10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2021

or

☐ 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 1-13754

THE HANOVER INSURANCE GROUP, INC.

(Exact name of registrant as specified in its charter)

Delaware	04-3263626
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

440 Lincoln Street, Worcester, Massachusetts 01653

(Address of principal executive offices) (Zip Code)

(508) 855-1000

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbols	Name of each exchange on which registered
Common Stock, $.01 par value	THG	New York Stock Exchange
7 5/8% Senior Debentures due 2025	THG	New York Stock Exchange

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  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

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

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

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

The number of shares outstanding of the registrant’s common stock was 35,896,848 as of April 28, 2021.

TABLE OF CONTENTS

PART I.	FINANCIAL INFORMATION	2
Item 1.	Financial Statements	2
	Consolidated Statements of Income	2
	Consolidated Statements of Comprehensive Income	3
	Consolidated Balance Sheets	4
	Consolidated Statements of Shareholders’ Equity	5
	Consolidated Statements of Cash Flows	6
	Notes to Interim Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	39
Item 4.	Controls and Procedures	39
PART II.	OTHER INFORMATION	40
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 6.	Exhibits	43
SIGNATURES		44

PART I - FINANCIAL INFORMATION

ITEM 1 - FINANCIAL STATEMENTS

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

	Three Months Ended
	March 31,
(In millions, except per share data)	2021			2020
Revenues
Premiums	$	1,161.8		$	1,141.4
Net investment income		76.8			69.6
Net realized and unrealized investment gains (losses):
Net realized gains (losses) from sales and other		(1.6	)		3.1
Net change in fair value of equity securities		39.1			(136.2	)
Impairment losses on investments		—			(28.5	)
Total net realized and unrealized investment gains (losses)		37.5			(161.6	)
Fees and other income		7.2			6.8
Total revenues		1,283.3			1,056.2
Losses and expenses
Losses and loss adjustment expenses		781.3			728.2
Amortization of deferred acquisition costs		240.3			236.9
Interest expense		8.5			9.4
Other operating expenses		139.1			135.6
Total losses and expenses		1,169.2			1,110.1
Income (loss) from continuing operations before income taxes		114.1			(53.9	)
Income tax expense (benefit):
Current		8.9			21.3
Deferred		12.4			(36.5	)
Total income tax expense (benefit)		21.3			(15.2	)
Income (loss) from continuing operations		92.8			(38.7	)
Discontinued operations (net of taxes):
Loss from discontinued life businesses		(0.1	)		(1.3	)
Net income (loss)	$	92.7		$	(40.0	)
Earnings per common share:
Basic:
Income (loss) from continuing operations	$	2.55		$	(1.01	)
Discontinued operations (net of taxes):
Loss from discontinued life businesses		—			(0.03	)
Net income (loss) per share	$	2.55		$	(1.04	)
Weighted average shares outstanding		36.4			38.3
Diluted:
Income (loss) from continuing operations	$	2.52		$	(1.01	)
Discontinued operations (net of taxes):
Loss from discontinued life businesses		(0.01	)		(0.03	)
Net income (loss) per share	$	2.51		$	(1.04	)
Weighted average shares outstanding		36.9			38.3

The accompanying notes are an integral part of these interim consolidated financial statements.

2

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

	Three Months Ended
	March 31,
(In millions)	2021			2020
Net income (loss)	$	92.7		$	(40.0	)
Other comprehensive income (loss), net of tax:
Available-for-sale securities:
Changes in net unrealized losses on investment securities:
Having no credit losses recognized in the    Consolidated Statements of Income		(185.5	)		(70.8	)
Having credit losses recognized in the    Consolidated Statements of Income		—			(12.4	)
Total available-for-sale securities		(185.5	)		(83.2	)
Pension and postretirement benefits:
Net change in net actuarial loss		0.7			1.2
Total other comprehensive loss, net of tax		(184.8	)		(82.0	)
Comprehensive loss	$	(92.1	)	$	(122.0	)

The accompanying notes are an integral part of these interim consolidated financial statements.

3

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

	March 31,			December 31,
(In millions, except share data)	2021			2020
Assets
Investments:
Fixed maturities, at fair value (amortized cost of $7,089.1 and $6,945.6)	$	7,370.3		$	7,454.4
Equity securities, at fair value		641.0			598.5
Other investments		793.2			793.2
Total investments		8,804.5			8,846.1
Cash and cash equivalents		112.1			120.6
Accrued investment income		48.0			51.2
Premiums and accounts receivable, net		1,369.6			1,339.3
Reinsurance recoverable on paid and unpaid losses and unearned premiums		1,882.9			1,874.3
Deferred acquisition costs		491.0			477.5
Goodwill		178.8			178.8
Other assets		461.5			445.7
Assets of discontinued businesses		99.6			110.2
Total assets	$	13,448.0		$	13,443.7
Liabilities
Loss and loss adjustment expense reserves	$	6,223.7		$	6,024.0
Unearned premiums		2,553.1			2,482.7
Expenses and taxes payable		601.8			687.5
Deferred income tax liability		64.0			97.3
Reinsurance premiums payable		57.3			48.4
Debt		781.0			780.8
Liabilities of discontinued businesses		120.3			120.8
Total liabilities		10,401.2			10,241.5
Commitments and contingencies
Shareholders’ Equity
Preferred stock, par value $0.01 per share; 20.0 million shares authorized; none issued		—			—
Common stock, par value $0.01 per share; 300.0 million shares authorized;    60.5 million shares issued		0.6			0.6
Additional paid-in capital		1,864.0			1,857.4
Accumulated other comprehensive income		187.7			372.5
Retained earnings		2,734.9			2,668.0
Treasury stock at cost (24.3 million and 24.1 million shares)		(1,740.4	)		(1,696.3	)
Total shareholders’ equity		3,046.8			3,202.2
Total liabilities and shareholders’ equity	$	13,448.0		$	13,443.7

The accompanying notes are an integral part of these interim consolidated financial statements.

4

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (UNAUDITED)

	Three Months Ended
	March 31,
(In millions)	2021			2020
Preferred Stock
Balance at beginning and end of period	$	—		$	—
Common Stock
Balance at beginning and end of period		0.6			0.6
Additional Paid-in Capital
Balance at beginning of period		1,857.4			1,837.3
Settlement and prepayment of accelerated share    repurchases and other		6.6			24.3
Balance at end of period		1,864.0			1,861.6
Accumulated Other Comprehensive Income, net of tax
Net Unrealized Appreciation (Depreciation) on Investments:
Balance at beginning of period		428.1			216.0
Net depreciation on available-for-sale securities		(185.5	)		(83.2	)
Balance at end of period		242.6			132.8
Defined Benefit Pension and Postretirement Plans:
Balance at beginning of period		(55.6	)		(63.4	)
Net amount recognized as net periodic benefit cost		0.7			1.2
Balance at end of period		(54.9	)		(62.2	)
Total accumulated other comprehensive income		187.7			70.6
Retained Earnings
Balance at beginning of period		2,668.0			2,410.9
Cumulative effect of accounting change, net of taxes		—			(0.9	)
Balance at beginning of period, as adjusted		2,668.0			2,410.0
Net income (loss)		92.7			(40.0	)
Dividends to shareholders		(25.8	)		(25.1	)
Balance at end of period		2,734.9			2,344.9
Treasury Stock
Balance at beginning of period		(1,696.3	)		(1,485.2	)
Shares purchased at cost		(50.3	)		(59.2	)
Net shares reissued at cost under employee stock-based    compensation plans		6.2			3.3
Balance at end of period		(1,740.4	)		(1,541.1	)
Total shareholders’ equity	$	3,046.8		$	2,736.6

The accompanying notes are an integral part of these interim consolidated financial statements.

5

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

	Three Months Ended
	March 31,
(In millions)	2021			2020
Cash Flows From Operating Activities
Net income (loss)	$	92.7		$	(40.0	)
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized and unrealized investment (gains) losses		(38.3	)		162.4
Net amortization and depreciation		3.8			5.1
Stock-based compensation expense		5.6			5.0
Amortization of defined benefit plan costs		0.8			1.5
Deferred income tax expense (benefit)		12.6			(36.7	)
Change in deferred acquisition costs		(13.5	)		1.7
Change in premiums receivable, net of reinsurance premiums payable		(21.3	)		(5.5	)
Change in loss, loss adjustment expense and unearned premium reserves		270.5			75.0
Change in reinsurance recoverable		(8.5	)		(6.4	)
Change in expenses and taxes payable		(143.6	)		(112.7	)
Other, net		(19.0	)		(12.8	)
Net cash provided by operating activities		141.8			36.6
Cash Flows From Investing Activities
Proceeds from disposals and maturities of fixed maturities		528.0			316.3
Proceeds from disposals of equity securities and other investments		66.5			73.2
Purchase of fixed maturities		(617.2	)		(376.5	)
Purchase of equity securities and other investments		(53.6	)		(109.7	)
Capital expenditures		(2.3	)		(3.2	)
Net cash used in investing activities		(78.6	)		(99.9	)
Cash Flows From Financing Activities
Proceeds from exercise of employee stock options		5.8			3.0
Proceeds from short-term borrowings		—			54.0
Dividends paid to shareholders		(25.5	)		(24.8	)
Repurchases of common stock		(45.3	)		(34.9	)
Other financing activities		(6.7	)		(5.8	)
Net cash used in financing activities		(71.7	)		(8.5	)
Net change in cash and cash equivalents		(8.5	)		(71.8	)
Cash and cash equivalents, beginning of period		120.6			215.7
Cash and cash equivalents, end of period	$	112.1		$	143.9

The accompanying notes are an integral part of these interim consolidated financial statements.

6

THE HANOVER INSURANCE GROUP, INC. AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. Basis of Presentation and Principles of Consolidation

The accompanying unaudited consolidated financial statements of The Hanover Insurance Group, Inc. and its subsidiaries (“THG” or the “Company”) have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the requirements of Form 10-Q. Certain financial information that is provided in annual financial statements, but is not required in interim reports, has been omitted.

The interim consolidated financial statements of THG include the accounts of The Hanover Insurance Company (“Hanover Insurance”) and Citizens Insurance Company of America, THG’s principal property and casualty insurance companies; and other insurance and non-insurance subsidiaries. These legal entities conduct their operations through several business segments discussed in Note 8 – “Segment Information.” The interim consolidated financial statements also include the Company’s discontinued operations, consisting of the Company’s former accident and health and life insurance businesses. All intercompany accounts and transactions have been eliminated.

The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amount of revenues and expenses during the reporting period. Actual results could differ from those estimates.

In the opinion of the Company’s management, the accompanying interim consolidated financial statements reflect all adjustments, consisting of normal recurring items, necessary for a fair presentation of the financial position and results of operations. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 24, 2021.

2. New Accounting Pronouncements

Recently Implemented Standards

In October 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Codification (“ASC”) Update No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables – Nonrefundable Fees and Other Costs. This guidance clarifies, for each reporting period, that an entity should reevaluate whether a callable debt security with multiple call dates is required to amortize any premium to the next call date. The updated guidance is effective for annual and interim periods beginning after December 15, 2020 and should be applied on a prospective basis as of the beginning of the period of adoption for existing or newly purchased callable debt securities. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.

In January 2020, the FASB issued ASC Update No. 2020-01, Investments – Equity Securities (Topic 321), Investments – Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815). This ASC update clarifies that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting when using the measurement alternative under ASC 321. This update also clarifies the accounting for certain forward contracts and purchased options accounted for under ASC 815. The updated guidance is effective for annual and interim periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.  

In December 2019, the FASB issued ASC Update No. 2019-12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes. This ASC update removes certain exceptions to the general principles in ASC 740, Income Taxes, including intraperiod tax allocation when there is a loss from continuing operations, foreign subsidiary treatment under certain conditions and for calculating interim income taxes when the year-to-date loss exceeds the anticipated loss. This update also clarifies and amends existing guidance related to changes in tax laws, business combinations and employee stock plans, among others. The updated guidance is effective for interim and annual periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.   

7

3. Investments

A. Fixed maturities

The amortized cost and fair value of available-for-sale fixed maturities were as follows:

	March 31, 2021
					Amortized Cost,
			Allowance		Net of Allowance		Gross		Gross
	Amortized		for Credit		for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses		Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	360.7	$	—	$	360.7	$	11.1	$	12.1	$	359.7
Foreign government		2.2		—		2.2		0.4		—		2.6
Municipal		1,046.3		—		1,046.3		38.5		11.7		1,073.1
Corporate		3,908.6		—		3,908.6		227.5		20.9		4,115.2
Residential mortgage-backed		981.5		—		981.5		23.1		10.4		994.2
Commercial mortgage-backed		722.8		—		722.8		36.7		3.0		756.5
Asset-backed		67.0		—		67.0		2.0		—		69.0
Total fixed maturities	$	7,089.1	$	—	$	7,089.1	$	339.3	$	58.1	$	7,370.3

	December 31, 2020
						Amortized Cost,
			Allowance			Net of Allowance		Gross		Gross
	Amortized		for Credit			for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses			Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	376.4	$	—		$	376.4	$	17.6	$	2.0	$	392.0
Foreign government		2.2		—			2.2		0.5		—		2.7
Municipal		1,042.1		—			1,042.1		61.7		0.1		1,103.7
Corporate		3,770.0		(0.1	)		3,769.9		341.8		0.4		4,111.3
Residential mortgage-backed		978.2		—			978.2		33.1		0.6		1,010.7
Commercial mortgage-backed		705.4		—			705.4		54.8		0.2		760.0
Asset-backed		71.4		—			71.4		2.6		—		74.0
Total fixed maturities	$	6,945.7	$	(0.1	)	$	6,945.6	$	512.1	$	3.3	$	7,454.4

The Company deposits funds with various state and governmental authorities. For a discussion of the Company’s deposits with state and governmental authorities, see also Note 3 – “Investments” in the Notes to Consolidated Financial Statements in the Company’s 2020 Annual Report on Form 10-K.  

The amortized cost and fair value by maturity periods for fixed maturities are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, or the Company may have the right to put or sell the obligations back to the issuers.

	March 31, 2021
	Amortized Cost, Net
	of Allowance for		Fair
(in millions)	Credit Losses		Value
Due in one year or less	$	273.7	$	277.3
Due after one year through five years		1,820.5		1,945.4
Due after five years through ten years		2,461.1		2,575.1
Due after ten years		762.5		752.8
		5,317.8		5,550.6
Mortgage-backed and asset-backed securities		1,771.3		1,819.7
Total fixed maturities	$	7,089.1	$	7,370.3

8

B. Fixed maturity securities in an unrealized loss position

The following tables provide information about the Company’s available-for-sale fixed maturity securities that were in an unrealized loss position at March 31, 2021 and December 31, 2020, including the length of time the securities have been in an unrealized loss position:

	March 31, 2021
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	12.1	$	171.5	$	—	$	—	$	12.1	$	171.5
Municipal		11.7		372.9		—		0.5		11.7		373.4
Corporate		19.5		515.1		—		—		19.5		515.1
Residential mortgage-backed		10.4		405.2		—		0.1		10.4		405.3
Commercial mortgage-backed		3.0		84.1		—		1.0		3.0		85.1
Asset-backed		—		4.6		—		—		—		4.6
Total investment grade		56.7		1,553.4		—		1.6		56.7		1,555.0
Below investment grade:
Corporate		1.4		64.6		—		—		1.4		64.6
Total fixed maturities	$	58.1	$	1,618.0	$	—	$	1.6	$	58.1	$	1,619.6

	December 31, 2020
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	2.0	$	140.7	$	—	$	—	$	2.0	$	140.7
Municipal		0.1		19.3		—		0.7		0.1		20.0
Corporate		0.4		53.4		—		—		0.4		53.4
Residential mortgage-backed		0.6		94.4		—		—		0.6		94.4
Commercial mortgage-backed		0.2		33.2		—		—		0.2		33.2
Total investment grade		3.3		341.0		—		0.7		3.3		341.7
Below investment grade:
Corporate		—		4.6		—		—		—		4.6
Total fixed maturities	$	3.3	$	345.6	$	—	$	0.7	$	3.3	$	346.3

The Company views gross unrealized losses on fixed maturities as non-credit related and through its assessment of unrealized losses has determined that these securities will recover, allowing the Company to realize the anticipated long-term economic value. The Company currently does not intend to sell, nor does it expect to be required to sell these securities before recovery of their amortized cost. The Company employs a systematic methodology to evaluate declines in fair value below amortized cost for fixed maturity securities. In determining impairments, the Company evaluates several factors and circumstances, including the issuer’s overall financial condition; the issuer’s credit and financial strength ratings; the issuer’s financial performance, including earnings trends and asset quality; any specific events which may influence the operations of the issuer; the general outlook for market conditions in the industry or geographic region in which the issuer operates; and the degree to which the fair value of an issuer’s securities is below the Company’s amortized cost. The Company also considers any factors that might raise doubt about the issuer’s ability to make contractual payments as they come due and whether the Company expects to recover the entire amortized cost basis of the security.

9

C. Proceeds from sales

The proceeds from sales of available-for-sale fixed maturities and gross realized gains and gross realized losses on those sales were as follows:

	Three Months Ended March 31,
	2021		2020
(in millions)
Proceeds from sales	$	217.4	$	66.0
Gross gains		2.9		2.7
Gross losses		7.2		0.4

D. Impairments

For the three months ended March 31, 2021, the Company did not recognize any impairments. For the three months ended March 31, 2020, the Company recognized $28.5 million of impairment losses, consisting primarily of $22.2 million on fixed maturities and $4.8 million on mortgage loans. Impairments on fixed maturities included $16.0 million categorized as intend-to-sell and $6.2 million of credit-related losses.    

At March 31, 2021 and December 31, 2020, the allowance for credit losses on mortgage loans was $7.9 million.  At March 31, 2021, there was no allowance for credit losses on available-for-sale securities and at December 31, 2020, the allowance for credit losses on available-for-sale securities was $0.1 million.  

The methodology and significant inputs used to measure the amount of credit losses were as follows:

Fixed maturities, Corporate bonds – the Company utilized a financial model that derives expected cash flows based on probability-of-default factors by credit rating and asset duration, and loss-given-default factors based on security type. These factors are based on historical data provided by an independent third-party rating agency. In addition, other qualitative market data relevant to the realizability of contractual cash flows may be considered, including current conditions and reasonable and supportable forecasts.

Mortgage loans – the Company estimated losses by applying expected loss rates, which are based on historical data. Embedded in expected loss rates are mortgage risk ratings and risk factors associated with property type such as office, retail, lodging, multi-family and industrial. Risk ratings, based on property characteristics and metrics including the geographic market, are predominantly driven by estimates of loan-to-value and debt service coverage ratios. Ratings may be adjusted to reflect current conditions and to incorporate reasonable and supportable forecasts, such as volatility of cash flows and valuation.

E. Equity securities

Equity securities are carried at fair value and all increases or decreases in fair value are reported in net realized and unrealized investment gains (losses) on the Consolidated Statements of Income. The following table provides pre-tax net realized and unrealized gains (losses) on equity securities:

	Three Months Ended March 31,
(in millions)		2021		2020
Net gains (losses) recognized during the period	$	39.1	$	(136.2	)
Less: net gains (losses) recognized on equity securities sold    during the period		0.6		(0.6	)
Net unrealized gains (losses) recognized during the period on equity    securities still held	$	38.5	$	(135.6	)

4. Fair Value

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability, i.e., exit price, in an orderly transaction between market participants. The Company emphasizes the use of observable market data whenever available in determining fair value. Fair values presented for certain financial instruments are estimates which, in many cases, may differ significantly from the amounts that could be realized upon immediate liquidation. A hierarchy of the three broad levels of fair value is as follows, with the highest priority given to Level 1 as these are the most observable, and the lowest priority given to Level 3:

Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.

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Level 2 – Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data, including model-derived valuations.

Level 3 – Unobservable inputs that are supported by little or no market activity.

When more than one level of input is used to determine fair value, the financial instrument is classified as Level 2 or 3 according to the lowest level input that has a significant impact on the fair value measurement.

The following methods and assumptions were used to estimate the fair value of each class of financial instruments and have not changed since last year.

Fixed Maturities

Level 1 securities generally include U.S. Treasury issues and other securities that are highly liquid, and for which quoted market prices are available. Level 2 securities are valued using pricing for similar securities and pricing models that incorporate observable inputs including, but not limited to yield curves and issuer spreads. Level 3 securities include issues for which little observable data can be obtained, primarily due to the illiquid nature of the securities, and for which significant inputs used to determine fair value are based on the Company’s own assumptions.

The Company utilizes a third-party pricing service for the valuation of the majority of its fixed maturity securities and receives one quote per security. When quoted market prices in an active market are available, they are provided by the pricing service as the fair value and such values are classified as Level 1. Since fixed maturities other than U.S. Treasury securities generally do not trade on a daily basis, the pricing service prepares estimates of fair value for those securities using pricing techniques based on a market approach. Inputs into the fair value pricing common to all asset classes include: benchmark U.S. Treasury security yield curves; reported trades of identical or similar fixed maturity securities; broker/dealer quotes of identical or similar fixed maturity securities and structural characteristics such as maturity date, coupon, mandatory principal payment dates, frequency of interest and principal payments, and optional redemption features. Inputs into the fair value applications that are unique by asset class include, but are not limited to:

• U.S. government agencies – determination of direct versus indirect government support and whether any contingencies exist with respect to the timely payment of principal and interest.

• Foreign government – estimates of appropriate market spread versus underlying related sovereign treasury curve(s) dependent on liquidity and direct or contingent support.

• Municipals – overall credit quality, including assessments of the level and variability of: sources of payment such as income, sales or property taxes, levies or user fees; credit support such as insurance; state or local economic and political base; natural resource availability; and susceptibility to natural or man-made catastrophic events such as hurricanes, earthquakes or acts of terrorism.

• Corporate fixed maturities – overall credit quality, including assessments of the level and variability of: economic sensitivity; liquidity; corporate financial policies; management quality; regulatory environment; competitive position; ownership; restrictive covenants; and security or collateral.

• Residential mortgage-backed securities – estimates of prepayment speeds based upon: historical prepayment rate trends; underlying collateral interest rates; geographic concentration; vintage year; borrower credit quality characteristics; interest rate and yield curve forecasts; government or monetary authority support programs; tax policies; and delinquency/default trends.

• Commercial mortgage-backed securities – overall credit quality, including assessments of the value and supply/demand characteristics of: collateral type such as office, retail, residential, lodging, or other; geographic concentration by region, state, metropolitan statistical area and locale; vintage year; historical collateral performance including defeasance, delinquency, default and special servicer trends; and capital structure support features.

• Asset-backed securities – overall credit quality, including assessments of the underlying collateral type such as credit card receivables, automobile loan receivables and equipment lease receivables; geographic diversification; vintage year; historical collateral performance including delinquency, default and casualty trends; economic conditions influencing use rates and resale values; and contract structural support features.

Generally, all prices provided by the pricing service, except actively traded securities with quoted market prices, are reported as Level 2.

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The Company holds privately placed fixed maturity securities and certain other fixed maturity securities that do not have an active market and for which the pricing service cannot provide fair values. The Company determines fair values for these securities using either matrix pricing utilizing the market approach or broker quotes. The Company will use observable market data as inputs into the fair value techniques, as discussed in the determination of Level 2 fair values, to the extent it is available, but is also required to use a certain amount of unobservable judgment due to the illiquid nature of the securities involved. Unobservable judgment reflected in the Company’s matrix model accounts for estimates of additional spread required by market participants for factors such as issue size, credit stress, structural complexity, high bond coupon or other unique features. These matrix-priced securities are reported as Level 2 or Level 3, depending on the significance of the impact of unobservable judgment on the security’s value. Additionally, the Company may obtain non-binding broker quotes which are reported as Level 3.

Equity Securities

Level 1 consists of publicly traded securities, including exchange traded funds, valued at quoted market prices. Level 2 includes securities that are valued using pricing for similar securities and pricing models that incorporate observable inputs. Level 3 consists of common or preferred stock of private companies for which observable inputs are not available.

The Company utilizes a third-party pricing service for the valuation of the majority of its equity securities and receives one quote for each equity security. When quoted market prices in an active market are available, they are provided by the pricing service as the fair value and such values are classified as Level 1. The Company holds certain equity securities that have been issued by privately-held entities that do not have an active market and for which the pricing service cannot provide fair values. Generally, the Company estimates fair value for these securities based on the issuer’s book value and market multiples and reports them as Level 3. Additionally, the Company may obtain non-binding broker quotes which are reported as Level 3.

Other Investments

Other investments primarily include mortgage participations and limited partnerships not subject to the equity method of accounting. The fair values of limited partnerships not subject to the equity method of accounting are based on the net asset value (“NAV”) provided by the general partner adjusted for recent financial information and are excluded from the fair value hierarchy.

The estimated fair values of the financial instruments were as follows:

	March 31, 2021				December 31, 2020
	Carrying		Fair		Carrying		Fair
(in millions)	Value		Value		Value		Value
Financial Assets carried at:
Fair Value through AOCI:
Fixed maturities	$	7,370.3	$	7,370.3	$	7,454.4	$	7,454.4
Fair Value through Net Income:
Equity securities		641.0		641.0		598.5		598.5
Other investments		176.9		176.9		176.8		176.8
Amortized Cost/Cost:
Other investments		459.7		489.9		470.3		504.8
Cash and cash equivalents		112.1		112.1		120.6		120.6
Total financial instruments	$	8,760.0	$	8,790.2	$	8,820.6	$	8,855.1
Financial Liabilities carried at:
Amortized Cost:
Debt	$	781.0	$	858.7	$	780.8	$	887.7

The Company has processes designed to ensure that the values received from its third-party pricing services are accurately recorded, that the data inputs and valuation approaches and techniques utilized are appropriate and consistently applied, and that the assumptions are reasonable and consistent with the objective of determining fair value. The Company reviews the pricing services’ policies describing its methodology, processes, practices and inputs, including various financial models used to value securities. For assets carried at fair value, the Company performs a review of the fair value hierarchy classifications and of prices received from its pricing service on a quarterly basis. Also, the Company reviews the portfolio pricing, including a process for which securities with changes in prices that exceed a defined threshold are verified to independent sources, if available. If upon review, the Company is not satisfied with the validity of a given price, a pricing challenge would be submitted to the pricing service along with supporting documentation for its review. The Company does not adjust quotes or prices obtained from the pricing service unless the pricing service agrees with the Company’s challenge. During the first three months of 2021 and 2020, the Company did not adjust any prices received from its pricing service.

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Changes in the observability of valuation inputs may result in a reclassification of certain financial assets or liabilities within the fair value hierarchy. As previously discussed, the Company utilizes a third-party pricing service for the valuation of the majority of its fixed maturities and equity securities. The pricing service has indicated that it will only produce an estimate of fair value if there is objectively verifiable information to produce a valuation. If the pricing service discontinues pricing an investment, the Company will use observable market data to the extent it is available, but may also be required to make assumptions for market-based inputs that are unavailable due to market conditions.

The following tables provide, for each hierarchy level, the Company’s investment assets that were measured at fair value on a recurring basis.

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	359.7	$	155.3	$	204.4	$	—
Foreign government		2.6		—		2.6		—
Municipal		1,073.1		—		1,066.9		6.2
Corporate		4,115.2		—		4,114.8		0.4
Residential mortgage-backed		994.2		—		994.2		—
Commercial mortgage-backed		756.5		—		744.7		11.8
Asset-backed		69.0		—		69.0		—
Total fixed maturities		7,370.3		155.3		7,196.6		18.4
Equity securities		641.0		635.4		—		5.6
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,015.3	$	790.7	$	7,196.6	$	28.0

	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	392.0	$	155.8	$	236.2	$	—
Foreign government		2.7		—		2.7		—
Municipal		1,103.7		—		1,096.7		7.0
Corporate		4,111.3		—		4,110.8		0.5
Residential mortgage-backed		1,010.7		—		1,010.7		—
Commercial mortgage-backed		760.0		—		747.6		12.4
Asset-backed		74.0		—		74.0		—
Total fixed maturities		7,454.4		155.8		7,278.7		19.9
Equity securities		598.5		593.0		—		5.5
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,056.9	$	748.8	$	7,278.7	$	29.4

Limited partnerships measured at fair value using NAV based on an ownership interest in partners’ capital have not been included in the hierarchy tables. At March 31, 2021 and December 31, 2020, the fair values of these investments were $172.9 million and $172.8 million, respectively, approximately 2% of total investment assets.

The following tables provide, for each hierarchy level, the Company’s estimated fair values of financial instruments that were not carried at fair value:

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	112.1	$	112.1	$	—	$	—
Other investments		489.9		—		2.7		487.2
Total financial instruments	$	602.0	$	112.1	$	2.7	$	487.2
Liabilities:
Debt	$	858.7	$	—	$	858.7	$	—

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	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	120.6	$	120.6	$	—	$	—
Other investments		504.8		—		2.7		502.1
Total financial instruments	$	625.4	$	120.6	$	2.7	$	502.1
Liabilities:
Debt	$	887.7	$	—	$	887.7	$	—

The tables below provide reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	Fixed Maturities
(in millions)	Municipal			Corporate			Commercial mortgage- backed			Total			Equity and Other		Total Assets
Three Months Ended March 31, 2021
Balance January 1, 2021	$	7.0		$	0.5		$	12.4		$	19.9		$	9.5	$	29.4
Total gains (losses):
Included in total net realized and      unrealized investment gains		—			—			—			—			0.1		0.1
Included in other comprehensive loss-net depreciation on available-for-sale securities		—			—			(0.4	)		(0.4	)		—		(0.4	)
Sales		(0.8	)		(0.1	)		(0.2	)		(1.1	)		—		(1.1	)
Balance March 31, 2021	$	6.2		$	0.4		$	11.8		$	18.4		$	9.6	$	28.0
Change in unrealized losses for the period    included in other comprehensive loss for    assets held at the end of the period	$	—		$	—		$	(0.4	)	$	(0.4	)	$	—	$	(0.4	)
Three Months Ended March 31, 2020
Balance January 1, 2020	$	12.1		$	0.6		$	12.7		$	25.4		$	5.6	$	31.0
Total  gains (losses):
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities		0.1			—			(0.4	)		(0.3	)		—		(0.3	)
Sales		(0.8	)		(0.1	)		(0.5	)		(1.4	)		—		(1.4	)
Balance March 31, 2020	$	11.4		$	0.5		$	11.8		$	23.7		$	5.6	$	29.3
Change in unrealized gains (losses) for the period    included in other comprehensive loss for    assets held at the end of the period	$	0.1		$	—		$	(0.4	)	$	(0.3	)	$	—	$	(0.3	)

There were no transfers between Level 2 and Level 3, and there were no Level 3 liabilities held by the Company for the three months ended March 31, 2021 and 2020.

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The following table provides quantitative information about the significant unobservable inputs used by the Company in the fair value measurements of Level 3 assets. Where discounted cash flows were used in the valuation of fixed maturities, the internally-developed discount rate was adjusted by the significant unobservable inputs shown in the table.    

			March 31, 2021			December 31, 2020
	Valuation	Significant	Fair		Range	Fair		Range
(in millions)	Technique	Unobservable Inputs	Value		(Wtd Average)	Value		(Wtd Average)
Fixed maturities:
Municipal	Discounted cash flow	Discount for:    Small issue size    Credit stress	$	6.2	0.7 - 6.8% (5.0%) 0.2% (0.2%)	$	7.0	0.7 - 6.8% (5.0%) 0.2% (0.2%)
Corporate	Discounted cash flow	Discount for:    Small issue size    Above-market coupon	0.4		2.5% (2.5%) 0.3% (0.3%)	0.5		2.5% (2.5%) 0.3% (0.3%)
Commercial    mortgage-backed	Discounted cash flow	Discount for:    Small issue size    Above-market coupon    Lease structure    Credit stress	11.8		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) —	12.4		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) 0.2% (0.2%)
Equity securities	Market comparables	Net tangible asset    market multiples	1.2		1.0X (1.0X)		1.1	1.0X (1.0X)
	Internal price	Unadjusted price from    financing round	4.4		5.60 (5.60)		4.4	5.60 (5.60)
Other	Discounted cash flow	Discount rate	4.0		16.2% (16.2%)		4.0	16.2% (16.2%)

The weighted average of the unobservable inputs was weighted by the relative fair value of the fixed maturity securities to which the inputs were applied. Each unobservable input is based on the Company’s subjective opinion and therefore inherently contains a degree of uncertainty. Significant increases (decreases) in any of the above inputs in isolation would result in a significantly lower (higher) fair value measurement. There were no interrelationships between these inputs which might magnify or mitigate the effect of changes in unobservable inputs on the fair value measurement.

5. Income Taxes

Income tax expense for the three months ended March 31, 2021 and 2020 has been computed using estimated annual effective tax rates. These rates are revised, if necessary, at the end of each successive interim period to reflect current estimates of the annual effective tax rates.

The tax provision was comprised of a U.S. federal income tax expense of $21.3 million and a benefit of $15.2 million for the three months ended March 31, 2021 and 2020, respectively.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions, and have previously filed in foreign jurisdictions. The Company and its subsidiaries are subject to U.S. federal and state income tax examinations and foreign examinations for years after 2016.

6. Pension Plans

The components of net periodic pension (benefit) cost for the defined benefit pension plans included in the Company’s results of operations are as follows:

	Three Months Ended March 31,
	2021			2020
(in millions)	Pension Plans
Interest cost	$	3.7		$	4.6
Expected return on plan assets		(4.6	)		(5.6	)
Recognized net actuarial loss		0.8			1.5
Net periodic pension (benefit) cost	$	(0.1	)	$	0.5

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7. Other Comprehensive Income (Loss)

The following tables provide changes in other comprehensive loss.

	Three Months Ended March 31,
	2021									2020
				Tax									Tax
				Benefit			Net of						Benefit			Net of
(in millions)	Pre-Tax			(Expense)			Tax			Pre-Tax			(Expense)			Tax
Changes in net unrealized gains (losses) on investment    securities:
Net unrealized losses arising during period for    those having no credit losses in Consolidated    Statement of Income	$	(234.1	)	$	49.2		$	(184.9	)	$	(100.3	)	$	20.9		$	(79.4	)
Net unrealized losses arising during period for    those having credit losses in Consolidated    Statement of Income		—			—			—			(22.1	)		4.7			(17.4	)
Amount of (gains) losses realized from sales and    other recognized in Consolidated Statement    of Income		1.6			(2.2	)		(0.6	)		(3.1	)		(1.2	)		(4.3	)
Amount of credit losses recognized in the    Consolidated Statement of Income		—			—			—			6.4			(1.4	)		5.0
Amount of additional impairment losses    recognized in the Consolidated Statement    of Income		—			—			—			16.3			(3.4	)		12.9
Net unrealized losses		(232.5	)		47.0			(185.5	)		(102.8	)		19.6			(83.2	)
Pension and postretirement benefits:
Amortization of net actuarial losses    recognized as net periodic benefit cost		0.8			(0.1	)		0.7			1.5			(0.3	)		1.2
Other comprehensive loss	$	(231.7	)	$	46.9		$	(184.8	)	$	(101.3	)	$	19.3		$	(82.0	)

Reclassifications out of accumulated other comprehensive income were as follows:

	Three Months Ended
	March 31,
(in millions)	2021			2020
	Amount Reclassified from
Details about Accumulated Other	Accumulated Other						Affected Line Item in the Statement
Comprehensive Income Components	Comprehensive Income						Where Net Income (Loss) is Presented
Net unrealized gains (losses) on investment    securities	$	(1.6	)	$	3.1		Net realized gains (losses) from sales and    other
		—			(22.2	)	Impairment losses on investments
		(1.6	)		(19.1	)	Total before tax
		2.2			5.9		Tax benefit
		0.6			(13.2	)	Continuing operations; net of tax
		—			(0.4	)	Discontinued operations - life businesses
		0.6			(13.6	)	Net of tax
Amortization of defined benefit pension    and postretirement actuarial losses		(0.8	)		(1.5	)	Loss adjustment expenses and other    operating expenses (1)
		0.1			0.3		Tax benefit
		(0.7	)		(1.2	)	Continuing operations; net of tax
Total reclassifications for the period	$	(0.1	)	$	(14.8	)	Expense reflected in income (loss),    net of tax

(1) The amount reclassified from accumulated other comprehensive income for the pension and postretirement benefits was allocated  approximately 40% to loss adjustment expenses and 60% to other operating expenses for the three months ended March 31, 2021 and 2020.

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8. Segment Information

The Company’s primary business operations include insurance products and services provided through three operating segments: Commercial Lines, Personal Lines and Other. Commercial Lines includes commercial multiple peril, commercial automobile, workers’ compensation, and other commercial coverages, such as management and professional liability, marine, Hanover Programs, specialty industrial and commercial property, monoline general liability and surety. Personal Lines includes personal automobile, homeowners and other personal coverages. Included in the Other segment are Opus Investment Management, Inc., which markets investment management services to institutions, pension funds and other organizations; earnings on holding company assets; holding company and other expenses, including certain costs associated with retirement benefits due to the Company’s former life insurance employees and agents; and a run-off voluntary property and casualty pools business. The separate financial information is presented consistent with the way results are regularly evaluated by the chief operating decision maker in deciding how to allocate resources and in assessing performance.

The Company reports interest expense related to debt separately from the earnings of its operating segments. This consists primarily of interest on the Company’s senior and subordinated debentures.

Management evaluates the results of the aforementioned segments based on operating income before income taxes, excluding interest expense on debt. Operating income before income taxes excludes certain items which are included in net income, such as net realized and unrealized investment gains and losses. Such gains and losses are excluded since they are determined by interest rates, financial markets and the timing of sales. Also, operating income before income taxes excludes net gains and losses on disposals of businesses, gains and losses related to the repayment of debt, discontinued operations, costs to acquire businesses, restructuring costs, the cumulative effect of accounting changes and certain other items. Although the items excluded from operating income before income taxes may be important components in understanding and assessing the Company’s overall financial performance, management believes that the presentation of operating income before income taxes enhances an investor’s understanding of the Company’s results of operations by highlighting net income attributable to the core operations of the business. However, operating income before income taxes should not be construed as a substitute for income before income taxes or income from continuing operations, and operating income should not be construed as a substitute for net income.

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Summarized below is financial information with respect to the Company’s business segments.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Operating revenues:
Commercial Lines	$	748.3		$	724.7
Personal Lines		493.3			488.5
Other		4.2			4.6
Total		1,245.8			1,217.8
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Total revenues	$	1,283.3		$	1,056.2
Operating income (loss) before interest expense and income taxes:
Commercial Lines:
Underwriting income (loss)	$	(49.3	)	$	10.4
Net investment income		51.8			46.4
Other expense		(0.3	)		(2.2	)
Commercial Lines operating income		2.2			54.6
Personal Lines:
Underwriting income		58.9			44.1
Net investment income		22.1			20.3
Other income		0.8			0.5
Personal Lines operating income		81.8			64.9
Other:
Underwriting loss		(0.3	)		(3.3	)
Net investment income		2.9			2.9
Other expense		(1.5	)		(2.0	)
Other operating income (loss)		1.1			(2.4	)
Operating income before interest expense and income taxes		85.1			117.1
Interest on debt		(8.5	)		(9.4	)
Operating income before income taxes		76.6			107.7
Non-operating items:
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Income (loss) from continuing operations before income taxes	$	114.1		$	(53.9	)

The following table provides identifiable assets for the Company’s business segments and discontinued operations:

(in millions)	March 31, 2021		December 31, 2020
Property and Casualty Insurance Companies	$	13,348.4	$	13,333.5
Assets of discontinued businesses		99.6		110.2
Total	$	13,448.0	$	13,443.7

The Company reviews the assets of its Property and Casualty Insurance Companies collectively and does not allocate them between the Commercial Lines, Personal Lines and Other segments.

9. Stock-based Compensation

As of March 31, 2021, there were 1,980,405 shares and 2,329,534 shares available for grant under The Hanover Insurance Group 2014 Long-Term Incentive Plan and The Hanover Insurance Group 2014 Employee Stock Purchase Plan, respectively.

Compensation cost for the Company’s stock-based awards and the related tax benefits were as follows:

	Three Months Ended March 31,
(in millions)	2021			2020
Stock-based compensation expense	$	5.6		$	5.0
Tax benefit		(1.2	)		(1.1	)
Stock-based compensation expense, net of taxes	$	4.4		$	3.9

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Stock Options

Information on the Company’s stock option activity for the three months ended March 31, 2021 and 2020 is summarized below.

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of period		1,282,278		$	93.64		1,121,559		$	87.88
Granted		178,040			115.35		240,705			118.54
Exercised		(67,954	)		80.96		(35,918	)		79.40
Forfeited or cancelled		—			—		—			—
Outstanding, end of period		1,392,364			97.03		1,326,346			93.67

Restricted Stock Units

The Company currently issues time-based, market-based and performance-based restricted stock units to eligible employees, all of which generally vest after 3 years of continued employment.

The following tables summarize activity information about employee restricted stock units: 

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Time-based restricted stock units:
Outstanding, beginning of period		350,480		$	116.37		335,166		$	109.55
Granted		168,092			115.04		136,634			118.60
Vested		(109,667	)		110.68		(78,773	)		85.44
Forfeited		(7,388	)		116.82		(2,861	)		112.24
Outstanding, end of period		401,517			117.37		390,166			117.56
Performance-based and market-based restricted stock units:
Outstanding, beginning of period		97,043		$	119.59		86,252		$	110.70
Granted		62,143			114.66		54,415			105.10
Vested		(43,506	)		122.27		(36,499	)		80.26
Forfeited		—			—		—			—
Outstanding, end of period		115,680			115.93		104,168			118.45

In the first three months of 2021 and 2020, the Company granted market-based awards totaling 37,348 and 34,911, respectively, to certain members of senior management, which are included in the table above as performance and market-based restricted stock activity. The vesting of these stock units is based on the relative total shareholder return (“TSR”) of the Company. This metric is generally based on relative TSR for a three-year period as compared to a pre-selected group of property and casualty companies. The fair value of market-based awards was estimated at the date of grant using a valuation model. These units have the potential to range from 0% to 150% of the shares disclosed. Included in the amount granted above in 2021 and 2020 are 14,501 shares and 13,532 shares, respectively, related to market-based awards that achieved a payout in excess of 100%. These awards vested in the first quarters of 2021 and 2020, respectively.

The Company also granted performance-based restricted stock units in 2021 and 2020, totaling 21,401 and 19,504, respectively, which are based upon the Company’s achievement of return on equity objectives. These units have the potential to range from 0% to 150% of the shares disclosed, which varies based on grant year and individual participation level. Increases above the 100% target level are reflected as granted in the period in which performance-based stock unit goals are achieved. Decreases below the 100% target level are reflected as forfeited. There were no performance-based awards that vested in 2021 or 2020. 

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10. Earnings Per Share and Shareholders’ Equity Transactions

The following table provides weighted average share information used in the calculation of the Company’s basic and diluted earnings per share:

	Three Months Ended
	March 31,
(in millions, except per share data)	2021			2020
Basic shares used in the calculation of earnings per share		36.4			38.3
Dilutive effect of securities (1):
Employee stock options		0.3			—
Non-vested stock grants		0.2			—
Diluted shares used in the calculation of earnings per share		36.9			38.3
Per share effect of dilutive securities on income (loss) from    continuing operations	$	(0.03	)	$	—
Per share effect of dilutive securities on net income	$	(0.04	)	$	—

(1) Excludes 0.6 million shares due to antidilution that resulted from the Company having losses from continuing operations and net losses for the quarter ended March 31, 2020.

Diluted earnings per share for the three months ended March 31, 2021 and 2020 excludes 0.2 million and 0.4 million shares, respectively, issuable under the Company’s stock compensation plans because their effect would be antidilutive.

The Board of Directors has authorized a stock repurchase program which provides for aggregate repurchases of the Company’s common stock of up to $900 million, and under which the Company had approximately $78 million available at March 31, 2021. Under the repurchase authorization, the Company may repurchase, from time to time, common stock in amounts, at prices and at such times as the Company deems appropriate, subject to market conditions and other considerations. Repurchases may be executed using open market purchases, privately negotiated transactions, accelerated repurchase programs or other transactions. The Company is not required to purchase any specific number of shares or to make purchases by any certain date under this program. On October 29, 2020, pursuant to the terms of an accelerated share repurchase agreement (the “October 2020 ASR”) the Company paid $100.0 million and received an initial delivery of approximately 0.8 million shares of its common stock, which was approximately 80% of the total number of shares expected to be repurchased under the October 2020 ASR. On January 29, 2021, the Company received approximately 45,000 shares of its common stock shares as final settlement of shares repurchased under the October 2020 ASR.

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11. Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses

Reserve Rollforward and Prior Year Development

The Company regularly updates its reserve estimates as new information becomes available and further events occur which may impact the resolution of unsettled claims. Reserve adjustments are reflected in results of operations as adjustments to losses and loss adjustment expenses (“LAE”). Often these adjustments are recognized in periods subsequent to the period in which the underlying policy was written and loss event occurred. These types of subsequent adjustments are described as “prior years’ loss reserves.” Such development can be either favorable or unfavorable to the Company’s financial results and may vary by line of business. In this section, all amounts presented include catastrophe losses and LAE, unless otherwise indicated.

The table below provides a reconciliation of the gross beginning and ending reserve for unpaid losses and loss adjustment expenses.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Gross reserve for losses and LAE, beginning of period	$	6,024.0		$	5,654.4
Reinsurance recoverable on unpaid losses		1,641.6			1,574.8
Net reserve for losses and LAE, beginning of period		4,382.4			4,079.6
Net incurred losses and LAE in respect of losses occurring in:
Current year		789.5			730.2
Prior years		(8.2	)		(2.0	)
Total incurred losses and LAE		781.3			728.2
Net payments of losses and LAE in respect of losses occurring in:
Current year		178.5			174.6
Prior years		435.0			484.4
Total payments		613.5			659.0
Net reserve for losses and LAE, end of period		4,550.2			4,148.8
Reinsurance recoverable on unpaid losses		1,673.5			1,576.1
Gross reserve for losses and LAE, end of period	$	6,223.7		$	5,724.9

As a result of continuing trends in the Company’s business, reserves, including catastrophes, have been re-estimated for all prior accident years and were decreased by $8.2 million and $2.0 million in 2021 and 2020, respectively.

2021

For the three months ended March 31, 2021, net favorable loss and LAE development was $8.2 million. This was primarily due to lower than expected losses in the personal automobile line, driven by lower bodily injury and personal injury protection losses primarily in accident year 2020, and in the workers’ compensation line, primarily in accident years 2015 through 2017 and 2019.

2020

For the three months ended March 31, 2020, net favorable loss and LAE development was $2.0 million. Lower than expected losses in the workers’ compensation line, other commercial lines and homeowners line were partially offset by higher than expected losses in the commercial and personal automobile lines, commercial multiple peril line, and in the Company’s run-off voluntary assumed property and casualty reinsurance pools business. Within other commercial lines, lower than expected losses in the Company’s marine line and specialty industrial and commercial property lines were partially offset by higher than expected losses in the general liability lines. The higher than expected losses in the Company’s run-off voluntary assumed property and casualty reinsurance pools business was based on an updated third-party actuarial study received in the first quarter of 2020 for the Excess and Casualty Reinsurance Association (“ECRA”) pool that primarily consists of asbestos and environmental exposures.

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12. Commitments and Contingencies

Legal Proceedings

The Company has been named a defendant in various legal proceedings arising in the normal course of business. In addition, the Company is involved, from time to time, in examinations, investigations and proceedings by governmental and self-regulatory agencies. The potential outcome of any such action or regulatory proceedings in which the Company has been named a defendant or the subject of an inquiry or investigation, and its ultimate liability, if any, from such actions or regulatory proceedings, is difficult to predict at this time. The ultimate resolutions of such proceedings are not expected to have a material effect on its financial position, although they could have a material effect on the results of operations for a particular quarterly or annual period.

Residual Markets

The Company is required to participate in residual markets in various states, which generally pertain to high risk insureds, disrupted markets or lines of business or geographic areas where rates are regarded as excessive. The results of the residual markets are not subject to the predictability associated with the Company’s own managed business, and are significant to both the personal and commercial automobile lines of business.

13. Subsequent Events

There were no subsequent events requiring adjustment to the financial statements and no additional disclosure required in the notes to the consolidated financial statements.

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PART I

ITEM 2

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

TABLE OF CONTENTS

Introduction	24
Executive Overview	24
Description of Operating Segments	25
Results of Operations - Consolidated	25
Results of Operations - Segments	27
Investments	32
Other Items	35
Income Taxes	36
Critical Accounting Estimates	36
Statutory Surplus of Insurance Subsidiaries	36
Liquidity and Capital Resources	37
Off - Balance Sheet Arrangements	38
Contingencies and Regulatory Matters	38
Risks and Forward - Looking Statements	39

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Introduction

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations is intended to assist readers in understanding the interim consolidated results of operations and financial condition of The Hanover Insurance Group, Inc. and its subsidiaries (“THG”). Consolidated results of operations and financial condition are prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). This discussion should be read in conjunction with the interim consolidated financial statements and related footnotes included elsewhere in this Quarterly Report on Form 10-Q and Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on February 24, 2021.

Results of operations include the accounts of The Hanover Insurance Company (“Hanover Insurance”) and Citizens Insurance Company of America (“Citizens”), our principal property and casualty insurance companies, and other insurance and non-insurance subsidiaries. Our results of operations also include the results of our discontinued operations, consisting of our accident and health and former life insurance businesses.

Executive Overview

Business operations consist of three operating segments: Commercial Lines, Personal Lines and Other.

Our strategy, which focuses on the independent agency distribution channel, supports THG’s commitment to our customers and to our agency partners. It is designed to generate profitable growth by leveraging the strengths of our distribution approach, including expansion of our agency footprint in underpenetrated geographies, as warranted. As part of that strategy, we have increased our capabilities in specialty markets and made investments designed to develop growth solutions for our agency distribution channel and meet the needs of our customers. Our goal is to grow responsibly in all of our businesses, while managing volatility.

The outbreak of the novel coronavirus, also known as COVID-19, and subsequent global pandemic (“Pandemic”) has significantly impacted the U.S. and global financial markets and economies since March 2020. Circumstances relating to the Pandemic are unprecedented in scope and impact, continue to evolve, and are complex and uncertain.  Our investment portfolio was affected by the deterioration in investment markets during March 2020, as well as the volatility in the subsequent months. In addition, we experienced both favorable and adverse effects from the Pandemic on our underwriting results and operations, as well as our financial condition, during the period from March 2020 through March 2021. We continue to believe that the Pandemic’s impacts on our near-term results should be manageable. However, the severity, duration and long-term impacts of the Pandemic may affect the property and casualty insurance industry, our business, and our financial results over the intermediate and long-term. (See “Contingencies and Regulatory Matters” and “Item 1A – Risk Factors” for further discussion).

During the three months ended March 31, 2021, our net income was $92.7 million, compared to a net loss of $40.0 million for the three months ended March 31, 2020, an increase of $132.7 million, primarily due to changes in the fair value of equity securities and, to a lesser extent, prior year impairments on fixed income securities, partially offset by a decrease in operating income.

Operating income before interest expense and income taxes (a non-GAAP financial measure; see also “Results of Operations – Consolidated – Non-GAAP Financial Measures”) was $85.1 million for the three months ended March 31, 2021, compared to $117.1 million for the three months ended March 30, 2020, a decrease of $32.0 million. This decrease was primarily due to higher catastrophe losses, partially offset by lower non-catastrophe current accident year losses, primarily in our personal automobile and commercial multiple peril lines and, to a lesser extent, higher net investment income.

Pre-tax catastrophe losses were $133.3 million for the three months ended March 31, 2021, compared to $37.9 million during the same period of 2020. The increase of $95.4 million was primarily due to freeze events in Texas and surrounding states impacting our commercial property lines.  Net favorable development on prior years’ loss and loss adjustment expense (“LAE”) reserves (“prior years’ loss reserves”) was $8.2 million for the three months ended March 31, 2021, compared to $2.0 million for the three months ended March 31, 2020.

Commercial Lines

Our account-focused approach to the small commercial market, distinctiveness in the middle market, and continued development of specialty lines provides us with a diversified portfolio of products and delivers significant value to agents and policyholders. We continue to pursue our core strategy of developing strong partnerships with agents, enhanced franchise value through selective distribution, distinctive products and coverages, and through continued investment in industry segmentation. Net premiums written increased 7.0% in the first three months of 2021, compared to the same period in 2020, primarily due to pricing increases.

Underwriting results declined in the first three months of 2021, primarily due to higher catastrophe losses, partially offset by lower non-catastrophe current accident year losses in our commercial multiple peril and commercial automobile lines. The competitive nature of the Commercial Lines market requires us to be highly disciplined in our underwriting process to ensure that we write business at acceptable margins, and we continue to seek rate increases across many lines of business. Due to uncertainty caused by the Pandemic, there is a level of uncertainty in our ability to grow our business and maintain or improve our underwriting profitability in this environment.

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Personal Lines

Personal Lines focuses on partnering with high quality, value-oriented agencies that deliver consultative selling to customers and stress the importance of account rounding (the conversion of single policy customers to accounts with multiple policies and/or additional coverages, to address customers’ broader objectives). Approximately 86% of our policies in force have been issued to customers with multiple policies and/or coverages with us. We are focused on seeking profitable growth opportunities, building a distinctive position in the market in order to meet our customers’ needs and diversifying geographically. We continue to seek appropriate rate increases that meet or exceed underlying loss cost trends, subject to regulatory and competitive considerations. Due to uncertainty caused by the Pandemic, there is a level of uncertainty in our ability to grow our business and maintain or improve our underwriting profitability in this environment.

Net premiums written increased by 2.2% in the first three months of 2021, compared to the same period in 2020. The modest premium growth reflects rate increases, partially offset by lower policies in force. Underwriting results improved in the first three months of 2021, primarily due to lower non-catastrophe current accident year losses in our personal automobile line, partially offset by higher large losses in our homeowners line. The lower personal automobile losses were due to fewer accidents and decreased claim activity resulting from changes in driving patterns as a result of the Pandemic.

Description of Operating Segments

Primary business operations include insurance products and services currently provided through three operating segments: Commercial Lines, Personal Lines and Other. Commercial Lines includes commercial multiple peril, commercial automobile, workers’ compensation and other commercial coverages, such as management and professional liability, marine, Hanover Programs, specialty industrial and commercial property, monoline general liability and surety. Personal Lines includes personal automobile, homeowners and other personal coverages, such as umbrella. Included in the “Other” segment are Opus Investment Management, Inc., which markets investment management services to institutions, pension funds, and other organizations; earnings on holding company assets; holding company and other expenses, including certain costs associated with retirement benefits due to our former life insurance employees and agents; and a run-off voluntary property and casualty pools business. We present the separate financial information of each segment consistent with the manner in which our chief operating decision maker evaluates results in deciding how to allocate resources and in assessing performance.

We report interest expense on debt separately from the earnings of our operating segments. This consists primarily of interest on our senior and subordinated debentures.

Results of Operations – Consolidated

Consolidated net income for the three months ended March 31, 2021 was $92.7 million, compared to a net loss of $40.0 million for the three months ended March 31, 2020, an increase of $132.7 million. The increase in consolidated net income (loss) was primarily a result of $31.4 million of after-tax net realized and unrealized investment gains in 2021 as compared to $125.5 million of after-tax net realized and unrealized investment losses in 2020, a change of $156.9 million. This change was primarily related to the change in fair value of equity securities and, to a lesser extent, a decrease in impairment losses on investments. Partially offsetting this increase was lower operating income before interest expense and income taxes for the three months ended March 31, 2021. Operating income before interest expense and income taxes decreased $32.0 million primarily due to higher catastrophe losses, partially offset by lower non-catastrophe current accident year losses, and, to a lesser extent, higher net investment income.  

25

The following table reflects operating income (loss) before interest expense and income taxes for each operating segment and a reconciliation to consolidated net income (loss) from operating income before interest expense and income taxes (a non-GAAP measure).

	Three Months Ended
	March 31,
(in millions)	2021			2020
Operating income (loss) before interest expense and income taxes:
Commercial Lines	$	2.2		$	54.6
Personal Lines		81.8			64.9
Other		1.1			(2.4	)
Operating income before interest expense and income taxes		85.1			117.1
Interest expense on debt		(8.5	)		(9.4	)
Operating income before income taxes		76.6			107.7
Income tax expense on operating income		(15.2	)		(20.9	)
Operating income		61.4			86.8
Non-operating items:
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Income tax benefit (expense) on non-operating items		(6.1	)		36.1
Income (loss) from continuing operations, net of taxes		92.8			(38.7	)
Discontinued operations (net of taxes):
Loss from discontinued life businesses		(0.1	)		(1.3	)
Net income (loss)	$	92.7		$	(40.0	)

Non-GAAP Financial Measures

In addition to consolidated net income, discussed above, we assess our financial performance based upon pre-tax “operating income,” and we assess the operating performance of each of our three operating segments based upon the pre-tax operating income (loss) generated by each segment. As reflected in the table above, operating income before interest expense and income taxes excludes interest expense on debt and certain other items which we believe are not indicative of our core operations, such as net realized and unrealized investment gains and losses. Such gains and losses are excluded since they are determined by interest rates, financial markets and the timing of sales. Also, operating income before interest expense and income taxes excludes net gains and losses on disposals of businesses, gains and losses related to the repayment of debt, discontinued operations, costs to acquire businesses, restructuring costs, the cumulative effect of accounting changes and certain other items. Although the items excluded from operating income before interest expense and income taxes are important components in understanding and assessing our overall financial performance, we believe a discussion of operating income before interest expense and income taxes enhances an investor’s understanding of our results of operations by highlighting net income (loss) attributable to the core operations of the business. However, operating income before interest expense and income taxes, which is a non-GAAP measure, should not be construed as a substitute for income before income taxes or income from continuing operations, and operating income should not be construed as a substitute for net income (loss).

Catastrophe losses and prior years’ reserve development are significant components in understanding and assessing the financial performance of our business. Management reviews and evaluates catastrophes and prior years’ reserve development separately from the other components of earnings. References to “current accident year underwriting results” exclude prior accident year reserve development and may also be presented “excluding catastrophes.” Prior years’ reserve development and catastrophes are not predictable as to timing or the amount that will affect the results of our operations and have an effect on each year’s operating and net income. Management believes that providing certain financial metrics and trends excluding the effects of catastrophes and prior years’ reserve development helps investors to understand the variability in periodic earnings and to evaluate the underlying performance of our operations. Discussion of catastrophe losses in this Management’s Discussion and Analysis includes development on prior years’ catastrophe reserves and, unless otherwise indicated, such development is excluded from discussions of prior year loss and LAE reserve development.

26

Results of Operations – Segments

The following is our discussion and analysis of the results of operations by business segment. The operating results are presented before interest expense, income taxes and other items which management believes are not indicative of our core operations, including realized gains and losses, as well as unrealized gains and losses on equity securities, and the results of discontinued operations.

The following table summarizes the results of operations for the periods indicated:

	Three Months Ended
	March 31,
(in millions)	2021		2020
Operating revenues
Net premiums written	$	1,196.1	$	1,136.9
Net premiums earned		1,161.8	$	1,141.4
Net investment income		76.8		69.6
Other income		7.2		6.8
Total operating revenues		1,245.8		1,217.8
Losses and operating expenses
Losses and LAE		781.3		728.2
Amortization of deferred acquisition costs		240.3		236.9
Other operating expenses		139.1		135.6
Total losses and operating expenses		1,160.7		1,100.7
Operating income before interest expense and income taxes	$	85.1	$	117.1

Three Months Ended March 31, 2021 Compared to Three Months Ended March 31, 2020  

Operating income before interest expense and income taxes was $85.1 million for the three months ended March 31, 2021, compared to $117.1 million for the three months ended March 31, 2020, a decrease of $32.0 million. This decrease was primarily due to higher catastrophe losses in our commercial property lines, partially offset by lower non-catastrophe current accident year losses, primarily in our personal automobile and commercial multiple peril lines and, to a lesser extent, higher net investment income.

Net premiums written increased $59.2 million in the three months ended March 31, 2021, compared to the three months ended March 31, 2020, due to growth in both our Commercial and Personal Lines segments.

Production and Underwriting Results

The following tables summarize premiums written on a gross and net basis, net premiums earned and loss (including catastrophe losses), LAE, expense and combined ratios for the Commercial Lines and Personal Lines segments. Loss, LAE, catastrophe loss and combined ratios shown below include prior year reserve development. These items are not meaningful for our Other segment.  

	Three Months Ended March 31, 2021
(dollars in millions)	Gross Premiums Written		Net Premiums Written		Net Premiums Earned		Catastrophe Loss Ratios		Loss & LAE Ratios		Expense Ratios		Combined Ratios
Commercial Lines	$	884.0	$	757.4	$	692.9		17.1		72.8		34.1		106.9
Personal Lines		453.6		438.7		468.9		3.1		59.0		28.0		87.0
Total	$	1,337.6	$	1,196.1	$	1,161.8		11.5		67.2		31.6		98.8
	Three Months Ended March 31, 2020
(dollars in millions)	Gross Premiums Written		Net Premiums Written		Net Premiums Earned		Catastrophe Loss Ratios		Loss & LAE Ratios		Expense Ratios		Combined Ratios
Commercial Lines	$	830.5	$	707.6	$	675.9		3.5		64.2		34.0		98.2
Personal Lines		458.4		429.3		465.5		3.0		62.5		27.5		90.0
Total	$	1,288.9	$	1,136.9	$	1,141.4		3.3		63.8		31.4		95.2

27

The following table summarizes net premiums written, and loss and LAE and catastrophe loss ratios by line of business for the Commercial Lines and Personal Lines segments. Loss and LAE and catastrophe loss ratios include prior year reserve development.  

	Three Months Ended March 31,
	2021							2020
(dollars in millions)	Net Premiums Written		Loss & LAE Ratios		Catastrophe Loss Ratios			Net Premiums Written		Loss & LAE Ratios		Catastrophe Loss Ratios
Commercial Lines:
Commercial multiple peril	$	242.5		96.8		39.6		$	234.9		74.0		6.4
Commercial automobile		92.2		59.3		(0.1	)		89.9		72.0		0.2
Workers’ compensation		97.2		56.5		—			96.9		54.7		—
Other commercial		325.5		62.3		9.2			285.9		56.6		3.2
Total Commercial Lines	$	757.4		72.8		17.1		$	707.6		64.2		3.5
Personal Lines:
Personal automobile	$	280.7		58.4		0.2		$	279.4		68.6		0.6
Homeowners		143.1		62.0		8.6			137.6		54.2		7.7
Other personal		14.9		38.6		—			12.3		27.7		1.5
Total Personal Lines	$	438.7		59.0		3.1		$	429.3		62.5		3.0

The following table summarizes U.S. GAAP underwriting results for the Commercial Lines, Personal Lines and Other segments and reconciles them to operating income (loss) before interest expense and income taxes.  

	Three Months Ended March 31,
	2021												2020
(in millions)	Commercial Lines			Personal Lines			Other			Total			Commercial Lines			Personal Lines			Other			Total
Underwriting profit, excluding    prior year reserve development    and catastrophes	$	66.2		$	68.2		$	—		$	134.4		$	30.5		$	56.6		$	—		$	87.1
Prior year favorable (unfavorable)    loss and LAE reserve development    on non-catastrophe losses		3.3			5.2			(0.3	)		8.2			3.7			1.6			(3.3	)		2.0
Prior year favorable (unfavorable)    catastrophe development		—			—			—			—			3.3			(3.3	)		—			—
Current year catastrophe losses		(118.8	)		(14.5	)		—			(133.3	)		(27.1	)		(10.8	)		—			(37.9	)
Underwriting profit (loss)		(49.3	)		58.9			(0.3	)		9.3			10.4			44.1			(3.3	)		51.2
Net investment income		51.8			22.1			2.9			76.8			46.4			20.3			2.9			69.6
Fees and other income		3.6			2.3			1.3			7.2			2.4			2.7			1.7			6.8
Other operating expenses		(3.9	)		(1.5	)		(2.8	)		(8.2	)		(4.6	)		(2.2	)		(3.7	)		(10.5	)
Operating income (loss) before    interest expense and income taxes	$	2.2		$	81.8		$	1.1		$	85.1		$	54.6		$	64.9		$	(2.4	)	$	117.1

Commercial Lines

Commercial Lines net premiums written were $757.4 million for the three months ended March 31, 2021, compared to $707.6 million for the three months ended March 31, 2020. This $49.8 million increase was primarily driven by pricing increases and strong retention.

Commercial Lines underwriting loss for the three months ended March 31, 2021 was $49.3 million, compared to underwriting profit of $10.4 million for the three months ended March 31, 2020, a decrease of $59.7 million. Catastrophe losses for the three months ended March 31, 2021 were $118.8 million, compared to $23.8 million for the three months ended March 31, 2020. The $95.0 million increase was primarily due to freeze events in Texas and surrounding states associated with record low temperatures. Net favorable development on prior year’s loss reserves for the three months ended March 31, 2021 was $3.3 million, compared to $3.7 million for the three months ended March 31, 2020, a decrease of $0.4 million.

Commercial Lines current accident year underwriting profit, excluding catastrophes, was $66.2 million for the three months ended March 31, 2021, compared to $30.5 million for the three months ended March 31, 2020. This $35.7 million increase was primarily driven by lower non-catastrophe current accident year losses, primarily in our commercial multiple peril and commercial automobile lines. The lower current accident year losses in commercial multiple peril reflect a single $12.6 million large property loss in 2020.

28

Our property per risk excess of loss reinsurance treaty incepts annually on July 1^st and includes a $10 million annual aggregate deductible for the $10 million excess of $10 million layer. As the 2020 large loss was the first to impact this layer of coverage in the treaty year, we retained $10 million of this large commercial multiple peril property loss to satisfy this deductible for the layer. The lower commercial automobile losses were due to fewer accidents and decreased claim activity resulting from changes in driving patterns as a result of the Pandemic. Additionally, the Commercial Lines current accident year losses and LAE also reflected a reserve provision for COVID-19 related exposures in 2020. 

We continue to manage underwriting performance through increased rates, pricing segmentation, specific underwriting actions and targeted new business growth. Our ability to achieve overall rate increases is affected by many factors, including regulatory activity and the current competitive pricing environment, particularly within the workers’ compensation line. Due to uncertainty caused by the Pandemic, there is a level of uncertainty in our ability to grow our business and maintain or improve our underwriting profitability in this environment. The extent and duration of the Pandemic's future disruption to our businesses are unknown and may result in continued moderation in claims volumes due to a reduction in business activity and reduced premium levels.

Personal Lines

Personal Lines net premiums written were $438.7 million for the three months ended March 31, 2021, compared to $429.3 million for the three months ended March 31, 2020. The premium growth of $9.4 million was primarily driven by rate increases, partially offset by lower policies in force.

Net premiums written in the personal automobile line of business for the three months ended March 31, 2021 were $280.7 million, compared to $279.4 million for the three months ended March 31, 2020, an increase of $1.3 million. Personal automobile policies in force decreased by 2.7%.  Net premiums written in the homeowners line of business for the three months ended March 31, 2021 were $143.1 million, compared to $137.6 million for the three months ended March 31, 2020, an increase of $5.5 million. Homeowners policies in force decreased by 0.9%.  

Personal Lines underwriting profit for the three months ended March 31, 2021 was $58.9 million, compared to $44.1 million for the three months ended March 31, 2020, an increase of $14.8 million. Catastrophe losses for the three months ended March 31, 2021 were $14.5 million, compared to $14.1 million for the three months ended March 31, 2020, an increase of $0.4 million. Net favorable development on prior year’s loss reserves for the three months ended March 31, 2021 was $5.2 million, compared to $1.6 million for the three months ended March 31, 2020, an increase of $3.6 million.

Personal Lines current accident year underwriting profit, excluding catastrophes, was $68.2 million for the three months ended March 31, 2021, compared to $56.6 million for the three months ended March 31, 2020. This $11.6 million increase was primarily due to lower current accident year losses in our personal automobile line, partially offset by higher large losses in our homeowners line. The lower personal automobile losses were due to fewer accidents and decreased claim activity resulting from changes in driving patterns as a result of the Pandemic.

We have been able to obtain rate increases in our Personal Lines markets and believe that our ability to obtain increases will continue over the long term. Our ability to maintain Personal Lines net premiums written may be affected, however, by price competition, and regulatory and legal activity and developments. See “Contingencies and Regulatory Matters.” Additionally, these factors along with weather-related loss volatility may also affect our ability to maintain and improve underwriting results. We monitor these trends and consider them in our rate actions. Due to uncertainty caused by the Pandemic, there is a level of uncertainty in our ability to retain or grow our business, and maintain or improve our underwriting profitability in this environment.

Other

Our Other segment had operating income of $1.1 million for the three months ended March 31, 2021, compared to an operating loss of $2.4 million for the three months ended March 31, 2020, a favorable change of $3.5 million. This change is primarily due to prior year’s results including a $3.3 million reserve increase, based on the receipt of an updated third-party actuarial study for the legacy Excess and Casualty Reinsurance Association (“ECRA”) pool.

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Reserve for Losses and Loss Adjustment Expenses

The table below provides a reconciliation of the gross beginning and ending reserve for unpaid losses and loss adjustment expenses.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Gross reserve for losses and LAE, beginning of period	$	6,024.0		$	5,654.4
Reinsurance recoverable on unpaid losses		1,641.6			1,574.8
Net reserve for losses and LAE, beginning of period		4,382.4			4,079.6
Net incurred losses and LAE in respect of losses occurring in:
Current year		789.5			730.2
Prior year non-catastrophe loss development		(8.2	)		(2.0	)
Total incurred losses and LAE		781.3			728.2
Net payments of losses and LAE in respect of losses occurring in:
Current year		178.5			174.6
Prior years		435.0			484.4
Total payments		613.5			659.0
Net reserve for losses and LAE, end of period		4,550.2			4,148.8
Reinsurance recoverable on unpaid losses		1,673.5			1,576.1
Gross reserve for losses and LAE, end of period	$	6,223.7		$	5,724.9

The table below summarizes the gross reserve for losses and LAE by line of business.

	March 31,		December 31,
(in millions)	2021		2020
Commercial multiple peril	$	1,288.5	$	1,211.0
Workers’ compensation		710.0		699.4
Commercial automobile		459.4		454.8
Other commercial lines:
Hanover Programs		565.7		565.3
Management and professional liability		356.9		340.8
Monoline general liability		287.1		280.3
Umbrella		246.2		230.2
Specialty industrial and commercial property		111.7		76.9
Surety		103.3		93.6
Marine		99.9		94.0
Other lines		27.2		29.5
Total other commercial lines		1,798.0		1,710.6
Total Commercial Lines		4,255.9		4,075.8
Personal automobile		1,669.5		1,670.3
Homeowners and other personal		257.9		237.5
Total Personal Lines		1,927.4		1,907.8
Total Other Segment		40.4		40.4
Total loss and LAE reserves	$	6,223.7	$	6,024.0

“Other commercial lines – Other lines” in the table above is primarily comprised of fidelity and crime lines of business. Loss and LAE reserves in our “Total Other Segment” relate to our run-off voluntary assumed property and casualty reinsurance pools business.

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The following table summarizes prior year (favorable) unfavorable development for the periods indicated:

	Three Months Ended March 31,
	2021								2020
(in millions)	Loss & LAE			Catastrophe		Total			Loss & LAE			Catastrophe			Total
Commercial Lines	$	(3.3	)	$	—	$	(3.3	)	$	(3.7	)	$	(3.3	)	$	(7.0	)
Personal Lines		(5.2	)	—			(5.2	)		(1.6	)		3.3			1.7
Other Segment		0.3		—			0.3			3.3		—				3.3
Total prior year favorable development	$	(8.2	)	$	—	$	(8.2	)	$	(2.0	)	$	—		$	(2.0	)

It is not possible to know whether the factors that affected loss reserves in the first three months of 2021 will also occur in future periods. We encourage you to read our 2020 Annual Report on Form 10-K for more information about our reserving process and the judgments, uncertainties and risks associated therewith.

Catastrophe Loss Development

For the three months ended March 31, 2021 and 2020, catastrophe loss development was zero in both periods.

2021 Loss and LAE Development, excluding catastrophes

For the three months ended March 31, 2021, net favorable loss and LAE development, excluding catastrophes, was $8.2 million primarily due to lower than expected losses in the personal automobile line, driven by lower bodily injury and personal injury protection losses primarily in accident year 2020, and in the workers’ compensation line, primarily in accident years 2015 through 2017 and 2019.

2020 Loss and LAE Development, excluding catastrophes

For the three months ended March 31, 2020, net favorable loss and LAE development, excluding catastrophes, was $2.0 million. Lower than expected losses in the workers’ compensation line, primarily in accident years 2016, 2018 and 2019, and other commercial and homeowners lines were partially offset by higher than expected losses in the commercial and personal automobile and commercial multiple peril lines. Within other commercial lines, lower than expected losses in our marine line, primarily in accident years 2018 and 2019, and specialty industrial and commercial property lines were partially offset by higher than expected losses in the general liability lines. The adverse prior year development for our Other Segment was due to our run-off voluntary assumed property and casualty reinsurance pools business. This $3.3 million reserve increase was based on an updated third-party actuarial study received in the first quarter of 2020 for the legacy ECRA pool that primarily consists of asbestos and environmental exposures.

Reinsurance Recoverables

Reinsurance recoverables were $1,882.9 million and $1,874.3 million at March 31, 2021 and December 31, 2020, respectively, of which $60.5 million and $88.4 million, respectively, represent billed recoverables. A reinsurance recoverable is billed after an eligible reinsured claim is paid by an insurer. Billed reinsurance recoverables related to the Michigan Catastrophic Claims Association (the “MCCA”) were $36.1 million and $35.5 million at March 31, 2021 and December 31, 2020, respectively, and billed non-MCCA reinsurance recoverables totaled $24.4 million and $52.9 million at March 31, 2021 and December 31, 2020, respectively. At March 31, 2021, $0.2 million of the billed non-MCCA recoverables were outstanding greater than 90 days, whereas at December 31, 2020, there were no balances outstanding greater than 90 days.

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Investments

Investment Results

Net investment income before income taxes was as follows:

	Three Months Ended March 31,
(dollars in millions)	2021			2020
Fixed maturities	$	54.5		$	56.2
Limited partnerships		15.1			6.6
Mortgage loans		5.4			4.3
Equity securities		3.8			3.8
Other investments		0.7			0.9
Investment expenses		(2.7	)		(2.2	)
Net investment income	$	76.8		$	69.6
Earned yield, fixed maturities		3.11	%		3.45	%
Earned yield, total portfolio		3.74	%		3.60	%

The increase in net investment income for the three months ended March 31, 2021 was primarily due to higher limited partnership income, the continued investment of operational cash flows and higher mortgage loan income, partially offset by the impact of lower new money yields. Higher income from our limited partnerships primarily reflects increased market valuation due to positive valuation changes in the funds’ equity holdings and certain successful fund investments. We expect average fixed income yields to continue to decline as new money rates remain lower than our embedded book yield.

Investment Portfolio

We held cash and investment assets diversified across several asset classes, as follows:

	March 31, 2021					December 31, 2020
(dollars in millions)	Carrying Value		% of Total Carrying Value			Carrying Value		% of Total Carrying Value
Fixed maturities, at fair value	$	7,370.3		82.7	%	$	7,454.4		83.2	%
Equity securities, at fair value		641.0		7.2			598.5		6.7
Mortgage and other loans		442.1		4.9			467.6		5.2
Other investments		351.1		3.9			325.6		3.6
Cash and cash equivalents		112.1		1.3			120.6		1.3
Total cash and investments	$	8,916.6		100.0	%	$	8,966.7		100.0	%

Cash and Investments

Total cash and investments decreased $50.1 million, or less than 1%, for the three months ended March 31, 2021 as compared to December 31, 2020. This decrease was primarily due to market value depreciation and the funding of financing activities, including our stock repurchases and dividend payments, partially offset by the continued investment of operational cash flows.

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The following table provides information about the investment types of our fixed maturities portfolio:

	March 31, 2021
(in millions) Investment Type	Amortized Cost, Net of Allowance for Credit Losses		Fair Value		Net Unrealized Gains (Losses)			Change in Net Unrealized For the Year
U.S. Treasury and government agencies	$	360.7	$	359.7	$	(1.0	)	$	(16.6	)
Foreign government		2.2		2.6		0.4			(0.1	)
Municipals:
Taxable		1,015.0		1,040.9		25.9			(34.0	)
Tax-exempt		31.3		32.2		0.9			(0.8	)
Corporate		3,908.6		4,115.2		206.6			(134.8	)
Asset-backed:
Residential mortgage-backed		981.5		994.2		12.7			(19.8	)
Commercial mortgage-backed		722.8		756.5		33.7			(20.9	)
Asset-backed		67.0		69.0		2.0			(0.6	)
Total fixed maturities	$	7,089.1	$	7,370.3	$	281.2		$	(227.6	)

The decrease in net unrealized gains on fixed maturities was primarily due to higher prevailing interest rates.

Amortized cost and fair value by rating category were as follows:

		March 31, 2021							December 31, 2020
(dollars in millions) NAIC Designation	Rating Agency Equivalent Designation	Amortized Cost, Net of Allowance for Credit Losses		Fair Value		% of Total Fair Value			Amortized Cost, Net of Allowance for Credit Losses		Fair Value		% of Total Fair Value
1	Aaa/Aa/A	$	4,549.7	$	4,709.3		63.9	%	$	4,590.6	$	4,894.2		65.7	%
2	Baa		2,244.1		2,351.6		31.9			2,075.6		2,258.9		30.3
3	Ba		177.4		185.1		2.5			162.3		173.6		2.3
4	B		111.5		117.1		1.6			109.3		118.3		1.6
5	Caa and lower		6.4		7.1		0.1			7.3		7.7		0.1
6	In or near default		—		0.1		—			0.5		1.7		—
Total fixed maturities		$	7,089.1	$	7,370.3		100.0	%	$	6,945.6	$	7,454.4		100.0	%

Based on ratings by the National Association of Insurance Commissioners (“NAIC”), approximately 96% of the fixed maturity portfolio consisted of investment grade securities at March 31, 2021 and December 31, 2020. The quality of our fixed maturity portfolio remains strong based on ratings, capital structure position, support through guarantees, underlying security, issuer diversification and yield curve position.

Our investment portfolio primarily consists of fixed maturity securities whose fair value is susceptible to market risk, including interest rate changes. See also “Quantitative and Qualitative Disclosures about Market Risk” included in Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our 2020 Annual Report on Form 10-K. Duration is a measurement used to quantify our inherent interest rate risk and analyze invested assets relative to our reserve liabilities.

The duration of our fixed maturity portfolio was as follows:

	March 31, 2021							December 31, 2020
(dollars in millions) Duration	Amortized Cost, Net of Allowance for Credit Losses		Fair Value		% of Total Fair Value			Amortized Cost, Net of Allowance for Credit Losses		Fair Value		% of Total Fair Value
0-2 years	$	1,167.0	$	1,202.8		16.3	%	$	1,460.6	$	1,510.5		20.3	%
2-4 years		1,650.7		1,766.9		24.0			1,738.4		1,872.5		25.1
4-6 years		1,742.6		1,859.0		25.2			1,570.0		1,734.0		23.3
6-8 years		1,200.8		1,249.9		17.0			1,016.6		1,134.0		15.2
8-10 years		1,024.6		991.2		13.4			812.2		837.8		11.2
10+ years		303.4		300.5		4.1			347.8		365.6		4.9
Total fixed maturities	$	7,089.1	$	7,370.3		100.0	%	$	6,945.6	$	7,454.4		100.0	%
Weighted average duration				5.0						4.8

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Our fixed maturity and equity securities are carried at fair value. Financial instruments whose value was determined using significant management judgment or estimation constituted less than 1% of the total assets we measured at fair value. See also Note 4 – “Fair Value” in the Notes to Interim Consolidated Financial Statements.

Equity securities primarily consist of U.S. income-oriented large capitalization common stocks and developed market equity index and corporate bond exchange-traded funds.

Mortgage and other loans consist primarily of commercial mortgage loan participations which represent our interest in commercial mortgage loans originated by a third party. We share, on a pro-rata basis, in all related cash flows of the underlying mortgage loans, which are primarily investment-grade quality and diversified by geographic area and property type.

Other investments consist primarily of our interest in corporate middle market and real estate limited partnerships. Corporate middle market limited partnerships may invest in senior or subordinated debt, preferred or common equity or a combination thereof, of privately-held middle market businesses. Real estate limited partnerships hold equity ownership positions in real properties and invest in debt secured by real properties. Our limited partnerships are generally accounted for under the equity method, or as a practical expedient using the fund’s net asset value, with financial information provided by the partnership on a two or three month lag.

Although we expect to invest new funds primarily in investment grade fixed maturities, we have invested, and expect to continue to invest, a portion of funds in limited partnerships, common equity securities, below investment grade fixed maturities and other investment assets.

Impairments

For the three months ended March 31, 2021, we did not recognize any impairments. For the three months ended March 31, 2020, we recognized $28.5 million of impairments, consisting primarily of $22.2 million on fixed maturities and $4.8 million on mortgage loans. Impairments on fixed maturities included $16.0 million categorized as intend-to-sell and $6.2 million of credit-related losses.

At March 31, 2021 and December 31, 2020, the allowance for credit loses on mortgage loans was $7.9 million. There was no allowance for credit losses on available-for-sale securities as of March 31, 2021, compared to an allowance of $0.1 million at December 31, 2020.

The carrying values of fixed maturity securities on non-accrual status at March 31, 2021 and December 31, 2020 were not material. The effects of non-accruals for the three months ended March 31, 2021 and 2020, compared with amounts that would have been recognized in accordance with the original terms of the fixed maturities, were also not material. Any defaults in the fixed maturities portfolio in future periods may negatively affect investment income.

Unrealized Losses  

Gross unrealized losses on fixed maturities at March 31, 2021 were $58.1 million, an increase of $54.8 million compared to December 31, 2020, primarily attributable to higher interest rates. At March 31, 2021, gross unrealized losses consisted primarily of $20.9 million on corporate fixed maturities, $12.1 million on U. S. government securities, $11.7 million on municipals and $10.4 million on residential mortgage-backed securities.  See Note 3 – “Investments” in the Notes to Interim Consolidated Financial Statements.

We view gross unrealized losses on fixed maturities as non-credit related since it is our assessment that these securities will recover, allowing us to realize their anticipated long-term economic value. Further, we do not intend to sell, nor is it more likely than not we will be required to sell, such debt securities before this expected recovery of amortized cost (See also “Liquidity and Capital Resources”). Inherent in our assessment are the risks that market factors may differ from our expectations; the global economic recovery following the Pandemic takes longer than current expectations; we may decide to subsequently sell a security for unforeseen business needs; or changes in the credit assessment from our original assessment may lead us to determine that a sale at the current value would maximize recovery on such investments. To the extent that there are such adverse changes, an impairment would be recognized as a realized loss. Although unrealized losses on fixed maturities are not reflected in the results of financial operations until they are realized, the fair value of the underlying investment, which does reflect the unrealized loss, is reflected in our Consolidated Balance Sheets.

The following table sets forth gross unrealized losses for fixed maturities by maturity period at March 31, 2021 and December 31, 2020. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties, or we may have the right to put or sell the obligations back to the issuers.

	March 31,		December 31,
(in millions)	2021		2020
Due after one year through five years	$	0.1		—
Due after five years through ten years		21.0		0.5
Due after ten years		23.6		2.0
		44.7		2.5
Mortgage-backed and asset-backed securities		13.4		0.8
Total fixed maturities	$	58.1	$	3.3

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Our investment portfolio and shareholders’ equity can be significantly impacted by changes in market values of our securities. Market volatility could increase and defaults on fixed income securities could occur. As a result, we could incur additional realized and unrealized losses in future periods, which could have a material adverse impact on our results of operations and/or financial position.

Signs of an economic recovery in the U.S. continue to build as COVID-19 vaccinations gain momentum, Federal Reserve monetary policy remains accommodative and approval of a third COVID-19 relief plan, the $1.9 trillion American Rescue Plan, begins to make an impact. Vaccination rates have recently exceeded 3 million doses per day in the U.S. and, while infection rates and virus mutations are still of concern, projected trends have allowed state and local governments to begin the process of gradual re-openings. Unemployment rates remain elevated and while the U.S. government and its agencies have taken extraordinary measures to stabilize the economy through fiscal and monetary policy actions which have muted typical recessionary dynamics, the recovery in the labor market has been uneven. It is unclear whether such actions will be sufficient to support continued economic recovery in the intermediate term, and what long-term effects such unprecedented events will ultimately have on our investment portfolio.   

Due to the Pandemic, global monetary policies remain extremely accommodative in support of financial market stability. Major central banks have lowered interest rates, relaxed collateral requirements and instituted various asset purchase programs to stabilize financial markets and support economic growth. In the U.S., for example, the Federal Reserve (the “Fed”) is maintaining its federal funds target range at 0% to 0.25% and is purchasing unprecedented quantities of assets. The Fed noted that continuation of these policies will need to balance the dual mandate of maximum employment and price stability should inflationary expectations increase, or should other economic conditions change, such as public health and the labor market.

Fundamental conditions in certain corporate sectors remain challenging, such as the energy sector which faces a decline in global demand, and the lodging, restaurant and transportation services subsectors which have been directly impacted by the Pandemic. We may experience defaults on fixed income securities, particularly with respect to non-investment grade debt securities. Although we perform rigorous credit analysis of our fixed income investments, it is difficult to foresee which issuers, industries or markets will be most affected. As a result, the value of our fixed maturity portfolio could change rapidly in ways we cannot currently anticipate, and we could incur additional realized and unrealized losses in future periods.  

Other Items

Net income also included the following items:

	Three Months Ended March 31,
(in millions)	Commercial Lines			Personal Lines			Other		Discontinued Operations			Total
2021
Net realized and unrealized investment gains	$	26.1		$	11.2		$	0.2	$	—		$	37.5
Discontinued life businesses		—			—			—		(0.1	)		(0.1	)
2020
Net realized and unrealized investment gains (losses)	$	(113.8	)	$	(47.9	)	$	0.1	$	—		$	(161.6	)
Discontinued life businesses		—			—			—		(1.3	)		(1.3	)

We manage investment assets for our Commercial Lines, Personal Lines and Other segments based on the requirements of our combined property and casualty insurance companies. We allocate the investment income, expenses and realized gains and losses to our Commercial Lines, Personal Lines and Other segments based on actuarial information related to the underlying businesses.

Net realized and unrealized investment gains were $37.5 million for the three months ended March 31, 2021, compared to net realized and unrealized investment losses of $161.6 million for the three months ended March 31, 2020. For the three months ended March 31, 2021, net realized and unrealized investment gains were primarily due to changes in the fair value of equity securities. For the three months ended March 31, 2020, net realized and unrealized investment gains (losses) were primarily due to changes in the fair value of equity securities and, to a lesser extent, from impairment losses on investments.

Discontinued operations include our discontinued accident and health and life businesses. Losses of $0.1 million and $1.3 million for the three months ended March 31, 2021 and 2020, respectively, primarily reflect adverse loss trends related to the long-term care pool.

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Income Taxes

We file a consolidated U.S. federal income tax return that includes our holding company and its domestic subsidiaries (including non-insurance operations).

Three Months Ended March 31, 2021 Compared to Three Months Ended March 31, 2020

The provision for income taxes from continuing operations was an expense of $21.3 million and a benefit of $15.2 million for the three months ended March 31, 2021 and 2020, respectively. These provisions resulted in consolidated effective federal tax rates of 18.7% and 28.2% for the three months ended March 31, 2021 and 2020, respectively. These provisions reflect benefits related to tax planning strategies implemented in prior years of $1.9 million in both of the three months ended March 31, 2021 and 2020. In addition, these provisions also included excess tax benefits related to stock-based compensation of $1.0 million and $1.9 million for the three months ended March 31, 2021 and 2020, respectively. Absent these items, the provision for income taxes would have been an expense of $24.2 million and a benefit of $11.4 million for the three months ended March 31, 2021 and 2020, respectively, or 21.2% for both periods.

The income tax provision on operating income was an expense of $15.2 million and $20.9 million for the three months ended March 31, 2021 and 2020, respectively. These provisions resulted in effective tax rates for operating income of 19.8% and 19.4% for the three months ended March 31, 2021 and 2020, respectively. These provisions included excess tax benefits related to stock-based compensation of $1.0 million and $1.9 million for the three months ended March 31, 2021 and 2020, respectively. Absent this item, the provision for income taxes would have been an expense of $16.2 million, or 21.1%, and $22.8 million, or 21.2%, for the three months ended March 31, 2021 and 2020, respectively.

Critical Accounting Estimates

Interim consolidated financial statements have been prepared in conformity with U.S. GAAP and include certain accounting policies that we consider to be critical due to the amount of judgment and uncertainty inherent in the application of those policies. While we believe that the amounts included in our consolidated financial statements reflect our best judgment, the use of different assumptions could produce materially different accounting estimates. As disclosed in our 2020 Annual Report on Form 10-K, we believe the following accounting estimates are critical to our operations and require the most subjective and complex judgment:

• Reserve for losses and loss expenses

• Reinsurance recoverable balances

• Pension benefit obligations

• Investment credit losses

• Deferred taxes

For a more detailed discussion of these critical accounting estimates, see our 2020 Annual Report on Form 10-K.

Statutory Surplus of Insurance Subsidiaries

The following table reflects statutory surplus for our insurance subsidiaries:

	March 31,		December 31,
(in millions)	2021		2020
Total Statutory Capital and Surplus	$	2,667.7	$	2,588.5

The statutory capital and surplus for our insurance subsidiaries increased $79.2 million during the first three months of 2021. This increase was primarily due to underwriting profits and from net realized and unrealized investment gains, primarily due to changes in the fair value of equity securities.

The NAIC prescribes an annual calculation regarding risk-based capital (“RBC”). RBC ratios for regulatory purposes are expressed as a percentage of the capital required to be above the Authorized Control Level (the “Regulatory Scale”); however, in the insurance industry, RBC ratios are widely expressed as a percentage of the Company Action Level. The following table reflects the Company Action Level, the Authorized Control Level and RBC ratios for Hanover Insurance (which includes Citizens and other insurance subsidiaries), as of March 31, 2021, expressed both on the Industry Scale (Total Adjusted Capital divided by the Company Action Level) and Regulatory Scale (Total Adjusted Capital divided by Authorized Control Level):

(dollars in millions)	Company Action Level		Authorized Control Level		RBC Ratio Industry Scale			RBC Ratio Regulatory Scale
The Hanover Insurance Company	$	1,107.6	$	553.8		240	%		480	%

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Liquidity and Capital Resources

Liquidity is a measure of our ability to generate sufficient cash flows to meet the cash requirements of business operations. As a holding company, our primary ongoing source of cash is dividends from our insurance subsidiaries. However, dividend payments to us by our insurance subsidiaries are subject to limitations imposed by regulators, such as prior notice periods and the requirement that dividends in excess of a specified percentage of statutory surplus or prior year’s statutory earnings receive prior approval (so called “extraordinary dividends”). During the first quarter of 2021, Hanover Insurance did not pay dividends to the holding company.

Sources of cash for our insurance subsidiaries primarily consist of premiums collected, investment income and maturing investments. Primary cash outflows are payments for losses and loss adjustment expenses, policy and contract acquisition expenses, other underwriting expenses and investment purchases. Cash outflows related to losses and loss adjustment expenses can be variable because of uncertainties surrounding settlement dates for liabilities for unpaid losses and because of the potential for large losses either individually or in the aggregate. We periodically adjust our investment policy to respond to changes in short-term and long-term cash requirements.

Net cash provided by operating activities was $141.8 million during the first three months of 2021, as compared to $36.6 million during the first three months of 2020. The $105.2 million increase in cash provided was primarily due to an increase in premiums received and a decrease in loss payments in the first three months of 2021, compared to the first three months of 2020.

Net cash used in investing activities was $78.6 million during the first three months of 2021, as compared to $99.9 million during the first three months of 2020. During the first three months of 2021, cash used in investing activities primarily related to net purchases of fixed maturities. During the first three months of 2020, cash used in investing activities primarily related to net purchases of fixed maturities and, to a lesser extent, equity securities and other investments.

Net cash used in financing activities was $71.7 million during the first three months of 2021, as compared to $8.5 million during the first three months of 2020. During the first three months of 2021 and 2020, cash used in financing activities primarily resulted from the repurchase of common stock and for the quarterly dividend payment to our shareholders. The payments made in the first quarter of 2020 were partially offset by short-term borrowings.

Dividends to common shareholders are subject to quarterly board approval and declaration. During the first three months of 2021, as declared by the Board, we paid a quarterly dividend of $0.70 per share to our shareholders totaling approximately $25.5 million. We believe that our holding company assets are sufficient to provide for future shareholder dividends should the Board of Directors declare them.

At March 31, 2021, THG, as a holding company, held approximately $326.2 million of fixed maturities and cash. We believe our holding company assets will be sufficient to meet our current year obligations, which we expect to consist primarily of quarterly dividends to our shareholders (as and to the extent declared), interest on our senior and subordinated debentures, certain costs associated with benefits due to our former life employees and agents, and, to the extent required, payments related to indemnification of liabilities associated with the sale of various subsidiaries. As discussed below, we have, and opportunistically may continue to, repurchase our common stock and our debt. We do not expect that it will be necessary to dividend additional funds from our insurance subsidiaries in order to fund 2021 holding company obligations; however, we may decide to do so.

We expect to continue to generate sufficient positive operating cash to meet all short-term and long-term cash requirements relating to current operations, including the funding of our qualified defined benefit pension plan. The ultimate payment amounts for our benefit plan is based on several assumptions, including but not limited to, the rate of return on plan assets, the discount rate for benefit obligations, mortality experience, interest crediting rates, inflation and the ultimate valuation and determination of benefit obligations. Since differences between actual plan experience and our assumptions are almost certain, changes, both positive and negative, to our current funding status and ultimately our obligations in future periods are likely.

Our insurance subsidiaries maintain a high degree of liquidity within their respective investment portfolios in fixed maturity and short-term investments. We believe that the quality of the assets we hold will allow us to realize the long-term economic value of our portfolio, including securities that are currently in an unrealized loss position. We do not anticipate the need to sell these securities to meet our insurance subsidiaries’ cash requirements since we expect our insurance subsidiaries to generate sufficient operating cash to meet all short-term and long-term cash requirements relating to current operations. However, there can be no assurance that unforeseen business needs or other items will not occur causing us to have to sell those securities in a loss position before their values fully recover, thereby causing us to recognize impairment charges in that time period.

The Board of Directors has authorized a stock repurchase program which provides for aggregate repurchases of our common stock of up to $900 million. Under the repurchase authorization, we may repurchase, from time to time, common stock in amounts, at prices and at such times as we deem appropriate, subject to market conditions and other considerations. Repurchases may be executed using open market purchases, privately negotiated transactions, accelerated repurchase programs or other transactions. We are not required to purchase any specific number of shares or to make purchases by any certain date under this program. On October 29, 2020, pursuant to the terms of an accelerated share repurchase (“ASR”) agreement (the “October 2020 ASR”), we paid $100.0 million in exchange for shares of our common stock. We received an initial share delivery, of approximately 0.8 million shares of common stock, which was approximately 80% of the total number of shares expected to be repurchased under the October 2020 ASR

37

agreement. On January 29, 2021, we received approximately 45,000 shares of our common stock as final settlement of shares repurchased under the October 2020 ASR. In addition to the shares repurchased under the October 2020 ASR, during the first three months of 2021 we repurchased approximately 0.4 million shares at an aggregate cost of $45.3 million. As of March 31, 2021, we had repurchased 6.8 million shares under this $900 million program and had approximately $78 million available for additional repurchases.

We maintain our membership in the Federal Home Loan Bank (“FHLB”) to provide access to additional liquidity based on our holdings of FHLB stock and pledged collateral. At March 31, 2021, we had borrowing capacity of $130.1 million. There were no outstanding borrowings under this short-term facility at March 31, 2021; however, we have and may continue to borrow, from time to time, through this facility to provide short-term liquidity.

On April 30, 2019, we entered into a credit agreement that provides for a five-year unsecured revolving credit facility not to exceed $200.0 million at any one time outstanding, with the option to increase the facility up to $300.0 million (assuming no default and satisfaction of other specified conditions, including the receipt of additional lender commitments). The agreement also includes an uncommitted subfacility of $50.0 million for standby letters of credit.  Borrowings, if any, under this agreement are unsecured and incur interest at a rate per annum equal to, at our election, either (i) the greater of, (a) the prime commercial lending rate of the administrative agent, (b) the NYFRB Rate plus half a percent, or (c) the one month Adjusted LIBOR plus one percent and a margin that ranges from 0.25% to 0.625% depending on our debt rating, or (ii) Adjusted LIBOR for the applicable interest period, plus a margin that ranges from 1.25% to 1.625% depending on our debt rating. The agreement also contains certain financial covenants such as maintenance of specified levels of consolidated equity and leverage ratios, and requires that certain of our subsidiaries maintain minimum RBC ratios.  We currently have no borrowings under this agreement and had no borrowings under this agreement during the first three months of 2021. The LIBOR rate, upon which Adjusted LIBOR is based, is expected to be discontinued by the end of 2021.  Our credit agreement permits us to agree with the Administrative Agent for the credit facility on a replacement to Adjusted LIBOR subject to the satisfaction of certain conditions.

At March 31, 2021, we were in compliance with the covenants of our debt and credit agreements.

Off-Balance Sheet Arrangements

We currently do not have any material off-balance sheet arrangements that are reasonably likely to have an effect on our financial position, revenues, expenses, results of operations, liquidity, capital expenditures, or capital resources.

Contingencies and Regulatory Matters

REGULATORY AND INDUSTRY DEVELOPMENTS

In response to the Pandemic, regulators in many of the states in which we operate have issued orders or guidance pertaining to, among other things, (a) premium refunds, credits or reductions for personal automobile insurance premiums and premiums for other insurance lines that regulators have determined are disproportionately impacted by the Pandemic, including certain commercial lines, for the periods during which governmental restrictions were or remain in effect, with premium adjustments based on factors such as the ongoing frequency and severity of claims, inflation, repair costs and reinsurance pricing, among others; (b) premium payment grace periods, moratoriums on policy non-renewals and cancellations, and other measures that are similar to actions historically implemented in regions heavily impacted by catastrophes, which we anticipate to be manageable, depending on the duration of the regulatory orders and the degree to which policyholder payment patterns vary as a result; and (c) a reassessment of rates in light of current exposures, loss experience and economic conditions. Regulatory restrictions on rate increases, underwriting, policy terms, and the ability to non-renew business may, depending on their duration, limit THG’s ability to manage our mix of business and any potential exposures that emerge in our lines of business in the near term.

Draft legislation has been proposed in several state legislatures and/or in the United States Congress that seeks to require insurers to retroactively pay unfunded Pandemic business interruption claims that insurance policies do not currently cover, to impose presumptions on insurance policy interpretation, and/or to mandate prospective pandemic coverage.  The impact of such legislation, were it to be adopted, would, according to a statement of the NAIC on March 25, 2020, “create substantial solvency risks” for the property and casualty insurance sector, “significantly undermine the ability of insurers to pay other types of claims, and potentially exacerbate the negative financial and economic impacts the country is currently experiencing.”  Industry trade groups further assert that any such legislation would be violative of basic contract law and well-founded principles of constitutional law.  Federal stimulus plans such as the CARES Act and the American Rescue Plan Act of 2021 providing financial support to individuals and businesses during the Pandemic may mitigate the political pressure to continue advancing such proposed legislation.

Proposals are also being considered at the federal level to establish government-funded pandemic insurance programs, possibly similar to the federal terrorism risk insurance program.  Discussion on such competing proposals is ongoing and at a preliminary stage such that it is too early to estimate their potential impact, if any, on our business.

Information regarding litigation, legal contingencies and regulatory matters appears in Part I – Note 12 “Commitments and Contingencies” in the Notes to Interim Consolidated Financial Statements.

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Risks and Forward-Looking Statements

Information regarding risk factors and forward-looking information appears in Part II – Item 1A of this Quarterly Report on Form 10-Q and in Part I – Item 1A of our 2020 Annual Report on Form 10-K. This Management’s Discussion and Analysis should be read and interpreted in light of such factors.

ITEM 3

QUANTITATIVE AND QUALITATIVE DISCLOSURES

ABOUT MARKET RISK

Our market risks, the ways we manage them, and sensitivity to changes in interest rates, and equity price risk are summarized in Management’s Discussion and Analysis of Financial Condition and Results of Operations as of December 31, 2020,  included in our Annual Report on Form 10-K for the year ended December 31, 2020.  There have been no material changes in the first three months of 2021 to these risks or our management of them.

ITEM 4

CONTROLS AND PROCEDURES

Disclosure Controls and Procedures Evaluation

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of our “disclosure controls and procedures,” as such term is defined under Rule 13a-15(e) promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Limitations on the Effectiveness of Controls

Our management, including our Chief Executive Officer and Chief Financial Officer, do not expect that our disclosure controls over financial reporting will prevent all error and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Controls can also be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls is based in part on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with policies or procedures. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Based on our controls evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of the end of the period covered by this quarterly report, our disclosure controls and procedures were effective to provide reasonable assurance that (i) the information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and (ii) material information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate “internal control over financial reporting,” as such term is defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting, as required by Rule 13a-15(d) of the Exchange Act, to determine whether any changes occurred during the period covered by this quarterly report on Form 10-Q that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. Based on the that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that there were no such changes during the quarter ended March 31, 2021, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting. 

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PART II – OTHER INFORMATION

ITEM 1 – LEGAL PROCEEDINGS

The Company has been named a defendant in various legal proceedings arising in the normal course of business. In addition, the Company is involved, from time to time, in examinations, investigations and proceedings by governmental and self-regulatory agencies. The potential outcome of any such action or regulatory proceedings in which the Company has been named a defendant or the subject of an inquiry, examination or investigation, and its ultimate liability, if any, from such actions or regulatory proceedings, is difficult to predict at this time. The ultimate resolutions of such proceedings are not expected to have a material effect on the Company’s financial position, although they could have a material effect on the results of operations for a particular quarterly or annual period.

ITEM 1A – RISK FACTORS

This document contains, and management may make, certain “forward-looking statements” as defined in the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, may be forward-looking statements. When used in our Management’s Discussion and Analysis, words such as: “believes,” “anticipates,” “expects,” “projections,” “outlook,” “should,” “could,” “plan,” “guidance,” “likely,” “on track to,” “potential,” “continue,” “targeted,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements by their nature address matters that are, to different degrees, uncertain. We caution readers that accuracy with respect to forward-looking projections is difficult and subject to risks and uncertainties. Those risks and uncertainties, in some cases, have affected, and in the future could affect, our actual results and could cause our actual results for the remainder of 2021 and beyond to differ materially from historical results and from those expressed in any of our forward-looking statements. We operate in a business environment that is continually changing, and as such, new risk factors may emerge over time. Additionally, our business is conducted in competitive markets and, therefore, involves a higher degree of risk. We cannot predict these new risk factors nor can we assess the impact, if any, that they may have on our business in the future.

Some of the factors that could cause actual results to differ include, but are not limited to, the following:

• changes in the demand for our products;

• risks and uncertainties with respect to our ability to retain profitable policies in force and attract profitable policies and to increase rates commensurate with, or in excess of, loss trends;

• adverse claims experience or changes in our estimates of loss and loss adjustment expense reserves, including with respect to catastrophes, which may result in lower current year underwriting income or adverse loss development, and could impact our carried reserves;  

• uncertainties with respect to the long-term profitability of our products, including with respect to newer products such as our Hanover Platinum Personal Lines and excess and surplus lines, or longer-tail products covering casualty losses;

• disruption in our distribution channels, including the loss or disruption of our independent agency channel, including the impact of competition and consolidation in the industry and among agents and brokers;

• changes in frequency and loss severity trends;

• changes in regulation, legislation, economic, market and political conditions, particularly with respect to rates, policy terms and conditions, payment flexibility, and regions where we have geographical concentrations;

• volatile and unpredictable developments, including severe weather and other natural physical events, catastrophes, pandemics, civil unrest, and terrorist actions, and the uncertainty in estimating the resulting losses;

• changes in weather patterns, whether as a result of global climate change, or otherwise, causing a higher level of losses from weather events to persist;

• limitations on the physical ability to adjust claims or the availability of sufficient information to accurately estimate a loss at a point in time and the limitations and assumptions used to model property and casualty losses in general;

• risks and uncertainties with respect to our ability to collect all amounts due from reinsurers and to maintain current levels of reinsurance in the future at commercially reasonable rates, or at all;

• heightened volatility, fluctuations in interest rates (which have a significant impact on the market value of our investment portfolio and thus our book value), inflationary pressures, default rates and other factors that affect investment returns from our investment portfolio;

• risks and uncertainties associated with our participation in shared market mechanisms, mandatory reinsurance programs and mandatory and voluntary pooling arrangements, including the MCCA;

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• an increase in mandatory assessments by state guaranty funds;

• risks and uncertainties associated with the Michigan legislation that took effect on July 2, 2020 and reformed the prior requirements that all personal and commercial automobile polices issued in the state include no-fault personal injury protection coverage without a cap on maximum benefits allowed and the resulting increase in litigation challenging or associated with this reform;

• actions by our competitors, many of which are larger or have greater financial resources than we do;

• loss, prolonged illness or retirement of key employees;

• operating difficulties and other unintended consequences from the introduction of new products and related technology changes and applications, as well as new operating models;

• changes in our claims-paying and financial strength ratings;

• negative changes in our level of statutory surplus;

• risks and uncertainties with respect to our growth or operating strategies, or with respect to our expense and strategic initiatives;

• our ability to declare and pay dividends;

• changes in accounting principles and related financial reporting requirements;

• errors or omissions in connection with the administration of any of our products;

• risks and uncertainties with our operations and technology, including cloud-based data information storage, data security, cyber-security attacks, remote working capabilities, and/or outsourcing relationships and third-party operations and data security that may negatively impact our ability to conduct business;

• an inability to be compliant with recently implemented regulations or existing regulation such as those relating to Sarbanes-Oxley;

• unfavorable developments as a result of the implementation of the enacted legislation in Michigan described above, or litigation matters, social inflation and the possibility of adverse judicial decisions, including those which expand policy coverage beyond its intended scope or award “bad faith” or other non-contractual damages;

• continuing risks and uncertainties associated with the impact of the COVID-19 Pandemic and related general economic conditions; and

• other factors described in such forward-looking statements.

In addition, historical and future reported financial results include estimates with respect to premiums written and earned, reinsurance recoverables, current accident year “picks,” loss and loss adjustment reserves and development, fair values of certain investments, other assets and liabilities, tax, contingent and other liabilities, and other items. These estimates are subject to change as more information becomes available.

Readers should not place undue reliance on forward-looking statements, which speak only as of the date they are made. We do not undertake any responsibility to update or revise our forward-looking statements, except as required by law.

For a more detailed discussion of our risks and uncertainties, see also Item 1A – Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2020.     

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

Issuer Purchases of Equity Securities

Shares purchased in the first quarter of 2021 are as follows:  

					Total Number of		Approximate Dollar Value of
					Shares Purchased as		Shares That May Yet
					Part of Publicly		be Purchased Under the
	Total Number of		Average Price		Announced Plans or		Plans or Programs
Period	Shares Purchased(1)		Paid per Share		Programs		(in millions)
January 1 - 31, 2021(2)		45,158	$	112.52		44,828	$	124
February 1 - 28, 2021		25,000		116.94		25,000		121
March 1 - 31, 2021		383,334		126.45		332,671		78
Total		453,492	$	124.54		402,499	$	78

(1) Includes 330 shares and 50,663 shares withheld to satisfy tax withholding amounts due from employees related to the receipt of stock which resulted from the exercise or vesting of equity awards for the months ended January 31 and March 31, 2021, respectively.

(2) Includes 44,828 shares of common stock received as final settlement of the October 2020 ASR.

42

ITEM 6 – EXHIBITS

EX – 31.1	Certification of the Chief Executive Officer, pursuant to 15 U.S.C. 78m, 78o(d), as adopted pursuant to section 302 of the Sarbanes-Oxley Act of 2002.
EX – 31.2	Certification of the Chief Financial Officer, pursuant to 15 U.S.C. 78m, 78o(d), as adopted pursuant to section 302 of the Sarbanes-Oxley Act of 2002.
EX – 32.1	Certification of the Chief Executive Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002.
EX – 32.2	Certification of the Chief Financial Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002.
EX – 101	The following materials from The Hanover Insurance Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 formatted in Inline eXtensible Business Reporting Language (“iXBRL”): (i) Consolidated Statements of Income for the three months ended March 31, 2021 and 2020; (ii) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020; (iii) Consolidated Balance Sheets at March 31, 2021 and December 31, 2020; (iv) Consolidated Statements of Shareholders’ Equity for the three months ended March 31, 2021 and 2020; (v) Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020, and (vi) related notes to these financial statements.
EX – 104	The cover page from The Hanover Insurance Group Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in iXBRL (embedded within EX – 101).

43

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.

	The Hanover Insurance Group, Inc.
	Registrant
April 30, 2021	/s/ John C. Roche
Date	John C. Roche
	President, Chief Executive Officer and Director
April 30, 2021	/s/ Jeffrey M. Farber
Date	Jeffrey M. Farber
	Executive Vice President and Chief Financial Officer

44

EX-31.1

Exhibit 31.1

CERTIFICATION AS ADOPTED PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, John C. Roche, certify that:

1. I have reviewed this quarterly report on Form 10-Q of The Hanover Insurance Group, Inc.;

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(s) 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 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(s) 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: April 30, 2021

/s/ John C. Roche

John C. Roche

President, Chief Executive Officer and Director

EX-31.2

Exhibit 31.2

CERTIFICATION AS ADOPTED PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Jeffrey M. Farber, certify that:

1. I have reviewed this quarterly report on Form 10-Q of The Hanover Insurance Group, Inc.;

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(s) 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 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(s) 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: April 30, 2021

/s/ Jeffrey M. Farber

Jeffrey M. Farber

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as President, Chief Executive Officer and Director of The Hanover Insurance Group, Inc. (the “Company”), does hereby certify that to the undersigned’s knowledge:

1) the Company’s Quarterly Report on Form 10-Q for the period ended March 31, 2021 (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 Company’s Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ John C. Roche

John C. Roche

President, Chief Executive Officer and

Director

Dated: April 30, 2021

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as Executive Vice President and Chief Financial Officer of The Hanover Insurance Group, Inc. (the “Company”), does hereby certify that to the undersigned’s knowledge:

1) the Company’s Quarterly Report on Form 10-Q for the period ended March 31, 2021 (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 Company’s Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Jeffrey M. Farber

Jeffrey M. Farber

Executive Vice President and

Chief Financial Officer

Dated: April 30, 2021

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	HANOVER INSURANCE GROUP, INC.
Entity Central Index Key	0000944695
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		35,896,848
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-13754
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3263626
Entity Address, Address Line One	440 Lincoln Street
Entity Address, City or Town	Worcester
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01653
City Area Code	508
Local Phone Number	855-1000
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Common Stock, $.01 Par Value [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	THG
Security Exchange Name	NYSE
7 5/8% Senior Debentures Due 2025 [Member]
Document Information [Line Items]
Title of 12(b) Security	7 5/8% Senior Debentures due 2025
Trading Symbol	THG
Security Exchange Name	NYSE

XML

Consolidated Statements of Income - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Premiums	$ 1,161,800,000	$ 1,141,400,000
Net investment income	76,800,000	69,600,000
Net realized and unrealized investment gains (losses):
Net realized gains (losses) from sales and other	(1,600,000)	3,100,000
Net change in fair value of equity securities	39,100,000	(136,200,000)
Impairment losses on investments	0	(28,500,000)
Total net realized and unrealized investment gains (losses)	37,500,000	(161,600,000)
Fees and other income	7,200,000	6,800,000
Total revenues	1,283,300,000	1,056,200,000
Losses and expenses
Losses and loss adjustment expenses	781,300,000	728,200,000
Amortization of deferred acquisition costs	240,300,000	236,900,000
Interest expense	8,500,000	9,400,000
Other operating expenses	139,100,000	135,600,000
Total losses and expenses	1,169,200,000	1,110,100,000
Income (loss) from continuing operations before income taxes	114,100,000	(53,900,000)
Income tax expense (benefit):
Current	8,900,000	21,300,000
Deferred	12,400,000	(36,500,000)
Total income tax expense (benefit)	21,300,000	(15,200,000)
Income (loss) from continuing operations	92,800,000	(38,700,000)
Discontinued operations (net of taxes):
Net income (loss)	$ 92,700,000	$ (40,000,000.0)
Basic:
Income (loss) from continuing operations	$ 2.55	$ (1.01)
Net income (loss) per share	$ 2.55	$ (1.04)
Weighted average shares outstanding	36.4	38.3
Diluted:
Income (loss) from continuing operations	$ 2.52	$ (1.01)
Net income (loss) per share	$ 2.51	$ (1.04)
Weighted average shares outstanding	36.9	38.3
Life [Member]
Discontinued operations (net of taxes):
Income (Loss) from discontinued operations	$ (100,000)	$ (1,300,000)
Basic:
Loss from discontinued operations		$ (0.03)
Diluted:
Income (Loss) from discontinued operations	$ (0.01)	$ (0.03)

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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 92.7	$ (40.0)
Changes in net unrealized losses on investment securities:
Having no credit losses recognized in the Consolidated Statements of Income	(185.5)	(70.8)
Having credit losses recognized in the Consolidated Statements of Income		(12.4)
Total available-for-sale securities	(185.5)	(83.2)
Pension and postretirement benefits:
Net change in net actuarial loss	0.7	1.2
Total other comprehensive loss, net of tax	(184.8)	(82.0)
Comprehensive loss	$ (92.1)	$ (122.0)

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Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Fixed maturities, at fair value (amortized cost of $7,089.1 and $6,945.6)	$ 7,370.3	$ 7,454.4
Equity securities, at fair value	641.0	598.5
Other investments	793.2	793.2
Total investments	8,804.5	8,846.1
Cash and cash equivalents	112.1	120.6
Accrued investment income	48.0	51.2
Premiums and accounts receivable, net	1,369.6	1,339.3
Reinsurance recoverable on paid and unpaid losses and unearned premiums	1,882.9	1,874.3
Deferred acquisition costs	491.0	477.5
Goodwill	178.8	178.8
Other assets	461.5	445.7
Assets of discontinued businesses	99.6	110.2
Total assets	13,448.0	13,443.7
Liabilities
Loss and loss adjustment expense reserves	6,223.7	6,024.0
Unearned premiums	2,553.1	2,482.7
Expenses and taxes payable	601.8	687.5
Deferred income tax liability	64.0	97.3
Reinsurance premiums payable	57.3	48.4
Debt	781.0	780.8
Liabilities of discontinued businesses	120.3	120.8
Total liabilities	10,401.2	10,241.5
Commitments and contingencies
Shareholders’ Equity
Preferred stock, par value $0.01 per share; 20.0 million shares authorized; none issued
Common stock, par value $0.01 per share; 300.0 million shares authorized; 60.5 million shares issued	0.6	0.6
Additional paid-in capital	1,864.0	1,857.4
Accumulated other comprehensive income	187.7	372.5
Retained earnings	2,734.9	2,668.0
Treasury stock at cost (24.3 million and 24.1 million shares)	(1,740.4)	(1,696.3)
Total shareholders’ equity	3,046.8	3,202.2
Total liabilities and shareholders’ equity	$ 13,448.0	$ 13,443.7

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 7,089.1	$ 6,945.6
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000.0	20,000,000.0
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000.0	300,000,000.0
Common stock, shares issued	60,500,000	60,500,000
Treasury stock, shares	24,300,000	24,100,000

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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Net Unrealized Appreciation (Depreciation) on Investments [Member]	Defined Benefit Pension and Postretirement Plans [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]
Balance at beginning of period at Dec. 31, 2019		$ 0.6	$ 1,837.3	$ 216.0	$ (63.4)	$ 2,410.9	$ (0.9)	$ 2,410.0
Balance at beginning of period at Dec. 31, 2019									$ (1,485.2)
Net income (loss)	$ (40.0)					(40.0)
Shares purchased at cost									(59.2)
Settlement and prepayment of accelerated share repurchases and other			24.3
Net depreciation on available-for-sale securities	(83.2)			(83.2)
Net amount recognized as net periodic benefit					1.2
Dividends to shareholders						(25.1)
Net shares reissued at cost under employee stock-based compensation plans									3.3
Balance at end of period at Mar. 31, 2020	2,736.6	0.6	1,861.6	132.8	(62.2)	2,344.9				$ 70.6
Balance at end of period at Mar. 31, 2020									(1,541.1)
Balance at beginning of period at Dec. 31, 2020	3,202.2	0.6	1,857.4	428.1	(55.6)	2,668.0		$ 2,668.0
Balance at beginning of period at Dec. 31, 2020	(1,696.3)								(1,696.3)
Net income (loss)	92.7					92.7
Shares purchased at cost									(50.3)
Settlement and prepayment of accelerated share repurchases and other			6.6
Net depreciation on available-for-sale securities	(185.5)			(185.5)
Net amount recognized as net periodic benefit					0.7
Dividends to shareholders						(25.8)
Net shares reissued at cost under employee stock-based compensation plans									6.2
Balance at end of period at Mar. 31, 2021	3,046.8	$ 0.6	$ 1,864.0	$ 242.6	$ (54.9)	$ 2,734.9				$ 187.7
Balance at end of period at Mar. 31, 2021	$ (1,740.4)								$ (1,740.4)

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities
Net income (loss)	$ 92.7	$ (40.0)
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized and unrealized investment (gains) losses	(38.3)	162.4
Net amortization and depreciation	3.8	5.1
Stock-based compensation expense	5.6	5.0
Amortization of defined benefit plan costs	0.8	1.5
Deferred income tax expense (benefit)	12.6	(36.7)
Change in deferred acquisition costs	(13.5)	1.7
Change in premiums receivable, net of reinsurance premiums payable	(21.3)	(5.5)
Change in loss, loss adjustment expense and unearned premium reserves	270.5	75.0
Change in reinsurance recoverable	(8.5)	(6.4)
Change in expenses and taxes payable	(143.6)	(112.7)
Other, net	(19.0)	(12.8)
Net cash provided by operating activities	141.8	36.6
Cash Flows From Investing Activities
Proceeds from disposals and maturities of fixed maturities	528.0	316.3
Proceeds from disposals of equity securities and other investments	66.5	73.2
Purchase of fixed maturities	(617.2)	(376.5)
Purchase of equity securities and other investments	(53.6)	(109.7)
Capital expenditures	(2.3)	(3.2)
Net cash used in investing activities	(78.6)	(99.9)
Cash Flows From Financing Activities
Proceeds from exercise of employee stock options	5.8	3.0
Proceeds from short-term borrowings		54.0
Dividends paid to shareholders	(25.5)	(24.8)
Repurchases of common stock	(45.3)	(34.9)
Other financing activities	(6.7)	(5.8)
Net cash used in financing activities	(71.7)	(8.5)
Net change in cash and cash equivalents	(8.5)	(71.8)
Cash and cash equivalents, beginning of period	120.6	215.7
Cash and cash equivalents, end of period	$ 112.1	$ 143.9

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Basis of Presentation and Principles of Consolidation

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Basis of Presentation and Principles of Consolidation

1. Basis of Presentation and Principles of Consolidation

The accompanying unaudited consolidated financial statements of The Hanover Insurance Group, Inc. and its subsidiaries (“THG” or the “Company”) have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the requirements of Form 10-Q. Certain financial information that is provided in annual financial statements, but is not required in interim reports, has been omitted.

The interim consolidated financial statements of THG include the accounts of The Hanover Insurance Company (“Hanover Insurance”) and Citizens Insurance Company of America, THG’s principal property and casualty insurance companies; and other insurance and non-insurance subsidiaries. These legal entities conduct their operations through several business segments discussed in Note 8 – “Segment Information.” The interim consolidated financial statements also include the Company’s discontinued operations, consisting of the Company’s former accident and health and life insurance businesses. All intercompany accounts and transactions have been eliminated.

The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amount of revenues and expenses during the reporting period. Actual results could differ from those estimates.

In the opinion of the Company’s management, the accompanying interim consolidated financial statements reflect all adjustments, consisting of normal recurring items, necessary for a fair presentation of the financial position and results of operations. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 24, 2021.

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New Accounting Pronouncements

3 Months Ended

Mar. 31, 2021

Accounting Changes And Error Corrections [Abstract]

New Accounting Pronouncements

2. New Accounting Pronouncements

Recently Implemented Standards

In October 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Codification (“ASC”) Update No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables – Nonrefundable Fees and Other Costs. This guidance clarifies, for each reporting period, that an entity should reevaluate whether a callable debt security with multiple call dates is required to amortize any premium to the next call date. The updated guidance is effective for annual and interim periods beginning after December 15, 2020 and should be applied on a prospective basis as of the beginning of the period of adoption for existing or newly purchased callable debt securities. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.

In January 2020, the FASB issued ASC Update No. 2020-01, Investments – Equity Securities (Topic 321), Investments – Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815). This ASC update clarifies that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting when using the measurement alternative under ASC 321. This update also clarifies the accounting for certain forward contracts and purchased options accounted for under ASC 815. The updated guidance is effective for annual and interim periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.  

In December 2019, the FASB issued ASC Update No. 2019-12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes. This ASC update removes certain exceptions to the general principles in ASC 740, Income Taxes, including intraperiod tax allocation when there is a loss from continuing operations, foreign subsidiary treatment under certain conditions and for calculating interim income taxes when the year-to-date loss exceeds the anticipated loss. This update also clarifies and amends existing guidance related to changes in tax laws, business combinations and employee stock plans, among others. The updated guidance is effective for interim and annual periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.   

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Investments

3 Months Ended

Mar. 31, 2021

Investments Debt And Equity Securities [Abstract]

Investments

3. Investments

A. Fixed maturities

The amortized cost and fair value of available-for-sale fixed maturities were as follows:

	March 31, 2021
					Amortized Cost,
			Allowance		Net of Allowance		Gross		Gross
	Amortized		for Credit		for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses		Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	360.7	$	—	$	360.7	$	11.1	$	12.1	$	359.7
Foreign government		2.2		—		2.2		0.4		—		2.6
Municipal		1,046.3		—		1,046.3		38.5		11.7		1,073.1
Corporate		3,908.6		—		3,908.6		227.5		20.9		4,115.2
Residential mortgage-backed		981.5		—		981.5		23.1		10.4		994.2
Commercial mortgage-backed		722.8		—		722.8		36.7		3.0		756.5
Asset-backed		67.0		—		67.0		2.0		—		69.0
Total fixed maturities	$	7,089.1	$	—	$	7,089.1	$	339.3	$	58.1	$	7,370.3

	December 31, 2020
						Amortized Cost,
			Allowance			Net of Allowance		Gross		Gross
	Amortized		for Credit			for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses			Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	376.4	$	—		$	376.4	$	17.6	$	2.0	$	392.0
Foreign government		2.2		—			2.2		0.5		—		2.7
Municipal		1,042.1		—			1,042.1		61.7		0.1		1,103.7
Corporate		3,770.0		(0.1	)		3,769.9		341.8		0.4		4,111.3
Residential mortgage-backed		978.2		—			978.2		33.1		0.6		1,010.7
Commercial mortgage-backed		705.4		—			705.4		54.8		0.2		760.0
Asset-backed		71.4		—			71.4		2.6		—		74.0
Total fixed maturities	$	6,945.7	$	(0.1	)	$	6,945.6	$	512.1	$	3.3	$	7,454.4

The Company deposits funds with various state and governmental authorities. For a discussion of the Company’s deposits with state and governmental authorities, see also Note 3 – “Investments” in the Notes to Consolidated Financial Statements in the Company’s 2020 Annual Report on Form 10-K.  

The amortized cost and fair value by maturity periods for fixed maturities are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, or the Company may have the right to put or sell the obligations back to the issuers.

	March 31, 2021
	Amortized Cost, Net
	of Allowance for		Fair
(in millions)	Credit Losses		Value
Due in one year or less	$	273.7	$	277.3
Due after one year through five years		1,820.5		1,945.4
Due after five years through ten years		2,461.1		2,575.1
Due after ten years		762.5		752.8
		5,317.8		5,550.6
Mortgage-backed and asset-backed securities		1,771.3		1,819.7
Total fixed maturities	$	7,089.1	$	7,370.3

B. Fixed maturity securities in an unrealized loss position

The following tables provide information about the Company’s available-for-sale fixed maturity securities that were in an unrealized loss position at March 31, 2021 and December 31, 2020, including the length of time the securities have been in an unrealized loss position:

	March 31, 2021
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	12.1	$	171.5	$	—	$	—	$	12.1	$	171.5
Municipal		11.7		372.9		—		0.5		11.7		373.4
Corporate		19.5		515.1		—		—		19.5		515.1
Residential mortgage-backed		10.4		405.2		—		0.1		10.4		405.3
Commercial mortgage-backed		3.0		84.1		—		1.0		3.0		85.1
Asset-backed		—		4.6		—		—		—		4.6
Total investment grade		56.7		1,553.4		—		1.6		56.7		1,555.0
Below investment grade:
Corporate		1.4		64.6		—		—		1.4		64.6
Total fixed maturities	$	58.1	$	1,618.0	$	—	$	1.6	$	58.1	$	1,619.6

	December 31, 2020
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	2.0	$	140.7	$	—	$	—	$	2.0	$	140.7
Municipal		0.1		19.3		—		0.7		0.1		20.0
Corporate		0.4		53.4		—		—		0.4		53.4
Residential mortgage-backed		0.6		94.4		—		—		0.6		94.4
Commercial mortgage-backed		0.2		33.2		—		—		0.2		33.2
Total investment grade		3.3		341.0		—		0.7		3.3		341.7
Below investment grade:
Corporate		—		4.6		—		—		—		4.6
Total fixed maturities	$	3.3	$	345.6	$	—	$	0.7	$	3.3	$	346.3

The Company views gross unrealized losses on fixed maturities as non-credit related and through its assessment of unrealized losses has determined that these securities will recover, allowing the Company to realize the anticipated long-term economic value. The Company currently does not intend to sell, nor does it expect to be required to sell these securities before recovery of their amortized cost. The Company employs a systematic methodology to evaluate declines in fair value below amortized cost for fixed maturity securities. In determining impairments, the Company evaluates several factors and circumstances, including the issuer’s overall financial condition; the issuer’s credit and financial strength ratings; the issuer’s financial performance, including earnings trends and asset quality; any specific events which may influence the operations of the issuer; the general outlook for market conditions in the industry or geographic region in which the issuer operates; and the degree to which the fair value of an issuer’s securities is below the Company’s amortized cost. The Company also considers any factors that might raise doubt about the issuer’s ability to make contractual payments as they come due and whether the Company expects to recover the entire amortized cost basis of the security.

C. Proceeds from sales

The proceeds from sales of available-for-sale fixed maturities and gross realized gains and gross realized losses on those sales were as follows:

	Three Months Ended March 31,
	2021		2020
(in millions)
Proceeds from sales	$	217.4	$	66.0
Gross gains		2.9		2.7
Gross losses		7.2		0.4

D. Impairments

For the three months ended March 31, 2021, the Company did not recognize any impairments. For the three months ended March 31, 2020, the Company recognized $28.5 million of impairment losses, consisting primarily of $22.2 million on fixed maturities and $4.8 million on mortgage loans. Impairments on fixed maturities included $16.0 million categorized as intend-to-sell and $6.2 million of credit-related losses.    

At March 31, 2021 and December 31, 2020, the allowance for credit losses on mortgage loans was $7.9 million.  At March 31, 2021, there was no allowance for credit losses on available-for-sale securities and at December 31, 2020, the allowance for credit losses on available-for-sale securities was $0.1 million.  

The methodology and significant inputs used to measure the amount of credit losses were as follows:

Fixed maturities, Corporate bonds – the Company utilized a financial model that derives expected cash flows based on probability-of-default factors by credit rating and asset duration, and loss-given-default factors based on security type. These factors are based on historical data provided by an independent third-party rating agency. In addition, other qualitative market data relevant to the realizability of contractual cash flows may be considered, including current conditions and reasonable and supportable forecasts.

Mortgage loans – the Company estimated losses by applying expected loss rates, which are based on historical data. Embedded in expected loss rates are mortgage risk ratings and risk factors associated with property type such as office, retail, lodging, multi-family and industrial. Risk ratings, based on property characteristics and metrics including the geographic market, are predominantly driven by estimates of loan-to-value and debt service coverage ratios. Ratings may be adjusted to reflect current conditions and to incorporate reasonable and supportable forecasts, such as volatility of cash flows and valuation.

E. Equity securities

Equity securities are carried at fair value and all increases or decreases in fair value are reported in net realized and unrealized investment gains (losses) on the Consolidated Statements of Income. The following table provides pre-tax net realized and unrealized gains (losses) on equity securities:

	Three Months Ended March 31,
(in millions)		2021		2020
Net gains (losses) recognized during the period	$	39.1	$	(136.2	)
Less: net gains (losses) recognized on equity securities sold    during the period		0.6		(0.6	)
Net unrealized gains (losses) recognized during the period on equity    securities still held	$	38.5	$	(135.6	)

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Fair Value

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value

4. Fair Value

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability, i.e., exit price, in an orderly transaction between market participants. The Company emphasizes the use of observable market data whenever available in determining fair value. Fair values presented for certain financial instruments are estimates which, in many cases, may differ significantly from the amounts that could be realized upon immediate liquidation. A hierarchy of the three broad levels of fair value is as follows, with the highest priority given to Level 1 as these are the most observable, and the lowest priority given to Level 3:

Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2 – Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data, including model-derived valuations.

Level 3 – Unobservable inputs that are supported by little or no market activity.

When more than one level of input is used to determine fair value, the financial instrument is classified as Level 2 or 3 according to the lowest level input that has a significant impact on the fair value measurement.

The following methods and assumptions were used to estimate the fair value of each class of financial instruments and have not changed since last year.

Fixed Maturities

Level 1 securities generally include U.S. Treasury issues and other securities that are highly liquid, and for which quoted market prices are available. Level 2 securities are valued using pricing for similar securities and pricing models that incorporate observable inputs including, but not limited to yield curves and issuer spreads. Level 3 securities include issues for which little observable data can be obtained, primarily due to the illiquid nature of the securities, and for which significant inputs used to determine fair value are based on the Company’s own assumptions.

The Company utilizes a third-party pricing service for the valuation of the majority of its fixed maturity securities and receives one quote per security. When quoted market prices in an active market are available, they are provided by the pricing service as the fair value and such values are classified as Level 1. Since fixed maturities other than U.S. Treasury securities generally do not trade on a daily basis, the pricing service prepares estimates of fair value for those securities using pricing techniques based on a market approach. Inputs into the fair value pricing common to all asset classes include: benchmark U.S. Treasury security yield curves; reported trades of identical or similar fixed maturity securities; broker/dealer quotes of identical or similar fixed maturity securities and structural characteristics such as maturity date, coupon, mandatory principal payment dates, frequency of interest and principal payments, and optional redemption features. Inputs into the fair value applications that are unique by asset class include, but are not limited to:

• U.S. government agencies – determination of direct versus indirect government support and whether any contingencies exist with respect to the timely payment of principal and interest.

• Foreign government – estimates of appropriate market spread versus underlying related sovereign treasury curve(s) dependent on liquidity and direct or contingent support.

• Municipals – overall credit quality, including assessments of the level and variability of: sources of payment such as income, sales or property taxes, levies or user fees; credit support such as insurance; state or local economic and political base; natural resource availability; and susceptibility to natural or man-made catastrophic events such as hurricanes, earthquakes or acts of terrorism.

• Corporate fixed maturities – overall credit quality, including assessments of the level and variability of: economic sensitivity; liquidity; corporate financial policies; management quality; regulatory environment; competitive position; ownership; restrictive covenants; and security or collateral.

• Residential mortgage-backed securities – estimates of prepayment speeds based upon: historical prepayment rate trends; underlying collateral interest rates; geographic concentration; vintage year; borrower credit quality characteristics; interest rate and yield curve forecasts; government or monetary authority support programs; tax policies; and delinquency/default trends.

• Commercial mortgage-backed securities – overall credit quality, including assessments of the value and supply/demand characteristics of: collateral type such as office, retail, residential, lodging, or other; geographic concentration by region, state, metropolitan statistical area and locale; vintage year; historical collateral performance including defeasance, delinquency, default and special servicer trends; and capital structure support features.

• Asset-backed securities – overall credit quality, including assessments of the underlying collateral type such as credit card receivables, automobile loan receivables and equipment lease receivables; geographic diversification; vintage year; historical collateral performance including delinquency, default and casualty trends; economic conditions influencing use rates and resale values; and contract structural support features.

Generally, all prices provided by the pricing service, except actively traded securities with quoted market prices, are reported as Level 2.

The Company holds privately placed fixed maturity securities and certain other fixed maturity securities that do not have an active market and for which the pricing service cannot provide fair values. The Company determines fair values for these securities using either matrix pricing utilizing the market approach or broker quotes. The Company will use observable market data as inputs into the fair value techniques, as discussed in the determination of Level 2 fair values, to the extent it is available, but is also required to use a certain amount of unobservable judgment due to the illiquid nature of the securities involved. Unobservable judgment reflected in the Company’s matrix model accounts for estimates of additional spread required by market participants for factors such as issue size, credit stress, structural complexity, high bond coupon or other unique features. These matrix-priced securities are reported as Level 2 or Level 3, depending on the significance of the impact of unobservable judgment on the security’s value. Additionally, the Company may obtain non-binding broker quotes which are reported as Level 3.

Equity Securities

Level 1 consists of publicly traded securities, including exchange traded funds, valued at quoted market prices. Level 2 includes securities that are valued using pricing for similar securities and pricing models that incorporate observable inputs. Level 3 consists of common or preferred stock of private companies for which observable inputs are not available.

The Company utilizes a third-party pricing service for the valuation of the majority of its equity securities and receives one quote for each equity security. When quoted market prices in an active market are available, they are provided by the pricing service as the fair value and such values are classified as Level 1. The Company holds certain equity securities that have been issued by privately-held entities that do not have an active market and for which the pricing service cannot provide fair values. Generally, the Company estimates fair value for these securities based on the issuer’s book value and market multiples and reports them as Level 3. Additionally, the Company may obtain non-binding broker quotes which are reported as Level 3.

Other Investments

Other investments primarily include mortgage participations and limited partnerships not subject to the equity method of accounting. The fair values of limited partnerships not subject to the equity method of accounting are based on the net asset value (“NAV”) provided by the general partner adjusted for recent financial information and are excluded from the fair value hierarchy.

The estimated fair values of the financial instruments were as follows:

	March 31, 2021				December 31, 2020
	Carrying		Fair		Carrying		Fair
(in millions)	Value		Value		Value		Value
Financial Assets carried at:
Fair Value through AOCI:
Fixed maturities	$	7,370.3	$	7,370.3	$	7,454.4	$	7,454.4
Fair Value through Net Income:
Equity securities		641.0		641.0		598.5		598.5
Other investments		176.9		176.9		176.8		176.8
Amortized Cost/Cost:
Other investments		459.7		489.9		470.3		504.8
Cash and cash equivalents		112.1		112.1		120.6		120.6
Total financial instruments	$	8,760.0	$	8,790.2	$	8,820.6	$	8,855.1
Financial Liabilities carried at:
Amortized Cost:
Debt	$	781.0	$	858.7	$	780.8	$	887.7

The Company has processes designed to ensure that the values received from its third-party pricing services are accurately recorded, that the data inputs and valuation approaches and techniques utilized are appropriate and consistently applied, and that the assumptions are reasonable and consistent with the objective of determining fair value. The Company reviews the pricing services’ policies describing its methodology, processes, practices and inputs, including various financial models used to value securities. For assets carried at fair value, the Company performs a review of the fair value hierarchy classifications and of prices received from its pricing service on a quarterly basis. Also, the Company reviews the portfolio pricing, including a process for which securities with changes in prices that exceed a defined threshold are verified to independent sources, if available. If upon review, the Company is not satisfied with the validity of a given price, a pricing challenge would be submitted to the pricing service along with supporting documentation for its review. The Company does not adjust quotes or prices obtained from the pricing service unless the pricing service agrees with the Company’s challenge. During the first three months of 2021 and 2020, the Company did not adjust any prices received from its pricing service.

Changes in the observability of valuation inputs may result in a reclassification of certain financial assets or liabilities within the fair value hierarchy. As previously discussed, the Company utilizes a third-party pricing service for the valuation of the majority of its fixed maturities and equity securities. The pricing service has indicated that it will only produce an estimate of fair value if there is objectively verifiable information to produce a valuation. If the pricing service discontinues pricing an investment, the Company will use observable market data to the extent it is available, but may also be required to make assumptions for market-based inputs that are unavailable due to market conditions.

The following tables provide, for each hierarchy level, the Company’s investment assets that were measured at fair value on a recurring basis.

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	359.7	$	155.3	$	204.4	$	—
Foreign government		2.6		—		2.6		—
Municipal		1,073.1		—		1,066.9		6.2
Corporate		4,115.2		—		4,114.8		0.4
Residential mortgage-backed		994.2		—		994.2		—
Commercial mortgage-backed		756.5		—		744.7		11.8
Asset-backed		69.0		—		69.0		—
Total fixed maturities		7,370.3		155.3		7,196.6		18.4
Equity securities		641.0		635.4		—		5.6
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,015.3	$	790.7	$	7,196.6	$	28.0

	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	392.0	$	155.8	$	236.2	$	—
Foreign government		2.7		—		2.7		—
Municipal		1,103.7		—		1,096.7		7.0
Corporate		4,111.3		—		4,110.8		0.5
Residential mortgage-backed		1,010.7		—		1,010.7		—
Commercial mortgage-backed		760.0		—		747.6		12.4
Asset-backed		74.0		—		74.0		—
Total fixed maturities		7,454.4		155.8		7,278.7		19.9
Equity securities		598.5		593.0		—		5.5
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,056.9	$	748.8	$	7,278.7	$	29.4

Limited partnerships measured at fair value using NAV based on an ownership interest in partners’ capital have not been included in the hierarchy tables. At March 31, 2021 and December 31, 2020, the fair values of these investments were $172.9 million and $172.8 million, respectively, approximately 2% of total investment assets.

The following tables provide, for each hierarchy level, the Company’s estimated fair values of financial instruments that were not carried at fair value:

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	112.1	$	112.1	$	—	$	—
Other investments		489.9		—		2.7		487.2
Total financial instruments	$	602.0	$	112.1	$	2.7	$	487.2
Liabilities:
Debt	$	858.7	$	—	$	858.7	$	—

	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	120.6	$	120.6	$	—	$	—
Other investments		504.8		—		2.7		502.1
Total financial instruments	$	625.4	$	120.6	$	2.7	$	502.1
Liabilities:
Debt	$	887.7	$	—	$	887.7	$	—

The tables below provide reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	Fixed Maturities
(in millions)	Municipal			Corporate			Commercial mortgage- backed			Total			Equity and Other		Total Assets
Three Months Ended March 31, 2021
Balance January 1, 2021	$	7.0		$	0.5		$	12.4		$	19.9		$	9.5	$	29.4
Total gains (losses):
Included in total net realized and      unrealized investment gains		—			—			—			—			0.1		0.1
Included in other comprehensive loss-net depreciation on available-for-sale securities		—			—			(0.4	)		(0.4	)		—		(0.4	)
Sales		(0.8	)		(0.1	)		(0.2	)		(1.1	)		—		(1.1	)
Balance March 31, 2021	$	6.2		$	0.4		$	11.8		$	18.4		$	9.6	$	28.0
Change in unrealized losses for the period    included in other comprehensive loss for    assets held at the end of the period	$	—		$	—		$	(0.4	)	$	(0.4	)	$	—	$	(0.4	)
Three Months Ended March 31, 2020
Balance January 1, 2020	$	12.1		$	0.6		$	12.7		$	25.4		$	5.6	$	31.0
Total  gains (losses):
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities		0.1			—			(0.4	)		(0.3	)		—		(0.3	)
Sales		(0.8	)		(0.1	)		(0.5	)		(1.4	)		—		(1.4	)
Balance March 31, 2020	$	11.4		$	0.5		$	11.8		$	23.7		$	5.6	$	29.3
Change in unrealized gains (losses) for the period    included in other comprehensive loss for    assets held at the end of the period	$	0.1		$	—		$	(0.4	)	$	(0.3	)	$	—	$	(0.3	)

There were no transfers between Level 2 and Level 3, and there were no Level 3 liabilities held by the Company for the three months ended March 31, 2021 and 2020.

The following table provides quantitative information about the significant unobservable inputs used by the Company in the fair value measurements of Level 3 assets. Where discounted cash flows were used in the valuation of fixed maturities, the internally-developed discount rate was adjusted by the significant unobservable inputs shown in the table.    

			March 31, 2021			December 31, 2020
	Valuation	Significant	Fair		Range	Fair		Range
(in millions)	Technique	Unobservable Inputs	Value		(Wtd Average)	Value		(Wtd Average)
Fixed maturities:
Municipal	Discounted cash flow	Discount for:    Small issue size    Credit stress	$	6.2	0.7 - 6.8% (5.0%) 0.2% (0.2%)	$	7.0	0.7 - 6.8% (5.0%) 0.2% (0.2%)
Corporate	Discounted cash flow	Discount for:    Small issue size    Above-market coupon	0.4		2.5% (2.5%) 0.3% (0.3%)	0.5		2.5% (2.5%) 0.3% (0.3%)
Commercial    mortgage-backed	Discounted cash flow	Discount for:    Small issue size    Above-market coupon    Lease structure    Credit stress	11.8		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) —	12.4		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) 0.2% (0.2%)
Equity securities	Market comparables	Net tangible asset    market multiples	1.2		1.0X (1.0X)		1.1	1.0X (1.0X)
	Internal price	Unadjusted price from    financing round	4.4		5.60 (5.60)		4.4	5.60 (5.60)
Other	Discounted cash flow	Discount rate	4.0		16.2% (16.2%)		4.0	16.2% (16.2%)

The weighted average of the unobservable inputs was weighted by the relative fair value of the fixed maturity securities to which the inputs were applied. Each unobservable input is based on the Company’s subjective opinion and therefore inherently contains a degree of uncertainty. Significant increases (decreases) in any of the above inputs in isolation would result in a significantly lower (higher) fair value measurement. There were no interrelationships between these inputs which might magnify or mitigate the effect of changes in unobservable inputs on the fair value measurement.

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

5. Income Taxes

Income tax expense for the three months ended March 31, 2021 and 2020 has been computed using estimated annual effective tax rates. These rates are revised, if necessary, at the end of each successive interim period to reflect current estimates of the annual effective tax rates.

The tax provision was comprised of a U.S. federal income tax expense of $21.3 million and a benefit of $15.2 million for the three months ended March 31, 2021 and 2020, respectively.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions, and have previously filed in foreign jurisdictions. The Company and its subsidiaries are subject to U.S. federal and state income tax examinations and foreign examinations for years after 2016.

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Pension Plans

3 Months Ended

Mar. 31, 2021

Compensation And Retirement Disclosure [Abstract]

Pension Plans

6. Pension Plans

The components of net periodic pension (benefit) cost for the defined benefit pension plans included in the Company’s results of operations are as follows:

	Three Months Ended March 31,
	2021			2020
(in millions)	Pension Plans
Interest cost	$	3.7		$	4.6
Expected return on plan assets		(4.6	)		(5.6	)
Recognized net actuarial loss		0.8			1.5
Net periodic pension (benefit) cost	$	(0.1	)	$	0.5

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Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Other Comprehensive Income (Loss)

7. Other Comprehensive Income (Loss)

The following tables provide changes in other comprehensive loss.

	Three Months Ended March 31,
	2021									2020
				Tax									Tax
				Benefit			Net of						Benefit			Net of
(in millions)	Pre-Tax			(Expense)			Tax			Pre-Tax			(Expense)			Tax
Changes in net unrealized gains (losses) on investment    securities:
Net unrealized losses arising during period for    those having no credit losses in Consolidated    Statement of Income	$	(234.1	)	$	49.2		$	(184.9	)	$	(100.3	)	$	20.9		$	(79.4	)
Net unrealized losses arising during period for    those having credit losses in Consolidated    Statement of Income		—			—			—			(22.1	)		4.7			(17.4	)
Amount of (gains) losses realized from sales and    other recognized in Consolidated Statement    of Income		1.6			(2.2	)		(0.6	)		(3.1	)		(1.2	)		(4.3	)
Amount of credit losses recognized in the    Consolidated Statement of Income		—			—			—			6.4			(1.4	)		5.0
Amount of additional impairment losses    recognized in the Consolidated Statement    of Income		—			—			—			16.3			(3.4	)		12.9
Net unrealized losses		(232.5	)		47.0			(185.5	)		(102.8	)		19.6			(83.2	)
Pension and postretirement benefits:
Amortization of net actuarial losses    recognized as net periodic benefit cost		0.8			(0.1	)		0.7			1.5			(0.3	)		1.2
Other comprehensive loss	$	(231.7	)	$	46.9		$	(184.8	)	$	(101.3	)	$	19.3		$	(82.0	)

Reclassifications out of accumulated other comprehensive income were as follows:

	Three Months Ended
	March 31,
(in millions)	2021			2020
	Amount Reclassified from
Details about Accumulated Other	Accumulated Other						Affected Line Item in the Statement
Comprehensive Income Components	Comprehensive Income						Where Net Income (Loss) is Presented
Net unrealized gains (losses) on investment    securities	$	(1.6	)	$	3.1		Net realized gains (losses) from sales and    other
		—			(22.2	)	Impairment losses on investments
		(1.6	)		(19.1	)	Total before tax
		2.2			5.9		Tax benefit
		0.6			(13.2	)	Continuing operations; net of tax
		—			(0.4	)	Discontinued operations - life businesses
		0.6			(13.6	)	Net of tax
Amortization of defined benefit pension    and postretirement actuarial losses		(0.8	)		(1.5	)	Loss adjustment expenses and other    operating expenses (1)
		0.1			0.3		Tax benefit
		(0.7	)		(1.2	)	Continuing operations; net of tax
Total reclassifications for the period	$	(0.1	)	$	(14.8	)	Expense reflected in income (loss),    net of tax

(1) The amount reclassified from accumulated other comprehensive income for the pension and postretirement benefits was allocated  approximately 40% to loss adjustment expenses and 60% to other operating expenses for the three months ended March 31, 2021 and 2020.

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Segment Information

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segment Information

8. Segment Information

The Company’s primary business operations include insurance products and services provided through three operating segments: Commercial Lines, Personal Lines and Other. Commercial Lines includes commercial multiple peril, commercial automobile, workers’ compensation, and other commercial coverages, such as management and professional liability, marine, Hanover Programs, specialty industrial and commercial property, monoline general liability and surety. Personal Lines includes personal automobile, homeowners and other personal coverages. Included in the Other segment are Opus Investment Management, Inc., which markets investment management services to institutions, pension funds and other organizations; earnings on holding company assets; holding company and other expenses, including certain costs associated with retirement benefits due to the Company’s former life insurance employees and agents; and a run-off voluntary property and casualty pools business. The separate financial information is presented consistent with the way results are regularly evaluated by the chief operating decision maker in deciding how to allocate resources and in assessing performance.

The Company reports interest expense related to debt separately from the earnings of its operating segments. This consists primarily of interest on the Company’s senior and subordinated debentures.

Management evaluates the results of the aforementioned segments based on operating income before income taxes, excluding interest expense on debt. Operating income before income taxes excludes certain items which are included in net income, such as net realized and unrealized investment gains and losses. Such gains and losses are excluded since they are determined by interest rates, financial markets and the timing of sales. Also, operating income before income taxes excludes net gains and losses on disposals of businesses, gains and losses related to the repayment of debt, discontinued operations, costs to acquire businesses, restructuring costs, the cumulative effect of accounting changes and certain other items. Although the items excluded from operating income before income taxes may be important components in understanding and assessing the Company’s overall financial performance, management believes that the presentation of operating income before income taxes enhances an investor’s understanding of the Company’s results of operations by highlighting net income attributable to the core operations of the business. However, operating income before income taxes should not be construed as a substitute for income before income taxes or income from continuing operations, and operating income should not be construed as a substitute for net income.

Summarized below is financial information with respect to the Company’s business segments.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Operating revenues:
Commercial Lines	$	748.3		$	724.7
Personal Lines		493.3			488.5
Other		4.2			4.6
Total		1,245.8			1,217.8
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Total revenues	$	1,283.3		$	1,056.2
Operating income (loss) before interest expense and income taxes:
Commercial Lines:
Underwriting income (loss)	$	(49.3	)	$	10.4
Net investment income		51.8			46.4
Other expense		(0.3	)		(2.2	)
Commercial Lines operating income		2.2			54.6
Personal Lines:
Underwriting income		58.9			44.1
Net investment income		22.1			20.3
Other income		0.8			0.5
Personal Lines operating income		81.8			64.9
Other:
Underwriting loss		(0.3	)		(3.3	)
Net investment income		2.9			2.9
Other expense		(1.5	)		(2.0	)
Other operating income (loss)		1.1			(2.4	)
Operating income before interest expense and income taxes		85.1			117.1
Interest on debt		(8.5	)		(9.4	)
Operating income before income taxes		76.6			107.7
Non-operating items:
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Income (loss) from continuing operations before income taxes	$	114.1		$	(53.9	)

The following table provides identifiable assets for the Company’s business segments and discontinued operations:

(in millions)	March 31, 2021		December 31, 2020
Property and Casualty Insurance Companies	$	13,348.4	$	13,333.5
Assets of discontinued businesses		99.6		110.2
Total	$	13,448.0	$	13,443.7

The Company reviews the assets of its Property and Casualty Insurance Companies collectively and does not allocate them between the Commercial Lines, Personal Lines and Other segments.

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Stock-based Compensation

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

9. Stock-based Compensation

As of March 31, 2021, there were 1,980,405 shares and 2,329,534 shares available for grant under The Hanover Insurance Group 2014 Long-Term Incentive Plan and The Hanover Insurance Group 2014 Employee Stock Purchase Plan, respectively.

Compensation cost for the Company’s stock-based awards and the related tax benefits were as follows:

	Three Months Ended March 31,
(in millions)	2021			2020
Stock-based compensation expense	$	5.6		$	5.0
Tax benefit		(1.2	)		(1.1	)
Stock-based compensation expense, net of taxes	$	4.4		$	3.9

Stock Options

Information on the Company’s stock option activity for the three months ended March 31, 2021 and 2020 is summarized below.

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of period		1,282,278		$	93.64		1,121,559		$	87.88
Granted		178,040			115.35		240,705			118.54
Exercised		(67,954	)		80.96		(35,918	)		79.40
Forfeited or cancelled		—			—		—			—
Outstanding, end of period		1,392,364			97.03		1,326,346			93.67

Restricted Stock Units

The Company currently issues time-based, market-based and performance-based restricted stock units to eligible employees, all of which generally vest after 3 years of continued employment.

The following tables summarize activity information about employee restricted stock units: 

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Time-based restricted stock units:
Outstanding, beginning of period		350,480		$	116.37		335,166		$	109.55
Granted		168,092			115.04		136,634			118.60
Vested		(109,667	)		110.68		(78,773	)		85.44
Forfeited		(7,388	)		116.82		(2,861	)		112.24
Outstanding, end of period		401,517			117.37		390,166			117.56
Performance-based and market-based restricted stock units:
Outstanding, beginning of period		97,043		$	119.59		86,252		$	110.70
Granted		62,143			114.66		54,415			105.10
Vested		(43,506	)		122.27		(36,499	)		80.26
Forfeited		—			—		—			—
Outstanding, end of period		115,680			115.93		104,168			118.45

In the first three months of 2021 and 2020, the Company granted market-based awards totaling 37,348 and 34,911, respectively, to certain members of senior management, which are included in the table above as performance and market-based restricted stock activity. The vesting of these stock units is based on the relative total shareholder return (“TSR”) of the Company. This metric is generally based on relative TSR for a three-year period as compared to a pre-selected group of property and casualty companies. The fair value of market-based awards was estimated at the date of grant using a valuation model. These units have the potential to range from 0% to 150% of the shares disclosed. Included in the amount granted above in 2021 and 2020 are 14,501 shares and 13,532 shares, respectively, related to market-based awards that achieved a payout in excess of 100%. These awards vested in the first quarters of 2021 and 2020, respectively.

The Company also granted performance-based restricted stock units in 2021 and 2020, totaling 21,401 and 19,504, respectively, which are based upon the Company’s achievement of return on equity objectives. These units have the potential to range from 0% to 150% of the shares disclosed, which varies based on grant year and individual participation level. Increases above the 100% target level are reflected as granted in the period in which performance-based stock unit goals are achieved. Decreases below the 100% target level are reflected as forfeited. There were no performance-based awards that vested in 2021 or 2020. 

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Earnings Per Share and Shareholders' Equity Transactions

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share and Shareholders' Equity Transactions

10. Earnings Per Share and Shareholders’ Equity Transactions

The following table provides weighted average share information used in the calculation of the Company’s basic and diluted earnings per share:

	Three Months Ended
	March 31,
(in millions, except per share data)	2021			2020
Basic shares used in the calculation of earnings per share		36.4			38.3
Dilutive effect of securities (1):
Employee stock options		0.3			—
Non-vested stock grants		0.2			—
Diluted shares used in the calculation of earnings per share		36.9			38.3
Per share effect of dilutive securities on income (loss) from    continuing operations	$	(0.03	)	$	—
Per share effect of dilutive securities on net income	$	(0.04	)	$	—

(1) Excludes 0.6 million shares due to antidilution that resulted from the Company having losses from continuing operations and net losses for the quarter ended March 31, 2020.

Diluted earnings per share for the three months ended March 31, 2021 and 2020 excludes 0.2 million and 0.4 million shares, respectively, issuable under the Company’s stock compensation plans because their effect would be antidilutive.

The Board of Directors has authorized a stock repurchase program which provides for aggregate repurchases of the Company’s common stock of up to $900 million, and under which the Company had approximately $78 million available at March 31, 2021. Under the repurchase authorization, the Company may repurchase, from time to time, common stock in amounts, at prices and at such times as the Company deems appropriate, subject to market conditions and other considerations. Repurchases may be executed using open market purchases, privately negotiated transactions, accelerated repurchase programs or other transactions. The Company is not required to purchase any specific number of shares or to make purchases by any certain date under this program. On October 29, 2020, pursuant to the terms of an accelerated share repurchase agreement (the “October 2020 ASR”) the Company paid $100.0 million and received an initial delivery of approximately 0.8 million shares of its common stock, which was approximately 80% of the total number of shares expected to be repurchased under the October 2020 ASR. On January 29, 2021, the Company received approximately 45,000 shares of its common stock shares as final settlement of shares repurchased under the October 2020 ASR.

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Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses

3 Months Ended

Mar. 31, 2021

Insurance [Abstract]

Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses

11. Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses

Reserve Rollforward and Prior Year Development

The Company regularly updates its reserve estimates as new information becomes available and further events occur which may impact the resolution of unsettled claims. Reserve adjustments are reflected in results of operations as adjustments to losses and loss adjustment expenses (“LAE”). Often these adjustments are recognized in periods subsequent to the period in which the underlying policy was written and loss event occurred. These types of subsequent adjustments are described as “prior years’ loss reserves.” Such development can be either favorable or unfavorable to the Company’s financial results and may vary by line of business. In this section, all amounts presented include catastrophe losses and LAE, unless otherwise indicated.

The table below provides a reconciliation of the gross beginning and ending reserve for unpaid losses and loss adjustment expenses.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Gross reserve for losses and LAE, beginning of period	$	6,024.0		$	5,654.4
Reinsurance recoverable on unpaid losses		1,641.6			1,574.8
Net reserve for losses and LAE, beginning of period		4,382.4			4,079.6
Net incurred losses and LAE in respect of losses occurring in:
Current year		789.5			730.2
Prior years		(8.2	)		(2.0	)
Total incurred losses and LAE		781.3			728.2
Net payments of losses and LAE in respect of losses occurring in:
Current year		178.5			174.6
Prior years		435.0			484.4
Total payments		613.5			659.0
Net reserve for losses and LAE, end of period		4,550.2			4,148.8
Reinsurance recoverable on unpaid losses		1,673.5			1,576.1
Gross reserve for losses and LAE, end of period	$	6,223.7		$	5,724.9

As a result of continuing trends in the Company’s business, reserves, including catastrophes, have been re-estimated for all prior accident years and were decreased by $8.2 million and $2.0 million in 2021 and 2020, respectively.

2021

For the three months ended March 31, 2021, net favorable loss and LAE development was $8.2 million. This was primarily due to lower than expected losses in the personal automobile line, driven by lower bodily injury and personal injury protection losses primarily in accident year 2020, and in the workers’ compensation line, primarily in accident years 2015 through 2017 and 2019.

2020

For the three months ended March 31, 2020, net favorable loss and LAE development was $2.0 million. Lower than expected losses in the workers’ compensation line, other commercial lines and homeowners line were partially offset by higher than expected losses in the commercial and personal automobile lines, commercial multiple peril line, and in the Company’s run-off voluntary assumed property and casualty reinsurance pools business. Within other commercial lines, lower than expected losses in the Company’s marine line and specialty industrial and commercial property lines were partially offset by higher than expected losses in the general liability lines. The higher than expected losses in the Company’s run-off voluntary assumed property and casualty reinsurance pools business was based on an updated third-party actuarial study received in the first quarter of 2020 for the Excess and Casualty Reinsurance Association (“ECRA”) pool that primarily consists of asbestos and environmental exposures.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. Commitments and Contingencies

Legal Proceedings

The Company has been named a defendant in various legal proceedings arising in the normal course of business. In addition, the Company is involved, from time to time, in examinations, investigations and proceedings by governmental and self-regulatory agencies. The potential outcome of any such action or regulatory proceedings in which the Company has been named a defendant or the subject of an inquiry or investigation, and its ultimate liability, if any, from such actions or regulatory proceedings, is difficult to predict at this time. The ultimate resolutions of such proceedings are not expected to have a material effect on its financial position, although they could have a material effect on the results of operations for a particular quarterly or annual period.

Residual Markets

The Company is required to participate in residual markets in various states, which generally pertain to high risk insureds, disrupted markets or lines of business or geographic areas where rates are regarded as excessive. The results of the residual markets are not subject to the predictability associated with the Company’s own managed business, and are significant to both the personal and commercial automobile lines of business.

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Subsequent Events

3 Months Ended

Mar. 31, 2021

Subsequent Events [Abstract]

Subsequent Events

13. Subsequent Events

There were no subsequent events requiring adjustment to the financial statements and no additional disclosure required in the notes to the consolidated financial statements.

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New Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Changes And Error Corrections [Abstract]

New Accounting Pronouncements

New Accounting Pronouncements

Recently Implemented Standards

In October 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Codification (“ASC”) Update No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables – Nonrefundable Fees and Other Costs. This guidance clarifies, for each reporting period, that an entity should reevaluate whether a callable debt security with multiple call dates is required to amortize any premium to the next call date. The updated guidance is effective for annual and interim periods beginning after December 15, 2020 and should be applied on a prospective basis as of the beginning of the period of adoption for existing or newly purchased callable debt securities. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.

In January 2020, the FASB issued ASC Update No. 2020-01, Investments – Equity Securities (Topic 321), Investments – Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815). This ASC update clarifies that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting when using the measurement alternative under ASC 321. This update also clarifies the accounting for certain forward contracts and purchased options accounted for under ASC 815. The updated guidance is effective for annual and interim periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.  

In December 2019, the FASB issued ASC Update No. 2019-12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes. This ASC update removes certain exceptions to the general principles in ASC 740, Income Taxes, including intraperiod tax allocation when there is a loss from continuing operations, foreign subsidiary treatment under certain conditions and for calculating interim income taxes when the year-to-date loss exceeds the anticipated loss. This update also clarifies and amends existing guidance related to changes in tax laws, business combinations and employee stock plans, among others. The updated guidance is effective for interim and annual periods beginning after December 15, 2020. The Company implemented this guidance effective January 1, 2021, and it did not have a material impact on its financial position or results of operations.   

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Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments Debt And Equity Securities [Abstract]

Schedule of Available-for-sale Fixed Maturities Reconciliation

The amortized cost and fair value of available-for-sale fixed maturities were as follows:

	March 31, 2021
					Amortized Cost,
			Allowance		Net of Allowance		Gross		Gross
	Amortized		for Credit		for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses		Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	360.7	$	—	$	360.7	$	11.1	$	12.1	$	359.7
Foreign government		2.2		—		2.2		0.4		—		2.6
Municipal		1,046.3		—		1,046.3		38.5		11.7		1,073.1
Corporate		3,908.6		—		3,908.6		227.5		20.9		4,115.2
Residential mortgage-backed		981.5		—		981.5		23.1		10.4		994.2
Commercial mortgage-backed		722.8		—		722.8		36.7		3.0		756.5
Asset-backed		67.0		—		67.0		2.0		—		69.0
Total fixed maturities	$	7,089.1	$	—	$	7,089.1	$	339.3	$	58.1	$	7,370.3

	December 31, 2020
						Amortized Cost,
			Allowance			Net of Allowance		Gross		Gross
	Amortized		for Credit			for Credit		Unrealized		Unrealized
(in millions)	Cost		Losses			Losses		Gains		Losses		Fair Value
U.S. Treasury and government agencies	$	376.4	$	—		$	376.4	$	17.6	$	2.0	$	392.0
Foreign government		2.2		—			2.2		0.5		—		2.7
Municipal		1,042.1		—			1,042.1		61.7		0.1		1,103.7
Corporate		3,770.0		(0.1	)		3,769.9		341.8		0.4		4,111.3
Residential mortgage-backed		978.2		—			978.2		33.1		0.6		1,010.7
Commercial mortgage-backed		705.4		—			705.4		54.8		0.2		760.0
Asset-backed		71.4		—			71.4		2.6		—		74.0
Total fixed maturities	$	6,945.7	$	(0.1	)	$	6,945.6	$	512.1	$	3.3	$	7,454.4

Investments Classified by Contractual Maturity Date

The amortized cost and fair value by maturity periods for fixed maturities are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, or the Company may have the right to put or sell the obligations back to the issuers.

	March 31, 2021
	Amortized Cost, Net
	of Allowance for		Fair
(in millions)	Credit Losses		Value
Due in one year or less	$	273.7	$	277.3
Due after one year through five years		1,820.5		1,945.4
Due after five years through ten years		2,461.1		2,575.1
Due after ten years		762.5		752.8
		5,317.8		5,550.6
Mortgage-backed and asset-backed securities		1,771.3		1,819.7
Total fixed maturities	$	7,089.1	$	7,370.3

Schedule of Unrealized Loss on Investments

The following tables provide information about the Company’s available-for-sale fixed maturity securities that were in an unrealized loss position at March 31, 2021 and December 31, 2020, including the length of time the securities have been in an unrealized loss position:

	March 31, 2021
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	12.1	$	171.5	$	—	$	—	$	12.1	$	171.5
Municipal		11.7		372.9		—		0.5		11.7		373.4
Corporate		19.5		515.1		—		—		19.5		515.1
Residential mortgage-backed		10.4		405.2		—		0.1		10.4		405.3
Commercial mortgage-backed		3.0		84.1		—		1.0		3.0		85.1
Asset-backed		—		4.6		—		—		—		4.6
Total investment grade		56.7		1,553.4		—		1.6		56.7		1,555.0
Below investment grade:
Corporate		1.4		64.6		—		—		1.4		64.6
Total fixed maturities	$	58.1	$	1,618.0	$	—	$	1.6	$	58.1	$	1,619.6

	December 31, 2020
	12 months or less				Greater than 12 months				Total
	Gross				Gross				Gross
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(in millions)	Losses		Value		Losses		Value		Losses		Value
Investment grade:
U.S. Treasury and government agencies	$	2.0	$	140.7	$	—	$	—	$	2.0	$	140.7
Municipal		0.1		19.3		—		0.7		0.1		20.0
Corporate		0.4		53.4		—		—		0.4		53.4
Residential mortgage-backed		0.6		94.4		—		—		0.6		94.4
Commercial mortgage-backed		0.2		33.2		—		—		0.2		33.2
Total investment grade		3.3		341.0		—		0.7		3.3		341.7
Below investment grade:
Corporate		—		4.6		—		—		—		4.6
Total fixed maturities	$	3.3	$	345.6	$	—	$	0.7	$	3.3	$	346.3

Schedule of Realized Gain (Loss)

The proceeds from sales of available-for-sale fixed maturities and gross realized gains and gross realized losses on those sales were as follows:

	Three Months Ended March 31,
	2021		2020
(in millions)
Proceeds from sales	$	217.4	$	66.0
Gross gains		2.9		2.7
Gross losses		7.2		0.4

Schedule of Pre-tax Net Realized and Unrealized Gains (Losses) on Equity Securities

The following table provides pre-tax net realized and unrealized gains (losses) on equity securities:

	Three Months Ended March 31,
(in millions)		2021		2020
Net gains (losses) recognized during the period	$	39.1	$	(136.2	)
Less: net gains (losses) recognized on equity securities sold    during the period		0.6		(0.6	)
Net unrealized gains (losses) recognized during the period on equity    securities still held	$	38.5	$	(135.6	)

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

The estimated fair values of the financial instruments were as follows:

	March 31, 2021				December 31, 2020
	Carrying		Fair		Carrying		Fair
(in millions)	Value		Value		Value		Value
Financial Assets carried at:
Fair Value through AOCI:
Fixed maturities	$	7,370.3	$	7,370.3	$	7,454.4	$	7,454.4
Fair Value through Net Income:
Equity securities		641.0		641.0		598.5		598.5
Other investments		176.9		176.9		176.8		176.8
Amortized Cost/Cost:
Other investments		459.7		489.9		470.3		504.8
Cash and cash equivalents		112.1		112.1		120.6		120.6
Total financial instruments	$	8,760.0	$	8,790.2	$	8,820.6	$	8,855.1
Financial Liabilities carried at:
Amortized Cost:
Debt	$	781.0	$	858.7	$	780.8	$	887.7

Fair Value, Investment Assets Measured on Recurring Basis

The following tables provide, for each hierarchy level, the Company’s investment assets that were measured at fair value on a recurring basis.

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	359.7	$	155.3	$	204.4	$	—
Foreign government		2.6		—		2.6		—
Municipal		1,073.1		—		1,066.9		6.2
Corporate		4,115.2		—		4,114.8		0.4
Residential mortgage-backed		994.2		—		994.2		—
Commercial mortgage-backed		756.5		—		744.7		11.8
Asset-backed		69.0		—		69.0		—
Total fixed maturities		7,370.3		155.3		7,196.6		18.4
Equity securities		641.0		635.4		—		5.6
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,015.3	$	790.7	$	7,196.6	$	28.0

	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Fixed maturities:
U.S. Treasury and government agencies	$	392.0	$	155.8	$	236.2	$	—
Foreign government		2.7		—		2.7		—
Municipal		1,103.7		—		1,096.7		7.0
Corporate		4,111.3		—		4,110.8		0.5
Residential mortgage-backed		1,010.7		—		1,010.7		—
Commercial mortgage-backed		760.0		—		747.6		12.4
Asset-backed		74.0		—		74.0		—
Total fixed maturities		7,454.4		155.8		7,278.7		19.9
Equity securities		598.5		593.0		—		5.5
Other investments		4.0		—		—		4.0
Total investment assets at fair value	$	8,056.9	$	748.8	$	7,278.7	$	29.4

Estimated Fair Values of Financial Instruments Not Carried at Fair Value

The following tables provide, for each hierarchy level, the Company’s estimated fair values of financial instruments that were not carried at fair value:

	March 31, 2021
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	112.1	$	112.1	$	—	$	—
Other investments		489.9		—		2.7		487.2
Total financial instruments	$	602.0	$	112.1	$	2.7	$	487.2
Liabilities:
Debt	$	858.7	$	—	$	858.7	$	—

	December 31, 2020
(in millions)	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	120.6	$	120.6	$	—	$	—
Other investments		504.8		—		2.7		502.1
Total financial instruments	$	625.4	$	120.6	$	2.7	$	502.1
Liabilities:
Debt	$	887.7	$	—	$	887.7	$	—

Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)

The tables below provide reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	Fixed Maturities
(in millions)	Municipal			Corporate			Commercial mortgage- backed			Total			Equity and Other		Total Assets
Three Months Ended March 31, 2021
Balance January 1, 2021	$	7.0		$	0.5		$	12.4		$	19.9		$	9.5	$	29.4
Total gains (losses):
Included in total net realized and      unrealized investment gains		—			—			—			—			0.1		0.1
Included in other comprehensive loss-net depreciation on available-for-sale securities		—			—			(0.4	)		(0.4	)		—		(0.4	)
Sales		(0.8	)		(0.1	)		(0.2	)		(1.1	)		—		(1.1	)
Balance March 31, 2021	$	6.2		$	0.4		$	11.8		$	18.4		$	9.6	$	28.0
Change in unrealized losses for the period    included in other comprehensive loss for    assets held at the end of the period	$	—		$	—		$	(0.4	)	$	(0.4	)	$	—	$	(0.4	)
Three Months Ended March 31, 2020
Balance January 1, 2020	$	12.1		$	0.6		$	12.7		$	25.4		$	5.6	$	31.0
Total  gains (losses):
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities		0.1			—			(0.4	)		(0.3	)		—		(0.3	)
Sales		(0.8	)		(0.1	)		(0.5	)		(1.4	)		—		(1.4	)
Balance March 31, 2020	$	11.4		$	0.5		$	11.8		$	23.7		$	5.6	$	29.3
Change in unrealized gains (losses) for the period    included in other comprehensive loss for    assets held at the end of the period	$	0.1		$	—		$	(0.4	)	$	(0.3	)	$	—	$	(0.3	)

Schedule of Additional Information About Significant Unobservable Inputs Used in Fair Valuations of Level 3

The following table provides quantitative information about the significant unobservable inputs used by the Company in the fair value measurements of Level 3 assets. Where discounted cash flows were used in the valuation of fixed maturities, the internally-developed discount rate was adjusted by the significant unobservable inputs shown in the table.    

			March 31, 2021			December 31, 2020
	Valuation	Significant	Fair		Range	Fair		Range
(in millions)	Technique	Unobservable Inputs	Value		(Wtd Average)	Value		(Wtd Average)
Fixed maturities:
Municipal	Discounted cash flow	Discount for:    Small issue size    Credit stress	$	6.2	0.7 - 6.8% (5.0%) 0.2% (0.2%)	$	7.0	0.7 - 6.8% (5.0%) 0.2% (0.2%)
Corporate	Discounted cash flow	Discount for:    Small issue size    Above-market coupon	0.4		2.5% (2.5%) 0.3% (0.3%)	0.5		2.5% (2.5%) 0.3% (0.3%)
Commercial    mortgage-backed	Discounted cash flow	Discount for:    Small issue size    Above-market coupon    Lease structure    Credit stress	11.8		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) —	12.4		1.9 - 3.1% (2.7%) 0.5% (0.5%) 0.3% (0.3%) 0.2% (0.2%)
Equity securities	Market comparables	Net tangible asset    market multiples	1.2		1.0X (1.0X)		1.1	1.0X (1.0X)
	Internal price	Unadjusted price from    financing round	4.4		5.60 (5.60)		4.4	5.60 (5.60)
Other	Discounted cash flow	Discount rate	4.0		16.2% (16.2%)		4.0	16.2% (16.2%)

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Pension Plans (Tables)

3 Months Ended

Mar. 31, 2021

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension (Benefit) Cost

The components of net periodic pension (benefit) cost for the defined benefit pension plans included in the Company’s results of operations are as follows:

	Three Months Ended March 31,
	2021			2020
(in millions)	Pension Plans
Interest cost	$	3.7		$	4.6
Expected return on plan assets		(4.6	)		(5.6	)
Recognized net actuarial loss		0.8			1.5
Net periodic pension (benefit) cost	$	(0.1	)	$	0.5

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Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Changes in Other Comprehensive Loss

The following tables provide changes in other comprehensive loss.

	Three Months Ended March 31,
	2021									2020
				Tax									Tax
				Benefit			Net of						Benefit			Net of
(in millions)	Pre-Tax			(Expense)			Tax			Pre-Tax			(Expense)			Tax
Changes in net unrealized gains (losses) on investment    securities:
Net unrealized losses arising during period for    those having no credit losses in Consolidated    Statement of Income	$	(234.1	)	$	49.2		$	(184.9	)	$	(100.3	)	$	20.9		$	(79.4	)
Net unrealized losses arising during period for    those having credit losses in Consolidated    Statement of Income		—			—			—			(22.1	)		4.7			(17.4	)
Amount of (gains) losses realized from sales and    other recognized in Consolidated Statement    of Income		1.6			(2.2	)		(0.6	)		(3.1	)		(1.2	)		(4.3	)
Amount of credit losses recognized in the    Consolidated Statement of Income		—			—			—			6.4			(1.4	)		5.0
Amount of additional impairment losses    recognized in the Consolidated Statement    of Income		—			—			—			16.3			(3.4	)		12.9
Net unrealized losses		(232.5	)		47.0			(185.5	)		(102.8	)		19.6			(83.2	)
Pension and postretirement benefits:
Amortization of net actuarial losses    recognized as net periodic benefit cost		0.8			(0.1	)		0.7			1.5			(0.3	)		1.2
Other comprehensive loss	$	(231.7	)	$	46.9		$	(184.8	)	$	(101.3	)	$	19.3		$	(82.0	)

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of accumulated other comprehensive income were as follows:

	Three Months Ended
	March 31,
(in millions)	2021			2020
	Amount Reclassified from
Details about Accumulated Other	Accumulated Other						Affected Line Item in the Statement
Comprehensive Income Components	Comprehensive Income						Where Net Income (Loss) is Presented
Net unrealized gains (losses) on investment    securities	$	(1.6	)	$	3.1		Net realized gains (losses) from sales and    other
		—			(22.2	)	Impairment losses on investments
		(1.6	)		(19.1	)	Total before tax
		2.2			5.9		Tax benefit
		0.6			(13.2	)	Continuing operations; net of tax
		—			(0.4	)	Discontinued operations - life businesses
		0.6			(13.6	)	Net of tax
Amortization of defined benefit pension    and postretirement actuarial losses		(0.8	)		(1.5	)	Loss adjustment expenses and other    operating expenses (1)
		0.1			0.3		Tax benefit
		(0.7	)		(1.2	)	Continuing operations; net of tax
Total reclassifications for the period	$	(0.1	)	$	(14.8	)	Expense reflected in income (loss),    net of tax

(1) The amount reclassified from accumulated other comprehensive income for the pension and postretirement benefits was allocated  approximately 40% to loss adjustment expenses and 60% to other operating expenses for the three months ended March 31, 2021 and 2020.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Financial Information with Respect to Business Segments

Summarized below is financial information with respect to the Company’s business segments.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Operating revenues:
Commercial Lines	$	748.3		$	724.7
Personal Lines		493.3			488.5
Other		4.2			4.6
Total		1,245.8			1,217.8
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Total revenues	$	1,283.3		$	1,056.2
Operating income (loss) before interest expense and income taxes:
Commercial Lines:
Underwriting income (loss)	$	(49.3	)	$	10.4
Net investment income		51.8			46.4
Other expense		(0.3	)		(2.2	)
Commercial Lines operating income		2.2			54.6
Personal Lines:
Underwriting income		58.9			44.1
Net investment income		22.1			20.3
Other income		0.8			0.5
Personal Lines operating income		81.8			64.9
Other:
Underwriting loss		(0.3	)		(3.3	)
Net investment income		2.9			2.9
Other expense		(1.5	)		(2.0	)
Other operating income (loss)		1.1			(2.4	)
Operating income before interest expense and income taxes		85.1			117.1
Interest on debt		(8.5	)		(9.4	)
Operating income before income taxes		76.6			107.7
Non-operating items:
Net realized and unrealized investment gains (losses)		37.5			(161.6	)
Income (loss) from continuing operations before income taxes	$	114.1		$	(53.9	)

Identifiable Assets by Business Segment

The following table provides identifiable assets for the Company’s business segments and discontinued operations:

(in millions)	March 31, 2021		December 31, 2020
Property and Casualty Insurance Companies	$	13,348.4	$	13,333.5
Assets of discontinued businesses		99.6		110.2
Total	$	13,448.0	$	13,443.7

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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Compensation Cost and Related Tax Benefits

Compensation cost for the Company’s stock-based awards and the related tax benefits were as follows:

	Three Months Ended March 31,
(in millions)	2021			2020
Stock-based compensation expense	$	5.6		$	5.0
Tax benefit		(1.2	)		(1.1	)
Stock-based compensation expense, net of taxes	$	4.4		$	3.9

Summary of Stock Option Activity

Information on the Company’s stock option activity for the three months ended March 31, 2021 and 2020 is summarized below.

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of period		1,282,278		$	93.64		1,121,559		$	87.88
Granted		178,040			115.35		240,705			118.54
Exercised		(67,954	)		80.96		(35,918	)		79.40
Forfeited or cancelled		—			—		—			—
Outstanding, end of period		1,392,364			97.03		1,326,346			93.67

Summary of Activity Information about Employee Restricted Stock Units

The following tables summarize activity information about employee restricted stock units:

	Three Months Ended March 31,
	2021					2020
(in whole shares and dollars)	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Time-based restricted stock units:
Outstanding, beginning of period		350,480		$	116.37		335,166		$	109.55
Granted		168,092			115.04		136,634			118.60
Vested		(109,667	)		110.68		(78,773	)		85.44
Forfeited		(7,388	)		116.82		(2,861	)		112.24
Outstanding, end of period		401,517			117.37		390,166			117.56
Performance-based and market-based restricted stock units:
Outstanding, beginning of period		97,043		$	119.59		86,252		$	110.70
Granted		62,143			114.66		54,415			105.10
Vested		(43,506	)		122.27		(36,499	)		80.26
Forfeited		—			—		—			—
Outstanding, end of period		115,680			115.93		104,168			118.45

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Earnings Per Share and Shareholders' Equity Transactions (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Information Regarding Basic and Diluted Earnings Per Share

The following table provides weighted average share information used in the calculation of the Company’s basic and diluted earnings per share:

	Three Months Ended
	March 31,
(in millions, except per share data)	2021			2020
Basic shares used in the calculation of earnings per share		36.4			38.3
Dilutive effect of securities (1):
Employee stock options		0.3			—
Non-vested stock grants		0.2			—
Diluted shares used in the calculation of earnings per share		36.9			38.3
Per share effect of dilutive securities on income (loss) from    continuing operations	$	(0.03	)	$	—
Per share effect of dilutive securities on net income	$	(0.04	)	$	—

(1) Excludes 0.6 million shares due to antidilution that resulted from the Company having losses from continuing operations and net losses for the quarter ended March 31, 2020.

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Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses (Tables)

3 Months Ended

Mar. 31, 2021

Insurance [Abstract]

Schedule of Liability for Unpaid Losses and Loss Adjustment Expenses

The table below provides a reconciliation of the gross beginning and ending reserve for unpaid losses and loss adjustment expenses.

	Three Months Ended
	March 31,
(in millions)	2021			2020
Gross reserve for losses and LAE, beginning of period	$	6,024.0		$	5,654.4
Reinsurance recoverable on unpaid losses		1,641.6			1,574.8
Net reserve for losses and LAE, beginning of period		4,382.4			4,079.6
Net incurred losses and LAE in respect of losses occurring in:
Current year		789.5			730.2
Prior years		(8.2	)		(2.0	)
Total incurred losses and LAE		781.3			728.2
Net payments of losses and LAE in respect of losses occurring in:
Current year		178.5			174.6
Prior years		435.0			484.4
Total payments		613.5			659.0
Net reserve for losses and LAE, end of period		4,550.2			4,148.8
Reinsurance recoverable on unpaid losses		1,673.5			1,576.1
Gross reserve for losses and LAE, end of period	$	6,223.7		$	5,724.9

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New Accounting Pronouncements (Narrative) (Details)	Mar. 31, 2021
Accounting Standards Update 2020-08 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true
Accounting Standards Update 2020-01 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect	true
Change in accounting principle, accounting standards update, early adoption	true
Accounting Standards Update 2019-12 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect	true
Change in accounting principle, accounting standards update, early adoption	true

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Investments (Schedule of Available-for-sale Fixed Maturities Reconciliation) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 7,089,100,000	$ 6,945,600,000
Amortized Cost, Net of Allowance for Credit Losses	7,089,100,000
Fair Value	7,370,300,000	7,454,400,000
U.S. Treasury and Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	360,700,000	376,400,000
Amortized Cost, Net of Allowance for Credit Losses	360,700,000	376,400,000
Gross Unrealized Gains	11,100,000	17,600,000
Gross Unrealized Loss	12,100,000	2,000,000.0
Fair Value	359,700,000	392,000,000.0
Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,200,000	2,200,000
Amortized Cost, Net of Allowance for Credit Losses	2,200,000	2,200,000
Gross Unrealized Gains	400,000	500,000
Fair Value	2,600,000	2,700,000
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,046,300,000	1,042,100,000
Amortized Cost, Net of Allowance for Credit Losses	1,046,300,000	1,042,100,000
Gross Unrealized Gains	38,500,000	61,700,000
Gross Unrealized Loss	11,700,000	100,000
Fair Value	1,073,100,000	1,103,700,000
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,908,600,000	3,770,000,000.0
Allowance for Credit Losses		(100,000)
Amortized Cost, Net of Allowance for Credit Losses	3,908,600,000	3,769,900,000
Gross Unrealized Gains	227,500,000	341,800,000
Gross Unrealized Loss	20,900,000	400,000
Fair Value	4,115,200,000	4,111,300,000
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	981,500,000	978,200,000
Amortized Cost, Net of Allowance for Credit Losses	981,500,000	978,200,000
Gross Unrealized Gains	23,100,000	33,100,000
Gross Unrealized Loss	10,400,000	600,000
Fair Value	994,200,000	1,010,700,000
Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	722,800,000	705,400,000
Amortized Cost, Net of Allowance for Credit Losses	722,800,000	705,400,000
Gross Unrealized Gains	36,700,000	54,800,000
Gross Unrealized Loss	3,000,000.0	200,000
Fair Value	756,500,000	760,000,000.0
Asset-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	67,000,000.0	71,400,000
Amortized Cost, Net of Allowance for Credit Losses	67,000,000.0	71,400,000
Gross Unrealized Gains	2,000,000.0	2,600,000
Fair Value	69,000,000.0	74,000,000.0
Fixed Maturities Including Held For Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,089,100,000	6,945,700,000
Allowance for Credit Losses	0	(100,000)
Amortized Cost, Net of Allowance for Credit Losses	7,089,100,000	6,945,600,000
Gross Unrealized Gains	339,300,000	512,100,000
Gross Unrealized Loss	58,100,000	3,300,000
Fair Value	$ 7,370,300,000	$ 7,454,400,000

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Investments (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities [Abstract]
Due in one year or less, Amortized Cost, Net of Allowance for Credit Losses	$ 273.7
Due after one year through five years, Amortized Cost, Net of Allowance for Credit Losses	1,820.5
Due after five years through ten years, Amortized Cost, Net of Allowance for Credit Losses	2,461.1
Due after ten years, Amortized Cost, Net of Allowance for Credit Losses	762.5
Gross fixed maturities, Amortized Cost, Net of Allowance for Credit Losses	5,317.8
Mortgage-backed and asset-backed securities, Amortized Cost, Net of Allowance for Credit Losses	1,771.3
Amortized Cost, Net of Allowance for Credit Losses	7,089.1
Due in one year or less, Fair Value	277.3
Due after one year through five years, Fair Value	1,945.4
Due after five years through ten years, Fair Value	2,575.1
Due after ten years, Fair Value	752.8
Gross fixed maturities, Fair Value	5,550.6
Mortgage-backed and asset-backed securities, Fair Value	1,819.7
Fixed maturities, Fair Value	$ 7,370.3	$ 7,454.4

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Investments (Schedule of Unrealized Loss on Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	$ 58.1	$ 3.3
12 months or less, Fair Value	1,618.0	345.6
Greater than 12 months, Fair Value	1.6	0.7
Total, Gross Unrealized Losses	58.1	3.3
Total, Fair Value	1,619.6	346.3
Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	56.7	3.3
12 months or less, Fair Value	1,553.4	341.0
Greater than 12 months, Fair Value	1.6	0.7
Total, Gross Unrealized Losses	56.7	3.3
Total, Fair Value	1,555.0	341.7
U.S. Treasury and Government Agencies [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	12.1	2.0
12 months or less, Fair Value	171.5	140.7
Total, Gross Unrealized Losses	12.1	2.0
Total, Fair Value	171.5	140.7
Municipal [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	11.7	0.1
12 months or less, Fair Value	372.9	19.3
Greater than 12 months, Fair Value	0.5	0.7
Total, Gross Unrealized Losses	11.7	0.1
Total, Fair Value	373.4	20.0
Corporate [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	19.5	0.4
12 months or less, Fair Value	515.1	53.4
Total, Gross Unrealized Losses	19.5	0.4
Total, Fair Value	515.1	53.4
Corporate [Member] | Below Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	1.4
12 months or less, Fair Value	64.6	4.6
Total, Gross Unrealized Losses	1.4
Total, Fair Value	64.6	4.6
Residential Mortgage-Backed [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	10.4	0.6
12 months or less, Fair Value	405.2	94.4
Greater than 12 months, Fair Value	0.1
Total, Gross Unrealized Losses	10.4	0.6
Total, Fair Value	405.3	94.4
Commercial Mortgage-Backed [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Gross Unrealized Losses	3.0	0.2
12 months or less, Fair Value	84.1	33.2
Greater than 12 months, Fair Value	1.0
Total, Gross Unrealized Losses	3.0	0.2
Total, Fair Value	85.1	$ 33.2
Asset-backed [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or less, Fair Value	4.6
Total, Fair Value	$ 4.6

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Investments (Schedule of Realized Gain (Loss)) (Details) - Fixed Maturities Including Held For Sale [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Investments [Line Items]
Proceeds from sales	$ 217.4	$ 66.0
Gross gains	2.9	2.7
Gross losses	$ 7.2	$ 0.4

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Investments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Impairment losses on investments	$ 0	$ 28,500,000
Impairments on fixed maturities included intend to sell		16,000,000.0
Impairments on fixed maturities credit related losses		6,200,000
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Impairment losses on investments		22,200,000
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Impairment losses on investments		$ 4,800,000
Allowance for credit losses	7,900,000		$ 7,900,000
Fixed Maturities Including Held For Sale [Member]
Schedule of Investments [Line Items]
Allowance for credit losses	$ 0		$ 100,000

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Investments (Schedule of Pre-tax Net Realized and Unrealized Gains (Losses) on Equity Securities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]
Net gains (losses) recognized during the period	$ 39.1	$ (136.2)
Less: net gains (losses) recognized on equity securities sold during the period	0.6	(0.6)
Net unrealized gains (losses) recognized during the period on equity securities still held	$ 38.5	$ (135.6)

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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 112.1	$ 120.6
Total financial instruments	8,760.0	8,820.6
Carrying Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through AOCI [Member] | Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	7,370.3	7,454.4
Carrying Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through Net Income [Member] | Other Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	176.9	176.8
Carrying Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through Net Income [Member] | Equity Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	641.0	598.5
Carrying Value [Member] | Cost Approach Valuation Technique [Member] | Amortized Cost/Cost [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Debt	781.0	780.8
Carrying Value [Member] | Cost Approach Valuation Technique [Member] | Amortized Cost/Cost [Member] | Other Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	459.7	470.3
Estimated Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Total financial instruments	8,790.2	8,855.1
Debt	858.7	887.7
Estimated Fair Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through AOCI [Member] | Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	7,370.3	7,454.4
Estimated Fair Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through Net Income [Member] | Other Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	176.9	176.8
Estimated Fair Value [Member] | Income Approach Valuation Technique [Member] | Fair Value Through Net Income [Member] | Equity Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	641.0	598.5
Estimated Fair Value [Member] | Cost Approach Valuation Technique [Member] | Amortized Cost/Cost [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Debt	858.7	887.7
Estimated Fair Value [Member] | Cost Approach Valuation Technique [Member] | Amortized Cost/Cost [Member] | Other Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value of investments	$ 489.9	$ 504.8

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Fair Value (Fair Value, Investment Assets Measured on Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	$ 7,370.3	$ 7,454.4
Equity securities	641.0	598.5
Other investments	793.2	793.2
U.S. Treasury and Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	359.7	392.0
Foreign Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	2.6	2.7
Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	1,073.1	1,103.7
Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	4,115.2	4,111.3
Residential Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	994.2	1,010.7
Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	756.5	760.0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1.2	1.1
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	7,370.3	7,454.4
Equity securities	641.0	598.5
Other investments	4.0	4.0
Total investment assets at fair value, excluding held-for-sale	8,015.3	8,056.9
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	359.7	392.0
Fair Value, Measurements, Recurring [Member] | Foreign Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	2.6	2.7
Fair Value, Measurements, Recurring [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	1,073.1	1,103.7
Fair Value, Measurements, Recurring [Member] | Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	4,115.2	4,111.3
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	994.2	1,010.7
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	756.5	760.0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	69.0	74.0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	155.3	155.8
Equity securities	635.4	593.0
Total investment assets at fair value, excluding held-for-sale	790.7	748.8
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury and Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	155.3	155.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	7,196.6	7,278.7
Total investment assets at fair value, excluding held-for-sale	7,196.6	7,278.7
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury and Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	204.4	236.2
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	2.6	2.7
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	1,066.9	1,096.7
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	4,114.8	4,110.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	994.2	1,010.7
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	744.7	747.6
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	69.0	74.0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	18.4	19.9
Equity securities	5.6	5.5
Other investments	4.0	4.0
Total investment assets at fair value, excluding held-for-sale	28.0	29.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	6.2	7.0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	0.4	0.5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	$ 11.8	$ 12.4

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Fair Value (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value Measurements [Line Items]
Investments measured at net asset value based on an ownership interest in partners'	2.00%		2.00%
Transfer between Level 2 and Level 3	$ 0	$ 0
Fair Value Measured Using NAV [Member] | Limited Partnerships Interest [Member]
Fair Value Measurements [Line Items]
Investments measured at fair value using net asset value	172,900,000		$ 172,800,000
Level 3 [Member]
Fair Value Measurements [Line Items]
Investments measured at fair value using net asset value	4,000,000.0		$ 4,000,000.0
Liabilities held	$ 0	$ 0

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Fair Value (Estimated Fair Values of Financial Instruments Not Carried at Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other investments	$ 4.0	$ 4.0
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Estimated Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Other investments	489.9	504.8
Total financial instruments	602.0	625.4
Debt	858.7	887.7
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	112.1	120.6
Total financial instruments	112.1	120.6
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other investments	2.7	2.7
Total financial instruments	2.7	2.7
Debt	858.7	887.7
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other investments	487.2	502.1
Total financial instruments	$ 487.2	$ 502.1

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Fair Value (Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	$ 29.4	$ 31.0
Included in total net realized and unrealized investment gains (losses)	0.1
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities	(0.4)	(0.3)
Purchases and Sales:
Sales	(1.1)	(1.4)
Ending Balance	28.0	29.3
Change in unrealized gains (losses) for the period included in other comprehensive loss for assets held at the end of the period	(0.4)	(0.3)
Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	7.0	12.1
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities		0.1
Purchases and Sales:
Sales	(0.8)	(0.8)
Ending Balance	6.2	11.4
Change in unrealized gains (losses) for the period included in other comprehensive loss for assets held at the end of the period		0.1
Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	0.5	0.6
Purchases and Sales:
Sales	(0.1)	(0.1)
Ending Balance	0.4	0.5
Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	12.4	12.7
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities	(0.4)	(0.4)
Purchases and Sales:
Sales	(0.2)	(0.5)
Ending Balance	11.8	11.8
Change in unrealized gains (losses) for the period included in other comprehensive loss for assets held at the end of the period	(0.4)	(0.4)
Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	19.9	25.4
Included in other comprehensive loss-net appreciation (depreciation) on available-for-sale securities	(0.4)	(0.3)
Purchases and Sales:
Sales	(1.1)	(1.4)
Ending Balance	18.4	23.7
Change in unrealized gains (losses) for the period included in other comprehensive loss for assets held at the end of the period	(0.4)	(0.3)
Equity Securities and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	9.5	5.6
Included in total net realized and unrealized investment gains (losses)	0.1
Purchases and Sales:
Ending Balance	$ 9.6	$ 5.6

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Fair Value (Schedule of Additional Information About Significant Unobservable Inputs Used in Fair Valuations of Level 3) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value [Line Items]
Fair Value	$ 7,370.3	$ 7,454.4
Equity securities, at fair value	641.0	598.5
Level 3 [Member]
Fair Value [Line Items]
Equity securities, at fair value	$ 1.2	$ 1.1
Equity Securities, FV-NI, Valuation Technique [Extensible List]	Market Comparables [Member]	Market Comparables [Member]
Equity Securities, FV-NI, Measurement Input [Extensible List]	thg:MeasurementInputNetTangibleAssetMarketMultipleMember	thg:MeasurementInputNetTangibleAssetMarketMultipleMember
Fair Value	$ 4.0	$ 4.0
Alternative Investment, Valuation Technique [Extensible List]	Discounted cash flow [Member]	Discounted cash flow [Member]
Alternative Investment, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember
Discounted cash flow [Member] | Level 3 [Member]
Fair Value [Line Items]
Range	0.162	0.162
Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member]
Fair Value [Line Items]
Range	0.162	0.162
Municipal [Member]
Fair Value [Line Items]
Fair Value	$ 1,073.1	$ 1,103.7
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member]
Fair Value [Line Items]
Fair Value	$ 6.2	$ 7.0
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input Discount For Credit Stress [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.20%	0.20%
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member] | Minimum [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.70%	0.70%
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member] | Maximum [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	6.80%	6.80%
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	5.00%	5.00%
Municipal [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input Discount For Credit Stress [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.20%	0.20%
Corporate [Member]
Fair Value [Line Items]
Fair Value	$ 4,115.2	$ 4,111.3
Corporate [Member] | Discounted cash flow [Member] | Level 3 [Member]
Fair Value [Line Items]
Fair Value	$ 0.4	$ 0.5
Corporate [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	2.50%	2.50%
Corporate [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input, Discount For Above-market coupon [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.30%	0.30%
Corporate [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	2.50%	2.50%
Corporate [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount For Above-market coupon [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.30%	0.30%
Commercial Mortgage-Backed [Member]
Fair Value [Line Items]
Fair Value	$ 756.5	$ 760.0
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member]
Fair Value [Line Items]
Fair Value	$ 11.8	$ 12.4
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input Discount For Credit Stress [Member]
Fair Value [Line Items]
Significant Unobservable Inputs		0.20%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input, Discount For Above-market coupon [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.50%	0.50%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Measurement Input, Discount For Lease Structure [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.30%	0.30%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Minimum [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	1.90%	1.90%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Maximum [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	3.10%	3.10%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount for Small Issue Size [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	2.70%	2.70%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input Discount For Credit Stress [Member]
Fair Value [Line Items]
Significant Unobservable Inputs		0.20%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount For Above-market coupon [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.50%	0.50%
Commercial Mortgage-Backed [Member] | Discounted cash flow [Member] | Level 3 [Member] | Weighted Average [Member] | Measurement Input, Discount For Lease Structure [Member]
Fair Value [Line Items]
Significant Unobservable Inputs	0.30%	0.30%
Equity Securities [Member] | Internal Price [Member] | Level 3 [Member]
Fair Value [Line Items]
Equity securities, at fair value	$ 4.4	$ 4.4
Fair value measurement market multiples	5.60	5.60
Equity Securities [Member] | Internal Price [Member] | Level 3 [Member] | Weighted Average [Member]
Fair Value [Line Items]
Fair value measurement market multiples	5.60	5.60
Equity Securities [Member] | Market Comparables [Member] | Level 3 [Member]
Fair Value [Line Items]
Fair value measurement market multiples	1.0	1.0
Equity Securities [Member] | Market Comparables [Member] | Level 3 [Member] | Weighted Average [Member]
Fair Value [Line Items]
Fair value measurement market multiples	1.0	1.0

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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Federal income tax expense (benefit)	$ 21.3	$ (15.2)

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Pension Plans (Components of Net Periodic Pension (Benefit) Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Interest cost	$ 3.7	$ 4.6
Expected return on plan assets	(4.6)	(5.6)
Recognized net actuarial loss	0.8	1.5
Net periodic pension (benefit) cost	$ (0.1)	$ 0.5

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Other Comprehensive Income (Loss) (Changes in Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Net unrealized losses arising during period for those having no credit losses in Consolidated Statement of Income, Pre-Tax	$ (234.1)	$ (100.3)
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statement of Income, Pre-Tax		(22.1)
Amount of (gains) losses realized from sales and other recognized in Consolidated Statement of Income, Pre-Tax	1.6	(3.1)
Amount of credit losses recognized in the Consolidated Statement of Income, Pre-Tax		6.4
Amount of additional impairment losses recognized in the Consolidated Statement of Income, Pre-Tax		16.3
Net unrealized losses, Pre-Tax	(232.5)	(102.8)
Amortization of net actuarial losses recognized as net periodic benefit cost, Pre-Tax	0.8	1.5
Other comprehensive loss, Pre-Tax	(231.7)	(101.3)
Net unrealized losses arising during period for those having no credit losses in Consolidated Statement of Income, Tax Benefit (Expense)	49.2	20.9
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statement of Income, Tax Benefit (Expense)		4.7
Amount of (gains) losses realized from sales and other recognized in Consolidated Statement of Income, Tax Benefit (Expense)	(2.2)	(1.2)
Amount of credit losses recognized in the Consolidated Statement of Income, Tax Benefit (Expense)		(1.4)
Amount of additional impairment losses recognized in the Consolidated Statement of Income, Tax Benefit (Expense)		(3.4)
Net unrealized losses, Tax Benefit (Expense)	47.0	19.6
Amortization of net actuarial losses recognized as net periodic benefit cost, Tax Benefit (Expense)	(0.1)	(0.3)
Other comprehensive loss, Tax Benefit (Expense)	46.9	19.3
Net unrealized losses arising during period for those having no credit losses in Consolidated Statement of Income, Net of Tax	(184.9)	(79.4)
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statement of Income, Net of Tax		(17.4)
Amount of (gains) losses realized from sales and other recognized in Consolidated Statement of Income, Net of Tax	(0.6)	(4.3)
Amount of credit losses recognized in the Consolidated Statement of Income, Net of Tax		5.0
Amount of additional impairment losses recognized in the Consolidated Statement of Income, Net of Tax		12.9
Total available-for-sale securities	(185.5)	(83.2)
Amortization of net actuarial losses recognized as net periodic benefit cost, Net of Tax	0.7	1.2
Total other comprehensive loss, net of tax	$ (184.8)	$ (82.0)

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Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) from sales and other	$ (1.6)	$ 3.1
Income (loss) from continuing operations before income taxes	114.1	(53.9)
Loss adjustment expenses and other operating expenses	(781.3)	(728.2)
Tax benefit	(21.3)	15.2
Income (loss) from continuing operations	92.8	(38.7)
Net income (loss)	92.7	(40.0)
Life [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Discontinued operations - life businesses	(0.1)	(1.3)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(0.1)	(14.8)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension and Postretirement Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss adjustment expenses and other operating expenses	(0.8)	(1.5)
Tax benefit	0.1	0.3
Income (loss) from continuing operations	(0.7)	(1.2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Appreciation (Depreciation) on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) from sales and other	(1.6)	3.1
Impairment losses on investments		(22.2)
Income (loss) from continuing operations before income taxes	(1.6)	(19.1)
Tax benefit	2.2	5.9
Income (loss) from continuing operations	0.6	(13.2)
Net income (loss)	$ 0.6	(13.6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Appreciation (Depreciation) on Investments [Member] | Life [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Discontinued operations - life businesses		$ (0.4)

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Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income) (Parenthetical) (Details) - Defined Benefit Pension and Postretirement Plans [Member]	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Comprehensive Income (Loss) [Line Items]
Loss adjustment expenses	40.00%	40.00%
Percentage of other operating expenses	60.00%	60.00%

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Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021 segment
Segment Reporting [Abstract]
Operating segments	3

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Segment Information (Financial Information with Respect to Business Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 1,245.8	$ 1,217.8
Net realized and unrealized investment gains (losses)	37.5	(161.6)
Total revenues	1,283.3	1,056.2
Net investment income	76.8	69.6
Operating income (loss) before interest expense and income taxes	85.1	117.1
Interest on debt	(8.5)	(9.4)
Operating income before income taxes	76.6	107.7
Income (loss) from continuing operations before income taxes	114.1	(53.9)
Commercial Lines [Member]
Segment Reporting Information [Line Items]
Operating revenues	748.3	724.7
Underwriting income (loss)	(49.3)	10.4
Net investment income	51.8	46.4
Other income (expense)	(0.3)	(2.2)
Operating income (loss) before interest expense and income taxes	2.2	54.6
Personal Lines [Member]
Segment Reporting Information [Line Items]
Operating revenues	493.3	488.5
Underwriting income (loss)	58.9	44.1
Net investment income	22.1	20.3
Other income (expense)	0.8	0.5
Operating income (loss) before interest expense and income taxes	81.8	64.9
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	4.2	4.6
Underwriting income (loss)	(0.3)	(3.3)
Net investment income	2.9	2.9
Other income (expense)	(1.5)	(2.0)
Operating income (loss) before interest expense and income taxes	$ 1.1	$ (2.4)

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Segment Information (Identifiable Assets by Business Segment) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Identifiable assets	$ 13,448.0	$ 13,443.7
Identifiable assets	99.6	110.2
Property and Casualty Insurance Companies [Member]
Segment Reporting Information [Line Items]
Identifiable assets	13,348.4	13,333.5
Assets of Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 99.6	$ 110.2

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Stock-based Compensation (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Time-based, Market-based and Performance-based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Market-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Granted, Shares	37,348	34,911
Increase as grant in period, percentage	100.00%
Market-Based Restricted Stock Units [Member] | 2021 Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Shares	14,501
Market-Based Restricted Stock Units [Member] | 2020 Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Shares		13,532
Performance-Based and Market-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Shares	62,143	54,415
Vested, Shares	43,506	36,499
Performance-Based and Market-Based Restricted Stock Units [Member] | Minimum [Member] | Senior Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance metric, potential range	0.00%
Performance-Based and Market-Based Restricted Stock Units [Member] | Maximum [Member] | Senior Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance metric, potential range	150.00%
Performance-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Shares	21,401	19,504
Vested, Shares	0	0
Performance-Based Restricted Stock Units [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance metric, potential range	0.00%
Performance-Based Restricted Stock Units [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance metric, potential range	150.00%
2014 Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant	1,980,405
ESPP Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant	2,329,534

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Stock-based Compensation (Compensation Cost and Related Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based compensation expense	$ 5.6	$ 5.0
Tax benefit	(1.2)	(1.1)
Stock-based compensation expense, net of taxes	$ 4.4	$ 3.9

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Stock-based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shares
Outstanding, beginning of period, Shares	1,282,278	1,121,559
Granted, Shares	178,040	240,705
Exercised, Shares	(67,954)	(35,918)
Outstanding, end of period, Shares	1,392,364	1,326,346
Weighted Average Exercise Price
Outstanding, beginning of period, Weighted Average Exercise Price	$ 93.64	$ 87.88
Granted, Weighted Average Exercise Price	115.35	118.54
Exercised, Weighted Average Exercise Price	80.96	79.40
Outstanding, end of period, Weighted Average Exercise Price	$ 97.03	$ 93.67

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Stock-based Compensation (Summary of Activity Information about Employee Restricted Stock Units) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Time-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, beginning of period, Shares	350,480	335,166
Granted, Shares	168,092	136,634
Vested, Shares	(109,667)	(78,773)
Forfeited, Shares	(7,388)	(2,861)
Outstanding, end of period, Shares	401,517	390,166
Outstanding, beginning of period, Weighted Average Grant Date Fair Value	$ 116.37	$ 109.55
Granted, Weighted Average Grant Date Fair Value	115.04	118.60
Vested, Weighted Average Grant Date Fair Value	110.68	85.44
Forfeited, Weighted Average Grant Date Fair Value	116.82	112.24
Outstanding, end of period, Weighted Average Grant Date Fair Value	$ 117.37	$ 117.56
Performance-Based and Market-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, beginning of period, Shares	97,043	86,252
Granted, Shares	62,143	54,415
Vested, Shares	(43,506)	(36,499)
Outstanding, end of period, Shares	115,680	104,168
Outstanding, beginning of period, Weighted Average Grant Date Fair Value	$ 119.59	$ 110.70
Granted, Weighted Average Grant Date Fair Value	114.66	105.10
Vested, Weighted Average Grant Date Fair Value	122.27	80.26
Outstanding, end of period, Weighted Average Grant Date Fair Value	$ 115.93	$ 118.45

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Earnings Per Share and Shareholders' Equity Transactions (Information Regarding Basic and Diluted Earnings Per Share) (Details) - $ / shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic shares used in the calculation of earnings per share	36.4	38.3
Diluted shares used in the calculation of earnings per share	36.9	38.3
Per share effect of dilutive securities on income (loss) from continuing operations	$ (0.03)
Per share effect of dilutive securities on net income	$ (0.04)
Employee Stock Options [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.3
Non-Vested Stock Grants [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.2

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Earnings Per Share and Shareholders' Equity Transactions (Information Regarding Basic and Diluted Earnings Per Share) (Parenthetical) (Details) shares in Millions	3 Months Ended
	Mar. 31, 2020 shares
Earnings Per Share [Abstract]
Antidilutive securities excluded from calculation of earnings per share	0.6

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Earnings Per Share and Shareholders' Equity Transactions (Narrative) (Details) - USD ($) shares in Thousands			3 Months Ended
	Jan. 29, 2021	Oct. 29, 2020	Mar. 31, 2021	Mar. 31, 2020
Class Of Stock [Line Items]
Antidilutive securities excluded from calculation of earnings per share				600
Accelerated Share Repurchase Agreement [Member]
Class Of Stock [Line Items]
Stock repurchase program, available authorized repurchase amount			$ 78,000,000
October 2020 ASR [Member]
Class Of Stock [Line Items]
Amount paid by company		$ 100,000,000.0
Initial delivery of shares of common stock received		800
Shares repurchased under repurchase agreement, percentage		80.00%
Common stock shares received as final settlement of shares repurchased	45
Maximum [Member] | Accelerated Share Repurchase Agreement [Member]
Class Of Stock [Line Items]
Repurchases common stock, authorized			$ 900,000,000
Stock Compensation Plans [Member]
Class Of Stock [Line Items]
Antidilutive securities excluded from calculation of earnings per share			200	400

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Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses (Schedule of Liability for Unpaid Losses and Loss Adjustment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Insurance [Abstract]
Gross reserve for losses and LAE, beginning of period	$ 6,024.0	$ 5,654.4
Reinsurance recoverable on unpaid losses, beginning of period	1,641.6	1,574.8
Net reserve for losses and LAE, beginning of period	4,382.4	4,079.6
Net incurred losses and LAE in respect of losses occurring in current year	789.5	730.2
Net incurred losses and LAE in respect of losses occurring in prior years	(8.2)	(2.0)
Total incurred losses and LAE	781.3	728.2
Net payments of losses and LAE in respect of losses occurring in current year	178.5	174.6
Net payments of losses and LAE in respect of losses occurring in prior years	435.0	484.4
Total payments	613.5	659.0
Net reserve for losses and LAE, end of period	4,550.2	4,148.8
Reinsurance recoverable on unpaid losses, end of period	1,673.5	1,576.1
Gross reserve for losses and LAE, end of period	$ 6,223.7	$ 5,724.9

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Liabilities for Outstanding Claims, Losses and Loss Adjustment Expenses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Insurance [Abstract]
(Favorable) unfavorable loss and LAE development	$ (8.2)	$ (2.0)