711.8
Other Income	30.2	31.3	99.0	93.1
Operating Revenue	1,387.9	1,379.5	4,194.7	4,143.8
Operating Income (Loss)	219.8	216.3	641.9	634.9
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income	137.3	175.2	418.7	519.1
Net Investment Income	30.3	34.8	106.5	120.5
Other Income	0.1	0	0.1	0.1
Operating Revenue	167.7	210.0	525.3	639.7
Operating Income (Loss)	31.3	27.5	96.1	96.3
Colonial Life
Segment Reporting Information [Line Items]
Premium Income	309.1	299.4	924.1	892.6
Net Investment Income	36.3	33.9	110.3	103.5
Other Income	0	0	0.1	0.2
Operating Revenue	345.4	333.3	1,034.5	996.3
Operating Income (Loss)	69.0	68.7	215.5	206.0
Closed Block
Segment Reporting Information [Line Items]
Premium Income	326.3	342.9	995.4	1,028.3
Net Investment Income	315.4	307.3	944.6	913.4
Other Income	23.6	26.4	71.5	78.9
Operating Revenue	665.3	676.6	2,011.5	2,020.6
Operating Income (Loss)	25.7	25.6	82.6	66.7
Corporate
Segment Reporting Information [Line Items]
Premium Income	0	0	0	0
Net Investment Income	0.4	6.9	1.4	23.0
Other Income	0.3	0.4	2.7	2.2
Operating Revenue	0.7	7.3	4.1	25.2
Operating Income (Loss)	$ (32.9)	$ (27.4)	$ (103.7)	$ (73.9)

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments
Fixed Maturity Securities - at fair value (amortized cost: $38,187.2; $37,751.5)	$ 42,597.6	$ 44,973.0
Mortgage Loans	1,776.1	1,712.7
Policy Loans	3,242.5	3,133.8
Other Long-term Investments	564.5	625.0
Short-term Investments	941.0	1,460.3
Total Investments	49,121.7	51,904.8
Other Assets
Cash and Bank Deposits	63.0	77.3
Accounts and Premiums Receivable	1,650.9	1,632.6
Reinsurance Recoverable	4,870.7	4,842.6
Accrued Investment Income	700.8	694.6
Deferred Acquisition Costs	1,804.9	1,755.5
Goodwill	201.7	201.7
Property and Equipment	508.8	501.6
Income Tax Receivable	31.1	0
Other Assets	632.2	625.4
Total Assets	59,585.8	62,236.1
Liabilities
Policy and Contract Benefits	1,515.1	1,484.6
Reserves for Future Policy and Contract Benefits	42,836.8	44,694.4
Unearned Premiums	483.2	426.7
Other Policyholders' Funds	1,636.0	1,644.9
Income Tax Payable	0	54.2
Deferred Income Tax	186.3	269.4
Short-term Debt	140.5	455.8
Long-term Debt	2,631.3	2,755.4
Other Liabilities	1,486.7	1,838.1
Total Liabilities	50,915.9	53,623.5
Commitments and Contingent Liabilities - Note 10
Stockholders' Equity
Common Stock, $0.10 par, Authorized: 725,000,000 shares; Issued: 360,453,150 and 359,751,943 shares	36.0	36.0
Additional Paid-in Capital	2,623.8	2,607.7
Accumulated Other Comprehensive Income	409.6	628.0
Retained Earnings	7,899.7	7,371.6
Treasury Stock - at cost: 99,313,512 and 89,546,758 shares	(2,299.2)	(2,030.7)
Total Stockholders' Equity	8,669.9	8,612.6
Total Liabilities and Stockholders' Equity	$ 59,585.8	$ 62,236.1

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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	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ (8.4)	$ 5.5	$ 7.1	$ 50.2
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	7.9	(5.5)	13.4	11.8
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0	20.2	(7.1)	55.1
Interest Rate Swaps | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	11.1	11.7	32.2	30.4
Interest Rate Swaps | Net Realized Investments Gain Loss
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.1)	0.1	0.7	2.2
Interest Rate Swaps | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.4)	(0.5)	(1.2)	(1.3)
Options Held
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0	0	(0.1)	0
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(8.4)	(14.7)	14.3	(4.9)
Foreign Exchange Contracts | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1.4)	(0.1)	(4.6)	(0.9)
Foreign Exchange Contracts | Net Realized Investments Gain Loss
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (1.3)	$ (16.7)	$ (13.7)	$ (18.6)

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Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fixed Maturity Securities
Fixed Maturity Securities	$ 42,597.6	$ 44,973.0
Other Long-term Investments
Derivative Assets	24.5	81.6
Equity Securities
Equity Securities	15.5	14.6
Other Liabilities
Derivative Liabilities	208.3	254.4
Interest Rate Swaps
Other Long-term Investments
Derivative Assets	22.5	76.5
Other Liabilities
Derivative Liabilities	33.8	31.7
Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.0	5.1
Other Liabilities
Derivative Liabilities	107.6	138.8
Credit Default Swaps
Other Liabilities
Derivative Liabilities	1.5
Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	65.4	83.9
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,223.2	1,348.8
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,769.8	1,806.8
Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,375.3	1,507.0
Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	10,556.7	11,144.2
Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,161.6	2,216.5
All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	25,472.8	26,910.4
Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	38.2	39.3
Fair Value, Inputs, Level 1
Fixed Maturity Securities
Fixed Maturity Securities	4,368.5	2,218.4
Other Long-term Investments
Derivative Assets	0	0
Equity Securities
Equity Securities	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 | Interest Rate Swaps
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 | Credit Default Swaps
Other Liabilities
Derivative Liabilities	0
Fair Value, Inputs, Level 1 | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	135.1	104.1
Fair Value, Inputs, Level 1 | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	0	53.0
Fair Value, Inputs, Level 1 | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 1 | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	692.0	84.2
Fair Value, Inputs, Level 1 | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 1 | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	3,541.4	1,977.1
Fair Value, Inputs, Level 1 | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 2
Fixed Maturity Securities
Fixed Maturity Securities	36,469.7	40,766.3
Other Long-term Investments
Derivative Assets	24.5	81.6
Equity Securities
Equity Securities	11.1	10.3
Other Liabilities
Derivative Liabilities	142.9	170.5
Fair Value, Inputs, Level 2 | Interest Rate Swaps
Other Long-term Investments
Derivative Assets	22.5	76.5
Other Liabilities
Derivative Liabilities	33.8	31.7
Fair Value, Inputs, Level 2 | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.0	5.1
Other Liabilities
Derivative Liabilities	107.6	138.8
Fair Value, Inputs, Level 2 | Credit Default Swaps
Other Liabilities
Derivative Liabilities	1.5
Fair Value, Inputs, Level 2 | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 2 | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,088.1	1,244.7
Fair Value, Inputs, Level 2 | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,617.9	1,625.1
Fair Value, Inputs, Level 2 | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,296.7	1,424.9
Fair Value, Inputs, Level 2 | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	9,572.9	10,485.6
Fair Value, Inputs, Level 2 | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,161.1	2,216.0
Fair Value, Inputs, Level 2 | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	20,718.9	23,755.5
Fair Value, Inputs, Level 2 | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	14.1	14.5
Fair Value, Inputs, Level 3
Fixed Maturity Securities
Fixed Maturity Securities	1,759.4	1,988.3
Other Long-term Investments
Derivative Assets	0	0
Equity Securities
Equity Securities	4.4	4.3
Other Liabilities
Derivative Liabilities	65.4	83.9
Fair Value, Inputs, Level 3 | Interest Rate Swaps
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 3 | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 3 | Credit Default Swaps
Other Liabilities
Derivative Liabilities	0
Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	65.4	83.9
Fair Value, Inputs, Level 3 | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 3 | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	151.9	128.7
Fair Value, Inputs, Level 3 | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	78.6	82.1
Fair Value, Inputs, Level 3 | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	291.8	574.4
Fair Value, Inputs, Level 3 | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	0.5	0.5
Fair Value, Inputs, Level 3 | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	1,212.5	1,177.8
Fair Value, Inputs, Level 3 | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	$ 24.1	$ 24.8

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 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.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	—	$	—	$	1,309.5
Additions	—		—		250.0		—		25.0		—		275.0
Terminations	—		26.3		45.0		—		—		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	—	$	—	$	1,413.0
Additions	—		—		250.0		—		81.0		—		331.0
Terminations	—		39.8		135.0		—		56.0		—		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at June 30, 2013	$	174.0	$	474.7	$	675.0	$	70.0	$	—	$	10.0	$	1,403.7
Additions	—		10.0		—		—		—		—		10.0
Terminations	24.0		3.6		40.0		—		—		10.0		77.6
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	—	$	1,432.8
Additions	—		10.0		—		70.0		24.0		10.0		114.0
Terminations	24.0		37.7		115.0		—		24.0		10.0		210.7
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1

Timing of Anticipated Settlements of Interest Rate Swaps Outstanding

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	35.0
Weighted Average Receive Rate	6.82		%
Weighted Average Pay Rate	0.25		%

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.

	September 30, 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	$	22.5	Other Liabilities	$	33.8
Foreign Exchange Contracts	Other L-T Investments	2.0		Other Liabilities	107.6
Total		$	24.5		$	141.4
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.5
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	65.4
Total					$	66.9

	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.

		Three Months Ended September 30						Nine Months Ended September 30
		2013			2012			2013			2012
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	—		$	20.2		$	(7.1	)	$	55.1
Options		—			—			(0.1		)	—
Foreign Exchange Contracts		(8.4		)	(14.7		)	14.3			(4.9		)
	Total	$	(8.4	)	$	5.5		$	7.1		$	50.2
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	11.1		$	11.7		$	32.2		$	30.4
	Foreign Exchange Contracts	(1.4		)	(0.1		)	(4.6		)	(0.9		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	(0.1		)	0.1			0.7			2.2
	Foreign Exchange Contracts	(1.3		)	(16.7		)	(13.7		)	(18.6		)
Interest and Debt Expense
	Interest Rate Swaps	(0.4		)	(0.5		)	(1.2		)	(1.3		)
	Total	$	7.9		$	(5.5	)	$	13.4		$	11.8

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.

		Three Months Ended September 30					Nine Months Ended September 30
		2013			2012		2013			2012
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.0	)	$	—	$	(1.5	)	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7		18.5			28.7
	Total	$	(1.3	)	$	19.7	$	17.0		$	28.7

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Investments Offsetting for Derivatives and Securities Lending Balances (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Securities Lending [Abstract]
Securities Lending Agreements Offset in Balance Sheet	$ 0	$ 0
Securities Lending Asset Offsets [Abstract]
Securities Loaned	254.4	452.8
Cash collateral offset against securities purchased	(140.5)	(452.8)
Net Exposure on Securities Purchased	0	0
Securities Lending Liability Offsets [Abstract]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	140.5	455.8
Investment Securities Invested from Securities Lending Transactions	(140.5)	(452.8)
Cash Collateral Pledged on Securities Lending Transactions	0	0
Securities Lending Agreements, Net	0	3.0
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	24.5	81.6
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	24.5	81.6
Financial Instruments Pledged as Collateral from Counterparty	(22.8)	(72.9)
Cash collateral from counterparties	(1.3)	0
Derivative Asset, Fair Value, Net	0.4	8.7
Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	142.9	170.5
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	142.9	170.5
Financial Instruments Pledged as Collateral to Counterparty	(112.3)	(129.8)
Derivative, Collateral, Right to Reclaim Cash	0	(1.8)
Derivative Liability, Fair Value, Net	30.6	38.9
Financial Assets [Abstract]
Financial Assets Subject to Master Netting Arrangements, Gross	278.9	534.4
Financial Assets Subject to Master Netting Arrangemetns Offset in the Balance Sheet	0	0
Financial Assets Subject to Master Netting Arrangements Presented in Balance Sheet	278.9	534.4
Total Financial Instruments Received as Collateral	(136.7)	(72.9)
Total Cash Received as Collateral from Contracts with Master Netting Arrangements	(141.8)	(452.8)
Financial Assets Subject to Master Netting Arrangements, Net	0.4	8.7
Financial Liabilities [Abstract]
Financial Liabilities Subject to Master Netting Arrangements, Gross	283.4	626.3
Financial Liabilities Subject to Master Netting Arrangements Offset in the Balance Sheet	0	0
Financial Liabilities Subject to Master Netting Arrangements Presented in Balance Sheet	283.4	626.3
Total Financial Instruments Pledged as Collateral to Counterparty	(252.8)	(582.6)
Total Cash Pledged as Collateral on Contracts with Master Netting Arrangements	0	(1.8)
Financial Liabilities Subject to Master Netting Arrangements, Net	$ 30.6	$ 41.9

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Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income
Balance, Beginning of Period	$ 216.7		$ 628.0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	181.8		(231.3)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	11.1		12.9
Total Other Comprehensive Income (Loss)	192.9	189.8	(218.4)	328.5
Balance, End of Period	409.6		409.6
Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income
Balance, Beginning of Period	295.6		873.5
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	113.9		(452.5)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	17.9		6.4
Total Other Comprehensive Income (Loss)	131.8		(446.1)
Balance, End of Period	427.4		427.4
Net Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance, Beginning of Period	405.5		401.6
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(3.2)		4.3
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	(5.1)		(8.7)
Total Other Comprehensive Income (Loss)	(8.3)		(4.4)
Balance, End of Period	397.2		397.2
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(141.6)		(72.6)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	68.2		(0.8)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	0		0
Total Other Comprehensive Income (Loss)	68.2		(0.8)
Balance, End of Period	(73.4)		(73.4)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(342.8)		(574.5)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	2.9		217.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	(1.7)		15.2
Total Other Comprehensive Income (Loss)	1.2		232.9
Balance, End of Period	$ (341.6)		$ (341.6)

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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		9 Months Ended		12 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2012 Share Repurchase Program Expire In January 2014 [Member]	Sep. 30, 2013 Share Repurchase Program Expire In January 2014 [Member]	Mar. 31, 2011 Share Repurchase Program Expire In August 2012 [Member]	Sep. 30, 2013 Share Repurchase Program Expire In August 2012 [Member]
Stockholders Equity Note [Line Items]
Oustanding Stock Options, grant price range, lower limit	$ 11.37		$ 11.37
Oustanding Stock Options, grant price range, upper limit	$ 26.29		$ 26.29
Outstanding Nonvested stock awards, grant prices range, lower limit	$ 19.38		$ 19.38
Outstanding Nonvested stock awards, grant prices range, upper limit	$ 32.35		$ 32.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 23.97
Antidilutive common shares not included in the computation of dilutive earnings per share	0	2,800,000	100,000	2,400,000
Stock Repurchase Program, Authorized Amount						$ 750.0		$ 1,000.0
Stock Repurchase Program Remaining Authorized Repurchase Amount							281.6		0
Shares Repurchased Cost Commissions		0.1	0.1	0.4	0.6
Treasury Stock, Shares, Acquired	2,500,000	5,100,000	9,800,000	18,600,000	23,600,000
Treasury Stock, Value, Acquired, Cost Method	$ 75.0	$ 100.2	$ 268.5	$ 400.5	$ 500.6
Preferred stock, authorized	25,000,000		25,000,000
Preferred stock, par value	$ 0.10		$ 0.10
Preferred stock, issued	0		0

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,776.1	$ 1,712.7
Aa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	10.9	11.5
A
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	678.8	659.4
Baa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	1,049.3	994.5
Ba
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	24.0	34.2
B
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 13.1	$ 13.1

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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	Sep. 30, 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	$ 4,359.5	$ 586.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	254.2	11.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	285.9	596.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	33.4	44.2
US Government and Government Agencies and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42.0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2.1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5.4	6.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2.2	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	336.3	30.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	31.1	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	5.8	6.9
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	32.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2.0
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	764.4	110.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	42.5	3.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	43.1	147.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	6.6	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	47.9	4.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0.9	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3.1	3.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.5	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	3,136.5	441.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	175.6	7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	197.1	396.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 18.3	$ 24.5

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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 882.7	$ 956.4
Over 1 year through 5 years	7,027.3	5,922.8
Over 5 years through 10 years	9,052.5	9,752.3
Over 10 years	19,277.7	19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal	36,240.2	35,823.6
Mortgage/Asset-Backed Securities	1,947.0	1,927.9
Total Fixed Maturity Securities	38,187.2	37,751.5
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	15.8	21.2
Over 1 year through 5 years	728.5	628.1
Over 5 years through 10 years	1,003.4	1,606.4
Over 10 years	2,734.3	4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal	4,482.0	6,988.4
Mortgage/Asset-Backed Securities	216.0	289.1
Total Fixed Maturity Securities	4,698.0	7,277.5
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.1	0.5
Over 1 year through 5 years	2.2	5.0
Over 5 years through 10 years	88.7	7.6
Over 10 years	195.2	42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal	286.2	55.5
Mortgage/Asset-Backed Securities	1.4	0.5
Total Fixed Maturity Securities	287.6	56.0
Fair Value of Fixed Maturity Securities in Unrealized Gain Position
Fair Value Maturity Distribution [Abstract]
1 year or less	874.5	934.1
Over 1 year through 5 years	7,629.0	6,449.8
Over 5 years through 10 years	8,094.1	10,997.0
Over 10 years	19,244.0	23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	35,841.6	41,581.1
Mortgage/Asset-Backed Securities	2,110.6	2,208.3
Fair value of fixed maturity securities	37,952.2	43,789.4
Fair Value of Fixed Maturity Securities in Unrealized Loss Position
Fair Value Maturity Distribution [Abstract]
1 year or less	23.9	43.0
Over 1 year through 5 years	124.6	96.1
Over 5 years through 10 years	1,873.1	354.1
Over 10 years	2,572.8	682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	4,594.4	1,175.4
Mortgage/Asset-Backed Securities	51.0	8.2
Fair value of fixed maturity securities	$ 4,645.4	$ 1,183.6

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 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.

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 interest payments and debt repayments 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 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 debt 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 less collateral held, was $0.4 million at September 30, 2013. We held $1.3 million cash collateral from our counterparties at September 30, 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 $91.5 million and $108.6 million at September 30, 2013 and December 31, 2012, respectively. We had no cash posted as collateral to our counterparties at September 30, 2013. We had $1.8 million cash posted as collateral to our counterparties at December 31, 2012.

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 $142.9 million and $170.5 million at September 30, 2013 and December 31, 2012, respectively.

Derivative Transactions

The table below summarizes, by notional amounts, the activity for each category of derivatives.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Credit Default		Forwards		Options		Total
	(in millions of dollars)
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	—	$	—	$	1,309.5
Additions	—		—		250.0		—		25.0		—		275.0
Terminations	—		26.3		45.0		—		—		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	—	$	—	$	1,413.0
Additions	—		—		250.0		—		81.0		—		331.0
Terminations	—		39.8		135.0		—		56.0		—		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	—	$	25.0	$	—	$	1,513.2
Balance at June 30, 2013	$	174.0	$	474.7	$	675.0	$	70.0	$	—	$	10.0	$	1,403.7
Additions	—		10.0		—		—		—		—		10.0
Terminations	24.0		3.6		40.0		—		—		10.0		77.6
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	—	$	1,432.8
Additions	—		10.0		—		70.0		24.0		10.0		114.0
Terminations	24.0		37.7		115.0		—		24.0		10.0		210.7
Balance at September 30, 2013	$	150.0	$	481.1	$	635.0	$	70.0	$	—	$	—	$	1,336.1

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	35.0
Weighted Average Receive Rate	6.82		%
Weighted Average Pay Rate	0.25		%

Cash Flow Hedges

As of September 30, 2013 and December 31, 2012, we had $35.0 million and $150.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $481.1 million and $508.8 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

For the three and nine months ended September 30, 2013 and 2012, 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 September 30, 2013, we expect to amortize approximately $45.7 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. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2013. Fluctuations in fair values of these derivatives between September 30, 2013 and the date of termination will vary our projected amortization. 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 September 30, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2013 and December 31, 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. Changes in the fair value of the derivative 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 change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a loss of $2.9 million and $9.7 million for the three and nine months ended September 30, 2013, respectively, and a gain of $0.2 million and $0.4 million for the three and nine months ended September 30, 2012, respectively, with an offsetting gain or loss on the related interest rate swaps.

As of September 30, 2013 and December 31, 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 $(1.8) million and $17.3 million for the three and nine months ended September 30, 2013, respectively, and a loss of $4.1 million and $8.3 million for the three and nine months ended September 30, 2012, respectively, with an offsetting gain or loss on the related interest rate swaps.

For the three and nine months ended September 30, 2013 and 2012, 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 September 30, 2013, we held $70.0 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. Changes in the fair value of the derivative, together with the payment of periodic fees, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value. 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. Changes in the fair value of the embedded derivative are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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.

	September 30, 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	$	22.5	Other Liabilities	$	33.8
Foreign Exchange Contracts	Other L-T Investments	2.0		Other Liabilities	107.6
Total		$	24.5		$	141.4
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	1.5
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	65.4
Total					$	66.9

	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.

		Three Months Ended September 30						Nine Months Ended September 30
		2013			2012			2013			2012
		(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Interest Rate Swaps and Forwards		$	—		$	20.2		$	(7.1	)	$	55.1
Options		—			—			(0.1		)	—
Foreign Exchange Contracts		(8.4		)	(14.7		)	14.3			(4.9		)
	Total	$	(8.4	)	$	5.5		$	7.1		$	50.2
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Net Investment Income
	Interest Rate Swaps and Forwards	$	11.1		$	11.7		$	32.2		$	30.4
	Foreign Exchange Contracts	(1.4		)	(0.1		)	(4.6		)	(0.9		)
Net Realized Investment Gain (Loss)
	Interest Rate Swaps	(0.1		)	0.1			0.7			2.2
	Foreign Exchange Contracts	(1.3		)	(16.7		)	(13.7		)	(18.6		)
Interest and Debt Expense
	Interest Rate Swaps	(0.4		)	(0.5		)	(1.2		)	(1.3		)
	Total	$	7.9		$	(5.5	)	$	13.4		$	11.8

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.

		Three Months Ended September 30					Nine Months Ended September 30
		2013			2012		2013			2012
		(in millions of dollars)
Net Realized Investment Gain (Loss)
	Credit Default Swaps	$	(1.0	)	$	—	$	(1.5	)	$	—
	Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7		18.5			28.7
	Total	$	(1.3	)	$	19.7	$	17.0		$	28.7

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Employee Benefit Plans - Additional Information (Detail)	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended					6 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013 USD ($)	Jun. 30, 2013 Pension Benefits, U.S. Plans USD ($)	Sep. 30, 2013 Pension Benefits, U.S. Plans	Dec. 31, 2012 Pension Benefits, U.S. Plans	Dec. 31, 2013 Foreign Pension Plans, U.K. Plan Rate	Sep. 30, 2013 Foreign Pension Plans, U.K. Plan USD ($) Rate	Sep. 30, 2013 Foreign Pension Plans, U.K. Plan GBP (£) Rate	Jun. 30, 2013 Foreign Pension Plans, U.K. Plan USD ($) Rate	Jun. 30, 2013 Foreign Pension Plans, U.K. Plan GBP (£) Rate	Jun. 30, 2013 Foreign Pension Plans, U.K. Plan Rate	Sep. 30, 2013 Foreign Pension Plans, U.K. Plan USD ($) Rate	Sep. 30, 2013 Foreign Pension Plans, U.K. Plan GBP (£) Rate	Dec. 31, 2012 Foreign Pension Plans, U.K. Plan	Sep. 30, 2013 UNITED STATES Defined Contribution Pension USD ($)	Dec. 31, 2014 UNITED STATES Defined Contribution Pension	Dec. 31, 2014 UNITED KINGDOM Defined Contribution Pension GBP (£) Rate	Sep. 30, 2013 UNITED KINGDOM Defined Contribution Pension	Dec. 31, 2014 UNITED KINGDOM Defined Contribution Pension
Pension and Other Postretirement Benefits Disclosure
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.00%		4.50%		4.60%	4.60%				4.60%	4.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets			7.50%	7.50%		6.35%	6.35%			6.20%
Before-tax Change in Pension Liability Due to Pension Plan Amendment		$ (327,400,000)				$ (2,300,000)	£ (1,500,000)
Defined Benefit Plan, Income Tax on Change in AOCI due to US Pension Plan Amendment		(114,600,000)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments		(700,000)						3,700,000	2,300,000
Description of Contribution Requirements on Defined Contribution Pension Plan			We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013
Pension Contributions		50,000,000				900,000	600,000				2,800,000	1,800,000
Maximum Inflation Rate on Pensionable Earnings						2.50%	2.50%	5.00%	5.00%	5.00%	2.50%	2.50%
Pension Plan Contributions, Percent of Pensionable Earnings					30.00%						24.80%	24.80%
Average Remaining Life Expectancy of Plan Participants		30 years				35 years	35 years						11 years
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Current Fiscal Year	28,100,000
Pension, Amount that will be recognized from AOCI to Income, after tax	18,500,000
Defined Contribution Plan, Employer Matching Contribution, Percent														3.00%	5.00%		5.00%	5.00%
Defined Contribution Plan, Employer Matching Contribution on amts over 3%														0.50
Defined Contribution Plan, Employer Matching Contribution % for $0.50														2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount															4.50%	6.00%	5.00%
Defined Contribution Plan, Employer Matching Contribution for Every Pound on the First One Percent of Employee Contributions																£ 2
Defined Contribution Plan, Employee Contribution Percentage Received 2-for-1 Employer Match																1.00%

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Transfers of Assets between Level 1 and Level 2 (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	$ 3,162.3	$ 3,570.8
Level 2 from Level 1	1,098.8	2,284.9
Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	1,795.7	3,026.8
Level 2 from Level 1	3,665.7	2,534.4
United States Government and Government Agencies and Authorities | First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	48.0	205.9
Level 2 from Level 1	0	20.5
United States Government and Government Agencies and Authorities | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	21.7	426.8
Level 2 from Level 1	164.6	60.5
States, Municipalities, and Political Subdivisions | First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	0	41.9
Level 2 from Level 1	53.1	74.8
States, Municipalities, and Political Subdivisions | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	0	43.0
Level 2 from Level 1	31.8	62.9
Foreign Government Debt Securities [Member] | First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	0	20.7
Level 2 from Level 1	0	0
Foreign Government Debt Securities [Member] | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	0	21.7
Level 2 from Level 1	0	0
Public Utilities | First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	577.9	479.0
Level 2 from Level 1	53.5	483.6
Public Utilities | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	367.1	382.4
Level 2 from Level 1	584.7	743.6
All Other Corporate Bonds | First and Second Quarters
Fixed Maturity Securities
Level 1 from Level 2	2,536.4	2,823.3
Level 2 from Level 1	992.2	1,706.0
All Other Corporate Bonds | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	1,406.9	2,152.9
Level 2 from Level 1	2,884.6	1,667.4
Equity Securites | Second Quarter
Fixed Maturity Securities
Level 1 from Level 2	0	0
Level 2 from Level 1	$ 0	$ 7.4

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Impaired Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Recorded Investment		$ 17.4
Unpaid Principal Balance		18.9
Related Allowance		1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment		4.3
Unpaid Principal Balance		4.3
Related Allowance		0
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

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2013

Notes to Financial Statements [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

Employee Benefit Plans

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.K. defined benefit pension plan was closed to new entrants on December 31, 2002.

U.S. Plans

In June 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 the second quarter of 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 during the second quarter of 2013, 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, during the second quarter of 2013 we recognized a $0.7 million curtailment loss, 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.

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013;however, we elected to make a voluntary contribution of $50.0 million to this plan during the second quarter of 2013.

U.K. Plan

In September 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 the third quarter of 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.

As a result of these plan amendments, during the third quarter of 2013, we recognized a curtailment gain of $3.7 million, or £2.3 million, 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.

We made required contributions to our U.K. plan of $0.9 million and $2.8 million, or approximately £0.6 million and £1.8 million, during the three and nine months ended September 30, 2013, respectively. Effective October 1, 2013, we will increase contributions to the U.K. plan from 24.8 percent to 30.0 percent of pensionable earnings for plan participants. Subsequent to June 30, 2014, we will no longer be subject to required contributions, but we may make voluntary contributions in the future as is deemed necessary. Contributions to the U.K. plan are sufficient to meet the minimum funding requirements under U.K. law.

Amortization of Actuarial Gain or Loss

In addition, 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, which is approximately 30 years for U.S. participants and 35 years for U.K. participants. The net actuarial loss was previously amortized over the average future working life of pension plan participants, or approximately 11 years.

Net Periodic Benefit Cost (Credit)

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 benefit cost during 2013 is approximately $28.1 million before tax and $18.5 million after tax.

The components of net periodic benefit cost (credit) related to the Company's defined benefit pension and OPEB plans are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.8		$	12.2		$	1.0		$	1.2		$	0.2		$	0.4
Interest Cost	21.3			21.1			2.1			2.2			2.0			2.3
Expected Return on Plan Assets	(27.2		)	(22.2		)	(3.1		)	(2.8		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	2.3			11.5			0.4			0.1			—			—
Prior Service Cost (Credit)	0.1			(0.1		)	—			—			(1.2		)	(0.6		)
Curtailment Gain	—			—			(3.7		)	—			—			—
Total	$	11.3		$	22.5		$	(3.3	)	$	0.7		$	0.8		$	1.9

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						U.K. Plan						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	44.6		$	36.6		$	3.2		$	3.6		$	0.6		$	1.2
Interest Cost	65.0			63.3			6.3			6.4			6.0			7.1
Expected Return on Plan Assets	(78.5		)	(66.5		)	(9.1		)	(8.3		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	29.4			34.4			1.1			0.4			—			—
Prior Service Cost (Credit)	0.1			(0.4		)	—			—			(3.7		)	(1.9		)
Curtailment Loss (Gain)	0.7			—			(3.7		)	—			—			—
Total	$	61.3		$	67.4		$	(2.2	)	$	2.1		$	2.4		$	5.9

Defined Contribution Plans

We offer a 401(k) plan to all eligible U.S. employees under which a portion of employee contributions is matched. Currently, we match 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. 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 will also include any performance-based incentive compensation as part of the definition of earnings for purposes of contributions. Also effective January 1, 2014, we will 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. In addition, a separate transition contribution will be made for eligible employees who meet certain age and years of service criteria. The 401(k) plan will continue to qualify for a “safe harbor” from annual discrimination testing.  These changes are in compliance with Employee Retirement Income Security Act (ERISA) guidelines.

We also offer a defined contribution plan to all eligible U.K. employees under which a portion of employee contributions is matched. Currently, we match pound-for-pound up to 5.0 percent of base salary for employee contributions into the defined contribution plan and make an additional non-elective contribution of 5.0 percent of base salary. 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. Also effective July 1, 2014, we will increase the non-elective contribution to 6.0 percent of base salary for all eligible employees. In addition, a separate transition contribution will be made for all eligible employees through March 31, 2016.

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Investments

9 Months Ended

Sep. 30, 2013

Notes to Financial Statements [Abstract]

Investments

Fixed Maturity Securities

At September 30, 2013 and December 31, 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.

	September 30, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.8	$	206.7	$	4.3	$	1,223.2
States, Municipalities, and Political Subdivisions	1,675.5		131.2		36.9		1,769.8
Foreign Governments	1,203.1		174.2		2.0		1,375.3
Public Utilities	9,372.1		1,233.7		49.1		10,556.7
Mortgage/Asset-Backed Securities	1,947.0		216.0		1.4		2,161.6
All Other Corporate Bonds	22,935.7		2,731.0		193.9		25,472.8
Redeemable Preferred Stocks	33.0		5.2		—		38.2
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	287.6	$	42,597.6

	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

As of September 30, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	September 30, 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	$	42.0	$	2.1	$	5.4	$	2.2
States, Municipalities, and Political Subdivisions	336.3		31.1		37.2		5.8
Foreign Governments	32.4		2.0		—		—
Public Utilities	764.4		42.5		43.1		6.6
Mortgage/Asset-Backed Securities	47.9		0.9		3.1		0.5
All Other Corporate Bonds	3,136.5		175.6		197.1		18.3
Total Fixed Maturity Securities	$	4,359.5	$	254.2	$	285.9	$	33.4

	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.

	September 30, 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	$	882.7	$	15.8	$	874.5	$	0.1	$	23.9
Over 1 year through 5 years	7,027.3		728.5		7,629.0		2.2		124.6
Over 5 years through 10 years	9,052.5		1,003.4		8,094.1		88.7		1,873.1
Over 10 years	19,277.7		2,734.3		19,244.0		195.2		2,572.8
	36,240.2		4,482.0		35,841.6		286.2		4,594.4
Mortgage/Asset-Backed Securities	1,947.0		216.0		2,110.6		1.4		51.0
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	37,952.2	$	287.6	$	4,645.4

	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 September 30, 2013, the fair value of investment-grade fixed maturity securities was $39,456.0 million, with a gross unrealized gain of $4,567.9 million and a gross unrealized loss of $221.1 million. The gross unrealized loss on investment-grade fixed maturity securities was 76.9 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 September 30, 2013, the fair value of below-investment-grade fixed maturity securities was $3,141.6 million, with a gross unrealized gain of $130.1 million and a gross unrealized loss of $66.5 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 23.1 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 September 30, 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 September 30, 2013, we held 207 individual investment-grade fixed maturity securities and 62 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 14 investment-grade fixed maturity securities and 10 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

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 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.

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. For those fixed maturity securities with an unrealized loss for which we have not recognized an other-than-temporary impairment, we believe we will recover the entire amortized cost, we do not intend to sell the security, and we do not believe it is more likely than not we will be required to sell the security before recovery of its amortized cost. There have been no defaults in the repayment obligations of any securities for which we have not recorded an other-than-temporary impairment.

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.  The determination of cash flows is inherently subjective, and methodologies may vary depending on the circumstances specific to the security. The timing and amount of our cash flow estimates are developed using historical and forecast financial information from the issuer, including its current and projected liquidity position. We also consider industry analyst reports and forecasts, sector credit ratings, future business prospects and earnings trends, issuer refinancing capabilities, actual and/or potential asset sales by the issuer, and other data relevant to the collectibility of the contractual cash flows of the security. We take into account the probability of default, expected recoveries, third party guarantees, quality of collateral, and where our debt security ranks in terms of subordination. We may use the estimated fair value of collateral as a proxy for the present value of cash flows if we believe the security is dependent on the liquidation of collateral for recovery of our investment.  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.

At September 30, 2013, we had non-binding commitments of $44.2 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 September 30, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $461.0 million, comprised of $315.0 million of tax credit partnerships and $146.0 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 $41.9 million at September 30, 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 $120.5 million to fund certain private equity partnerships at September 30, 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 several partnership equity investments.  We contributed the bond and 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 partnerships 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.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond and partnerships were $135.6 million and $4.4 million, respectively, as of September 30, 2013.  The bonds are reported as fixed maturity securities, and the partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2013, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three and nine months ended September 30, 2013 and 2012.

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.

	September 30, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	70.4	4.0	%	$	47.2	2.7	%
Industrial	564.5		31.8		545.7		31.9
Office	732.4		41.2		721.2		42.1
Retail	408.8		23.0		398.6		23.3
Total	$	1,776.1	100.0	%	$	1,712.7	100.0	%

Region
New England	$	102.0	5.7	%	$	114.3	6.7	%
Mid-Atlantic	166.8		9.4		160.0		9.3
East North Central	241.0		13.6		224.7		13.1
West North Central	168.4		9.5		160.8		9.4
South Atlantic	433.9		24.4		440.9		25.7
East South Central	68.2		3.8		79.6		4.7
West South Central	202.4		11.4		159.5		9.3
Mountain	83.2		4.7		90.5		5.3
Pacific	310.2		17.5		282.4		16.5
Total	$	1,776.1	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:

	September 30 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	10.9	$	11.5
A	678.8		659.4
Baa	1,049.3		994.5
Ba	24.0		34.2
B	13.1		13.1
Total	$	1,776.1	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	771.8	$	624.7
> 65% <= 75%	816.0		858.8
> 75% <= 85%	121.9		142.5
> 85%	66.4		86.7
Total	$	1,776.1	$	1,712.7

Based on an analysis of the above risk factors, as well as other current information, 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. The projection of future cash flows and the determination of whether a borrower can make the contractual payments are inherently subjective, and methodologies may vary depending on the circumstances specific to a 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. 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:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5	$	1.5
Provision	—		1.3		—		1.8
Charge-offs, Net of Recoveries	—		—		—		(0.5		)
Balance at End of Period	$	1.5	$	2.8	$	1.5	$	2.8

Impaired mortgage loans are as follows:

	September 30, 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 $13.1 million and $15.5 million for the three and nine months ended September 30, 2013, respectively, and $15.9 million and $18.8 million for the three and nine months ended September 30, 2012, respectively. Interest income recognized on mortgage loans subsequent to impairment was $0.2 million and $0.6 million for the three and nine months ended September 30, 2013 and 2012, respectively.

There were no troubled debt restructurings during the three months ended September 30, 2013 and 2012. Our troubled debt restructurings during the nine months ended September 30, 2013 and 2012 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2013		2012
	(in millions of dollars)
Carrying Amount	$	4.3	$	13.1
Number of Loans	1		2

We had no realized losses on loan foreclosures for the three and nine months ended September 30, 2013 and 2012, other than the initial impairment losses recognized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At September 30, 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 the second quarter of 2013.

At September 30, 2013, we had non-binding commitments of $61.6 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 September 30, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $254.4 million, for which we received collateral in the form of cash and securities of $140.5 million and $124.1 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 September 30, 2013 or December 31, 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 5 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.

	September 30, 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	$	24.5	$	—	$	24.5	$	(22.8	)	$	(1.3	)	$	0.4
Securities Lending	254.4		—		254.4		(113.9		)	(140.5		)	—
Total	$	278.9	$	—	$	278.9	$	(136.7	)	$	(141.8	)	$	0.4
Financial Liabilities:
Derivatives	$	142.9	$	—	$	142.9	$	(112.3	)	$	—		$	30.6
Securities Lending	140.5		—		140.5		(140.5		)	—			—
Total	$	283.4	$	—	$	283.4	$	(252.8	)	$	—		$	30.6

	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:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	584.2	$	589.0	$	1,771.3	$	1,790.8
Derivative Financial Instruments	8.9		9.1		25.6		22.0
Mortgage Loans	28.5		25.5		81.6		76.5
Policy Loans	4.0		3.7		11.6		10.8
Other Long-term Investments	4.0		5.4		14.5		13.2
Short-term Investments	0.5		1.0		1.9		3.3
Gross Investment Income	630.1		633.7		1,906.5		1,916.6
Less Investment Expenses	7.2		6.3		21.1		20.3
Less Investment Income on Participation Fund Account Assets	3.9		4.1		11.8		12.1
Less Amortization of Tax Credit Partnerships	3.5		4.1		10.9		12.0
Net Investment Income	$	615.5	$	619.2	$	1,862.7	$	1,872.2

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.3		$	4.6		$	13.5		$	14.0
Gross Losses on Sales	(33.0		)	(2.3		)	(40.1		)	(9.0		)
Other-Than-Temporary Impairment Loss	—			—			(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	5.6			2.3			14.6			2.3
Impairment Loss	(1.0		)	(1.3		)	(2.0		)	(1.8		)
Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7			18.5			28.7
Other Derivatives	(1.0		)	—			(1.5		)	—
Foreign Currency Transactions	(0.7		)	(1.7		)	(4.7		)	(2.6		)
Net Realized Investment Gain (Loss)	$	(26.1	)	$	21.3		$	(2.5	)	$	31.6

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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, 2011		$ 35.9	$ 2,591.1	$ 461.8	$ 6,611.0	$ (1,530.1)
Common Stock Activity		0.1	13.1
Other Comprehensive Income (Loss)	328.5			328.5
Net Income	660.5				660.5
Dividends to Stockholders (per common share: $0.405; $0.340)					(98.1)
Purchases of Treasury Stock	(400.5)					(400.5)
Balance at End of Period at Sep. 30, 2012	8,673.3	36.0	2,604.2	790.3	7,173.4	(1,930.6)
Balance at Beginning of Year at Jun. 30, 2012
Other Comprehensive Income (Loss)	189.8
Net Income	230.2				230.2
Purchases of Treasury Stock	(100.2)
Balance at End of Period at Sep. 30, 2012	8,673.3				7,173.4
Balance at Beginning of Year at Dec. 31, 2012	8,612.6	36.0	2,607.7	628.0	7,371.6	(2,030.7)
Common Stock Activity		0	16.1
Other Comprehensive Income (Loss)	(218.4)			(218.4)
Net Income	636.9				636.9
Dividends to Stockholders (per common share: $0.405; $0.340)					(108.8)
Purchases of Treasury Stock	(268.5)					(268.5)
Balance at End of Period at Sep. 30, 2013	8,669.9	36.0	2,623.8	409.6	7,899.7	(2,299.2)
Balance at Beginning of Year at Jun. 30, 2013
Other Comprehensive Income (Loss)	192.9
Net Income	205.7				205.7
Purchases of Treasury Stock	(75.0)
Balance at End of Period at Sep. 30, 2013	$ 8,669.9				$ 7,899.7

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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	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Realized Investment Gain (Loss)
Gain (Loss) on Embedded Derivative	$ (0.3)	$ 19.7	$ 18.5	$ 28.7
Net Realized Investments Gain Loss
Net Realized Investment Gain (Loss)
Credit Default Swap Loss	(1.0)	0	(1.5)	0
Gain (Loss) on Embedded Derivative	(0.3)	19.7	18.5	28.7
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	$ (1.3)	$ 19.7	$ 17.0	$ 28.7

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Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Fixed Maturity Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	$ 0		$ 0		$ 0
Fair value of fixed maturity securities, gross unrealized gain	4,698,000,000		4,698,000,000		7,277,500,000
Fair Value of fixed maturity securities, gross unrealized loss	287,600,000		287,600,000		56,000,000
Defaults on securities not OTTI			0
Commitment to fund private placement fixed maturity securities	44,200,000		44,200,000
Carrying amount of variable interest entity investments	461,000,000		461,000,000
Unfunded commitment to fund Investment Partnerships	41,900,000		41,900,000
Commitment to fund partnership Equity Investments	120,500,000		120,500,000
Other Long-term Investments	564,500,000		564,500,000		625,000,000
Commitments to Fund Special Purpose Entities	0		0
Amount Funded to Special Purpose Entity Partnerships	nor did we fund any amounts to the partnership	nor did we fund any amounts to the partnerships	nor did we fund any amounts to the partnerships	nor did we fund any amounts to the partnerships
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%		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%		125.00%
Mortgage Loans issuance, term years	25		25
Number of Changes to Accounting Policy for Estimating Credit Losses on Mortgage Loans			0
Impaired Financing Receivable, Average Recorded Investment	13,100,000	15,900,000	15,500,000	18,800,000
Impaired Financing Receivable, Interest Income, Accrual Method	200,000	200,000	600,000	600,000
Foreclosed Real Estate Expense	0	0	0	0
Financing Receivable, Recorder Investment, Nonaccrual status	0		0		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due					4,300,000
Committments to Fund Commercial Mortgage Loans	61,600,000		61,600,000
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%		102.00%
Securities Loaned	254,400,000		254,400,000		452,800,000
Cash Collateral for Borrowed Securities	140,500,000		140,500,000		455,800,000
Securities Received as Collateral	(113,900,000)		(113,900,000)		0
Outstanding Repurchase Agreements	0		0		0
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Amount of days past due-DelinquentMortgageLoan	90 days		90 days		90 days
Off Balance Sheet Amount
Schedule of Investments [Line Items]
Securities Received as Collateral	124,100,000		124,100,000		14,500,000
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	315,000,000		315,000,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	146,000,000		146,000,000
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	39,456,000,000		39,456,000,000
Fair value of fixed maturity securities, gross unrealized gain	4,567,900,000		4,567,900,000
Fair Value of fixed maturity securities, gross unrealized loss	221,100,000		221,100,000
Fixed maturity securities in unrealized loss position, percent of total	76.90%		76.90%
Number of fixed maturity securities that were in an unrealized loss position	207		207
Number of fixed maturity securities in an unrealized loss position continuously for over one year	14		14
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	3,141,600,000		3,141,600,000
Fair value of fixed maturity securities, gross unrealized gain	130,100,000		130,100,000
Fair Value of fixed maturity securities, gross unrealized loss	66,500,000		66,500,000
Fixed maturity securities in unrealized loss position, percent of total	23.10%		23.10%
Number of fixed maturity securities that were in an unrealized loss position	62		62
Number of fixed maturity securities in an unrealized loss position continuously for over one year	10		10
Special Purpose Entity | Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	135,600,000		135,600,000
Special Purpose Entity | Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	$ 4,400,000		$ 4,400,000
Commercial Real Estate Portfolio Segment [Member] | Third Quarter [Member] [Domain]
Schedule of Investments [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0

XML

Fair Value of Financial Instruments Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,242.5		$ 3,242.5		$ 3,133.8
Long-term Debt	2,631.3		2,631.3		2,755.4
Gain (Loss) on Embedded Derivative	(0.3)	19.7	18.5	28.7
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	89.70%		89.70%
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	2,163.9		2,163.9		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	10.30%		10.30%
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	663.0		663.0		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	73.00%		73.00%
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	3.70%		3.70%
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	0.6		0.6		0
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	13.00%		13.00%
Ceded Policy Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,014.3		$ 3,014.3		$ 2,912.7

XML

Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2010	Sep. 30, 2011 insurers	Mar. 31, 2011 states
Commitments and Contingencies Disclosure [Line Items]
Interest on undrawn retained asset account funds		18.00%
Loss Contingency, Damages Awarded, Value	$ 12.1
Loss Contingency, Prejudgment Interest Awarded	$ 1.3
States involved in unclaimed property examination				33
Insurers requested to cross-check benefits			160

XML

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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue by Segment	$ 2,567.0	$ 2,606.7	$ 7,770.1	$ 7,825.6
Net Realized Investment Gain (Loss)	(26.1)	21.3	(2.5)	31.6
Revenue	2,540.9	2,628.0	7,767.6	7,857.2
Operating Income (Loss)	312.9	310.7	932.4	930.0
Net Realized Investment Gain (Loss)	(26.1)	21.3	(2.5)	31.6
Non-operating Retirement-related Loss	(2.7)	(11.6)	(30.5)	(34.8)
Income Tax Expense (Benefit)	(78.4)	(90.2)	(262.5)	(266.3)
Net Income	$ 205.7	$ 230.2	$ 636.9	$ 660.5

XML

Other Other

9 Months Ended

Sep. 30, 2013

Other [Abstract]

Other Item Disclosure [Text Block]

Debt

At September 30, 2013, short-term debt consisted entirely of securities lending agreements.

During the nine months ended September 30, 2013, we made principal payments of $45.0 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC.

In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured non-recourse notes issued by Tailwind Holdings, LLC, resulting in a before-tax gain of $4.0 million.

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. 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. At September 30, 2013, no amount was outstanding on the facility.

Income Tax

At September 30, 2013, we had a liability of $21.5 million for unrecognized tax benefits, $15.0 million of which is associated with deferred tax assets. The interest and penalties expense (benefit) related to unrecognized tax benefits in our consolidated statements of income was $0.1 million and $0.3 million for the three and nine months ended September 30, 2013, respectively, and less than $0.1 million and $(10.5) million for the three and nine months ended September 30, 2012, respectively.

During the third quarter of 2013, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from the current rate of 23 percent to 21 percent effective April 2014 and to 20 percent effective April 2015. During the third quarter of 2012, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 25 percent to 24 percent effective April 2012 and to 23 percent effective April 2013.  Deferred tax assets and liabilities are adjusted through income on the date of enactment of a rate change. We recorded a reduction of $6.3 million and $9.3 million in our income tax expense in the third quarter of 2013 and 2012, respectively.

XML

Segment Information

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate.

Premium income by major line of business within each of our segments is presented as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	385.0	$	392.4	$	1,172.5	$	1,185.7
Group Short-term Disability	129.5		120.1		389.6		356.0
Group Life and Accidental Death & Dismemberment
Group Life	305.2		297.3		911.0		885.1
Accidental Death & Dismemberment	30.5		29.2		91.6		86.2
Supplemental and Voluntary
Individual Disability - Recently Issued	114.9		119.9		349.3		357.0
Voluntary Benefits	159.5		153.0		481.8		468.9
	1,124.6		1,111.9		3,395.8		3,338.9
Unum UK
Group Long-term Disability	96.5		102.9		290.7		306.5
Group Life	25.6		56.4		83.1		164.6
Supplemental and Voluntary	15.2		15.9		44.9		48.0
	137.3		175.2		418.7		519.1
Colonial Life
Accident, Sickness, and Disability	185.0		181.8		554.5		541.8
Life	55.6		52.2		165.7		156.3
Cancer and Critical Illness	68.5		65.4		203.9		194.5
	309.1		299.4		924.1		892.6
Closed Block
Individual Disability	169.3		183.1		521.7		554.9
Long-term Care	157.0		159.4		473.6		471.5
All Other	—		0.4		0.1		1.9
	326.3		342.9		995.4		1,028.3
Total	$	1,897.3	$	1,929.4	$	5,734.0	$	5,778.9

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Three Months Ended September 30, 2013
Premium Income	$	1,124.6	$	137.3	$	309.1	$	326.3	$	—		$	1,897.3
Net Investment Income	233.1		30.3		36.3		315.4		0.4			615.5
Other Income	30.2		0.1		—		23.6		0.3			54.2
Operating Revenue	$	1,387.9	$	167.7	$	345.4	$	665.3	$	0.7		$	2,567.0
Operating Income (Loss)	$	219.8	$	31.3	$	69.0	$	25.7	$	(32.9	)	$	312.9
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Nine Months Ended September 30, 2013
Premium Income	$	3,395.8	$	418.7	$	924.1	$	995.4	$	—		$	5,734.0
Net Investment Income	699.9		106.5		110.3		944.6		1.4			1,862.7
Other Income	99.0		0.1		0.1		71.5		2.7			173.4
Operating Revenue	$	4,194.7	$	525.3	$	1,034.5	$	2,011.5	$	4.1		$	7,770.1
Operating Income (Loss)	$	641.9	$	96.1	$	215.5	$	82.6	$	(103.7	)	$	932.4
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income is presented as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,567.0		$	2,606.7		$	7,770.1		$	7,825.6
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Total Revenue	$	2,540.9		$	2,628.0		$	7,767.6		$	7,857.2
Operating Income by Segment	$	312.9		$	310.7		$	932.4		$	930.0
Net Realized Investment Gain (Loss)	(26.1		)	21.3			(2.5		)	31.6
Non-operating Retirement-related Loss	(2.7		)	(11.6		)	(30.5		)	(34.8		)
Income Tax	(78.4		)	(90.2		)	(262.5		)	(266.3		)
Net Income	$	205.7		$	230.2		$	636.9		$	660.5

Assets by segment are as follows:

	September 30		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	18,569.7	$	19,391.2
Unum UK	3,690.1		3,975.8
Colonial Life	3,435.4		3,434.9
Closed Block	31,651.2		33,069.2
Corporate	2,239.4		2,365.0
Total	$	59,585.8	$	62,236.1

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Investments (Tables)

9 Months Ended

Sep. 30, 2013

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At September 30, 2013 and December 31, 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.

	September 30, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.8	$	206.7	$	4.3	$	1,223.2
States, Municipalities, and Political Subdivisions	1,675.5		131.2		36.9		1,769.8
Foreign Governments	1,203.1		174.2		2.0		1,375.3
Public Utilities	9,372.1		1,233.7		49.1		10,556.7
Mortgage/Asset-Backed Securities	1,947.0		216.0		1.4		2,161.6
All Other Corporate Bonds	22,935.7		2,731.0		193.9		25,472.8
Redeemable Preferred Stocks	33.0		5.2		—		38.2
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	287.6	$	42,597.6

	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

As of September 30, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

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.

	September 30, 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	$	42.0	$	2.1	$	5.4	$	2.2
States, Municipalities, and Political Subdivisions	336.3		31.1		37.2		5.8
Foreign Governments	32.4		2.0		—		—
Public Utilities	764.4		42.5		43.1		6.6
Mortgage/Asset-Backed Securities	47.9		0.9		3.1		0.5
All Other Corporate Bonds	3,136.5		175.6		197.1		18.3
Total Fixed Maturity Securities	$	4,359.5	$	254.2	$	285.9	$	33.4

	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.

	September 30, 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	$	882.7	$	15.8	$	874.5	$	0.1	$	23.9
Over 1 year through 5 years	7,027.3		728.5		7,629.0		2.2		124.6
Over 5 years through 10 years	9,052.5		1,003.4		8,094.1		88.7		1,873.1
Over 10 years	19,277.7		2,734.3		19,244.0		195.2		2,572.8
	36,240.2		4,482.0		35,841.6		286.2		4,594.4
Mortgage/Asset-Backed Securities	1,947.0		216.0		2,110.6		1.4		51.0
Total Fixed Maturity Securities	$	38,187.2	$	4,698.0	$	37,952.2	$	287.6	$	4,645.4

	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.

	September 30, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	70.4	4.0	%	$	47.2	2.7	%
Industrial	564.5		31.8		545.7		31.9
Office	732.4		41.2		721.2		42.1
Retail	408.8		23.0		398.6		23.3
Total	$	1,776.1	100.0	%	$	1,712.7	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	102.0	5.7	%	$	114.3	6.7	%
Mid-Atlantic	166.8		9.4		160.0		9.3
East North Central	241.0		13.6		224.7		13.1
West North Central	168.4		9.5		160.8		9.4
South Atlantic	433.9		24.4		440.9		25.7
East South Central	68.2		3.8		79.6		4.7
West South Central	202.4		11.4		159.5		9.3
Mountain	83.2		4.7		90.5		5.3
Pacific	310.2		17.5		282.4		16.5
Total	$	1,776.1	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:

	September 30 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	10.9	$	11.5
A	678.8		659.4
Baa	1,049.3		994.5
Ba	24.0		34.2
B	13.1		13.1
Total	$	1,776.1	$	1,712.7

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio

Loan-to-Value Ratio
<= 65%	$	771.8	$	624.7
> 65% <= 75%	816.0		858.8
> 75% <= 85%	121.9		142.5
> 85%	66.4		86.7
Total	$	1,776.1	$	1,712.7

Activity in the Allowance for Credit Losses

The activity in the allowance for credit losses is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5	$	1.5
Provision	—		1.3		—		1.8
Charge-offs, Net of Recoveries	—		—		—		(0.5		)
Balance at End of Period	$	1.5	$	2.8	$	1.5	$	2.8

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	September 30, 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]

Our troubled debt restructurings during the nine months ended September 30, 2013 and 2012 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2013		2012
	(in millions of dollars)
Carrying Amount	$	4.3	$	13.1
Number of Loans	1		2

We had no realized losses on loan foreclosures for the three and nine months ended September 30, 2013 and 2012, 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.

	September 30, 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	$	24.5	$	—	$	24.5	$	(22.8	)	$	(1.3	)	$	0.4
Securities Lending	254.4		—		254.4		(113.9		)	(140.5		)	—
Total	$	278.9	$	—	$	278.9	$	(136.7	)	$	(141.8	)	$	0.4
Financial Liabilities:
Derivatives	$	142.9	$	—	$	142.9	$	(112.3	)	$	—		$	30.6
Securities Lending	140.5		—		140.5		(140.5		)	—			—
Total	$	283.4	$	—	$	283.4	$	(252.8	)	$	—		$	30.6

	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:

	Three Months Ended September 30				Nine Months Ended September 30
	2013		2012		2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	584.2	$	589.0	$	1,771.3	$	1,790.8
Derivative Financial Instruments	8.9		9.1		25.6		22.0
Mortgage Loans	28.5		25.5		81.6		76.5
Policy Loans	4.0		3.7		11.6		10.8
Other Long-term Investments	4.0		5.4		14.5		13.2
Short-term Investments	0.5		1.0		1.9		3.3
Gross Investment Income	630.1		633.7		1,906.5		1,916.6
Less Investment Expenses	7.2		6.3		21.1		20.3
Less Investment Income on Participation Fund Account Assets	3.9		4.1		11.8		12.1
Less Amortization of Tax Credit Partnerships	3.5		4.1		10.9		12.0
Net Investment Income	$	615.5	$	619.2	$	1,862.7	$	1,872.2

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:

	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.3		$	4.6		$	13.5		$	14.0
Gross Losses on Sales	(33.0		)	(2.3		)	(40.1		)	(9.0		)
Other-Than-Temporary Impairment Loss	—			—			(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	5.6			2.3			14.6			2.3
Impairment Loss	(1.0		)	(1.3		)	(2.0		)	(1.8		)
Embedded Derivative in Modified Coinsurance Arrangement	(0.3		)	19.7			18.5			28.7
Other Derivatives	(1.0		)	—			(1.5		)	—
Foreign Currency Transactions	(0.7		)	(1.7		)	(4.7		)	(2.6		)
Net Realized Investment Gain (Loss)	$	(26.1	)	$	21.3		$	(2.5	)	$	31.6

XML

Signficant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Significant Accounting Policies [Abstract]

Accounting Changes and Error Corrections

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 these updates effective January 1, 2012. The adoption of these updates 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.

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	UNM
Entity Registrant Name	Unum Group
Entity Central Index Key	0000005513
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		261,162,229

XML

Fair Values of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 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.

	September 30, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,597.6	$	42,597.6	$	44,973.0	$	44,973.0
Mortgage Loans	1,776.1		1,967.8		1,712.7		1,937.1
Policy Loans	3,242.5		3,312.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	24.5		24.5		81.6		81.6
Equity Securities	15.5		15.5		14.6		14.6
Miscellaneous Long-term Investments	465.4		465.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	634.2	$	634.2	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	554.2		554.2		535.5		535.5
Long-term Debt	2,631.3		2,827.5		2,755.4		2,968.8
Other Liabilities
Derivatives	142.9		142.9		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	65.4		65.4		83.9		83.9
Unfunded Commitments to Investment Partnerships	41.9		41.9		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:

	September 30, 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	$	135.1	$	1,088.1	$	—	$	1,223.2
States, Municipalities, and Political Subdivisions	—		1,617.9		151.9		1,769.8
Foreign Governments	—		1,296.7		78.6		1,375.3
Public Utilities	692.0		9,572.9		291.8		10,556.7
Mortgage/Asset-Backed Securities	—		2,161.1		0.5		2,161.6
All Other Corporate Bonds	3,541.4		20,718.9		1,212.5		25,472.8
Redeemable Preferred Stocks	—		14.1		24.1		38.2
Total Fixed Maturity Securities	4,368.5		36,469.7		1,759.4		42,597.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		22.5		—		22.5
Foreign Exchange Contracts	—		2.0		—		2.0
Total Derivatives	—		24.5		—		24.5
Equity Securities	—		11.1		4.4		15.5
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.8	$	—	$	33.8
Foreign Exchange Contracts	—		107.6		—		107.6
Credit Default Swaps	—		1.5		—		1.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		65.4		65.4
Total Derivatives	—		142.9		65.4		208.3

	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:

	Three Months Ended September 30
	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	$	21.7	$	164.6	$	426.8	$	60.5
States, Municipalities, and Political Subdivisions	—		31.8		43.0		62.9
Foreign Governments	—		—		21.7		—
Public Utilities	367.1		584.7		382.4		743.6
All Other Corporate Bonds	1,406.9		2,884.6		2,152.9		1,667.4
Total Fixed Maturity Securities	$	1,795.7	$	3,665.7	$	3,026.8	$	2,534.4
Equity Securities	$	—	$	—	$	—	$	7.4
	Nine Months Ended September 30
	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	$	48.0	$	—	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	—		53.1		41.9		74.8
Foreign Governments	—		—		20.7		—
Public Utilities	577.9		53.5		479.0		483.6
All Other Corporate Bonds	2,536.4		992.2		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,162.3	$	1,098.8	$	3,570.8	$	2,284.9

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:

	Three Months Ended September 30, 2013
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	152.0		$	—		$	(0.1	)	$	—	$	—		$	—	$	—		$	151.9
Foreign Governments	80.0			—			(1.4		)	—		—			—		—			78.6
Public Utilities	354.2			—			(5.2		)	—		—			144.1		(201.3		)	291.8
Mortgage/Asset-Backed Securities	14.9			(1.3		)	0.9			—		(14.0		)	—		—			0.5
All Other Corporate Bonds	1,042.5			(1.0		)	(2.5		)	7.0		(23.0		)	540.7		(351.2		)	1,212.5
Redeemable Preferred Stocks	24.2			—			(0.1		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,667.8			(2.3		)	(8.4		)	7.0		(37.0		)	684.8		(552.5		)	1,759.4
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(65.1		)	(0.3		)	—			—		—			—		—			(65.4		)
	Three Months Ended September 30, 2012
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)

	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	(8.4	)	$	—	$	(0.5	)	$	32.1	$	—		$	151.9
Foreign Governments	82.1			—			(3.5		)	—		—			—		—			78.6
Public Utilities	574.4			—			(19.4		)	—		(3.6		)	244.7		(504.3		)	291.8
Mortgage/Asset-Backed Securities	0.5			—			0.1			—		(0.1		)	—		—			0.5
All Other Corporate Bonds	1,177.8			1.1			(70.5		)	30.1		(86.9		)	807.4		(646.5		)	1,212.5
Redeemable Preferred Stocks	24.8			—			(0.7		)	—		—			—		—			24.1
Total Fixed Maturity Securities	1,988.3			1.1			(102.4		)	30.1		(91.1		)	1,084.2		(1,150.8		)	1,759.4
Equity Securities	4.3			—			0.1			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	18.5			—			—		—			—		—			(65.4		)
	Nine Months Ended September 30, 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 Period
															Into		Out of
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)

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. Gains and losses 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 period end were $(0.3) million and $18.5 million for the three and nine months ended September 30, 2013, respectively, and $19.7 million and $28.7 million for the three and nine months ended September 30, 2012, 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:

	September 30, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	118.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	66.5			- Volatility of Credit	(e)	0.50% - 0.75% / 0.59%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.23% - 5.33% / 5.31%
All Other Corporate Bonds - Private	234.2			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	2.71% - 2.71% / 2.71% (0.70)% - (0.40)% / (0.60)% 0.50% - 0.50% / 0.50% 0.20% - 1.00% / 0.55% 0.20% - 4.00% / 0.97% Priced at Par
All Other Corporate Bonds - Public	228.8			- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	(0.62)% - 1.00% / 0.27% 0.20% - 0.25% / 0.21% (0.84)% - 0.75% / (0.29)%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(65.4		)	- 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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Employee Benefit Plans Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 14.8	$ 12.2	$ 44.6	$ 36.6
Interest Cost	21.3	21.1	65.0	63.3
Expected Return on Plan Assets	(27.2)	(22.2)	(78.5)	(66.5)
Amortization of Net Actuarial Loss	2.3	11.5	29.4	34.4
Amortization of Prior Service Cost (Credit)	0.1	(0.1)	0.1	(0.4)
Curtailment Loss (Gain)	0	0	0.7	0
Total	11.3	22.5	61.3	67.4
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.0	1.2	3.2	3.6
Interest Cost	2.1	2.2	6.3	6.4
Expected Return on Plan Assets	(3.1)	(2.8)	(9.1)	(8.3)
Amortization of Net Actuarial Loss	0.4	0.1	1.1	0.4
Amortization of Prior Service Cost (Credit)	0	0	0	0
Curtailment Loss (Gain)	(3.7)	0	(3.7)	0
Total	(3.3)	0.7	(2.2)	2.1
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.2	0.4	0.6	1.2
Interest Cost	2.0	2.3	6.0	7.1
Expected Return on Plan Assets	(0.2)	(0.2)	(0.5)	(0.5)
Amortization of Net Actuarial Loss	0	0	0	0
Amortization of Prior Service Cost (Credit)	(1.2)	(0.6)	(3.7)	(1.9)
Curtailment Loss (Gain)	0	0	0	0
Total	$ 0.8	$ 1.9	$ 2.4	$ 5.9

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Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 59,585.8	$ 62,236.1
Unum U.S.
Segment Reporting Information [Line Items]
Assets	18,569.7	19,391.2
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,690.1	3,975.8
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,435.4	3,434.9
Closed Block
Segment Reporting Information [Line Items]
Assets	31,651.2	33,069.2
Corporate
Segment Reporting Information [Line Items]
Assets	$ 2,239.4	$ 2,365.0