Assurant (AIZ) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity Registrant Name	Assurant, Inc.
Entity Incorporation, State or Country Code	DE
Entity File Number	001-31978
Entity Tax Identification Number	39-1126612
Entity Address, Address Line One	28 Liberty Street
Entity Address, Address Line Two	41st Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10005
City Area Code	212
Local Phone Number	859-7000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		60,566,633
Entity Central Index Key	0001267238
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	AIZ
Security Exchange Name	NYSE
5.25% Subordinated Notes due 2061
Entity Listings [Line Items]
Title of 12(b) Security	5.25% Subordinated Notes due 2061
Trading Symbol	AIZN
Security Exchange Name	NYSE

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Investments:
Fixed maturity securities available for sale, at fair value (net of allowances for credit losses of $1.2 at March 31, 2021 and December 31, 2020; amortized cost - $6,206.8 and $6,245.8 at March 31, 2021 and December 31, 2020, respectively)		$ 6,575.9	$ 6,815.5
Equity securities at fair value		293.2	290.2
Commercial mortgage loans on real estate, at amortized cost (net of allowances for credit losses of $1.2 and $1.6 at March 31, 2021 and December 31, 2020, respectively)		147.9	138.3
Short-term investments		145.3	292
Other investments (net of allowances for credit losses of $1.4 at March 31, 2021 and December 31, 2020)		707.7	686.8
Total investments		7,870	8,222.8
Cash and cash equivalents		1,651.3	2,207.6
Premiums and accounts receivable (net of allowances for credit losses of $12.2 and $13.3 at March 31, 2021 and December 31, 2020, respectively)		1,924.2	1,548.9
Reinsurance recoverables (net of allowances for credit losses of $22.8 and $24.6 at March 31, 2021 and December 31, 2020, respectively)		6,528.1	6,605.4
Accrued investment income		73.3	67
Deferred acquisition costs		7,649.7	7,388
Property and equipment, net		469.1	446.1
Goodwill		2,586	2,589.3
Value of business acquired		988	1,152.2
Other intangible assets, net		672.7	696.2
Other assets (net of allowances for credit losses of $1.8 at March 31, 2021 and December 31, 2020)		495.4	496.2
Assets held in separate accounts		11.3	11.5
Assets held for sale (Note 4)		13,491.5	13,218.7
Total assets		44,410.6	44,649.9
Liabilities
Future policy benefits and expenses		1,356.5	1,358.5
Unearned premiums		17,301	17,293.1
Claims and benefits payable		1,578	1,610.3
Commissions payable		599	699.1
Reinsurance balances payable		422.2	359.3
Funds held under reinsurance		359.8	358.6
Accounts payable and other liabilities		2,388.3	2,640.5
Debt		2,203.7	2,252.9
Liabilities related to separate accounts		11.3	11.5
Liabilities held for sale (Note 4)		12,365.2	12,111.3
Total liabilities		38,585	38,695.1
Commitments and contingencies (Note 16)
Stockholders’ equity
6.50% Series D mandatory convertible preferred stock, par value $1.00 per share, 0 shares and 2,875,000 shares authorized, issued and outstanding at March 31, 2021 and December 31, 2020, respectively (1)	[1]	0	2.9
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 62,947,351 and 62,967,808 shares issued and 60,651,262 and 57,967,808 shares outstanding at March 31, 2021 and December 31, 2020, respectively		0.7	0.6
Additional paid-in capital		1,804.3	1,956.8
Retained earnings		3,635.5	3,548.7
Accumulated other comprehensive income		504.5	709.8
Treasury stock, at cost; 2,296,089 and 5,000,000 shares at March 31, 2021 and December 31, 2020, respectively		(122.8)	(267.4)
Total Assurant, Inc. stockholders’ equity		5,822.2	5,951.4
Non-controlling interests		3.4	3.4
Total equity		5,825.6	5,954.8
Total liabilities and equity		$ 44,410.6	$ 44,649.9
[1]	Each outstanding share of mandatory convertible preferred stock converted to common stock in March 2021. Refer to Note 13 for further information.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fixed maturity securities available for sale, amortized cost	$ 6,206.8
Commercial mortgage loans on real estate, allowances for expected credit losses	1.2	$ 1.6
Other investments, allowances for credit losses	1.4	1.4
Premiums and accounts receivable, allowances for expected credit losses	12.2	13.3
Reinsurance recoverables, allowances for expected credit losses	22.8	24.6
Other assets, allowances for credit losses	$ 1.8	$ 1.8
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares, issued (in shares)	62,947,351	62,967,808
Common stock, shares outstanding (in shares)	60,651,262	57,967,808
Treasury stock, at cost (in shares)	2,296,089	5,000,000
Fixed maturity securities
Fixed maturity securities available for sale, allowances for credit losses	$ 1.2	$ 1.2
Fixed maturity securities available for sale, amortized cost	$ 6,206.8	$ 6,245.8
Series D Preferred Stock
Share interest rate	6.50%	6.50%
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	0	2,875,000
Preferred stock, shares issued (in shares)	0	2,875,000
Preferred stock, shares outstanding (in shares)	0	2,875,000

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Net earned premiums	$ 2,105.6	$ 2,065.5
Fees and other income	249.9	383.6
Net investment income	76.3	83.6
Net realized gains (losses) on investments (including $1.0 and $5.3 of impairment losses for the three months ended March 31, 2021 and 2020, respectively)	0.8	(84)
Total revenues	2,432.6	2,448.7
Benefits, losses and expenses
Policyholder benefits	528.7	535.2
Amortization of deferred acquisition costs and value of business acquired	946.7	895.3
Underwriting, general and administrative expenses	735.7	892.6
Interest expense	28.4	25.5
Total benefits, losses and expenses	2,239.5	2,348.6
Income from continuing operations before income tax expense (benefit)	193.1	100.1
Income tax expense (benefit)	44.6	(48.5)
Net income from continuing operations	148.5	148.6
Net income from discontinued operations (Note 4)	14.3	7.2
Net income	162.8	155.8
Less: Net loss (income) attributable to non-controlling interests	0.2	(1.1)
Net income attributable to stockholders	163	154.7
Less: Preferred stock dividends	(4.7)	(4.7)
Net income attributable to common stockholders	$ 158.3	$ 150
Basic
Net income from continuing operations (in dollars per share)	$ 2.43	$ 2.36
Net income from discontinued operations (in dollars per share)	0.24	0.12
Net income attributable to common stockholders (in dollars per share)	2.67	2.48
Diluted
Net income from continuing operations (in dollars per share)	2.41	2.32
Net income from discontinued operations (in dollars per share)	0.23	0.11
Net income attributable to common stockholders (in dollars per share)	$ 2.64	$ 2.43
Share Data
Weighted average common shares outstanding used in basic per common share calculations (in shares)	59,192,880	60,602,911
Plus: Dilutive securities (in shares)	2,590,512	3,024,015
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	61,783,392	63,626,926

Consolidated Statements of Op_2

Consolidated Statements of Operations (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Impairment loss	$ 1	$ 5.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income		$ 162.8	$ 155.8
Other comprehensive (loss) income:
Change in unrealized gains on investments, net of taxes of $58.6 and $85.1 for the three months ended March 31, 2021 and 2020, respectively		(209.5)	(302.1)
Change in unrealized gains on derivative transactions, net of taxes of $0.2 for each of the three months ended March 31, 2021 and 2020		(0.6)	(0.6)
Change in non-credit related impairment losses, net of taxes of $0.2 and $0.7 for the three months ended March 31, 2021 and 2020, respectively		(0.8)	(2.7)
Change in foreign currency translation, net of taxes of $2.1 and $9.7 for the three months ended March 31, 2021 and 2020, respectively		7.2	(66.7)
Change in pension and postretirement unrecognized net periodic benefit cost, net of taxes of $0.5, $(0.1), ($12.6) and $(0.1) for the three and six months ended June 30, 2020 and 2019, respectively	[1]	(1.6)	49
Total other comprehensive loss		(205.3)	(323.1)
Total comprehensive loss		(42.5)	(167.3)
Less: Comprehensive loss (income) attributable to non-controlling interests		0.2	(1.1)
Total comprehensive loss attributable to stockholders		$ (42.3)	$ (168.4)
[1]	Change in three months ended March 31, 2020 includes the prior service credit resulting from the February 2020 amendment of the Retirement Health Benefits plan. Refer to Note 15 for further information.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Change in unrealized gains on securities, tax	$ 58.6	$ 85.1
Change in unrealized gains on derivative transactions, tax	0.2	0.2
Change in non-credit related impairment losses, tax	0.2	0.7
Change in foreign currency transaction, tax	2.1	9.7
Change in pension and postretirement unrecognized net periodic benefit cost, tax	$ 0.5	$ (13)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non-controlling Interests	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, AdjustmentRetained Earnings	[1]
Beginning balance at Dec. 31, 2019	$ 5,682.1	$ 2.9	$ 1.6	$ 4,537.7	$ 5,966.4	$ 411.5	$ (5,267.3)	$ 29.3	$ (20.4)		$ (20.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan issuances	3.9			3.9
Stock plan compensation expense	11.5			11.5
Common stock dividends	(38)				(38)
Acquisition of common stock	(69.8)			(12.5)			(57.3)
Net income (loss)	155.8				154.7			1.1
Preferred stock dividends	(4.7)				(4.7)			0
Change in equity of non-controlling interests	(11.1)				3.1			(14.2)
Other comprehensive income	$ (323.1)					(323.1)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Ending balance at Mar. 31, 2020	$ 5,386.2	2.9	1.6	4,540.6	6,061.1	88.4	(5,324.6)	16.2
Beginning balance at Dec. 31, 2020	5,954.8	2.9	0.6	1,956.8	3,548.7	709.8	(267.4)	3.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan issuances	5.4			5.4
Stock plan compensation expense	13.2			13.2
Common stock dividends	(38.2)				(38.2)
Acquisition of common stock	(62.6)			(29.3)	(33.3)		0
Net income (loss)	162.8				163			(0.2)
Preferred stock conversion		(2.9)	0.1	(141.8)			144.6
Preferred stock dividends	(4.7)				(4.7)
Change in equity of non-controlling interests	0.2				0			0.2
Other comprehensive income	(205.3)					(205.3)
Ending balance at Mar. 31, 2021	$ 5,825.6	$ 0	$ 0.7	$ 1,804.3	$ 3,635.5	$ 504.5	$ (122.8)	$ 3.4
[1]	Amount relates to the adoption of the accounting standard for accounting for expected credit losses for assets held at amortized cost, which established allowances for such expected credit losses as of January 1, 2020.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock dividends (usd per share)	$ 0.66	$ 0.63
Preferred stock dividends (usd per share)	$ 1.63	$ 1.63

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Net income attributable to stockholders		$ 163	$ 154.7
Noncash revenues, expenses, gains and losses included in net income from continuing operations:
Deferred tax expense		19.2	120
Depreciation and amortization		41.4	32.5
Net realized (gains) losses on investments, including impairment losses		(0.8)	84
Stock based compensation expense		13.2	11.5
Ike related charges, net of derivative gains		0	1.4
Changes in operating assets and liabilities:
Change in insurance policy reserves and expenses		4.9	24.5
Change in premiums and accounts receivable		(385)	47.6
Change in commissions payable		(142.6)	(108.6)
Change in reinsurance recoverable		69.9	(9.5)
Change in reinsurance balance payable		64	(7.7)
Change in funds withheld under reinsurance		0.6	34.5
Change in deferred acquisition costs and value of business acquired		(111.4)	(95.2)
Change in taxes payable (receivable)		6.5	(190.4)
Change in other assets and other liabilities		(187.9)	(289.4)
Other		(9)	22.6
Net cash provided by operating activities - discontinued operations		35.3	43.8
Net cash used in operating activities		(418.7)	(123.7)
Sales of:
Fixed maturity securities available for sale		215.5	199.4
Equity securities		3.4	1.7
Other invested assets		25.8	30.9
Maturities, calls, prepayments, and scheduled redemption of:
Fixed maturity securities available for sale		239	160.7
Commercial mortgage loans on real estate		4.2	3.1
Purchases of:
Fixed maturity securities available for sale		(390.6)	(297.1)
Equity securities		(10.3)	(12.2)
Commercial mortgage loans on real estate		(10)	0
Other invested assets		(12.2)	(5.7)
Property and equipment and other		(39.6)	(20.3)
Subsidiaries, net of cash transferred		(4.1)	0
Consolidated investment entities
Purchases of investments	[1]	0	(258.7)
Sale of investments	[1]	0	310.3
Change in short-term investments		41.6	125.3
Other		0.5	0.3
Net cash used in investing activities - discontinued operations		(48.7)	(55.8)
Net cash provided by investing activities		14.5	181.9
Financing activities
Repayment of debt		(50)	0
Repayment of debt for consolidated investment entities	[1]	0	(0.7)
Borrowings under unsecured revolving credit facility		0	200
Acquisition of common stock		(42)	(56.6)
Common stock dividends paid		(38.2)	(38)
Preferred stock dividends paid		(4.7)	(4.7)
Employee stock purchases and withholdings		(18.1)	(8.6)
Net cash provided by (used in) financing activities - discontinued operations		0	0
Net cash (used in) provided by financing activities		(153)	91.4
Effect of exchange rate changes on cash and cash equivalents - continuing operations		0	(16.4)
Effect of exchange rate changes on cash and cash equivalents - discontinued operations		0.2	(0.4)
Effect of exchange rate changes on cash and cash equivalents		0.2	(16.8)
Change in cash and cash equivalents		(557)	132.8
Cash and cash equivalents at beginning of period		2,228.6	1,867.1
Cash and cash equivalents at end of period		1,671.6	1,999.9
Less: Cash and cash equivalents of discontinued operations at end of period		20.3	3.8
Cash and cash equivalents of continuing operations at end of period		$ 1,651.3	$ 1,996.1
[1]	Relates to cash flows from the Company’s variable interest entities.

Nature of Operations

Nature of Operations	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Assurant, Inc. (the “Company”) is a global provider of lifestyle and housing solutions that support, protect and connect major consumer purchases. The Company partners with leading brands to develop innovative products and services and to deliver enhanced customer experience. The Company operates in North America, Latin America, Europe and Asia Pacific through two operating segments: Global Lifestyle and Global Housing. Through its Global Lifestyle segment, the Company provides mobile device solutions and extended service products and related services for consumer electronics and appliances (referred to as “Connected Living”); vehicle protection and related services (referred to as “Global Automotive”); and credit and other insurance products (referred to as “Global Financial Services and Other”). Through its Global Housing segment, the Company provides lender-placed homeowners insurance, lender-placed manufactured housing insurance and lender-placed flood insurance (referred to as “Lender-placed Insurance”); renters insurance and related products (referred to as “Multifamily Housing”); and voluntary manufactured housing insurance, voluntary homeowners insurance and other specialty products (referred to as “Specialty and Other”). The businesses previously reported as the Global Preneed segment, through which the Company provides pre-funded funeral insurance, final need insurance and related services, as well as certain businesses previously disposed of through reinsurance, which were previously reported in the Corporate and Other segment, have been classified as held for sale. Refer to Note 4 for additional information on the pending sale.The Company’s common stock is traded on the New York Stock Exchange under the symbol “AIZ”.

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. The interim financial data as of March 31, 2021 and for the three months ended March 31, 2021 and 2020 is unaudited. In the opinion of management, the interim data includes all adjustments necessary for a fair statement of the results for the interim periods. The unaudited interim Consolidated Financial Statements include the accounts of the Company and all of its wholly owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current year presentation, including the impacts of held for sale and discontinued operations as further summarized in Note 4.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Simplifying the Accounting for Income Taxes : In December 2019, the Financial Accounting Standards Board (“FASB”) issued new guidance to simplify the accounting for income taxes by removing certain exceptions to the general principles and also simplify areas such as franchise taxes, step-up in tax basis goodwill, separate entity financial statements and interim recognition of enactment of tax laws or rate changes. The standard was adopted by the Company beginning on January 1, 2021 with no material impact on its financial position or results of operations. Not Yet Adopted Targeted improvements to the accounting for long-duration contracts : In August 2018, the FASB issued guidance that provides targeted improvements to the accounting for long-duration contracts. The guidance includes the following primary changes: assumptions supporting benefit reserves will no longer be locked-in but must be updated at least annually with the impact of changes to the liability reflected in earnings (except for discount rates); the discount rate assumptions will be based on the upper-medium grade (low credit risk) fixed-income instrument yield instead of the earnings rate of invested assets; the discount rate must be evaluated at each reporting date and the impact of changes to the liability estimate as a result of updating the discount rate assumption is required to be recognized in other comprehensive income; the provision for adverse deviation is eliminated; and premium deficiency testing is eliminated. Other noteworthy changes include the following: differing models for amortizing deferred acquisition costs will become uniform for all long-duration contracts based on a constant rate over the expected term of the related in-force contracts; all market risk benefits associated with deposit contracts must be reported at fair value with changes reflected in income except for changes related to credit risk which will be recognized in other comprehensive income; and disclosures will be expanded to include disaggregated roll forwards of the liability for future policy benefits, policyholder account balances, market risk benefits, separate account liabilities, and deferred acquisition costs, as well as information about significant inputs, judgments, assumptions and methods used in measurement. The guidance is effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. Early adoption is permitted. Generally, the amendments are applied retrospectively as of the beginning of the earliest period presented with two transition options available for changing the assumptions. The Company is evaluating the requirements of this guidance and the potential impact on the Company’s financial position and results of operations. Facilitation of the Effects of Reference Rate Reform on Financial Reporting: In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The relief is applicable only to legacy contracts if the amendments made to the agreements are solely for reference rate reform activities. The provisions must be applied consistently for all relevant transactions other than derivatives, which may be applied at a hedging relationship level. The guidance is effective upon issuance. The guidance on contract modifications is applied prospectively from any date beginning March 12, 2020. Unlike other topics, the provisions of this update are only available until December 31, 2022, when the reference rate replacement activity is expected to have been completed. As certain published LIBOR periods are expected to be discontinued after 2021, the Company is evaluating the provisions of this new accounting guidance and the impact to debt, investments and derivatives that have references to LIBOR and the subsequent transition to alternative reference rates. Improvements to Convertible Instruments and Contracts in an Entity’s Own Equity : In August 2020, the FASB issued guidance that simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument and more convertible preferred stock as a single equity instrument with no separate accounting for embedded conversion features. The guidance removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more contracts in an entity’s own equity to qualify for it. The guidance also simplifies the diluted earnings per common share (“EPS”) calculation in the areas of convertible instruments and instruments that qualify for the derivatives scope exception for contracts in an entity’s own equity to address accounting for the guidance changes to the classification, recognition and measurement. This guidance will be effective for the Company beginning January 1, 2022. Early adoption is permitted. The Company is evaluating the requirements of this guidance and the potential impact on its financial position and results of operations.

Business Held for Sale and Disc

Business Held for Sale and Discontinued Operations	3 Months Ended
	Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Business Held for Sale and Discontinued Operations	Business Held for Sale and Discontinued Operations In March 2021, the Company entered into a definitive agreement to sell the legal entities which comprise the businesses previously reported as the Global Preneed segment and certain businesses previously disposed of through reinsurance, which were previously reported in the Corporate and Other segment (collectively, the “disposal business”) to CUNA Mutual Group (“CUNA”) for total cash consideration of $1.25 billion, subject to certain purchase price adjustments at closing. The transaction is expected to close by the end of the third quarter of 2021, subject to regulatory approvals and other customary closing conditions. The estimated carrying value of the disposal business is subject to adjustment in future quarters until closing, and may be influenced by various factors including the following: • The performance of the disposal business, including the impact of discount, interest, mortality and reinsurance rates; and • Changes in the terms of the agreement with CUNA, including as a result of any subsequent negotiations, any necessary changes to obtain regulatory approval or any changes due to unanticipated developments. The Company reports a business as held for sale when management has received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the ensuing year and certain other specified criteria are met. A business classified as held for sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell, which is required to be remeasured each reporting period. If the carrying amount of the business exceeds its estimated fair value, which is based on the estimated sales price of the transaction, less costs to sell, a loss is recognized. Depreciation is not recorded on assets of a business classified as held for sale. The Company reports the results of operations of a business as discontinued operations if (i) the business is classified as held for sale; (ii) the business represents a strategic shift that will have a major impact on the Company’s operations and financial results; (iii) the operations and cash flows of the business have been or will be eliminated from the ongoing operations of the Company as a result of the disposal transaction and (iv) the Company will not have any significant continuing involvement in the operations of the business after the disposal transaction. The results of discontinued operations are reported in net income from discontinued operations in the consolidated statements of operations for all periods presented, commencing in the period in which the business is either disposed of or is classified as held for sale, including any gain or loss recognized on closing or adjustment of the carrying amount to fair value less costs to sell. Assets and liabilities related to a business classified as held for sale which also meets the criteria for discontinued operations are segregated in the consolidated balance sheets for the current and prior periods presented. The Company has determined that the disposal business meets the criteria to be classified as held for sale and that the sale represents a strategic shift that will have a major impact on the Company’s operations and financial results. Accordingly, the results of operations of the disposal business are presented as net income from discontinued operations in the consolidated statements of operations and segregated in the consolidated statement of cash flows for all periods presented, and the assets and liabilities for the disposal business have been classified as held for sale and segregated for all periods presented in the consolidated balance sheets. The following table presents the major classes of assets and liabilities held for sale included in the consolidated balance sheets. March 31, 2021 December 31, 2020 Assets Investments: Fixed maturity securities available for sale, at fair value $ 6,325.0 $ 6,633.5 Equity securities at fair value 111.0 113.9 Commercial mortgage loans on real estate, at amortized cost 606.1 616.0 Short-term investments 142.5 41.2 Other investments 15.1 52.0 Total investments 7,199.7 7,456.6 Cash and cash equivalents 20.3 21.0 Premiums and accounts receivable 7.3 7.5 Reinsurance recoverables 3,244.0 3,234.5 Accrued investment income 66.5 62.7 Deferred acquisition costs 651.0 185.5 Property and equipment, net 47.2 47.2 Value of business acquired 4.1 4.3 Other assets 21.3 22.6 Assets held in separate accounts 2,230.1 2,176.8 Total assets held for sale $ 13,491.5 $ 13,218.7 Liabilities Future policy benefits and expenses $ 8,806.0 $ 8,703.5 Unearned premiums 102.1 14.9 Claims and benefits payable 1,019.0 1,049.2 Commissions payable 10.3 9.4 Reinsurance balances payable 3.5 3.1 Accounts payable and other liabilities 194.2 154.4 Liabilities related to separate accounts 2,230.1 2,176.8 Total liabilities held for sale $ 12,365.2 $ 12,111.3 The following table summarizes the components of net income from discontinued operations included in the consolidated statements of operations: Three Months Ended March 31, 2021 2020 Revenues Net earned premiums $ 17.7 $ 18.3 Fees and other income 37.5 37.5 Net investment income 72.0 72.4 Net realized losses on investments (1.1) (11.3) Total revenues 126.1 116.9 Benefits, losses and expenses Policyholder benefits 74.0 72.0 Amortization of deferred acquisition costs and value of business acquired 19.2 18.9 Underwriting, general and administrative expenses 21.8 16.9 Total benefits, losses and expenses 115.0 107.8 Income from discontinued operations before income taxes 11.1 9.1 (Benefit) provision for income taxes (3.2) 1.9 Net income from discontinued operations $ 14.3 $ 7.2

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Information	Segment Information As of March 31, 2021, the Company had three reportable segments, excluding discontinued operations described above, which are defined based on the manner in which the Company’s chief operating decision maker, the Chief Executive Officer (“CEO”), reviews the business to assess performance and allocate resources, and which align to the nature of the products and services offered: • Global Lifestyle; • Global Housing; and • Corporate and Other: includes activities of the holding company, financing and interest expenses, net realized gains (losses) on investments (which includes unrealized gains (losses) on equity securities and changes in fair value of direct investments in collateralized loan obligations), interest income earned from short-term investments held, income (expenses) primarily related to the Company’s frozen benefit plans, amounts related to businesses previously disposed of through reinsurance and the run-off of the Assurant Health business. Corporate and Other also includes goodwill impairments, the foreign currency gains (losses) from remeasurement of monetary assets and liabilities, changes in the fair value of derivative instruments and other expenses related to merger and acquisition activities, as well as other highly variable or unusual items other than reportable catastrophes (reportable catastrophe losses, net of reinsurance and client profit sharing adjustments, and including reinstatement and other premiums). The following tables summarize selected financial information by segment: Three Months Ended March 31, 2021 Global Lifestyle Global Housing Corporate Consolidated Revenues Net earned premiums $ 1,648.7 $ 456.9 $ — $ 2,105.6 Fees and other income 213.6 36.1 0.2 249.9 Net investment income 50.8 19.4 6.1 76.3 Net realized gains on investments — — 0.8 0.8 Total revenues 1,913.1 512.4 7.1 2,432.6 Benefits, losses and expenses Policyholder benefits 327.4 201.3 — 528.7 Amortization of deferred acquisition costs and value of business acquired 889.2 57.5 — 946.7 Underwriting, general and administrative expenses 527.2 168.8 39.7 735.7 Interest expense — — 28.4 28.4 Total benefits, losses and expenses 1,743.8 427.6 68.1 2,239.5 Segment income (loss) from continuing operations before provision (benefit) for income tax 169.3 84.8 (61.0) 193.1 Provision (benefit) for income taxes 40.2 17.4 (13.0) 44.6 Segment net income (loss) from continuing operations $ 129.1 $ 67.4 $ (48.0) 148.5 Net income from discontinued operations 14.3 Net income 162.8 Less: Net loss attributable to non-controlling interests 0.2 Net income attributable to stockholders 163.0 Less: Preferred stock dividends (4.7) Net income attributable to common stockholders $ 158.3 As of March 31, 2021 Segment assets: $ 24,335.2 $ 3,892.2 $ 16,183.2 $ 44,410.6 Three Months Ended March 31, 2020 Global Lifestyle Global Housing Corporate Consolidated Revenues Net earned premiums $ 1,597.7 $ 467.8 $ — $ 2,065.5 Fees and other income 349.2 32.6 1.8 383.6 Net investment income 54.7 22.0 6.9 83.6 Net realized losses on investments — — (84.0) (84.0) Total revenues 2,001.6 522.4 (75.3) 2,448.7 Benefits, losses and expenses Policyholder benefits 336.2 198.7 0.3 535.2 Amortization of deferred acquisition costs and value of business acquired 838.4 56.9 — 895.3 Underwriting, general and administrative expenses 667.9 173.3 51.4 892.6 Interest expense — — 25.5 25.5 Total benefits, losses and expenses 1,842.5 428.9 77.2 2,348.6 Segment income (loss) from continuing operations before provision (benefit) for income taxes 159.1 93.5 (152.5) 100.1 Provision (benefit) for income taxes 38.2 19.3 (106.0) (48.5) Segment net income (loss) from continuing operations $ 120.9 $ 74.2 $ (46.5) 148.6 Net income from discontinued operations 7.2 Net income 155.8 Less: Net income attributable to non-controlling interest (1.1) Net income attributable to stockholders 154.7 Less: Preferred stock dividends (4.7) Net income attributable to common stockholders $ 150.0

Contract Revenues

Contract Revenues	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract Revenues	Contract Revenues The Company partners with clients to provide consumers a diverse range of protection products and services. The Company’s revenues from protection products are accounted for as insurance contracts and are recognized over the term of the insurance protection provided. Revenues from service contracts and sales of products are recognized as the contractual performance obligations are satisfied or the products are delivered. Revenue is measured as the amount of consideration the Company expects to be entitled to in exchange for performing the services or transferring products. If payments are received before the related revenue is recognized, the amount is recorded as unearned revenue or advance payment liabilities, until the performance obligations are satisfied or the products are transferred. The disaggregated revenues from service contracts included in fees and other income on the consolidated statements of operations are $164.9 million and $299.1 million for Global Lifestyle and $24.5 million and $22.1 million for Global Housing for the three months ended March 31, 2021 and 2020, respectively. Global Lifestyle In the Company’s Global Lifestyle segment, revenues from service contracts and sales of products are primarily from the Company’s Connected Living business. Through partnerships with mobile carriers, the Company provides administrative services related to its mobile device protection products, including program design and marketing strategy, risk management, data analytics, customer support and claims handling, supply chain and service delivery, repair and logistics, and device disposition. Administrative fees are generally billed monthly based on the volume of services provided during the billing period (for example, based on the number of mobile subscribers) with payment due within a short-term period. Each service or bundle of services, depending on the contract, is an individual performance obligation with a standalone selling price. The Company recognizes revenue as it invoices, which corresponds to the value transferred to the customer. The Company also repairs, refurbishes and then sells mobile and other electronic devices, on behalf of its clients, for a bundled per unit fee. The entire processing of the device is considered one performance obligation with a standalone selling price and thus, the per unit fee is recognized when the products are sold. Payments are generally due prior to shipment or within a short-term period. Global Housing In the Company’s Global Housing segment, revenues from service contracts and sales of products are primarily from the Company’s Lender-placed Insurance business. Under the Company’s Lender-placed Insurance business, the Company provides loan and claim payment tracking services for lenders. The Company generally invoices its customers weekly or monthly based on the volume of services provided during the billing period with payment due within a short-term period. Each service is an individual performance obligation with a standalone selling price. The Company recognizes revenue as it invoices, which corresponds to the value transferred to the customer. Contract Balances The receivables and unearned revenue under these contracts were $219.9 million and $91.6 million, respectively, as of March 31, 2021, and $257.9 million and $89.8 million, respectively, as of December 31, 2020. These balances are included in premiums and accounts receivable and accounts payable and other liabilities, respectively, in the consolidated balance sheets. Revenue from service contracts and sales of products recognized during the three months ended March 31, 2021 and 2020 that was included in unearned revenue as of December 31, 2020 and 2019 was $11.7 million and $20.2 million, respectively.

Investments

Investments	3 Months Ended
	Mar. 31, 2021
Investments [Abstract]
Investments	Investments The following tables show the cost or amortized cost, allowance for credit losses, gross unrealized gains and losses, and fair value of the Company’s fixed maturity securities as of the dates indicated: March 31, 2021 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 72.5 $ — $ 2.9 $ (0.4) $ 75.0 States, municipalities and political subdivisions 174.6 — 8.1 (2.0) 180.7 Foreign governments 422.0 — 13.6 (1.1) 434.5 Asset-backed 268.3 — 13.3 (0.4) 281.2 Commercial mortgage-backed 280.0 — 12.8 (2.9) 289.9 Residential mortgage-backed 629.4 — 37.6 (0.6) 666.4 U.S. corporate 3,273.8 (1.2) 271.3 (26.4) 3,517.5 Foreign corporate 1,086.2 — 56.5 (12.0) 1,130.7 Total fixed maturity securities $ 6,206.8 $ (1.2) $ 416.1 $ (45.8) $ 6,575.9 December 31, 2020 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 90.4 $ — $ 3.7 $ — $ 94.1 States, municipalities and political subdivisions 164.4 — 11.0 (0.1) 175.3 Foreign governments 442.4 — 27.4 (0.1) 469.7 Asset-backed 251.9 — 9.4 (0.8) 260.5 Commercial mortgage-backed 266.3 — 16.5 (1.4) 281.4 Residential mortgage-backed 685.8 — 49.0 (0.2) 734.6 U.S. corporate 3,315.6 (1.2) 380.6 (4.4) 3,690.6 Foreign corporate 1,029.0 — 80.6 (0.3) 1,109.3 Total fixed maturity securities $ 6,245.8 $ (1.2) $ 578.2 $ (7.3) $ 6,815.5 The Company’s state, municipality and political subdivision holdings are highly diversified across the U.S., with no individual state, municipality or political subdivision exposure (including both general obligation and revenue securities) exceeding 0.4% of the overall investment portfolio as of March 31, 2021 and December 31, 2020. As of March 31, 2021 and December 31, 2020, the securities included general obligation and revenue bonds issued by states, cities, counties, school districts and similar issuers, including $39.5 million and $39.6 million, respectively, of advance refunded or escrowed-to-maturity bonds (collectively referred to as “pre-refunded revenue bonds”), which are bonds for which an irrevocable trust has been established to fund the remaining payments of principal and interest. As of March 31, 2021 and December 31, 2020, revenue bonds accounted for 61% and 60% of the holdings, respectively. Excluding pre-refunded revenue bonds, the activities supporting the income streams of the Company’s revenue bonds are across a broad range of sectors, primarily water, airport and marina, specifically pledged tax revenues, leases, colleges and universities and other miscellaneous sources such as bond banks, finance authorities and appropriations. The Company’s investments in foreign government fixed maturity securities are held mainly in countries and currencies where the Company has policyholder liabilities, to facilitate matching of assets to the related liabilities. As of March 31, 2021, approximately 25%, 21% and 16% of the foreign government securities were held in Canadian government/provincials and the governments of Brazil and Mexico, respectively. As of December 31, 2020, approximately 26%, 24% and 16% of the foreign government securities were held in Brazil, Canadian government/provincials and Mexico, respectively. No other country represented more than 10% and 8% of the Company’s foreign government securities as of March 31, 2021 and December 31, 2020, respectively. The Company had European investment exposure in its corporate fixed maturity securities of $617.2 million with a net unrealized gain of $21.6 million as of March 31, 2021 and $589.5 million with a net unrealized gain of $41.8 million as of December 31, 2020. Approximately 34% and 29% of the corporate fixed maturity European exposure was held in the financial industry as of March 31, 2021 and December 31, 2020, respectively. The Company’s largest European country exposure (the United Kingdom) represented approximately 6% of the fair value of the Company’s corporate fixed maturity securities as of March 31, 2021 and December 31, 2020. The Company’s international investments are managed as part of the overall portfolio with the same approach to risk management and focus on diversification. The Company had exposure to the energy sector in its corporate fixed maturity securities of $290.0 million with a net unrealized gain of $19.5 million as of March 31, 2021 and $319.4 million with a net unrealized gain of $23.0 million as of December 31, 2020. Approximately 82% and 81% of the energy exposure is rated as investment grade as of March 31, 2021 and December 31, 2020, respectively. The cost or amortized cost and fair value of fixed maturity securities as of March 31, 2021 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. Cost or Fair Value Due in one year or less $ 359.0 $ 363.5 Due after one year through five years 2,047.5 2,170.5 Due after five years through ten years 1,730.5 1,848.2 Due after ten years 892.1 956.2 Total 5,029.1 5,338.4 Asset-backed 268.3 281.2 Commercial mortgage-backed 280.0 289.9 Residential mortgage-backed 629.4 666.4 Total $ 6,206.8 $ 6,575.9 The following table sets forth the net realized gains (losses), including impairment, recognized in the consolidated statements of operations for the periods indicated: Three Months Ended March 31, 2021 2020 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 3.0 $ 3.7 Equity securities (1) (1.7) (34.9) Commercial mortgage loans on real estate 0.3 (0.2) Other investments 0.2 0.9 Consolidated investment entities (2) — (48.2) Total net realized gains (losses) related to sales and other 1.8 (78.7) Net realized losses related to impairments: Fixed maturity securities — (1.1) Other investments (1) (1.0) (4.2) Total net realized losses related to impairments (1.0) (5.3) Total net realized gains (losses) $ 0.8 $ (84.0) (1) Three months ended March 31, 2021 and 2020 includes $2.1 million and $2.2 million, respectively, of net gains on equity investment holdings accounted for under the measurement alternative. The carrying value of equity investments accounted for under the measurement alternative was $103.3 million and $96.0 million as of March 31, 2021 and 2020, respectively. These investments are included within other investments on the consolidated balance sheets. For the three months ended March 31, 2021 and 2020, there were impairments of $1.0 million and $4.2 million, respectively. For the three months ended March 31, 2021 and 2020, the cumulative carry value fair value increases were $37.1 million and $26.8 million, respectively. For the three months ended March 31, 2021 and 2020, the cumulative impairment losses were $19.6 million and $5.6 million, respectively. (2) Consists of net realized losses from the change in fair value of the Company’s direct investment in collateralized loan obligations (“CLOs”). The following table sets forth the portion of unrealized gains (losses) related to equity securities for the periods indicated: Three Months Ended March 31, 2021 2020 Net losses recognized on equity securities $ (1.7) $ (34.9) Less: Net realized gains related to sales of equity securities 0.9 — Total net unrealized losses on equity securities held $ (2.6) $ (34.9) The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of March 31, 2021 and December 31, 2020 were as follows: March 31, 2021 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 17.9 $ (0.4) $ — $ — $ 17.9 $ (0.4) States, municipalities and political subdivisions 72.3 (2.0) — — 72.3 (2.0) Foreign governments 54.9 (1.1) — — 54.9 (1.1) Asset-backed 80.1 (0.2) 33.4 (0.2) 113.5 (0.4) Commercial mortgage-backed 72.1 (2.3) 2.9 (0.6) 75.0 (2.9) Residential mortgage-backed 36.7 (0.5) 3.1 (0.1) 39.8 (0.6) U.S. corporate 397.8 (23.8) 27.7 (2.6) 425.5 (26.4) Foreign corporate 259.0 (11.9) 3.1 (0.1) 262.1 (12.0) Total fixed maturity securities $ 990.8 $ (42.2) $ 70.2 $ (3.6) $ 1,061.0 $ (45.8) December 31, 2020 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: States, municipalities and political subdivisions $ 6.1 $ (0.1) $ — $ — $ 6.1 $ (0.1) Foreign governments 28.3 (0.1) — — 28.3 (0.1) Asset-backed 54.5 (0.2) 37.4 (0.6) 91.9 (0.8) Commercial mortgage-backed 28.2 (0.7) 3.3 (0.7) 31.5 (1.4) Residential mortgage-backed 23.9 (0.1) 1.5 (0.1) 25.4 (0.2) U.S. corporate 71.9 (2.9) 13.8 (1.5) 85.7 (4.4) Foreign corporate 30.1 (0.3) — — 30.1 (0.3) Total fixed maturity securities $ 243.0 $ (4.4) $ 56.0 $ (2.9) $ 299.0 $ (7.3) Total gross unrealized losses represented approximately 4% and 2% of the aggregate fair value of the related securities as of March 31, 2021 and December 31, 2020, respectively. Approximately 92% and 60% of these gross unrealized losses had been in a continuous loss position for less than twelve months as of March 31, 2021 and December 31, 2020, respectively. The total gross unrealized losses are comprised of 619 and 180 individual securities as of March 31, 2021 and December 31, 2020, respectively. In accordance with its policy, the Company concluded that for these securities, the gross unrealized losses as of March 31, 2021 and December 31, 2020 were related to non-credit factors and therefore, did not recognize credit-related losses during the three months ended March 31, 2021. Additionally, the Company currently does not intend to and is not required to sell these investments prior to an anticipated recovery in value. The Company has entered into commercial mortgage loans, collateralized by the underlying real estate, on properties located throughout the U.S. and Canada. As of March 31, 2021, approximately 53% of the outstanding principal balance of commercial mortgage loans was concentrated in the states of California, Texas and Oregon. Although the Company has a diversified loan portfolio, an economic downturn could have an adverse impact on the ability of its debtors to repay their loans. The outstanding balance of commercial mortgage loans range in size from $0.2 million to $9.9 million as of March 31, 2021 and from $0.1 million to $9.9 million as of December 31, 2020. Credit quality indicators for commercial mortgage loans are loan-to-value and debt-service coverage ratios. The loan-to-value ratio compares the principal amount of the loan to the fair value of the underlying property collateralizing the loan, and is commonly expressed as a percentage. The debt-service coverage ratio compares a property’s net operating income to its debt-service payments and is commonly expressed as a ratio. The loan-to-value and debt-service coverage ratios are generally updated annually in the fourth quarter. The following table presents the amortized cost basis of commercial mortgage loans, excluding the allowance for credit losses, by origination year for certain key credit quality indicators at March 31, 2021 and December 31, 2020. March 31, 2021 Origination Year 2021 2020 2019 2018 2017 Prior Total % of Total Loan to value 70% and less $ 5.5 $ 2.9 $ — $ — $ 4.1 $ 115.4 127.9 85.8 % 71% to 80% $ 4.6 $ 2.6 $ — $ 4.8 $ — $ — 12.0 8.0 % 81% to 95% $ — $ — $ — $ — $ — $ 2.1 2.1 1.4 % Greater than 95% $ — $ — $ — $ — $ 5.9 $ 1.2 7.1 4.8 % Total $ 10.1 $ 5.5 $ — $ 4.8 $ 10.0 $ 118.7 149.1 100.0 % March 31, 2021 Origination Year 2021 2020 2019 2018 2017 Prior Total % of Total Debt service coverage ratios (2): Greater than 2.0 $ 5.8 $ 5.5 $ — $ — $ 4.1 $ 81.8 $ 97.2 65.3 % 1.5 to 2.0 2.9 — — 4.8 — 17.7 25.4 17.0 % 1.0 to 1.5 1.4 — — — — 14.6 16.0 10.7 % Less than 1.0 — — — — 5.9 4.6 10.5 7.0 % Total $ 10.1 $ 5.5 $ — $ 4.8 $ 10.0 $ 118.7 $ 149.1 100.0 % December 31, 2020 Origination Year 2020 2019 2018 2017 2016 Prior Total % of Total Loan to value 70% and less $ 2.9 $ — $ — $ 4.1 $ 29.0 $ 87.1 $ 123.1 88.0 % 71% to 80% 2.6 — 4.8 — — — 7.4 5.3 % 81% to 95% — — — — — 2.2 2.2 1.6 % Greater than 95% — — — 6.0 — 1.2 7.2 5.1 % Total $ 5.5 $ — $ 4.8 $ 10.1 $ 29.0 $ 90.5 $ 139.9 100.0 % December 31, 2020 Origination Year 2020 2019 2018 2017 2016 Prior Total % of Total Debt service coverage ratios (2): Greater than 2.0 $ 5.5 $ — $ — $ 4.1 $ 26.4 $ 53.3 $ 89.3 63.9 % 1.5 to 2.0 — — 4.8 — 2.6 17.5 24.9 17.8 % 1.0 to 1.5 — — — — — 15.0 15.0 10.7 % Less than 1.0 — — — 6.0 — 4.7 10.7 7.6 % Total $ 5.5 $ — $ 4.8 $ 10.1 $ 29.0 $ 90.5 $ 139.9 100.0 % (1) Loan-to-value ratio derived from current loan balance divided by the fair value of the property. The fair value of the underlying commercial properties is updated at least annually.

Fair Value Disclosures

Fair Value Disclosures	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures Fair Values, Inputs and Valuation Techniques for Financial Assets and Liabilities Disclosures The fair value measurements and disclosures guidance defines fair value and establishes a framework for measuring fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company has categorized its recurring fair value basis financial assets and liabilities into a three-level fair value hierarchy based on the priority of the inputs to the valuation technique. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and takes into account factors specific to the asset or liability. The levels of the fair value hierarchy are described below: • Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company can access. • Level 2 inputs utilize other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Level 2 inputs include 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 and inputs other than quoted prices that are observable in the marketplace for the asset or liability. The observable inputs are used in valuation models to calculate the fair value for the asset or liability. • Level 3 inputs are unobservable but are significant to the fair value measurement for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability. The Company reviews fair value hierarchy classifications on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020. The amounts presented below for short-term investments, other investments, cash equivalents, other assets, assets held in and liabilities related to separate accounts and other liabilities differ from the amounts presented in the consolidated balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. Other investments are comprised of investments in the Assurant Investment Plan (“AIP”), the American Security Insurance Company Investment Plan, the Assurant Deferred Compensation Plan, a modified coinsurance arrangement and other derivatives. Other liabilities are comprised of investments in the AIP, contingent considerations related to business combinations and other derivatives. The fair value amount and the majority of the associated levels presented for other investments and assets and liabilities held in separate accounts are received directly from third parties. March 31, 2021 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 75.0 $ — $ 75.0 $ — States, municipalities and political subdivisions 180.7 — 180.7 — Foreign governments 434.5 0.5 433.6 0.4 Asset-backed 281.2 — 279.7 1.5 Commercial mortgage-backed 289.9 — 281.6 8.3 Residential mortgage-backed 666.4 — 666.4 — U.S. corporate 3,517.5 — 3,506.3 11.2 Foreign corporate 1,130.7 — 1,126.9 3.8 Equity securities: Mutual funds 42.1 42.1 — — Common stocks 15.8 13.8 0.6 1.4 Non-redeemable preferred stocks 235.3 — 234.2 1.1 Short-term investments 116.0 87.8 (2) 28.2 — Other investments 231.4 73.0 (1) 158.3 (3) 0.1 Cash equivalents 872.5 831.5 (2) 41.0 (3) — Other assets 0.1 — 0.1 (4) — Assets held in separate accounts 11.2 6.6 (1) 4.6 (3) — Total financial assets $ 8,100.3 $ 1,055.3 $ 7,017.2 $ 27.8 Financial Liabilities Other liabilities $ 75.8 $ 73.0 (1) $ — $ 2.8 (5) Liabilities related to separate accounts 11.2 6.6 (1) 4.6 (3) — Total financial liabilities $ 87.0 $ 79.6 $ 4.6 $ 2.8 December 31, 2020 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 94.1 $ — $ 94.1 $ — States, municipalities and political subdivisions 175.3 — 175.3 — Foreign governments 469.7 0.5 468.8 0.4 Asset-backed 260.5 — 260.5 — Commercial mortgage-backed 281.4 — 272.7 8.7 Residential mortgage-backed 734.6 — 734.6 — U.S. corporate 3,690.6 — 3,678.6 12.0 Foreign corporate 1,109.3 — 1,105.4 3.9 Equity securities: Mutual funds 42.3 42.3 — — Common stocks 15.2 13.3 0.7 1.2 Non-redeemable preferred stocks 232.7 — 231.6 1.1 Short-term investments 253.5 202.0 (2) 51.5 — Other investments 241.3 72.9 (1) 168.3 (3) 0.1 Cash equivalents 1,558.6 1,536.6 (2) 22.0 (3) — Assets held in separate accounts 11.4 6.7 (1) 4.7 (3) — Total financial assets $ 9,170.5 $ 1,874.3 $ 7,268.8 $ 27.4 Financial Liabilities Other liabilities $ 76.1 $ 72.9 (1) $ 0.5 (4) $ 2.7 (5) Liabilities related to separate accounts 11.4 6.7 (1) 4.7 (3) — Total financial liabilities $ 87.5 $ 79.6 $ 5.2 $ 2.7 (1) Primarily includes mutual funds and related obligations. (2) Primarily includes money market funds. (3) Primarily includes fixed maturity securities and related obligations. (4) Primarily includes derivatives. (5) Includes contingent consideration liabilities and other derivatives. The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets as of the dates indicated: March 31, 2021 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 147.9 $ 160.7 $ — $ — $ 160.7 Other investments 50.4 50.4 14.3 — 36.1 Other assets 21.9 21.9 — — 21.9 Total financial assets $ 220.2 $ 233.0 $ 14.3 $ — $ 218.7 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 69.6 $ 81.5 $ — $ — $ 81.5 Funds withheld under reinsurance 359.8 359.8 359.8 — — Debt 2,203.7 2,455.0 — 2,455.0 — Total financial liabilities $ 2,633.1 $ 2,896.3 $ 359.8 $ 2,455.0 $ 81.5 December 31, 2020 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 138.3 $ 198.3 $ — $ — $ 198.3 Other investments 52.1 52.1 14.4 — 37.7 Other assets 23.3 23.3 — — 23.3 Total financial assets $ 213.7 $ 273.7 $ 14.4 $ — $ 259.3 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 70.6 $ 85.4 $ — $ — $ 85.4 Funds withheld under reinsurance 358.6 358.6 358.6 — — Debt 2,252.9 2,540.0 — 2,540.0 — Total financial liabilities $ 2,682.1 $ 2,984.0 $ 358.6 $ 2,540.0 $ 85.4

Reserves

Reserves	3 Months Ended
	Mar. 31, 2021
Insurance Loss Reserves [Abstract]
Reserves	Reserves Reserve Roll Forward The following table provides a roll forward of the Company’s beginning and ending claims and benefits payable balances. Claims and benefits payable is the liability for unpaid loss and loss adjustment expenses and is comprised of case and incurred but not reported (“IBNR”) reserves. Since unpaid loss and loss adjustment expenses are estimates, the Company’s actual losses incurred may be more or less than the Company’s previously developed estimates, which is referred to as either unfavorable or favorable development, respectively. The best estimate of ultimate loss and loss adjustment expense is generally selected from a blend of methods that are applied consistently each period. There have been no significant changes in the methodologies and assumptions utilized in estimating the liability for unpaid loss and loss adjustment expenses for any of the periods presented. For the Three Months Ended March 31, 2021 2020 Claims and benefits payable, at beginning of period $ 1,610.3 $ 1,613.1 Less: Reinsurance ceded and other (849.4) (855.1) Net claims and benefits payable, at beginning of period 760.9 758.0 Incurred losses and loss adjustment expenses related to: Current year 574.9 580.2 Prior years (46.2) (45.0) Total incurred losses and loss adjustment expenses 528.7 535.2 Paid losses and loss adjustment expenses related to: Current year 235.8 277.8 Prior years 268.3 268.9 Total paid losses and loss adjustment expenses 504.1 546.7 Net claims and benefits payable, at end of period 785.5 746.5 Plus: Reinsurance ceded and other (1) 792.5 857.8 Claims and benefits payable, at end of period (1) $ 1,578.0 $ 1,604.3 (1) Includes reinsurance recoverables and claims and benefits payable of $66.1 million and $72.8 million as of March 31, 2021 and 2020, respectively, which was ceded to the U.S. government. The Company acts as an administrator for the U.S. government under the voluntary National Flood Insurance Program.

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	Debt The following table shows the principal amount and carrying value of the Company’s outstanding debt, less unamortized discount and issuance costs as applicable, as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Principal Amount Carrying Value Principal Amount Carrying Value Floating Rate Senior Notes due March 2021 (1) $ — $ — $ 50.0 $ 50.0 4.00% Senior Notes due March 2023 350.0 349.0 350.0 348.9 4.20% Senior Notes due September 2023 300.0 298.5 300.0 298.4 4.90% Senior Notes due March 2028 300.0 297.2 300.0 297.2 3.70% Senior Notes due February 2030 350.0 347.1 350.0 347.0 6.75% Senior Notes due February 2034 275.0 272.3 275.0 272.3 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 (2) 400.0 395.6 400.0 395.4 5.25% Subordinated Notes due January 2061 250.0 244.0 250.0 243.7 Total Debt $ 2,203.7 $ 2,252.9 (1) The outstanding aggregate principal amount was repaid in January 2021. Prior to repayment, these senior notes bore floating interest at a rate equal to three-month LIBOR plus 1.25% per annum. (2) Bears a 7.00% annual interest rate to March 2028 and an annual interest rate equal to three-month LIBOR plus 4.135% thereafter. Credit Facility The Company has a senior unsecured $450.0 million revolving credit agreement (the “Credit Facility”) with a syndicate of banks arranged by JPMorgan Chase Bank, N.A. and Wells Fargo Bank, National Association (the “Lenders”). The Credit Facility provides for revolving loans and the issuance of multi-bank, syndicated letters of credit and letters of credit from a sole issuing bank in an aggregate amount of $450.0 million, which may be increased up to $575.0 million. The Credit Facility is available until December 2022, provided the Company is in compliance with all covenants. The Credit Facility has a sub-limit for letters of credit issued thereunder of $50.0 million. The proceeds from these loans may be used for the Company’s commercial paper program or for general corporate purposes. As of March 31, 2021, no borrowings were outstanding under the Credit Facility, and $445.5 million was available under the Credit Facility due to $4.5 million of letters of credit outstanding. Interest Rate Derivatives

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Certain amounts included in the consolidated statements of comprehensive income are net of reclassification adjustments. The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated: Three Months Ended March 31, 2021 Foreign Net unrealized Net unrealized gains on derivative transactions Credit related impairment Non-credit related impairment Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2020 $ (295.6) $ 1,080.3 $ 14.7 $ 1.2 $ 16.1 $ (106.9) $ 709.8 Change in accumulated other comprehensive income (loss) before reclassifications 7.2 (207.1) — — (0.8) (0.3) (201.0) Amounts reclassified from accumulated other comprehensive income (loss) — (2.4) (0.6) — — (1.3) (4.3) Net current-period other comprehensive income (loss) 7.2 (209.5) (0.6) — (0.8) (1.6) (205.3) Balance at March 31, 2021 $ (288.4) $ 870.8 $ 14.1 $ 1.2 $ 15.3 $ (108.5) $ 504.5 Three Months Ended March 31, 2020 Foreign Net unrealized Net unrealized gains on derivative transactions Credit related impairment Non-credit related impairment Unamortized net (losses) gains on Pension Plans (1) Accumulated Balance at December 31, 2019 $ (358.9) $ 856.5 $ 17.1 $ — $ 15.5 $ (118.7) $ 411.5 Change in accumulated other comprehensive income (loss) before reclassifications (66.7) (297.3) — — (2.7) 48.9 (317.8) Amounts reclassified from accumulated other comprehensive income (loss) — (4.8) (0.6) — — 0.1 (5.3) Net current-period other comprehensive income (loss) (66.7) (302.1) (0.6) — (2.7) 49.0 (323.1) Balance at March 31, 2020 $ (425.6) $ 554.4 $ 16.5 $ — $ 12.8 $ (69.7) $ 88.4 (1) The Retirement Health Benefits plan was amended in February 2020, which resulted in a prior service credit recognized in other comprehensive income that will be recognized in income over the remaining period of the plan. Refer to Note 15 for additional information. The following tables summarize the reclassifications out of accumulated other comprehensive income (“AOCI”) for the periods indicated: Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Three Months Ended March 31, 2021 2020 Net unrealized (gains) losses on investments $ (3.1) $ (6.1) Net realized gains (losses) on investments 0.7 1.3 Provision for income taxes $ (2.4) $ (4.8) Net of tax Net unrealized gains on derivative transactions $ (0.7) $ (0.7) Interest expense 0.1 0.1 Provision for income taxes $ (0.6) $ (0.6) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 1.8 $ 1.3 (1) Amortization of prior service credit (3.4) (1.1) (1) (1.6) 0.2 0.3 (0.1) Provision for income taxes $ (1.3) $ 0.1 Net of tax Total reclassifications for the period $ (4.3) $ (5.3) Net of tax (1) These AOCI components are included in the computation of net periodic pension cost. See Note 15 for additional information.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based Compensation Under the Assurant, Inc. 2017 Long-Term Equity Incentive Plan (the “ALTEIP”), as amended in May 2019, the Company is authorized to issue up to 1,588,797 new shares of the Company’s common stock to employees, officers and non-employee directors. Under the ALTEIP, the Company may grant awards based on shares of its common stock, including stock options, stock appreciation rights, restricted stock (including performance shares), unrestricted stock, restricted stock units (“RSUs”), performance share units (“PSUs”) and dividend equivalents. All share-based grants are awarded under the ALTEIP. Restricted Stock Units The following table shows a summary of RSU activity during the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 RSU compensation expense $ 6.6 $ 6.3 Income tax benefit (1.2) (1.1) RSU compensation expense, net of tax $ 5.4 $ 5.2 RSUs granted 168,595 228,412 Weighted average grant date fair value per unit $ 137.18 $ 89.58 Total fair value of vested RSUs $ 30.0 $ 8.9 As of March 31, 2021, there was $37.0 million of unrecognized compensation cost related to outstanding RSUs. That cost is expected to be recognized over a weighted-average period of 1.4 years. Performance Share Units The following table shows a summary of PSU activity during the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 PSU compensation expense $ 6.2 $ 4.8 Income tax benefit (0.6) (0.5) PSU compensation expense, net of tax $ 5.6 $ 4.3 PSUs granted 201,462 302,274 Weighted average grant date fair value per unit $ 147.32 $ 87.36 Total fair value of vested PSUs $ 22.5 $ 24.4 As of March 31, 2021, there was $42.3 million of unrecognized compensation cost related to outstanding PSUs. That cost is expected to be recognized over a weighted-average period of 1.2 years.

Equity Transactions

Equity Transactions	3 Months Ended
	Mar. 31, 2021
Class of Stock Disclosures [Abstract]
Equity Transactions	Equity Transactions Stock Repurchase During the three months ended March 31, 2021 and 2020, the Company repurchased 308,000 and 480,967 shares of the Company’s outstanding common stock at a cost of $41.5 million and $57.3 million, exclusive of commissions, respectively, leaving $745.0 million aggregate cost at purchase remaining unused under the existing repurchase authorizations as of March 31, 2021. The timing and the amount of future repurchases will depend on market conditions, the Company’s financial condition, results of operations and liquidity and other factors. Mandatory Convertible Preferred Stock (“MCPS”) In March 2018, the Company issued 2,875,000 shares of the MCPS, with a par value of $1.00 per share, at a public offering price of $100.00 per share. The net proceeds from the sale of the MCPS was $276.4 million after deducting the underwriting discounts and offering expenses. Each outstanding share of MCPS converted in March 2021 into 0.9405 of common shares, or 2,703,911 common shares in total plus an immaterial amount of cash in lieu of fractional shares. The Company used a portion of its treasury stock for the common shares, using the average cost method to account for the reissuance of such shares.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following table presents net income, the weighted average common shares used in calculating basic EPS and those used in calculating diluted EPS for each period presented below. Diluted EPS reflects the incremental common shares from: (1) common shares issuable upon vesting of PSUs and the purchase of shares under the Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method; and (2) common shares issuable upon the conversion of the MCPS using the if-converted method. Refer to Notes 12 and 13 for further information regarding potential common stock issuances. The outstanding RSUs have non-forfeitable rights to dividend equivalents and are therefore included in calculating basic and diluted EPS under the two-class method. Three Months Ended March 31, 2021 2020 Numerator Net income from continuing operations $ 148.5 $ 148.6 Less: Net loss (income) attributable to non-controlling interest 0.2 (1.1) Net income from continuing operations attributable to stockholders 148.7 147.5 Less: Preferred stock dividends (4.7) (4.7) Net income from continuing operations attributable to common stockholders 144.0 142.8 Less: Common stock dividends paid (38.2) (38.0) Undistributed earnings $ 105.8 $ 104.8 Net income from continuing operations attributable to common stockholders $ 144.0 $ 142.8 Add: Net income from discontinued operations 14.3 7.2 Net income attributable to common stockholders $ 158.3 $ 150.0 Denominator Weighted average common shares outstanding used in basic per common share calculations 59,192,880 60,602,911 Incremental common shares from: PSUs 367,274 322,692 ESPP — 5,148 MCPS 2,223,238 2,696,175 Weighted average common shares outstanding used in diluted per common share calculations 61,783,392 63,626,926 Earnings per common share - Basic Distributed earnings $ 0.64 $ 0.63 Undistributed earnings 1.79 1.73 Net income from continuing operations 2.43 2.36 Net income from discontinued operations 0.24 0.12 Net income attributable to common stockholders $ 2.67 $ 2.48 Earnings per common share - Diluted Distributed earnings $ 0.62 $ 0.60 Undistributed earnings 1.79 1.72 Net income from continuing operations 2.41 2.32 Net income from discontinued operations 0.23 0.11 Net income attributable to common stockholders $ 2.64 $ 2.43

Retirement and Other Employee B

Retirement and Other Employee Benefits	3 Months Ended
	Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Retirement and Other Employee Benefits	Retirement and Other Employee BenefitsThe Company and its subsidiaries participate in a non-contributory, qualified defined benefit pension plan (“Assurant Pension Plan”) covering substantially all employees prior to closing to new hires on January 1, 2014. The Company also has various non-contributory, non-qualified supplemental plans covering certain employees, including the Assurant Executive Pension Plan and the Assurant Supplemental Executive Retirement Plan. The qualified and non-qualified plans are referred to as “Pension Benefits” unless otherwise noted. In addition, the Company provides certain life and health care benefits (“Retirement Health Benefits”) for retired employees and their dependents. The Pension Benefits and Retirement Health Benefits (together, the “Plans”) were frozen on March 1, 2016. In February 2020, the Company amended the Retirement Health Benefits to terminate effective December 31, 2024 (the “Termination Date”). Benefits will be paid up to the Termination Date. The Retirement Health Benefits obligations were re-measured using a discount rate of 1.55%, selected based on a cash flow analysis using a bond yield curve as of February 29, 2020, and the fair market value of the Retirement Health Benefits assets as of February 29, 2020. The remeasurement resulted in a reduction to the Retirement Health Benefits obligations of $65.6 million and a corresponding prior service credit in AOCI, which will be reclassified from AOCI as it is amortized in the net periodic benefit cost over the remaining period until the Termination Date. The following tables present the components of net periodic benefit cost for the Plans for the three months ended March 31, 2021 and 2020: Qualified Pension Benefits Unfunded Non-qualified Retirement Health For the Three Months Ended March 31, For the Three Months Ended March 31, For the Three Months Ended March 31, 2021 2020 2021 2020 2021 2020 Interest cost $ 3.5 $ 5.1 $ 0.3 $ 0.5 $ — $ 0.4 Expected return on plan assets (6.9) (7.7) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.4) (1.1) Amortization of net loss (gain) 1.2 0.7 0.8 0.6 (0.1) — Net periodic benefit cost $ (2.2) $ (1.9) $ 1.1 $ 1.1 $ (3.9) $ (1.1)

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit In the normal course of business, letters of credit are issued primarily to support reinsurance arrangements in which the Company is the reinsurer. These letters of credit are supported by commitments under which the Company is required to indemnify the financial institution issuing the letter of credit if the letter of credit is drawn. The Company had $7.2 million and $7.6 million of letters of credit outstanding as of March 31, 2021 and December 31, 2020, respectively. Legal and Regulatory Matters The Company is involved in a variety of litigation and legal and regulatory proceedings relating to its current and past business operations and, from time to time, it may become involved in other such actions. The Company continues to defend itself vigorously in these proceedings. The Company has participated and may participate in settlements on terms that the Company considers reasonable. The Company has established an accrued liability for certain legal and regulatory proceedings. The possible loss or range of loss resulting from such litigation and regulatory proceedings, if any, in excess of the amounts accrued is inherently unpredictable and uncertain. Consequently, no estimate can be made of any possible loss or range of loss in excess of the accrual. Although the Company cannot predict the outcome of any pending legal or regulatory proceeding, or the potential losses, fines, penalties or equitable relief, if any, that may result, it is possible that such outcome could have a material adverse effect on the Company’s consolidated results of operations or cash flows for an individual reporting period. However, on the

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. The interim financial data as of March 31, 2021 and for the three months ended March 31, 2021 and 2020 is unaudited. In the opinion of management, the interim data includes all adjustments necessary for a fair statement of the results for the interim periods. The unaudited interim Consolidated Financial Statements include the accounts of the Company and all of its wholly owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current year presentation, including the impacts of held for sale and discontinued operations as further summarized in Note 4.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Simplifying the Accounting for Income Taxes : In December 2019, the Financial Accounting Standards Board (“FASB”) issued new guidance to simplify the accounting for income taxes by removing certain exceptions to the general principles and also simplify areas such as franchise taxes, step-up in tax basis goodwill, separate entity financial statements and interim recognition of enactment of tax laws or rate changes. The standard was adopted by the Company beginning on January 1, 2021 with no material impact on its financial position or results of operations. Not Yet Adopted Targeted improvements to the accounting for long-duration contracts : In August 2018, the FASB issued guidance that provides targeted improvements to the accounting for long-duration contracts. The guidance includes the following primary changes: assumptions supporting benefit reserves will no longer be locked-in but must be updated at least annually with the impact of changes to the liability reflected in earnings (except for discount rates); the discount rate assumptions will be based on the upper-medium grade (low credit risk) fixed-income instrument yield instead of the earnings rate of invested assets; the discount rate must be evaluated at each reporting date and the impact of changes to the liability estimate as a result of updating the discount rate assumption is required to be recognized in other comprehensive income; the provision for adverse deviation is eliminated; and premium deficiency testing is eliminated. Other noteworthy changes include the following: differing models for amortizing deferred acquisition costs will become uniform for all long-duration contracts based on a constant rate over the expected term of the related in-force contracts; all market risk benefits associated with deposit contracts must be reported at fair value with changes reflected in income except for changes related to credit risk which will be recognized in other comprehensive income; and disclosures will be expanded to include disaggregated roll forwards of the liability for future policy benefits, policyholder account balances, market risk benefits, separate account liabilities, and deferred acquisition costs, as well as information about significant inputs, judgments, assumptions and methods used in measurement. The guidance is effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. Early adoption is permitted. Generally, the amendments are applied retrospectively as of the beginning of the earliest period presented with two transition options available for changing the assumptions. The Company is evaluating the requirements of this guidance and the potential impact on the Company’s financial position and results of operations. Facilitation of the Effects of Reference Rate Reform on Financial Reporting: In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The relief is applicable only to legacy contracts if the amendments made to the agreements are solely for reference rate reform activities. The provisions must be applied consistently for all relevant transactions other than derivatives, which may be applied at a hedging relationship level. The guidance is effective upon issuance. The guidance on contract modifications is applied prospectively from any date beginning March 12, 2020. Unlike other topics, the provisions of this update are only available until December 31, 2022, when the reference rate replacement activity is expected to have been completed. As certain published LIBOR periods are expected to be discontinued after 2021, the Company is evaluating the provisions of this new accounting guidance and the impact to debt, investments and derivatives that have references to LIBOR and the subsequent transition to alternative reference rates. Improvements to Convertible Instruments and Contracts in an Entity’s Own Equity : In August 2020, the FASB issued guidance that simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument and more convertible preferred stock as a single equity instrument with no separate accounting for embedded conversion features. The guidance removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more contracts in an entity’s own equity to qualify for it. The guidance also simplifies the diluted earnings per common share (“EPS”) calculation in the areas of convertible instruments and instruments that qualify for the derivatives scope exception for contracts in an entity’s own equity to address accounting for the guidance changes to the classification, recognition and measurement. This guidance will be effective for the Company beginning January 1, 2022. Early adoption is permitted. The Company is evaluating the requirements of this guidance and the potential impact on its financial position and results of operations.
Business Held for Sale and Discontinued Operations	The Company reports a business as held for sale when management has received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the ensuing year and certain other specified criteria are met. A business classified as held for sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell, which is required to be remeasured each reporting period. If the carrying amount of the business exceeds its estimated fair value, which is based on the estimated sales price of the transaction, less costs to sell, a loss is recognized. Depreciation is not recorded on assets of a business classified as held for sale. The Company reports the results of operations of a business as discontinued operations if (i) the business is classified as held for sale; (ii) the business represents a strategic shift that will have a major impact on the Company’s operations and financial results; (iii) the operations and cash flows of the business have been or will be eliminated from the ongoing operations of the Company as a result of the disposal transaction and (iv) the Company will not have any significant continuing involvement in the operations of the business after the disposal transaction. The results of discontinued operations are reported in net income from discontinued operations in the consolidated statements of operations for all periods presented, commencing in the period in which the business is either disposed of or is classified as held for sale, including any gain or loss recognized on closing or adjustment of the carrying amount to fair value less costs to sell. Assets and liabilities related to a business classified as held for sale which also meets the criteria for discontinued operations are segregated in the consolidated balance sheets for the current and prior periods presented.

Business Held for Sale and Di_2

Business Held for Sale and Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Discontinued Operations	The following table presents the major classes of assets and liabilities held for sale included in the consolidated balance sheets. March 31, 2021 December 31, 2020 Assets Investments: Fixed maturity securities available for sale, at fair value $ 6,325.0 $ 6,633.5 Equity securities at fair value 111.0 113.9 Commercial mortgage loans on real estate, at amortized cost 606.1 616.0 Short-term investments 142.5 41.2 Other investments 15.1 52.0 Total investments 7,199.7 7,456.6 Cash and cash equivalents 20.3 21.0 Premiums and accounts receivable 7.3 7.5 Reinsurance recoverables 3,244.0 3,234.5 Accrued investment income 66.5 62.7 Deferred acquisition costs 651.0 185.5 Property and equipment, net 47.2 47.2 Value of business acquired 4.1 4.3 Other assets 21.3 22.6 Assets held in separate accounts 2,230.1 2,176.8 Total assets held for sale $ 13,491.5 $ 13,218.7 Liabilities Future policy benefits and expenses $ 8,806.0 $ 8,703.5 Unearned premiums 102.1 14.9 Claims and benefits payable 1,019.0 1,049.2 Commissions payable 10.3 9.4 Reinsurance balances payable 3.5 3.1 Accounts payable and other liabilities 194.2 154.4 Liabilities related to separate accounts 2,230.1 2,176.8 Total liabilities held for sale $ 12,365.2 $ 12,111.3 The following table summarizes the components of net income from discontinued operations included in the consolidated statements of operations: Three Months Ended March 31, 2021 2020 Revenues Net earned premiums $ 17.7 $ 18.3 Fees and other income 37.5 37.5 Net investment income 72.0 72.4 Net realized losses on investments (1.1) (11.3) Total revenues 126.1 116.9 Benefits, losses and expenses Policyholder benefits 74.0 72.0 Amortization of deferred acquisition costs and value of business acquired 19.2 18.9 Underwriting, general and administrative expenses 21.8 16.9 Total benefits, losses and expenses 115.0 107.8 Income from discontinued operations before income taxes 11.1 9.1 (Benefit) provision for income taxes (3.2) 1.9 Net income from discontinued operations $ 14.3 $ 7.2

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Financial Information by Segment	The following tables summarize selected financial information by segment: Three Months Ended March 31, 2021 Global Lifestyle Global Housing Corporate Consolidated Revenues Net earned premiums $ 1,648.7 $ 456.9 $ — $ 2,105.6 Fees and other income 213.6 36.1 0.2 249.9 Net investment income 50.8 19.4 6.1 76.3 Net realized gains on investments — — 0.8 0.8 Total revenues 1,913.1 512.4 7.1 2,432.6 Benefits, losses and expenses Policyholder benefits 327.4 201.3 — 528.7 Amortization of deferred acquisition costs and value of business acquired 889.2 57.5 — 946.7 Underwriting, general and administrative expenses 527.2 168.8 39.7 735.7 Interest expense — — 28.4 28.4 Total benefits, losses and expenses 1,743.8 427.6 68.1 2,239.5 Segment income (loss) from continuing operations before provision (benefit) for income tax 169.3 84.8 (61.0) 193.1 Provision (benefit) for income taxes 40.2 17.4 (13.0) 44.6 Segment net income (loss) from continuing operations $ 129.1 $ 67.4 $ (48.0) 148.5 Net income from discontinued operations 14.3 Net income 162.8 Less: Net loss attributable to non-controlling interests 0.2 Net income attributable to stockholders 163.0 Less: Preferred stock dividends (4.7) Net income attributable to common stockholders $ 158.3 As of March 31, 2021 Segment assets: $ 24,335.2 $ 3,892.2 $ 16,183.2 $ 44,410.6 Three Months Ended March 31, 2020 Global Lifestyle Global Housing Corporate Consolidated Revenues Net earned premiums $ 1,597.7 $ 467.8 $ — $ 2,065.5 Fees and other income 349.2 32.6 1.8 383.6 Net investment income 54.7 22.0 6.9 83.6 Net realized losses on investments — — (84.0) (84.0) Total revenues 2,001.6 522.4 (75.3) 2,448.7 Benefits, losses and expenses Policyholder benefits 336.2 198.7 0.3 535.2 Amortization of deferred acquisition costs and value of business acquired 838.4 56.9 — 895.3 Underwriting, general and administrative expenses 667.9 173.3 51.4 892.6 Interest expense — — 25.5 25.5 Total benefits, losses and expenses 1,842.5 428.9 77.2 2,348.6 Segment income (loss) from continuing operations before provision (benefit) for income taxes 159.1 93.5 (152.5) 100.1 Provision (benefit) for income taxes 38.2 19.3 (106.0) (48.5) Segment net income (loss) from continuing operations $ 120.9 $ 74.2 $ (46.5) 148.6 Net income from discontinued operations 7.2 Net income 155.8 Less: Net income attributable to non-controlling interest (1.1) Net income attributable to stockholders 154.7 Less: Preferred stock dividends (4.7) Net income attributable to common stockholders $ 150.0

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2021
Investments [Abstract]
Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI	The following tables show the cost or amortized cost, allowance for credit losses, gross unrealized gains and losses, and fair value of the Company’s fixed maturity securities as of the dates indicated: March 31, 2021 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 72.5 $ — $ 2.9 $ (0.4) $ 75.0 States, municipalities and political subdivisions 174.6 — 8.1 (2.0) 180.7 Foreign governments 422.0 — 13.6 (1.1) 434.5 Asset-backed 268.3 — 13.3 (0.4) 281.2 Commercial mortgage-backed 280.0 — 12.8 (2.9) 289.9 Residential mortgage-backed 629.4 — 37.6 (0.6) 666.4 U.S. corporate 3,273.8 (1.2) 271.3 (26.4) 3,517.5 Foreign corporate 1,086.2 — 56.5 (12.0) 1,130.7 Total fixed maturity securities $ 6,206.8 $ (1.2) $ 416.1 $ (45.8) $ 6,575.9 December 31, 2020 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 90.4 $ — $ 3.7 $ — $ 94.1 States, municipalities and political subdivisions 164.4 — 11.0 (0.1) 175.3 Foreign governments 442.4 — 27.4 (0.1) 469.7 Asset-backed 251.9 — 9.4 (0.8) 260.5 Commercial mortgage-backed 266.3 — 16.5 (1.4) 281.4 Residential mortgage-backed 685.8 — 49.0 (0.2) 734.6 U.S. corporate 3,315.6 (1.2) 380.6 (4.4) 3,690.6 Foreign corporate 1,029.0 — 80.6 (0.3) 1,109.3 Total fixed maturity securities $ 6,245.8 $ (1.2) $ 578.2 $ (7.3) $ 6,815.5
Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity	The cost or amortized cost and fair value of fixed maturity securities as of March 31, 2021 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. Cost or Fair Value Due in one year or less $ 359.0 $ 363.5 Due after one year through five years 2,047.5 2,170.5 Due after five years through ten years 1,730.5 1,848.2 Due after ten years 892.1 956.2 Total 5,029.1 5,338.4 Asset-backed 268.3 281.2 Commercial mortgage-backed 280.0 289.9 Residential mortgage-backed 629.4 666.4 Total $ 6,206.8 $ 6,575.9
Net Realized Gains (Losses), Including Other-Than-Temporary Impairments	The following table sets forth the net realized gains (losses), including impairment, recognized in the consolidated statements of operations for the periods indicated: Three Months Ended March 31, 2021 2020 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 3.0 $ 3.7 Equity securities (1) (1.7) (34.9) Commercial mortgage loans on real estate 0.3 (0.2) Other investments 0.2 0.9 Consolidated investment entities (2) — (48.2) Total net realized gains (losses) related to sales and other 1.8 (78.7) Net realized losses related to impairments: Fixed maturity securities — (1.1) Other investments (1) (1.0) (4.2) Total net realized losses related to impairments (1.0) (5.3) Total net realized gains (losses) $ 0.8 $ (84.0) (1) Three months ended March 31, 2021 and 2020 includes $2.1 million and $2.2 million, respectively, of net gains on equity investment holdings accounted for under the measurement alternative. The carrying value of equity investments accounted for under the measurement alternative was $103.3 million and $96.0 million as of March 31, 2021 and 2020, respectively. These investments are included within other investments on the consolidated balance sheets. For the three months ended March 31, 2021 and 2020, there were impairments of $1.0 million and $4.2 million, respectively. For the three months ended March 31, 2021 and 2020, the cumulative carry value fair value increases were $37.1 million and $26.8 million, respectively. For the three months ended March 31, 2021 and 2020, the cumulative impairment losses were $19.6 million and $5.6 million, respectively. (2) Consists of net realized losses from the change in fair value of the Company’s direct investment in collateralized loan obligations (“CLOs”).
Unrealized Gains on Equity Securities	The following table sets forth the portion of unrealized gains (losses) related to equity securities for the periods indicated: Three Months Ended March 31, 2021 2020 Net losses recognized on equity securities $ (1.7) $ (34.9) Less: Net realized gains related to sales of equity securities 0.9 — Total net unrealized losses on equity securities held $ (2.6) $ (34.9)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of March 31, 2021 and December 31, 2020 were as follows: March 31, 2021 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 17.9 $ (0.4) $ — $ — $ 17.9 $ (0.4) States, municipalities and political subdivisions 72.3 (2.0) — — 72.3 (2.0) Foreign governments 54.9 (1.1) — — 54.9 (1.1) Asset-backed 80.1 (0.2) 33.4 (0.2) 113.5 (0.4) Commercial mortgage-backed 72.1 (2.3) 2.9 (0.6) 75.0 (2.9) Residential mortgage-backed 36.7 (0.5) 3.1 (0.1) 39.8 (0.6) U.S. corporate 397.8 (23.8) 27.7 (2.6) 425.5 (26.4) Foreign corporate 259.0 (11.9) 3.1 (0.1) 262.1 (12.0) Total fixed maturity securities $ 990.8 $ (42.2) $ 70.2 $ (3.6) $ 1,061.0 $ (45.8) December 31, 2020 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: States, municipalities and political subdivisions $ 6.1 $ (0.1) $ — $ — $ 6.1 $ (0.1) Foreign governments 28.3 (0.1) — — 28.3 (0.1) Asset-backed 54.5 (0.2) 37.4 (0.6) 91.9 (0.8) Commercial mortgage-backed 28.2 (0.7) 3.3 (0.7) 31.5 (1.4) Residential mortgage-backed 23.9 (0.1) 1.5 (0.1) 25.4 (0.2) U.S. corporate 71.9 (2.9) 13.8 (1.5) 85.7 (4.4) Foreign corporate 30.1 (0.3) — — 30.1 (0.3) Total fixed maturity securities $ 243.0 $ (4.4) $ 56.0 $ (2.9) $ 299.0 $ (7.3)
Credit Quality Indicators	The following table presents the amortized cost basis of commercial mortgage loans, excluding the allowance for credit losses, by origination year for certain key credit quality indicators at March 31, 2021 and December 31, 2020. March 31, 2021 Origination Year 2021 2020 2019 2018 2017 Prior Total % of Total Loan to value 70% and less $ 5.5 $ 2.9 $ — $ — $ 4.1 $ 115.4 127.9 85.8 % 71% to 80% $ 4.6 $ 2.6 $ — $ 4.8 $ — $ — 12.0 8.0 % 81% to 95% $ — $ — $ — $ — $ — $ 2.1 2.1 1.4 % Greater than 95% $ — $ — $ — $ — $ 5.9 $ 1.2 7.1 4.8 % Total $ 10.1 $ 5.5 $ — $ 4.8 $ 10.0 $ 118.7 149.1 100.0 % March 31, 2021 Origination Year 2021 2020 2019 2018 2017 Prior Total % of Total Debt service coverage ratios (2): Greater than 2.0 $ 5.8 $ 5.5 $ — $ — $ 4.1 $ 81.8 $ 97.2 65.3 % 1.5 to 2.0 2.9 — — 4.8 — 17.7 25.4 17.0 % 1.0 to 1.5 1.4 — — — — 14.6 16.0 10.7 % Less than 1.0 — — — — 5.9 4.6 10.5 7.0 % Total $ 10.1 $ 5.5 $ — $ 4.8 $ 10.0 $ 118.7 $ 149.1 100.0 % December 31, 2020 Origination Year 2020 2019 2018 2017 2016 Prior Total % of Total Loan to value 70% and less $ 2.9 $ — $ — $ 4.1 $ 29.0 $ 87.1 $ 123.1 88.0 % 71% to 80% 2.6 — 4.8 — — — 7.4 5.3 % 81% to 95% — — — — — 2.2 2.2 1.6 % Greater than 95% — — — 6.0 — 1.2 7.2 5.1 % Total $ 5.5 $ — $ 4.8 $ 10.1 $ 29.0 $ 90.5 $ 139.9 100.0 % December 31, 2020 Origination Year 2020 2019 2018 2017 2016 Prior Total % of Total Debt service coverage ratios (2): Greater than 2.0 $ 5.5 $ — $ — $ 4.1 $ 26.4 $ 53.3 $ 89.3 63.9 % 1.5 to 2.0 — — 4.8 — 2.6 17.5 24.9 17.8 % 1.0 to 1.5 — — — — — 15.0 15.0 10.7 % Less than 1.0 — — — 6.0 — 4.7 10.7 7.6 % Total $ 5.5 $ — $ 4.8 $ 10.1 $ 29.0 $ 90.5 $ 139.9 100.0 % (1) Loan-to-value ratio derived from current loan balance divided by the fair value of the property. The fair value of the underlying commercial properties is updated at least annually.

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities	The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020. The amounts presented below for short-term investments, other investments, cash equivalents, other assets, assets held in and liabilities related to separate accounts and other liabilities differ from the amounts presented in the consolidated balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. Other investments are comprised of investments in the Assurant Investment Plan (“AIP”), the American Security Insurance Company Investment Plan, the Assurant Deferred Compensation Plan, a modified coinsurance arrangement and other derivatives. Other liabilities are comprised of investments in the AIP, contingent considerations related to business combinations and other derivatives. The fair value amount and the majority of the associated levels presented for other investments and assets and liabilities held in separate accounts are received directly from third parties. March 31, 2021 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 75.0 $ — $ 75.0 $ — States, municipalities and political subdivisions 180.7 — 180.7 — Foreign governments 434.5 0.5 433.6 0.4 Asset-backed 281.2 — 279.7 1.5 Commercial mortgage-backed 289.9 — 281.6 8.3 Residential mortgage-backed 666.4 — 666.4 — U.S. corporate 3,517.5 — 3,506.3 11.2 Foreign corporate 1,130.7 — 1,126.9 3.8 Equity securities: Mutual funds 42.1 42.1 — — Common stocks 15.8 13.8 0.6 1.4 Non-redeemable preferred stocks 235.3 — 234.2 1.1 Short-term investments 116.0 87.8 (2) 28.2 — Other investments 231.4 73.0 (1) 158.3 (3) 0.1 Cash equivalents 872.5 831.5 (2) 41.0 (3) — Other assets 0.1 — 0.1 (4) — Assets held in separate accounts 11.2 6.6 (1) 4.6 (3) — Total financial assets $ 8,100.3 $ 1,055.3 $ 7,017.2 $ 27.8 Financial Liabilities Other liabilities $ 75.8 $ 73.0 (1) $ — $ 2.8 (5) Liabilities related to separate accounts 11.2 6.6 (1) 4.6 (3) — Total financial liabilities $ 87.0 $ 79.6 $ 4.6 $ 2.8 December 31, 2020 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 94.1 $ — $ 94.1 $ — States, municipalities and political subdivisions 175.3 — 175.3 — Foreign governments 469.7 0.5 468.8 0.4 Asset-backed 260.5 — 260.5 — Commercial mortgage-backed 281.4 — 272.7 8.7 Residential mortgage-backed 734.6 — 734.6 — U.S. corporate 3,690.6 — 3,678.6 12.0 Foreign corporate 1,109.3 — 1,105.4 3.9 Equity securities: Mutual funds 42.3 42.3 — — Common stocks 15.2 13.3 0.7 1.2 Non-redeemable preferred stocks 232.7 — 231.6 1.1 Short-term investments 253.5 202.0 (2) 51.5 — Other investments 241.3 72.9 (1) 168.3 (3) 0.1 Cash equivalents 1,558.6 1,536.6 (2) 22.0 (3) — Assets held in separate accounts 11.4 6.7 (1) 4.7 (3) — Total financial assets $ 9,170.5 $ 1,874.3 $ 7,268.8 $ 27.4 Financial Liabilities Other liabilities $ 76.1 $ 72.9 (1) $ 0.5 (4) $ 2.7 (5) Liabilities related to separate accounts 11.4 6.7 (1) 4.7 (3) — Total financial liabilities $ 87.5 $ 79.6 $ 5.2 $ 2.7 (1) Primarily includes mutual funds and related obligations. (2) Primarily includes money market funds. (3) Primarily includes fixed maturity securities and related obligations. (4) Primarily includes derivatives. (5) Includes contingent consideration liabilities and other derivatives.
Carrying Value and Fair Value of the Financial Instruments that are Not recognized or are Not Carried at Fair Value	The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets as of the dates indicated: March 31, 2021 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 147.9 $ 160.7 $ — $ — $ 160.7 Other investments 50.4 50.4 14.3 — 36.1 Other assets 21.9 21.9 — — 21.9 Total financial assets $ 220.2 $ 233.0 $ 14.3 $ — $ 218.7 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 69.6 $ 81.5 $ — $ — $ 81.5 Funds withheld under reinsurance 359.8 359.8 359.8 — — Debt 2,203.7 2,455.0 — 2,455.0 — Total financial liabilities $ 2,633.1 $ 2,896.3 $ 359.8 $ 2,455.0 $ 81.5 December 31, 2020 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 138.3 $ 198.3 $ — $ — $ 198.3 Other investments 52.1 52.1 14.4 — 37.7 Other assets 23.3 23.3 — — 23.3 Total financial assets $ 213.7 $ 273.7 $ 14.4 $ — $ 259.3 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 70.6 $ 85.4 $ — $ — $ 85.4 Funds withheld under reinsurance 358.6 358.6 358.6 — — Debt 2,252.9 2,540.0 — 2,540.0 — Total financial liabilities $ 2,682.1 $ 2,984.0 $ 358.6 $ 2,540.0 $ 85.4

Reserves (Tables)

Reserves (Tables)	3 Months Ended
	Mar. 31, 2021
Insurance Loss Reserves [Abstract]
Roll Forward of Claims and Benefits Payable	The following table provides a roll forward of the Company’s beginning and ending claims and benefits payable balances. Claims and benefits payable is the liability for unpaid loss and loss adjustment expenses and is comprised of case and incurred but not reported (“IBNR”) reserves. Since unpaid loss and loss adjustment expenses are estimates, the Company’s actual losses incurred may be more or less than the Company’s previously developed estimates, which is referred to as either unfavorable or favorable development, respectively. The best estimate of ultimate loss and loss adjustment expense is generally selected from a blend of methods that are applied consistently each period. There have been no significant changes in the methodologies and assumptions utilized in estimating the liability for unpaid loss and loss adjustment expenses for any of the periods presented. For the Three Months Ended March 31, 2021 2020 Claims and benefits payable, at beginning of period $ 1,610.3 $ 1,613.1 Less: Reinsurance ceded and other (849.4) (855.1) Net claims and benefits payable, at beginning of period 760.9 758.0 Incurred losses and loss adjustment expenses related to: Current year 574.9 580.2 Prior years (46.2) (45.0) Total incurred losses and loss adjustment expenses 528.7 535.2 Paid losses and loss adjustment expenses related to: Current year 235.8 277.8 Prior years 268.3 268.9 Total paid losses and loss adjustment expenses 504.1 546.7 Net claims and benefits payable, at end of period 785.5 746.5 Plus: Reinsurance ceded and other (1) 792.5 857.8 Claims and benefits payable, at end of period (1) $ 1,578.0 $ 1,604.3

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Debt	The following table shows the principal amount and carrying value of the Company’s outstanding debt, less unamortized discount and issuance costs as applicable, as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Principal Amount Carrying Value Principal Amount Carrying Value Floating Rate Senior Notes due March 2021 (1) $ — $ — $ 50.0 $ 50.0 4.00% Senior Notes due March 2023 350.0 349.0 350.0 348.9 4.20% Senior Notes due September 2023 300.0 298.5 300.0 298.4 4.90% Senior Notes due March 2028 300.0 297.2 300.0 297.2 3.70% Senior Notes due February 2030 350.0 347.1 350.0 347.0 6.75% Senior Notes due February 2034 275.0 272.3 275.0 272.3 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 (2) 400.0 395.6 400.0 395.4 5.25% Subordinated Notes due January 2061 250.0 244.0 250.0 243.7 Total Debt $ 2,203.7 $ 2,252.9 (1) The outstanding aggregate principal amount was repaid in January 2021. Prior to repayment, these senior notes bore floating interest at a rate equal to three-month LIBOR plus 1.25% per annum.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Accumulated Other Comprehensive Income, Net of Tax	The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated: Three Months Ended March 31, 2021 Foreign Net unrealized Net unrealized gains on derivative transactions Credit related impairment Non-credit related impairment Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2020 $ (295.6) $ 1,080.3 $ 14.7 $ 1.2 $ 16.1 $ (106.9) $ 709.8 Change in accumulated other comprehensive income (loss) before reclassifications 7.2 (207.1) — — (0.8) (0.3) (201.0) Amounts reclassified from accumulated other comprehensive income (loss) — (2.4) (0.6) — — (1.3) (4.3) Net current-period other comprehensive income (loss) 7.2 (209.5) (0.6) — (0.8) (1.6) (205.3) Balance at March 31, 2021 $ (288.4) $ 870.8 $ 14.1 $ 1.2 $ 15.3 $ (108.5) $ 504.5 Three Months Ended March 31, 2020 Foreign Net unrealized Net unrealized gains on derivative transactions Credit related impairment Non-credit related impairment Unamortized net (losses) gains on Pension Plans (1) Accumulated Balance at December 31, 2019 $ (358.9) $ 856.5 $ 17.1 $ — $ 15.5 $ (118.7) $ 411.5 Change in accumulated other comprehensive income (loss) before reclassifications (66.7) (297.3) — — (2.7) 48.9 (317.8) Amounts reclassified from accumulated other comprehensive income (loss) — (4.8) (0.6) — — 0.1 (5.3) Net current-period other comprehensive income (loss) (66.7) (302.1) (0.6) — (2.7) 49.0 (323.1) Balance at March 31, 2020 $ (425.6) $ 554.4 $ 16.5 $ — $ 12.8 $ (69.7) $ 88.4
Reclassification out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications out of accumulated other comprehensive income (“AOCI”) for the periods indicated: Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Three Months Ended March 31, 2021 2020 Net unrealized (gains) losses on investments $ (3.1) $ (6.1) Net realized gains (losses) on investments 0.7 1.3 Provision for income taxes $ (2.4) $ (4.8) Net of tax Net unrealized gains on derivative transactions $ (0.7) $ (0.7) Interest expense 0.1 0.1 Provision for income taxes $ (0.6) $ (0.6) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 1.8 $ 1.3 (1) Amortization of prior service credit (3.4) (1.1) (1) (1.6) 0.2 0.3 (0.1) Provision for income taxes $ (1.3) $ 0.1 Net of tax Total reclassifications for the period $ (4.3) $ (5.3) Net of tax (1) These AOCI components are included in the computation of net periodic pension cost. See Note 15 for additional information.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of Stock Based Compensation Activity	The following table shows a summary of RSU activity during the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 RSU compensation expense $ 6.6 $ 6.3 Income tax benefit (1.2) (1.1) RSU compensation expense, net of tax $ 5.4 $ 5.2 RSUs granted 168,595 228,412 Weighted average grant date fair value per unit $ 137.18 $ 89.58 Total fair value of vested RSUs $ 30.0 $ 8.9 The following table shows a summary of PSU activity during the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 PSU compensation expense $ 6.2 $ 4.8 Income tax benefit (0.6) (0.5) PSU compensation expense, net of tax $ 5.6 $ 4.3 PSUs granted 201,462 302,274 Weighted average grant date fair value per unit $ 147.32 $ 87.36 Total fair value of vested PSUs $ 22.5 $ 24.4

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS	The following table presents net income, the weighted average common shares used in calculating basic EPS and those used in calculating diluted EPS for each period presented below. Diluted EPS reflects the incremental common shares from: (1) common shares issuable upon vesting of PSUs and the purchase of shares under the Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method; and (2) common shares issuable upon the conversion of the MCPS using the if-converted method. Refer to Notes 12 and 13 for further information regarding potential common stock issuances. The outstanding RSUs have non-forfeitable rights to dividend equivalents and are therefore included in calculating basic and diluted EPS under the two-class method. Three Months Ended March 31, 2021 2020 Numerator Net income from continuing operations $ 148.5 $ 148.6 Less: Net loss (income) attributable to non-controlling interest 0.2 (1.1) Net income from continuing operations attributable to stockholders 148.7 147.5 Less: Preferred stock dividends (4.7) (4.7) Net income from continuing operations attributable to common stockholders 144.0 142.8 Less: Common stock dividends paid (38.2) (38.0) Undistributed earnings $ 105.8 $ 104.8 Net income from continuing operations attributable to common stockholders $ 144.0 $ 142.8 Add: Net income from discontinued operations 14.3 7.2 Net income attributable to common stockholders $ 158.3 $ 150.0 Denominator Weighted average common shares outstanding used in basic per common share calculations 59,192,880 60,602,911 Incremental common shares from: PSUs 367,274 322,692 ESPP — 5,148 MCPS 2,223,238 2,696,175 Weighted average common shares outstanding used in diluted per common share calculations 61,783,392 63,626,926 Earnings per common share - Basic Distributed earnings $ 0.64 $ 0.63 Undistributed earnings 1.79 1.73 Net income from continuing operations 2.43 2.36 Net income from discontinued operations 0.24 0.12 Net income attributable to common stockholders $ 2.67 $ 2.48 Earnings per common share - Diluted Distributed earnings $ 0.62 $ 0.60 Undistributed earnings 1.79 1.72 Net income from continuing operations 2.41 2.32 Net income from discontinued operations 0.23 0.11 Net income attributable to common stockholders $ 2.64 $ 2.43

Retirement and Other Employee_2

Retirement and Other Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Components of Net Periodic Benefit Cost	The following tables present the components of net periodic benefit cost for the Plans for the three months ended March 31, 2021 and 2020: Qualified Pension Benefits Unfunded Non-qualified Retirement Health For the Three Months Ended March 31, For the Three Months Ended March 31, For the Three Months Ended March 31, 2021 2020 2021 2020 2021 2020 Interest cost $ 3.5 $ 5.1 $ 0.3 $ 0.5 $ — $ 0.4 Expected return on plan assets (6.9) (7.7) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.4) (1.1) Amortization of net loss (gain) 1.2 0.7 0.8 0.6 (0.1) — Net periodic benefit cost $ (2.2) $ (1.9) $ 1.1 $ 1.1 $ (3.9) $ (1.1)

Nature of Operations (Details)

Nature of Operations (Details)	3 Months Ended
	Mar. 31, 2021segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2

Business Held for Sale and Di_3

Business Held for Sale and Discontinued Operations - Narrative (Details) $ in Millions	Sep. 30, 2021USD ($)
Global Preneed | Discontinued Operations, Held-for-sale | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received from sale of discontinued operation	$ 1,250

Business Held for Sale and Di_4

Business Held for Sale and Discontinued Operations - Schedule of Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Investments:
Fixed maturity securities, fair value	$ 6,575.9	$ 6,815.5
Equity securities at fair value	293.2	290.2
Commercial mortgage loans on real estate, at amortized cost	147.9	138.3
Short-term investments	145.3	292
Other investments	707.7	686.8
Total investments	7,870	8,222.8
Cash and cash equivalents	1,651.3	2,207.6	$ 1,996.1
Premiums and accounts receivable, net	1,924.2	1,548.9
Reinsurance recoverables	6,528.1	6,605.4
Accrued investment income	73.3	67
Deferred acquisition costs	7,649.7	7,388
Property and equipment, net	469.1	446.1
Value of business acquired	988	1,152.2
Other assets	495.4	496.2
Assets held in separate accounts	11.3	11.5
Total assets held for sale	44,410.6	44,649.9
Liabilities
Future policy benefits and expenses	1,356.5	1,358.5
Unearned premiums	17,301	17,293.1
Claims and benefits payable	1,578	1,610.3	$ 1,604.3	$ 1,613.1
Commissions payable	599	699.1
Reinsurance balances payable	422.2	359.3
Accounts payable and other liabilities	2,388.3	2,640.5
Liabilities related to separate accounts	11.3	11.5
Total liabilities held for sale	38,585	38,695.1
Global Preneed | Discontinued Operations, Held-for-sale
Investments:
Fixed maturity securities, fair value	6,325	6,633.5
Equity securities at fair value	111	113.9
Commercial mortgage loans on real estate, at amortized cost	606.1	616
Short-term investments	142.5	41.2
Other investments	15.1	52
Total investments	7,199.7	7,456.6
Cash and cash equivalents	20.3	21
Premiums and accounts receivable, net	7.3	7.5
Reinsurance recoverables	3,244	3,234.5
Accrued investment income	66.5	62.7
Deferred acquisition costs	651	185.5
Property and equipment, net	47.2	47.2
Value of business acquired	4.1	4.3
Other assets	21.3	22.6
Assets held in separate accounts	2,230.1	2,176.8
Total assets held for sale	13,491.5	13,218.7
Liabilities
Future policy benefits and expenses	8,806	8,703.5
Unearned premiums	102.1	14.9
Claims and benefits payable	1,019	1,049.2
Commissions payable	10.3	9.4
Reinsurance balances payable	3.5	3.1
Accounts payable and other liabilities	194.2	154.4
Liabilities related to separate accounts	2,230.1	2,176.8
Total liabilities held for sale	$ 12,365.2	$ 12,111.3

Business Held for Sale and Di_5

Business Held for Sale and Discontinued Operations - Schedule of Income From Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Net earned premiums	$ 2,105.6	$ 2,065.5
Fees and other income	249.9	383.6
Net investment income	76.3	83.6
Net realized losses on investments	0.8	(84)
Total revenues	2,432.6	2,448.7
Benefits, losses and expenses
Policyholder benefits	528.7	535.2
Amortization of deferred acquisition costs and value of business acquired	946.7	895.3
Underwriting, general and administrative expenses	735.7	892.6
Total benefits, losses and expenses	2,239.5	2,348.6
Net income from discontinued operations (Note 4)	14.3	7.2
Global Preneed | Discontinued Operations, Held-for-sale
Revenues
Net earned premiums	17.7	18.3
Fees and other income	37.5	37.5
Net investment income	72	72.4
Net realized losses on investments	(1.1)	(11.3)
Total revenues	126.1	116.9
Benefits, losses and expenses
Policyholder benefits	74	72
Amortization of deferred acquisition costs and value of business acquired	19.2	18.9
Underwriting, general and administrative expenses	21.8	16.9
Total benefits, losses and expenses	115	107.8
Income from discontinued operations before income taxes	11.1	9.1
(Benefit) provision for income taxes	(3.2)	1.9
Net income from discontinued operations (Note 4)	$ 14.3	$ 7.2

Segment Information - Financial

Segment Information - Financial Information by Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)reportable_segment	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment	3
Revenues
Net earned premiums	$ 2,105.6	$ 2,065.5
Fees and other income	249.9	383.6
Net investment income	76.3	83.6
Net realized gains on investments	0.8	(84)
Total revenues	2,432.6	2,448.7
Benefits, losses and expenses
Policyholder benefits	528.7	535.2
Amortization of deferred acquisition costs and value of business acquired	946.7	895.3
Underwriting, general and administrative expenses	735.7	892.6
Interest expense	28.4	25.5
Total benefits, losses and expenses	2,239.5	2,348.6
Segment income (loss) from continuing operations before provision (benefit) for income taxes	193.1	100.1
Provision (benefit) for income taxes	44.6	(48.5)
Net income from continuing operations	148.5	148.6
Net income from discontinued operations (Note 4)	14.3	7.2
Net income	162.8	155.8
Less: Net loss (income) attributable to non-controlling interests	0.2	(1.1)
Net income attributable to stockholders	163	154.7
Less: Preferred stock dividends	(4.7)	(4.7)
Net income attributable to common stockholders	158.3	150
Segment assets	44,410.6		$ 44,649.9
Global Lifestyle
Revenues
Net earned premiums	1,648.7	1,597.7
Fees and other income	213.6	349.2
Net investment income	50.8	54.7
Net realized gains on investments	0	0
Total revenues	1,913.1	2,001.6
Benefits, losses and expenses
Policyholder benefits	327.4	336.2
Amortization of deferred acquisition costs and value of business acquired	889.2	838.4
Underwriting, general and administrative expenses	527.2	667.9
Interest expense	0	0
Total benefits, losses and expenses	1,743.8	1,842.5
Segment income (loss) from continuing operations before provision (benefit) for income taxes	169.3	159.1
Provision (benefit) for income taxes	40.2	38.2
Net income from continuing operations	129.1	120.9
Segment assets	24,335.2
Global Housing
Revenues
Net earned premiums	456.9	467.8
Fees and other income	36.1	32.6
Net investment income	19.4	22
Net realized gains on investments	0	0
Total revenues	512.4	522.4
Benefits, losses and expenses
Policyholder benefits	201.3	198.7
Amortization of deferred acquisition costs and value of business acquired	57.5	56.9
Underwriting, general and administrative expenses	168.8	173.3
Interest expense	0	0
Total benefits, losses and expenses	427.6	428.9
Segment income (loss) from continuing operations before provision (benefit) for income taxes	84.8	93.5
Provision (benefit) for income taxes	17.4	19.3
Net income from continuing operations	67.4	74.2
Segment assets	3,892.2
Corporate and Other
Revenues
Net earned premiums	0	0
Fees and other income	0.2	1.8
Net investment income	6.1	6.9
Net realized gains on investments	0.8	(84)
Total revenues	7.1	(75.3)
Benefits, losses and expenses
Policyholder benefits	0	0.3
Amortization of deferred acquisition costs and value of business acquired	0	0
Underwriting, general and administrative expenses	39.7	51.4
Interest expense	28.4	25.5
Total benefits, losses and expenses	68.1	77.2
Segment income (loss) from continuing operations before provision (benefit) for income taxes	(61)	(152.5)
Provision (benefit) for income taxes	(13)	(106)
Net income from continuing operations	(48)	$ (46.5)
Segment assets	$ 16,183.2

Contract Revenues - Narrative (

Contract Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Global Lifestyle
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	$ 164.9	$ 299.1
Global Housing
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	24.5	22.1
Service contracts and sales
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	219.9		$ 257.9
Unearned revenue from contracts with customers	91.6		89.8
Contract with customer, liability, unearned revenue	11.7	$ 20.2
Deferred upfront commissions and other costs	$ 10.9		$ 13.8

Investments - Amortized Cost, G

Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	$ 6,206.8
Fixed maturity securities, fair value	6,575.9	$ 6,815.5
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	6,206.8	6,245.8
Fixed maturity securities available for sale, allowances for credit losses	(1.2)	(1.2)
Fixed maturity securities, gross unrealized gains	416.1	578.2
Fixed maturity securities, gross unrealized losses	(45.8)	(7.3)
Fixed maturity securities, fair value	6,575.9	6,815.5
Fixed maturity securities | U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	72.5	90.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	2.9	3.7
Fixed maturity securities, gross unrealized losses	(0.4)	0
Fixed maturity securities, fair value	75	94.1
Fixed maturity securities | States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	174.6	164.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	8.1	11
Fixed maturity securities, gross unrealized losses	(2)	(0.1)
Fixed maturity securities, fair value	180.7	175.3
Fixed maturity securities | Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	422	442.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	13.6	27.4
Fixed maturity securities, gross unrealized losses	(1.1)	(0.1)
Fixed maturity securities, fair value	434.5	469.7
Fixed maturity securities | Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	268.3	251.9
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	13.3	9.4
Fixed maturity securities, gross unrealized losses	(0.4)	(0.8)
Fixed maturity securities, fair value	281.2	260.5
Fixed maturity securities | Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	280	266.3
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	12.8	16.5
Fixed maturity securities, gross unrealized losses	(2.9)	(1.4)
Fixed maturity securities, fair value	289.9	281.4
Fixed maturity securities | Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	629.4	685.8
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	37.6	49
Fixed maturity securities, gross unrealized losses	(0.6)	(0.2)
Fixed maturity securities, fair value	666.4	734.6
Fixed maturity securities | U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	3,273.8	3,315.6
Fixed maturity securities available for sale, allowances for credit losses	(1.2)	(1.2)
Fixed maturity securities, gross unrealized gains	271.3	380.6
Fixed maturity securities, gross unrealized losses	(26.4)	(4.4)
Fixed maturity securities, fair value	3,517.5	3,690.6
Fixed maturity securities | Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	1,086.2	1,029
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	56.5	80.6
Fixed maturity securities, gross unrealized losses	(12)	(0.3)
Fixed maturity securities, fair value	$ 1,130.7	$ 1,109.3

Investments - Narrative (Detail

Investments - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)investmentstate	Dec. 31, 2020USD ($)investmentstate
Investment [Line Items]
Investment in securities	$ 6,575.9	$ 6,815.5
Percentage of securities representing gross unrealized losses	4.00%	2.00%
Percentage of gross unrealized losses in a continuous loss position less than twelve months	92.00%	60.00%
Individual securities comprising total gross unrealized losses | investment	619	180
Percentage of residential mortgage-backed holdings exposure to sub-prime mortgage collateral	53.00%
Minimum
Investment [Line Items]
Total	$ 0.2	$ 0.1
Maximum
Investment [Line Items]
Total	$ 9.9	$ 9.9
States, municipalities and political subdivisions
Investment [Line Items]
Number of individual states exceeding overall investment portfolio exposure | state	0	0
Maximum individual state exposure	0.40%	0.40%
Advance refunded or escrowed-to-maturity securities	$ 39.5	$ 39.6
Percentage of revenue securities	61.00%	60.00%
Europe | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Investment in securities	$ 617.2	$ 589.5
Unrealized gain (loss) on investments	$ 21.6	$ 41.8
Geographic Concentration Risk | Investments | Canada | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	25.00%	26.00%
Geographic Concentration Risk | Investments | Brazil | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	21.00%	24.00%
Geographic Concentration Risk | Investments | Mexico | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	16.00%	16.00%
Geographic Concentration Risk | Investments | United Kingdom | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	6.00%	6.00%
Geographic Concentration Risk | Investments | Other Countries (more than 3%) | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	10.00%	8.00%
Financial Services Sector | Investment Sector Concentration Risk | Investments | Europe | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	34.00%	29.00%
Fixed maturity securities
Investment [Line Items]
Investment in securities	$ 6,575.9	$ 6,815.5
Fixed maturity securities, gross unrealized losses	45.8	7.3
Fixed maturity securities, gross unrealized gains	416.1	578.2
Fixed maturity securities | States, municipalities and political subdivisions
Investment [Line Items]
Investment in securities	180.7	175.3
Fixed maturity securities, gross unrealized losses	2	0.1
Fixed maturity securities, gross unrealized gains	8.1	11
Fixed maturity securities | Energy Sector | Corporate debt securities
Investment [Line Items]
Investment in securities	290	319.4
Fixed maturity securities, gross unrealized losses	$ 19.5
Fixed maturity securities, gross unrealized gains		$ 23
Internal Investment Grade | Fixed maturity securities | Energy Sector | Corporate debt securities
Investment [Line Items]
Percentage of investments held	82.00%	81.00%

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Cost or Amortized Cost
Due in one year or less, cost or amortized cost	$ 359
Due after one year through five years, cost or amortized cost	2,047.5
Due after five years through ten years, cost or amortized cost	1,730.5
Due after ten years, cost or amortized cost	892.1
Total, cost or amortized cost	5,029.1
Fixed maturity securities, cost or amortized cost	6,206.8
Fair Value
Due in one year or less, fair value	363.5
Due after one year through five years, fair value	2,170.5
Due after five years through ten years, fair value	1,848.2
Due after ten years, fair value	956.2
Total, fair value	5,338.4
Fixed maturity securities, fair value	6,575.9	$ 6,815.5
Commercial mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	280
Fair Value
Fair value	289.9
Residential mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	629.4
Fair Value
Fair value	666.4
Asset-backed
Cost or Amortized Cost
Cost or amortized cost	268.3
Fair Value
Fair value	$ 281.2

Investments - Net Realized Gain

Investments - Net Realized Gains (Losses), Including Other-Than-Temporary Impairments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	$ 1.8	$ (78.7)
Net realized losses related to impairments:
Net realized losses related to impairments	(1)	(5.3)
Total net realized gains (losses)	0.8	(84)
Gains on equity investment holdings accounted for under alternative measurement	2.1	2.2
Impairment of equity investment	1		$ 4.2
Equity securities, carry value adjustment upwards	37.1		26.8
Impairment loss, adjustment	19.6		5.6
Fixed maturity securities
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	3	3.7
Net realized losses related to impairments:
Net realized losses related to impairments	0	(1.1)
Equity securities
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	(1.7)	(34.9)
Net realized losses related to impairments:
Equity investment holdings accounted for under the measurement alternative	103.3		$ 96
Commercial mortgage loans on real estate
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	0.3	(0.2)
Other investments
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	0.2	0.9
Net realized losses related to impairments:
Other investments	(1)	(4.2)
Consolidated investment entities
Net realized gains (losses) related to sales and other:
Net realized gains (losses) on investments	$ 0	$ (48.2)

Investments - Unrealized Gains

Investments - Unrealized Gains on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Net losses recognized on equity securities	$ (1.7)	$ (34.9)
Less: Net realized gains related to sales of equity securities	0.9	0
Total net unrealized losses on equity securities held	$ (2.6)	$ (34.9)

Investments - Investment Catego

Investments - Investment Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities (Details) - Fixed maturity securities - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	$ 990.8	$ 243
Fixed maturity securities, less than 12 months, unrealized losses	(42.2)	(4.4)
Fixed maturity securities, 12 months or more, fair value	70.2	56
Fixed maturity securities, 12 months or more, unrealized losses	(3.6)	(2.9)
Fixed maturity securities, total, fair value	1,061	299
Fixed maturity securities, unrealized losses	(45.8)	(7.3)
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	17.9
Fixed maturity securities, less than 12 months, unrealized losses	(0.4)
Fixed maturity securities, 12 months or more, fair value	0
Fixed maturity securities, 12 months or more, unrealized losses	0
Fixed maturity securities, total, fair value	17.9
Fixed maturity securities, unrealized losses	(0.4)
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	72.3	6.1
Fixed maturity securities, less than 12 months, unrealized losses	(2)	(0.1)
Fixed maturity securities, 12 months or more, fair value	0	0
Fixed maturity securities, 12 months or more, unrealized losses	0	0
Fixed maturity securities, total, fair value	72.3	6.1
Fixed maturity securities, unrealized losses	(2)	(0.1)
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	54.9	28.3
Fixed maturity securities, less than 12 months, unrealized losses	(1.1)	(0.1)
Fixed maturity securities, 12 months or more, fair value	0	0
Fixed maturity securities, 12 months or more, unrealized losses	0	0
Fixed maturity securities, total, fair value	54.9	28.3
Fixed maturity securities, unrealized losses	(1.1)	(0.1)
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	80.1	54.5
Fixed maturity securities, less than 12 months, unrealized losses	(0.2)	(0.2)
Fixed maturity securities, 12 months or more, fair value	33.4	37.4
Fixed maturity securities, 12 months or more, unrealized losses	(0.2)	(0.6)
Fixed maturity securities, total, fair value	113.5	91.9
Fixed maturity securities, unrealized losses	(0.4)	(0.8)
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	72.1	28.2
Fixed maturity securities, less than 12 months, unrealized losses	(2.3)	(0.7)
Fixed maturity securities, 12 months or more, fair value	2.9	3.3
Fixed maturity securities, 12 months or more, unrealized losses	(0.6)	(0.7)
Fixed maturity securities, total, fair value	75	31.5
Fixed maturity securities, unrealized losses	(2.9)	(1.4)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	36.7	23.9
Fixed maturity securities, less than 12 months, unrealized losses	(0.5)	(0.1)
Fixed maturity securities, 12 months or more, fair value	3.1	1.5
Fixed maturity securities, 12 months or more, unrealized losses	(0.1)	(0.1)
Fixed maturity securities, total, fair value	39.8	25.4
Fixed maturity securities, unrealized losses	(0.6)	(0.2)
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	397.8	71.9
Fixed maturity securities, less than 12 months, unrealized losses	(23.8)	(2.9)
Fixed maturity securities, 12 months or more, fair value	27.7	13.8
Fixed maturity securities, 12 months or more, unrealized losses	(2.6)	(1.5)
Fixed maturity securities, total, fair value	425.5	85.7
Fixed maturity securities, unrealized losses	(26.4)	(4.4)
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	259	30.1
Fixed maturity securities, less than 12 months, unrealized losses	(11.9)	(0.3)
Fixed maturity securities, 12 months or more, fair value	3.1	0
Fixed maturity securities, 12 months or more, unrealized losses	(0.1)	0
Fixed maturity securities, total, fair value	262.1	30.1
Fixed maturity securities, unrealized losses	$ (12)	$ (0.3)

Investments - Credit Quality In

Investments - Credit Quality Indicators (Details) - Commercial Portfolio Segment $ in Millions	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Greater than 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 5.8	$ 5.5
Financing receivable, originated year one	5.5	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	4.1
Financing receivable, originated year four	4.1	26.4
Prior	81.8	53.3
Total	$ 97.2	$ 89.3
% of Total	0.653	0.639
1.5 to 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 2.9	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	4.8
Financing receivable, originated year three	4.8	0
Financing receivable, originated year four	0	2.6
Prior	17.7	17.5
Total	$ 25.4	$ 24.9
% of Total	0.170	0.178
1.0 to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 1.4	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	14.6	15
Total	$ 16	$ 15
% of Total	0.107	0.107
Less than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	6
Financing receivable, originated year four	5.9	0
Prior	4.6	4.7
Total	$ 10.5	$ 10.7
% of Total	0.070	0.076
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 10.1	$ 5.5
Financing receivable, originated year one	5.5	0
Financing receivable, originated year two	0	4.8
Financing receivable, originated year three	4.8	10.1
Financing receivable, originated year four	10	29
Prior	118.7	90.5
Total	$ 149.1	$ 139.9
% of Total	1	1
70% and less
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 5.5	$ 2.9
Financing receivable, originated year one	2.9	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	4.1
Financing receivable, originated year four	4.1	29
Prior	115.4	87.1
Total	$ 127.9	$ 123.1
% of Total	0.858	0.880
71% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 4.6	$ 2.6
Financing receivable, originated year one	2.6	0
Financing receivable, originated year two	0	4.8
Financing receivable, originated year three	4.8	0
Financing receivable, originated year four	0	0
Prior	0	0
Total	$ 12	$ 7.4
% of Total	0.080	0.053
81% to 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	2.1	2.2
Total	$ 2.1	$ 2.2
% of Total	0.014	0.016
Greater than 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	6
Financing receivable, originated year four	5.9	0
Prior	1.2	1.2
Total	$ 7.1	$ 7.2
% of Total	0.048	0.051
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 10.1	$ 5.5
Financing receivable, originated year one	5.5	0
Financing receivable, originated year two	0	4.8
Financing receivable, originated year three	4.8	10.1
Financing receivable, originated year four	10	29
Prior	118.7	90.5
Total	$ 149.1	$ 139.9
% of Total	1	1

Fair Value Disclosures - Fair V

Fair Value Disclosures - Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 8,100.3	$ 9,170.5
Other liabilities	75.8	76.1
Liabilities related to separate accounts	11.2	11.4
Total financial liabilities	87	87.5
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,055.3	1,874.3
Other liabilities	73	72.9
Liabilities related to separate accounts	6.6	6.7
Total financial liabilities	79.6	79.6
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	7,017.2	7,268.8
Other liabilities	0	0.5
Liabilities related to separate accounts	4.6	4.7
Total financial liabilities	4.6	5.2
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	27.8	27.4
Other liabilities	2.8	2.7
Liabilities related to separate accounts	0	0
Total financial liabilities	2.8	2.7
U.S. government and government agencies and authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	75	94.1
U.S. government and government agencies and authorities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. government and government agencies and authorities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	75	94.1
U.S. government and government agencies and authorities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	180.7	175.3
States, municipalities and political subdivisions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
States, municipalities and political subdivisions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	180.7	175.3
States, municipalities and political subdivisions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Foreign governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	434.5	469.7
Foreign governments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.5	0.5
Foreign governments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	433.6	468.8
Foreign governments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.4	0.4
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	281.2	260.5
Asset-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Asset-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	279.7	260.5
Asset-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1.5	0
Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	289.9	281.4
Commercial mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Commercial mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	281.6	272.7
Commercial mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	8.3	8.7
Residential mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	666.4	734.6
Residential mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Residential mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	666.4	734.6
Residential mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,517.5	3,690.6
U.S. corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,506.3	3,678.6
U.S. corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	11.2	12
Foreign corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,130.7	1,109.3
Foreign corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Foreign corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,126.9	1,105.4
Foreign corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3.8	3.9
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	42.1	42.3
Mutual funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	42.1	42.3
Mutual funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Mutual funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	15.8	15.2
Common Stock | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	13.8	13.3
Common Stock | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.6	0.7
Common Stock | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1.4	1.2
Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	235.3	232.7
Non-redeemable preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Non-redeemable preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	234.2	231.6
Non-redeemable preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1.1	1.1
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	116	253.5
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	87.8	202
Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	28.2	51.5
Short-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	231.4	241.3
Other investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	73	72.9
Other investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	158.3	168.3
Other investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.1	0.1
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	872.5	1,558.6
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	831.5	1,536.6
Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	41	22
Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.1
Other assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0
Other assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.1
Other assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0
Assets held in separate accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	11.2	11.4
Assets held in separate accounts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	6.6	6.7
Assets held in separate accounts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	4.6	4.7
Assets held in separate accounts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 0	$ 0

Fair Value Disclosures - Carryi

Fair Value Disclosures - Carrying Value and Fair Value of the Financial Instruments that are Not Recognized or are Not Carried at Fair Value (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	$ 8,100.3	$ 9,170.5
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	1,055.3	1,874.3
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	7,017.2	7,268.8
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	27.8	27.4
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	147.9	138.3
Other investments	50.4	52.1
Other assets	21.9	23.3
Total financial assets	220.2	213.7
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	69.6	70.6
Funds withheld under reinsurance	359.8	358.6
Debt	2,203.7	2,252.9
Total financial liabilities	2,633.1	2,682.1
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	160.7	198.3
Other investments	50.4	52.1
Other assets	21.9	23.3
Total financial assets	233	273.7
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	81.5	85.4
Funds withheld under reinsurance	359.8	358.6
Debt	2,455	2,540
Total financial liabilities	2,896.3	2,984
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	0	0
Other investments	14.3	14.4
Other assets	0	0
Total financial assets	14.3	14.4
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	359.8	358.6
Debt	0	0
Total financial liabilities	359.8	358.6
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	0	0
Other investments	0	0
Other assets	0	0
Total financial assets	0	0
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	0	0
Debt	2,455	2,540
Total financial liabilities	2,455	2,540
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	160.7	198.3
Other investments	36.1	37.7
Other assets	21.9	23.3
Total financial assets	218.7	259.3
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	81.5	85.4
Funds withheld under reinsurance	0	0
Debt	0	0
Total financial liabilities	$ 81.5	$ 85.4

Reserves - Roll Forward of Clai

Reserves - Roll Forward of Claims and Benefits Payable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Claims and benefits payable	$ 1,610.3	$ 1,604.3	$ 1,578	$ 1,604.3
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Claims and benefits payable, at beginning of period	1,610.3	1,613.1
Less: Reinsurance ceded and other	(849.4)	(855.1)
Net claims and benefits payable, at beginning of period	760.9	758
Incurred losses and loss adjustment expenses related to:
Current year	574.9	580.2
Prior years	(46.2)	(45)
Total incurred losses and loss adjustment expenses	528.7	535.2
Paid losses and loss adjustment expenses related to:
Current year	235.8	277.8
Prior years	268.3	268.9
Total paid losses and loss adjustment expenses	504.1	546.7
Net claims and benefits payable, at end of period	785.5	746.5
Plus: Reinsurance ceded and other	792.5	857.8
Claims and benefits payable, at end of period	$ 1,578	$ 1,604.3
Ceded to U.S. Government | Not Rated
Paid losses and loss adjustment expenses related to:
Reinsurance recoverables			$ 66.1	$ 72.8

Reserves - Narrative (Details)

Reserves - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development	$ 46.2	$ 45
Global Lifestyle
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development	30.6	29.7
Global Housing
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development	12.6	9.9
Corporate and Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development	$ 3	$ 5.4

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying Value	$ 2,203,700,000	$ 2,252,900,000
Senior Notes | Floating Rate Senior Notes due March 2021
Debt Instrument [Line Items]
Principal Amount	0	50,000,000
Carrying Value	$ 0	50,000,000
Senior Notes | Floating Rate Senior Notes due March 2021 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate, basis spread	1.25%
Senior Notes | 4.00% Senior Notes due March 2023
Debt Instrument [Line Items]
Principal Amount	$ 350,000,000	350,000,000
Carrying Value	$ 349,000,000	348,900,000
Interest rate	4.00%
Senior Notes | 4.20% Senior Notes due September 2023
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000	300,000,000
Carrying Value	$ 298,500,000	298,400,000
Interest rate	4.20%
Senior Notes | 4.90% Senior Notes due March 2028
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000	300,000,000
Carrying Value	$ 297,200,000	297,200,000
Interest rate	4.90%
Senior Notes | 3.70% Senior Notes due February 2030
Debt Instrument [Line Items]
Principal Amount	$ 350,000,000	350,000,000
Carrying Value	$ 347,100,000	347,000,000
Interest rate	3.70%
Senior Notes | 6.75% Senior Notes due February 2034
Debt Instrument [Line Items]
Principal Amount	$ 275,000,000	275,000,000
Carrying Value	$ 272,300,000	272,300,000
Interest rate	6.75%
5.25% Subordinated Notes due 2061 | 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048
Debt Instrument [Line Items]
Principal Amount	$ 400,000,000	400,000,000
Carrying Value	$ 395,600,000	395,400,000
Interest rate	7.00%
5.25% Subordinated Notes due 2061 | 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate, basis spread	4.135%
5.25% Subordinated Notes due 2061 | 5.25% Subordinated Notes due January 2061
Debt Instrument [Line Items]
Principal Amount	$ 250,000,000	250,000,000
Carrying Value	$ 244,000,000	$ 243,700,000
Interest rate	5.25%

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowed from credit facility		$ 2,203,700,000		$ 2,252,900,000
Amortization of gain on swaptions		700,000	$ 700,000
Senior Notes | 4.20% Senior Notes due September 2023
Debt Instrument [Line Items]
Borrowed from credit facility		$ 298,500,000		298,400,000
Interest rate		4.20%
Senior Notes | 4.90% Senior Notes due March 2028
Debt Instrument [Line Items]
Borrowed from credit facility		$ 297,200,000		$ 297,200,000
Interest rate		4.90%
Letter of Credit
Debt Instrument [Line Items]
Line of credit		$ 4,500,000
Revolving Credit Facility | Revolving Credit Facility 2017
Debt Instrument [Line Items]
Borrowed from credit facility		0
Revolving Credit Facility | JPMorgan Chase Bank NA And Bank of America NA | Revolving Credit Facility 2017
Debt Instrument [Line Items]
Credit facility borrowing capacity		450,000,000
Senior revolving credit facility		575,000,000
Sublimit for letters of credit issued		50,000,000
Line of credit facility, remaining borrowing capacity		445,500,000
Derivative
Debt Instrument [Line Items]
Deferred gain from effective cash flow hedges	$ 26,700,000
Interest Rate Derivatives
Debt Instrument [Line Items]
Deferred gain from effective cash flow hedges		$ 17,900,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 5,951.4
Change in accumulated other comprehensive income (loss) before reclassifications	(201)	$ (317.8)
Amounts reclassified from accumulated other comprehensive income (loss)	(4.3)	(5.3)
Total other comprehensive loss	(205.3)	(323.1)
Ending balance	5,822.2
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	709.8	411.5
Total other comprehensive loss	(205.3)	(323.1)
Ending balance	504.5	88.4
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(295.6)	(358.9)
Change in accumulated other comprehensive income (loss) before reclassifications	7.2	(66.7)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive loss	7.2	(66.7)
Ending balance	(288.4)	(425.6)
Net unrealized gains on securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1,080.3	856.5
Change in accumulated other comprehensive income (loss) before reclassifications	(207.1)	(297.3)
Amounts reclassified from accumulated other comprehensive income (loss)	(2.4)	(4.8)
Total other comprehensive loss	(209.5)	(302.1)
Ending balance	870.8	554.4
Net unrealized gains on derivative transactions
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	14.7	17.1
Change in accumulated other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.6)	(0.6)
Total other comprehensive loss	(0.6)	(0.6)
Ending balance	14.1	16.5
Credit Related Impairments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1.2	0
Change in accumulated other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive loss	0	0
Ending balance	1.2	0
Non-credit related impairment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	16.1	15.5
Change in accumulated other comprehensive income (loss) before reclassifications	(0.8)	(2.7)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive loss	(0.8)	(2.7)
Ending balance	15.3	12.8
Unamortized net (losses) on Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(106.9)	(118.7)
Change in accumulated other comprehensive income (loss) before reclassifications	(0.3)	48.9
Amounts reclassified from accumulated other comprehensive income (loss)	(1.3)	0.1
Total other comprehensive loss	(1.6)	49
Ending balance	$ (108.5)	$ (69.7)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Reclassification 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) on investments	$ (0.8)	$ 84
Provision for income taxes	44.6	(48.5)
Net of tax	(162.8)	(155.8)
Interest expense	28.4	25.5
Total reclassifications for the period, net of tax	(4.3)	(5.3)
Net unrealized (gains) losses on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(2.4)	(4.8)
Net unrealized gains on derivative transactions
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(0.6)	(0.6)
Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(1.3)	0.1
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(4.3)	(5.3)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized (gains) losses on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	(3.1)	(6.1)
Provision for income taxes	0.7	1.3
Net of tax	(2.4)	(4.8)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains on derivative transactions
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	0.1	0.1
Net of tax	(0.6)	(0.6)
Interest expense	(0.7)	(0.7)
Reclassification out of Accumulated Other Comprehensive Income | Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.6)	0.2
Provision for income taxes	0.3	(0.1)
Total reclassifications for the period, net of tax	(1.3)	0.1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.8	1.3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (3.4)	$ (1.1)

Stock Based Compensation - Long

Stock Based Compensation - Long-Term Equity Incentive Plans (Details)	May 31, 2019shares
Long-Term Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's common stock authorized to employees (in shares) (up to)	1,588,797

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Stock Units (Details) - Long-Term Equity Incentive Plan - Restricted Stock Units - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6.6	$ 6.3
Income tax benefit	(1.2)	(1.1)
Compensation expense, net of tax	$ 5.4	$ 5.2
RSUs granted (in shares)	168,595	228,412
Weighted average grant date fair value per unit (in dollars per share)	$ 137.18	$ 89.58
Total fair value of vested RSUs	$ 30	$ 8.9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized compensation cost	$ 37
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)	1 year 4 months 24 days

Stock Based Compensation - Perf

Stock Based Compensation - Performance Stock Units (Details) - Long-Term Equity Incentive Plan - Performance Share Units - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6.2	$ 4.8
Income tax benefit	(0.6)	(0.5)
Compensation expense, net of tax	$ 5.6	$ 4.3
PSUs granted (in shares)	201,462	302,274
Weighted average grant date fair value per unit (in dollars per share)	$ 147.32	$ 87.36
Total fair value of vested PSUs	$ 22.5	$ 24.4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized compensation cost	$ 42.3
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)	1 year 2 months 12 days

Equity Transactions - Narrative

Equity Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Stock repurchased in period (in shares)			308,000	480,967
Stock repurchased in period			$ 41.5	$ 57.3
Amount remaining under total repurchase authorization	$ 745		745
Preferred stock dividends			$ 4.7	4.7
MCPS
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	0	2,875,000	0		2,875,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1	$ 1		$ 1
Public offering price (in dollars per share)		$ 100
Issuance of mandatory convertible preferred stock, net of issuance costs		$ 276.4
Stock conversion ratio (in shares)	0.9405		0.9405
Number of shares converted (in shares)	2,703,911
Share interest rate			6.50%		6.50%
Liquidation price (in dollars per share)	$ 100		$ 100
Preferred stock dividends			$ 4.7	$ 4.7

Earnings Per Common Share - Net

Earnings Per Common Share - Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Net income from continuing operations	$ 148.5	$ 148.6
Less: Net loss (income) attributable to non-controlling interest	0.2	(1.1)
Net income from continuing operations attributable to stockholders	148.7	147.5
Less: Preferred stock dividends	(4.7)	(4.7)
Net income from continuing operations attributable to common stockholders	144	142.8
Less: Common stock dividends paid	(38.2)	(38)
Undistributed earnings	105.8	104.8
Add: Net income from discontinued operations	14.3	7.2
Net income attributable to common stockholders	$ 158.3	$ 150
Denominator
Weighted average common shares outstanding used in basic per common share calculations (in shares)	59,192,880	60,602,911
Incremental common shares from:
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	61,783,392	63,626,926
Basic
Distributed earnings (in dollars per share)	$ 0.64	$ 0.63
Undistributed earnings (in dollars per share)	1.79	1.73
Net income from continuing operations (in dollars per share)	2.43	2.36
Net income from discontinued operations (in dollars per share)	0.24	0.12
Net income attributable to common stockholders (in dollars per share)	2.67	2.48
Diluted
Distributed earnings (in dollars per share)	0.62	0.60
Undistributed earning (in dollars per share)	1.79	1.72
Net income from continuing operations (in dollars per share)	2.41	2.32
Net income from discontinued operations (in dollars per share)	0.23	0.11
Net income attributable to common stockholders (in dollars per share)	$ 2.64	$ 2.43
PSUs
Incremental common shares from:
Incremental common shares (in shares)	367,274	322,692
ESPP
Incremental common shares from:
Incremental common shares (in shares)	0	5,148
MCPS
Incremental common shares from:
Mandatory convertible preferred stock (in shares)	2,223,238	2,696,175

Earnings Per Common Share - Nar

Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from computation of diluted EPS (in shares)	18,373	0

Retirement and Other Employee_3

Retirement and Other Employee Benefits - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Feb. 29, 2020
Defined Benefit Plan Disclosure [Line Items]
Qualified pension benefits plan funded status	$ 45,800,000	$ 43,200,000
Funded status percentage	106.00%	105.00%
Cash contribution to qualified pension benefits plan	$ 0
Cash expected contribution to plan over remainder of fiscal year	$ 0
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percentage)			1.55%
Reduction in obligations		$ 65,600,000

Retirement and Other Employee_4

Retirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan | Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 3.5	$ 5.1
Expected return on plan assets	(6.9)	(7.7)
Amortization of prior service credit	0	0
Amortization of net loss (gain)	1.2	0.7
Net periodic benefit cost	(2.2)	(1.9)
Pension Plan | Unfunded Nonqualified  Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.3	0.5
Expected return on plan assets	0	0
Amortization of prior service credit	0	0
Amortization of net loss (gain)	0.8	0.6
Net periodic benefit cost	1.1	1.1
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0.4
Expected return on plan assets	(0.4)	(0.4)
Amortization of prior service credit	(3.4)	(1.1)
Amortization of net loss (gain)	(0.1)	0
Net periodic benefit cost	$ (3.9)	$ (1.1)

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 7.2	$ 7.6