Assurant (AIZ) 10-Q 8 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 02, 2019
Entity Listings [Line Items]
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Document Quarterly Report	true
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 Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		61,130,900
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Central Index Key	0001267238
Common Stock
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	AIZ
Security Exchange Name	NYSE
Convertible Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	6.50% Series D Mandatory Convertible Preferred Stock, $1.00 Par Value
Trading Symbol	AIZP
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost - $11,107.7 and $10,834.0 at June 30, 2019 and December 31, 2018, respectively)		$ 12,228.8	$ 11,257.1
Equity securities at fair value		392.2	378.8
Commercial mortgage loans on real estate, at amortized cost		783.1	759.6
Short-term investments		357.5	373.2
Other investments		668.1	635.2
Total investments		14,429.7	13,403.9
Cash and cash equivalents		1,490.4	1,254
Premiums and accounts receivable, net		1,745.7	1,643.5
Reinsurance recoverables		9,162.6	9,166
Accrued investment income		126.9	125.5
Deferred acquisition costs		5,767.6	5,103
Property and equipment, at cost less accumulated depreciation		419.2	392.5
Goodwill		2,338	2,321.8
Value of business acquired		2,554.7	3,157.8
Other intangible assets, net		564.1	622.4
Other assets		622.6	603.8
Assets held in separate accounts		1,831.3	1,609.7
Assets of consolidated investment entities	[1]	2,086.7	1,685.4
Total assets		43,139.5	41,089.3
Liabilities
Future policy benefits and expenses		9,445.9	9,240.9
Unearned premiums		15,934.6	15,648
Claims and benefits payable		2,722.2	2,813.7
Commissions payable		447.8	338.6
Reinsurance balances payable		321.8	330.9
Funds held under reinsurance		308	272
Accounts payable and other liabilities		2,598.5	2,240.5
Debt		2,007.3	2,006
Liabilities related to separate accounts		1,831.3	1,609.7
Liabilities of consolidated investment entities	[1]	1,761.8	1,455.1
Total liabilities		37,379.2	35,955.4
Commitments and contingencies (Note 17)
Stockholders’ equity
6.50% Series D mandatory convertible preferred stock, par value $1.00 per share, 2,875,000 shares authorized, issued and outstanding at June 30, 2019 and December 31, 2018		2.9	2.9
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 161,489,702 and 161,153,454 shares issued and 61,207,965 and 61,908,979 shares outstanding at June 30, 2019 and December 31, 2018, respectively		1.6	1.6
Additional paid-in capital		4,509.2	4,495.6
Retained earnings		5,980.9	5,759.7
Accumulated other comprehensive income (loss)		328.7	(155.4)
Treasury stock, at cost; 100,259,737 and 99,244,475 shares at June 30, 2019 and December 31, 2018, respectively		(5,093.1)	(4,992.4)
Total Assurant, Inc. stockholders’ equity		5,730.2	5,112
Non-controlling interests		30.1	21.9
Total equity		5,760.3	5,133.9
Total liabilities and equity		$ 43,139.5	$ 41,089.3
[1]	The following table presents information on assets and liabilities related to consolidated investment entities as of June 30, 2019 and December 31, 2018. June 30, 2019 December 31, 2018 (in millions) Assets Cash and cash equivalents $ 84.8 $ 62.6 Investments, at fair value 1,977.1 1,576.2 Other receivables 24.8 46.6 Total assets $ 2,086.7 $ 1,685.4 Liabilities Collateralized loan obligation notes, at fair value 1,616.5 1,316.7 Other liabilities 145.3 138.4 Total liabilities $ 1,761.8 $ 1,455.1

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents		$ 84.8	$ 62.6
Investments, at fair value		1,977.1	1,576.2
Other receivables		24.8	46.6
Total assets	[1]	2,086.7	1,685.4
Liabilities
Collateralized loan obligation notes, at fair value		1,616.5	1,316.7
Other liabilities		145.3	138.4
Total liabilities	[1]	1,761.8	1,455.1
Fixed maturity securities available for sale, amortized cost		$ 11,107.7	$ 10,834
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		161,489,702	161,153,454
Common stock, shares outstanding (in shares)		61,207,965	61,908,979
Preferred stock, par value (in dollars per share)		$ 1	$ 1
Preferred stock, shares authorized (in shares)		2,875,000	2,875,000
Preferred stock, shares issued (in shares)		2,875,000	2,875,000
Preferred stock, shares outstanding (in shares)		2,875,000	2,875,000
Treasury stock, at cost (in shares)		100,259,737	99,244,475
Preferred Stock
Liabilities
Share interest rate		6.50%
Preferred stock, par value (in dollars per share)		$ 1
[1]	The following table presents information on assets and liabilities related to consolidated investment entities as of June 30, 2019 and December 31, 2018. June 30, 2019 December 31, 2018 (in millions) Assets Cash and cash equivalents $ 84.8 $ 62.6 Investments, at fair value 1,977.1 1,576.2 Other receivables 24.8 46.6 Total assets $ 2,086.7 $ 1,685.4 Liabilities Collateralized loan obligation notes, at fair value 1,616.5 1,316.7 Other liabilities 145.3 138.4 Total liabilities $ 1,761.8 $ 1,455.1

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net earned premiums	$ 2,032.7	$ 1,338.3	$ 3,937.1	$ 2,463.2
Fees and other income	336.1	354.2	664.4	718.7
Net investment income	154.2	135.6	320.5	265.8
Net realized gains (losses) on investments, excluding other-than-temporary impairment losses	18.4	(11.4)	47.5	(10.9)
Other-than-temporary impairment losses recognized in earnings	(0.6)	0	(0.9)	0
Amortization of deferred gains on disposal of businesses	4.7	15	12.5	33.5
Total revenues	2,545.5	1,831.7	4,981.1	3,470.3
Benefits, losses and expenses
Policyholder benefits	687	490.6	1,301.7	905.2
Amortization of deferred acquisition costs and value of business acquired	815.8	463.2	1,593.1	809.6
Underwriting, general and administrative expenses	832.9	773.6	1,633	1,493.2
Interest expense	26.5	26	53	47.5
Total benefits, losses and expenses	2,362.2	1,753.4	4,580.8	3,255.5
Income before provision for income taxes	183.3	78.3	400.3	214.8
Provision for income taxes	40.7	11.3	89.1	41.8
Net income	142.6	67	311.2	173
Less: Net loss (income) attributable to non-controlling interests	1.5	0	(1.4)	0
Net income attributable to stockholders	144.1	67	309.8	173
Less: Preferred stock dividends	(4.6)	(4.8)	(9.3)	(4.8)
Net income attributable to common stockholders	$ 139.5	$ 62.2	$ 300.5	$ 168.2
Earnings Per Common Share
Basic (in dollars per share)	$ 2.24	$ 1.09	$ 4.82	$ 3.05
Diluted (in dollars per share)	$ 2.21	$ 1.09	$ 4.73	$ 3.02
Share Data
Weighted average common shares outstanding used in basic per common share calculations (in shares)	62,222,090	57,060,313	62,407,429	55,125,584
Plus: Dilutive securities (in shares)	3,066,357	204,095	3,153,501	2,147,844
Weighted average common shares used in diluted earnings per common share calculations (in shares)	65,288,447	57,264,408	65,560,930	57,273,428

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 142.6	$ 67	$ 311.2	$ 173
Other comprehensive income (loss):
Change in unrealized gains on securities, net of taxes of $(60.0), $28.2, $(129.0) and $76.0 for the three and six months ended June 30, 2019 and 2018, respectively	228.5	(105.9)	477.4	(281.1)
Change in unrealized gains on derivative transactions, net of taxes of $0.1, $0.2, $0.3 and $(5.4) for the three and six months ended June 30, 2019 and 2018, respectively	(2.9)	(0.2)	(3.2)	20.9
Change in other-than-temporary impairment losses, net of taxes of $(0.2), $0.4, $(0.1) and $1.3 for the three and six months ended June 30, 2019 and 2018, respectively	0.7	(1.4)	0.5	(4.9)
Change in foreign currency translation, net of taxes of $(0.8,) $1.0, $(1.4) and $1.5 for the three and six months ended June 30, 2019 and 2018, respectively	(1.2)	(83.1)	9	(73.9)
Amortization of pension and postretirement unrecognized net periodic benefit cost, net of taxes of $(0.1), $(0.3), $(0.1) and $(0.3) for the three and six months ended June 30, 2019 and 2018, respectively	0.2	1	0.4	1
Total other comprehensive income (loss)	225.3	(189.6)	484.1	(338)
Total comprehensive income (loss)	367.9	(122.6)	795.3	(165)
Less: Comprehensive loss (income) attributable to non-controlling interests	1.5	0	(1.4)	0
Total comprehensive income (loss) attributable to stockholders	$ 369.4	$ (122.6)	$ 793.9	$ (165)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Change in unrealized gains on securities, tax	$ (60)	$ 28.2	$ (129)	$ 76
Change in unrealized gains on derivative transactions, tax	0.1	0.2	0.3	(5.4)
Change in other-than-temporary impairment gains, tax	(0.2)	0.4	(0.1)	1.3
Change in foreign currency transaction, tax	(0.8)	1	(1.4)	1.5
Amortization of pension and postretirement unrecognized net periodic benefit cost and change in funded status, tax	$ (0.1)	$ (0.3)	$ (0.1)	$ (0.3)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' 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	Preferred Stock	Preferred StockPreferred Stock	Preferred StockAdditional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principles, net of taxes	$ 7.5				$ 41.4	$ (33.9)
Beginning balance at Dec. 31, 2017	4,281.5	$ 0	$ 1.5	$ 3,197.9	5,697.3	234	$ (4,860.1)	$ 10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(8.8)			(8.8)
Stock plan compensation expense	21.7			21.7
Common stock dividends	(60.6)				(60.6)
Net income	173				173
Issuance of stock	975.5		0.1	975.4					$ 276.4	$ 2.9	$ 273.5
Preferred stock dividends	(4.8)				(4.8)
Change in equity of non-controlling interests	9.5							9.5
Other comprehensive loss	(338)					(338)
Ending balance at Jun. 30, 2018	5,332.9	2.9	1.6	4,459.7	5,846.3	(137.9)	(4,860.1)	20.4
Beginning balance at Mar. 31, 2018	4,501	2.9	1.5	3,478.8	5,815	51.7	(4,860.1)	11.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(6.6)			(6.6)
Stock plan compensation expense	12.1			12.1
Common stock dividends	(30.9)				(30.9)
Net income	67				67
Issuance of stock	975.5		0.1	975.4
Preferred stock dividends	(4.8)				(4.8)
Change in equity of non-controlling interests	9.2							9.2
Other comprehensive loss	(189.6)					(189.6)
Ending balance at Jun. 30, 2018	5,332.9	2.9	1.6	4,459.7	5,846.3	(137.9)	(4,860.1)	20.4
Beginning balance at Dec. 31, 2018	5,133.9	2.9	1.6	4,495.6	5,759.7	(155.4)	(4,992.4)	21.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(12.1)			(12.1)
Stock plan compensation expense	25.7			25.7
Common stock dividends	(75.7)				(75.7)
Acquisition of common stock	(100.7)						(100.7)
Net income	311.2				309.8			1.4
Preferred stock dividends	(9.3)				(9.3)
Change in equity of non-controlling interests	3.2				(3.6)			6.8
Other comprehensive loss	484.1					484.1
Ending balance at Jun. 30, 2019	5,760.3	2.9	1.6	4,509.2	5,980.9	328.7	(5,093.1)	30.1
Beginning balance at Mar. 31, 2019	5,471.7	2.9	1.6	4,496	5,879.7	103.4	(5,043)	31.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(1)			(1)
Stock plan compensation expense	14.2			14.2
Common stock dividends	(38.3)				(38.3)
Acquisition of common stock	(50.1)						(50.1)
Net income	142.6				144.1			(1.5)
Preferred stock dividends	(4.6)				(4.6)
Change in equity of non-controlling interests	0.5							0.5
Other comprehensive loss	225.3					225.3
Ending balance at Jun. 30, 2019	$ 5,760.3	$ 2.9	$ 1.6	$ 4,509.2	$ 5,980.9	$ 328.7	$ (5,093.1)	$ 30.1

Consolidated Statement of Sto_2

Consolidated Statement of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Common stock dividends (usd per share)	$ 0.60	$ 0.56	$ 1.20	$ 1.12
Preferred stock dividends (usd per share)	$ 1.63	$ 1.68	$ 3.25	$ 1.68

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Net income attributable to stockholders		$ 309.8	$ 173
Noncash revenues, expenses, gains and losses included in income:
Deferred tax expense		53.6	24.7
Amortization of deferred gains on disposal of businesses		(12.5)	(33.5)
Depreciation and amortization		60.1	54.9
Net realized (gains) losses on investments		(46.6)	10.9
Loss on business classified as held for sale		0	34.4
Stock based compensation expense		25.7	21.7
Other intangible asset impairment		14.6	0
Changes in operating assets and liabilities:
Change in insurance policy reserves and expenses		501	(434)
Change in premiums and accounts receivable		(99.4)	(39.6)
Change in reinsurance recoverable		85.1	644.8
Change in reinsurance balance payable		(12.7)	(3.4)
Change in funds withheld under reinsurance		34.4	(31.2)
Change in deferred acquisition costs and value of business acquired		(438.6)	(206.1)
Change in accounts payable		194.3	(285.1)
Change in other assets and other liabilities		12.7	103.4
Change in taxes payable		30.1	103.2
Other		14.1	34.2
Net cash provided by operating activities		725.7	172.3
Sales of:
Fixed maturity securities available for sale		1,262.3	1,465.8
Equity securities		52.5	57.2
Other invested assets		22.1	35.6
Maturities, calls, prepayments, and scheduled redemption of:
Fixed maturity securities available for sale		295.9	377.1
Commercial mortgage loans on real estate		32.2	78.3
Purchases of:
Fixed maturity securities available for sale		(1,731.7)	(1,646.8)
Equity securities		(43.8)	(39.4)
Commercial mortgage loans on real estate		(52.3)	(131.6)
Other invested assets		(24.9)	(19.7)
Property and equipment and other		(57.8)	(38.1)
Subsidiaries, net of cash transferred		0	(1,213.5)
Consolidated investment entities
Purchases of investments	[1]	(874)	(828.3)
Sale of investments	[1]	488.5	294.8
Change in short-term investments		18.9	94.9
Other		2.5	(1.1)
Net cash used in investing activities		(609.6)	(1,514.8)
Financing activities
Issuance of mandatory convertible preferred stock, net of issuance costs	[2]	0	276.4
Issuance of debt, net of issuance costs	[3]	0	1,286.1
Repayment of debt	[3]	0	(350)
Issuance of collateralized loan obligation notes	[1]	416.4	404.9
Issuance of debt for consolidated investment entities	[1]	189.1	385.4
Repayment of debt for consolidated investment entities	[1]	(318.1)	(296.3)
Acquisition of common stock		(98.5)	(6.9)
Common stock dividends paid		(75.7)	(60.6)
Preferred stock dividends paid		(9.3)	(4.8)
Withholding on stock based compensation		14.7	6.1
Non-controlling interest		0	7.7
Other		0	(3.5)
Net cash provided by financing activities		118.6	1,644.5
Effect of exchange rate changes on cash and cash equivalents		1.7	(22.8)
Cash included in business classified as held for sale		0	(22.3)
Change in cash and cash equivalents		236.4	256.9
Cash and cash equivalents at beginning of period		1,254	996.8
Cash and cash equivalents at end of period		$ 1,490.4	$ 1,253.7
[1]	Relates to cash flows from our variable interest entities. Refer to Note 8 for further information.
[2]	Refer to Note 14 for additional information.
[3]	Refer to Note 11 for additional information.

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Assurant, Inc. (the “Company”) is a global provider of risk management solutions in the housing and lifestyle markets, protecting where people live and the goods they buy. The Company operates in North America, Latin America, Europe and Asia Pacific through three operating segments: Global Housing, Global Lifestyle and Global Preneed. The Company partners with clients who are leaders in their industries to provide consumers a diverse range of protection products and services. Through its Global Housing segment, the Company provides lender-placed homeowners insurance (referred to as “Lender-placed Insurance”); renters insurance and related products (referred to as “Multifamily Housing”); manufactured housing and flood insurance and other specialty products (referred to as “Specialty and Other”). Through its Global Lifestyle segment, the Company provides mobile device protection products and related services 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 (referred to as “Global Financial Services and Other”). Through its Global Preneed segment, the Company provides pre-funded funeral insurance and annuity products.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 and for the three and six months ended June 30, 2019 and 2018 is unaudited. In the opinion of management, the interim data includes all adjustments, consisting only of normal recurring 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. Operating results for the three and six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. The accompanying unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Lease accounting: On January 1, 2019, the Company adopted the new lease guidance on a modified retrospective basis and therefore did not restate comparative periods. The new guidance requires that entities recognize assets and liabilities associated with leases on the balance sheet and disclose key information about leasing arrangements. The Company and its subsidiaries lease office space and equipment under operating lease arrangements for which the Company is the lessee. Therefore, the primary change at the time of adoption involved the recognition of right-of-use assets and lease liabilities related to operating leases with terms in excess of 12 months in which the Company is the lessee. Upon adoption, the Company elected the package of practical expedients permitted under the transition guidance, which allowed the carryforward of 1) historical lease classifications, 2) the prior assessment of whether a contract is or contains a lease, and 3) initial direct costs for any leases that existed prior to adoption. As of January 1, 2019, the new lease liability and right-of-use asset was $85.3 million and $78.0 million , respectively. Deferred rent liability of $7.3 million , which was required under the previous guidance, was reversed. There was an immaterial impact on equity upon adoption. As of June 30, 2019, the lease liability and right-of-use asset was $84.7 million and $76.7 million , respectively. These balances are included in accounts payable and other liabilities and other assets, respectively, in the consolidated balance sheets. For the three and six months ended June 30, 2019, the operating lease cost recognized for leases with terms in excess of 12 months was $5.6 million and $11.4 million , respectively, and related cash outflows reducing the lease liability was $5.5 million and $10.6 million , respectively. At June 30, 2019, the weighted average remaining lease term and discount rate was 6.7 years and 4.5% , respectively. Not Yet Adopted Measurement of credit losses on financial instruments held at amortized cost (“CECL”) : In June 2016, the Financial Accounting Standards Board (“FASB”) issued amended guidance on reporting credit losses for assets held at amortized cost and available for sale debt securities. For assets held at amortized cost, the amended guidance eliminates the probable recognition threshold and instead requires an entity to reflect the current estimate of all expected credit losses. For available for sale debt securities, credit losses will be measured in a manner similar to current accounting requirements; however, the amended guidance requires that credit losses be presented as an allowance rather than as a permanent impairment. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The Company expects to adopt the amended guidance on its effective date of January 1, 2020. The Company is evaluating the requirements of this amended guidance and the potential impact on the Company’s financial position and results of operations. While the Company expects an increase in its allowances for credit losses related to financial assets within scope of the standard, principally reinsurance receivables and commercial mortgage loans on real estate, the amount of the allowance will be dependent on the asset composition and economic conditions at that time of adoption. Financial Instruments — Credit Losses: Targeted Transition Relief: In May 2019, the FASB issued guidance which provides transition relief for entities adopting CECL. The transition relief will allow companies to irrevocably elect, upon adoption of CECL, the fair value option on financial instruments that were previously measured at amortized cost basis. The fair value option election does not apply to held-to-maturity debt securities. Entities are required to make this election on an instrument-by-instrument basis. The effective date of the guidance will be the same as the effective date for CECL. An entity may early adopt the guidance in any interim period after its issuance if the entity has adopted CECL. The transition amendments should be applied on a modified-retrospective basis by means of a cumulative-effect adjustment to the opening balance of retained earnings balance in the statement of financial position as of the date that an entity adopted the amendments in CECL. The Company is evaluating the cost and benefit of the transition relief from this guidance in its overall adoption of the guidance under CECL and the potential impact on the Company’s financial position and results of operations. Customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract : In August 2018, the FASB issued guidance aligning the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. For these arrangements, the guidance also limits the period to expense capitalized implementation costs based on the term of the hosting agreement, including the noncancellable period of the arrangement plus periods covered by options to extend the arrangement that are reasonably certain of exercise. The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments. The guidance is effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The guidance is required to be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is evaluating the requirements of this guidance and the potential impact on the Company’s financial position and results of operations. 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 an 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. For public business entities, the guidance is effective for fiscal years beginning after December 15, 2020, 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. In July 2019, the FASB voted for a proposal to extend the effective date of this guidance. If adopted, the proposal would extend the effective date for public business entities that are SEC filers to fiscal years beginning after December 15, 2021 (with early adoption permitted).

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions TWG Acquisition On May 31, 2018 (the “Acquisition Date”), the Company acquired TWG Holdings Limited and its subsidiaries (as subsequently reorganized, “TWG”) for total consideration of $2.47 billion . This amount included $894.9 million in cash, the repayment of TWG’s $595.9 million pre-existing debt and issuance of $975.5 million of Assurant, Inc. common stock. As a result, the equityholders of TWG, including TPG Capital and certain of its affiliates (“TPG”), received a total of 10.4 million shares of Assurant, Inc. common stock. In March 2019, TPG sold all remaining shares of common stock held by certain of its affiliates in an underwritten secondary public offering. TWG specializes in the underwriting, administration and marketing of service contracts on a wide variety of consumer goods, including automobiles, consumer electronics and major home appliances. Fair Value of Net Assets Acquired and Liabilities Assumed The initial accounting for the net assets acquired and liabilities assumed included certain provisional amounts recorded as of June 30, 2018 (the end of the reporting period in which the acquisition occurred). During the measurement period (which included the period from June 1, 2018 to May 31, 2019), the Company adjusted the provisional amounts to reflect new information obtained about facts and circumstances that existed as of the Acquisition Date, which, if known, would have affected the measurement of the amounts recognized as of that date. Such adjustments impacted certain identifiable assets acquired and liabilities assumed, resulting in a net increase to total identifiable net assets acquired and a corresponding decrease in goodwill of $25.7 million . The adjustments to income that would have been recognized in previous periods if the measurement period adjustments had been completed as of the Acquisition Date were immaterial. Assets acquired and (liabilities) assumed Fixed maturity securities available for sale $ 2,268.8 Equity securities 49.4 Short-term investments 165.5 Other investments 100.9 Cash and cash equivalents 380.1 Premiums and accounts receivable, net 286.2 Reinsurance recoverables 1,908.7 Accrued investment income 31.6 Property and equipment 15.4 Value of business acquired 3,973.0 Other intangible assets 459.7 Other assets 200.0 Unearned premiums and contract fees (7,512.6 ) Claims and benefits payable (419.9 ) Commissions payable (106.8 ) Reinsurance balances payable (186.1 ) Funds held under reinsurance (202.2 ) Accounts payable and other liabilities (381.7 ) Non-controlling interest (1.8 ) Total identifiable net assets acquired 1,028.2 Goodwill 1,438.1 Total acquisition consideration $ 2,466.3 Total goodwill of $1.44 billion is mainly attributable to expected growth and profitability, none of which is expected to be deductible for income tax purposes. VOBA and Other Intangible Assets The following table shows the purchase price allocation to value of business acquired (“VOBA”) and other intangible assets, including the effect of measurement period adjustments to provisional estimates as described above. Amount Value of business acquired (1) $ 3,973.0 Finite life (1): Customer related intangibles (distribution network) $ 390.3 Technology based intangibles 57.8 Total finite life other intangible assets 448.1 Indefinite life: Contract based intangibles 11.6 Total other intangible assets $ 459.7 (1) Refer to future estimated amortization table below for the amortization pattern of VOBA and other intangible assets with finite lives. Total amortization of VOBA related to TWG for the three months ended June 30, 2019 and 2018 was $294.0 million and $34.2 million , respectively, and for the six months ended June 30, 2019 and 2018 was $592.4 million and $34.2 million , respectively. Total amortization of other intangible assets related to TWG for the three months ended June 30, 2019 and 2018 was $4.6 million and $1.4 million , respectively, and for the six months ended June 30, 2019 and 2018 was $9.1 million and $1.4 million , respectively. At June 30, 2019, the estimated amortization of VOBA and other intangible assets with finite lives related to TWG for the remainder of 2019, the next five years and thereafter is as follows: Period VOBA Other Intangible Assets (with Finite Lives) July 1 - December 31, 2019 $ 503.9 $ 9.5 2020 812.7 26.1 2021 570.6 31.0 2022 350.8 34.9 2023 203.7 36.2 2024 91.7 36.6 Thereafter 7.5 254.1 Total $ 2,540.9 $ 428.4 Acquisition-related Costs Transaction costs related to the acquisition were expensed as incurred. These costs include advisory, legal, accounting, valuation and other professional or consulting fees, as well as general and administrative costs. Transaction costs incurred to date in connection with the acquisition of TWG totaled $40.4 million . There were no significant transactions costs for the three and six months ended June 30, 2019. Transaction costs included in the three and six months ended June 30, 2018 were $24.8 million and $30.0 million , respectively. Transaction costs were reported through the underwriting, general and administrative expenses line item in the consolidated statements of operations. As a part of the ongoing integration of TWG’s operations, the Company has incurred, and will continue to incur, costs associated with restructuring systems, processes and workforce. These costs include such items as severance, retention, facilities and consulting. Integration costs incurred to date in connection with the acquisition of TWG totaled $47.1 million , including $6.2 million and $10.5 million for the three months ended June 30, 2019 and 2018, respectively, and $16.6 million and $12.8 million

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information As of June 30, 2019, the Company had four reportable segments, which are defined based on the manner in which our chief operating decision maker, the Chief Executive Officer (“CEO”), reviews the business to assess performance and allocate resources, and align to the nature of the products and services offered: • Global Housing: provides lender-placed homeowners insurance; renters insurance and related products (referred to as “Multifamily Housing”); and manufactured housing and flood insurance and other specialty products (referred to as “Specialty and Other”); • Global Lifestyle: provides mobile device protection products and related services 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 (referred to as “Global Financial Services and Other”); • Global Preneed: provides pre-funded funeral insurance and annuity products; and • Corporate and Other: includes activities of the holding company, financing and interest expenses, net realized gains (losses) on investments, interest income earned from short-term investments held and income (expenses) primarily related to the Company’s frozen benefit plans. Corporate and Other also includes the amortization of deferred gains associated with the sales of businesses through reinsurance agreements, expenses related to the acquisition of TWG, foreign currency gains (losses) from remeasurement of monetary assets and liabilities, the gain or loss on the sale of businesses and other unusual or infrequent items. Additionally, the Corporate and Other segment includes amounts related to the runoff of the Assurant Health business. The following tables summarize selected financial information by segment: Three Months Ended June 30, 2019 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 471.8 $ 1,545.5 $ 15.4 $ — $ 2,032.7 Fees and other income 38.3 263.6 34.2 — 336.1 Net investment income 18.8 56.5 70.6 8.3 154.2 Net realized gains on investments — — — 17.8 17.8 Amortization of deferred gains on disposal of businesses — — — 4.7 4.7 Total revenues 528.9 1,865.6 120.2 30.8 2,545.5 Benefits, losses and expenses Policyholder benefits 207.8 412.9 66.2 0.1 687.0 Amortization of deferred acquisition costs and value of business acquired 57.5 740.7 17.6 — 815.8 Underwriting, general and administrative expenses (1) 173.3 570.2 14.7 74.7 832.9 Interest expense — — — 26.5 26.5 Total benefits, losses and expenses 438.6 1,723.8 98.5 101.3 2,362.2 Segment income (loss) before provision (benefit) for income tax 90.3 141.8 21.7 (70.5 ) 183.3 Provision (benefit) for income taxes 18.8 32.5 4.8 (15.4 ) 40.7 Segment income (loss) after taxes 71.5 109.3 16.9 (55.1 ) 142.6 Less: Net loss attributable to non-controlling interests — — — 1.5 1.5 Net income (loss) attributable to stockholders 71.5 109.3 16.9 (53.6 ) 144.1 Less: Preferred stock dividends — — — (4.6 ) (4.6 ) Net income (loss) attributable to common stockholders $ 71.5 $ 109.3 $ 16.9 $ (58.2 ) $ 139.5 As of June 30, 2019 Segment assets: $ 4,029.6 $ 22,113.9 $ 7,264.6 $ 9,731.4 $ 43,139.5 (1) Corporate and Other includes a $14.6 million impairment of certain intangible assets from the acquisition of Green Tree Insurance Agency (“Green Tree”) as a result of recent developments related to the financial status of a business partner providing new and renewal business to Green Tree. Three Months Ended June 30, 2018 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 449.7 $ 874.3 $ 14.2 $ 0.1 $ 1,338.3 Fees and other income 92.8 227.9 32.7 0.8 354.2 Net investment income 15.9 36.6 67.9 15.2 135.6 Net realized losses on investments — — — (11.4 ) (11.4 ) Amortization of deferred gains on disposal of businesses — — — 15.0 15.0 Total revenues 558.4 1,138.8 114.8 19.7 1,831.7 Benefits, losses and expenses Policyholder benefits 187.2 239.3 65.0 (0.9 ) 490.6 Amortization of deferred acquisition costs and value of business acquired 50.4 395.6 17.2 — 463.2 Underwriting, general and administrative expenses 229.3 419.6 13.8 110.9 773.6 Interest expense — — — 26.0 26.0 Total benefits, losses and expenses 466.9 1,054.5 96.0 136.0 1,753.4 Segment income (loss) before provision (benefit) for income tax 91.5 84.3 18.8 (116.3 ) 78.3 Provision (benefit) for income taxes 18.9 16.2 4.1 (27.9 ) 11.3 Segment income (loss) after taxes 72.6 68.1 14.7 (88.4 ) 67.0 Less: Preferred stock dividends — — — (4.8 ) (4.8 ) Net income (loss) attributable to common stockholders $ 72.6 $ 68.1 $ 14.7 $ (93.2 ) $ 62.2 Six Months Ended June 30, 2019 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 931.9 $ 2,974.0 $ 31.2 $ — $ 3,937.1 Fees and other income 78.2 516.7 67.5 2.0 664.4 Net investment income 44.2 115.4 139.7 21.2 320.5 Net realized gains on investments — — — 46.6 46.6 Amortization of deferred gains on disposal of businesses — — — 12.5 12.5 Total revenues 1,054.3 3,606.1 238.4 82.3 4,981.1 Benefits, losses and expenses Policyholder benefits 406.7 760.1 134.8 0.1 1,301.7 Amortization of deferred acquisition costs and value of business acquired 111.4 1,446.5 35.2 — 1,593.1 Underwriting, general and administrative expenses (1) 354.0 1,126.0 31.6 121.4 1,633.0 Interest expense — — — 53.0 53.0 Total benefits, losses and expenses 872.1 3,332.6 201.6 174.5 4,580.8 Segment income (loss) before provision (benefit) for income tax 182.2 273.5 36.8 (92.2 ) 400.3 Provision (benefit) for income taxes 38.0 63.6 8.1 (20.6 ) 89.1 Segment income (loss) after taxes 144.2 209.9 28.7 (71.6 ) 311.2 Less: Net income attributable to non-controlling interests — — — (1.4 ) (1.4 ) Net income (loss) attributable to stockholders 144.2 209.9 28.7 (73.0 ) 309.8 Less: Preferred stock dividends — — — (9.3 ) (9.3 ) Net income (loss) attributable to common stockholders $ 144.2 $ 209.9 $ 28.7 $ (82.3 ) $ 300.5 (1) Corporate and Other includes a $14.6 million impairment of certain intangible assets from the acquisition of Green Tree as a result of recent developments related to the financial status of a business partner providing new and renewal business to Green Tree. Six Months Ended June 30, 2018 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 886.1 $ 1,547.9 $ 28.8 $ 0.4 $ 2,463.2 Fees and other income 179.5 472.8 64.3 2.1 718.7 Net investment income 36.1 68.7 133.7 27.3 265.8 Net realized losses on investments — — — (10.9 ) (10.9 ) Amortization of deferred gains on disposal of businesses — — — 33.5 33.5 Total revenues 1,101.7 2,089.4 226.8 52.4 3,470.3 Benefits, losses and expenses Policyholder benefits 356.3 420.9 131.7 (3.7 ) 905.2 Amortization of deferred acquisition costs and value of business acquired 100.0 675.9 33.7 — 809.6 Underwriting, general and administrative expenses 464.2 835.4 30.0 163.6 1,493.2 Interest expense — — — 47.5 47.5 Total benefits, losses and expenses 920.5 1,932.2 195.4 207.4 3,255.5 Segment income (loss) before provision (benefit) for income tax 181.2 157.2 31.4 (155.0 ) 214.8 Provision (benefit) for income taxes 37.4 33.3 6.9 (35.8 ) 41.8 Segment income (loss) after taxes 143.8 123.9 24.5 (119.2 ) 173.0 Less: Preferred stock dividends — — — (4.8 ) (4.8 ) Net income (loss) attributable to common stockholders $ 143.8 $ 123.9 $ 24.5 $ (124.0 ) $ 168.2

Contract Revenues

Contract Revenues	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Contracts 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. Revenue 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 statement of operations are $27.4 million and $84.2 million for Global Housing and $218.2 million and $151.2 million for Global Lifestyle for the three months ended June 30, 2019 and 2018, respectively. The disaggregated revenues included in fees and other income on the consolidated statement of operations are $57.6 million and $160.3 million for Global Housing and $425.8 million and $324.8 million for Global Lifestyle for the six months ended June 30, 2019 and 2018, respectively. 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. Until the sale of the Mortgage Solutions business on August 1, 2018, the Company previously offered valuation and title services and products across the origination, home equity and default markets, as well as field services, inspection services, restoration and real estate owned asset management services to mortgage servicing clients and investors. 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. 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 sells repaired or refurbished mobile and other electronic devices. Revenue from products sold is recognized when risk of ownership transfers to customers, generally upon shipment. Each product has a standalone selling price that is determined through analysis of various factors including market data, historical costs and product lifecycle status. Payments are generally due prior to shipment or within a short-term period. Contract Balances The receivables and unearned revenue under these contracts were $175.0 million and $93.4 million , respectively, as of June 30, 2019, and $183.7 million and $88.7 million , respectively, as of December 31, 2018. These balances are included in premiums and accounts receivable and the accounts payable and other liabilities, respectively, in the consolidated balance sheets. Revenue from service contracts and sales of products recognized during the three and six months ended June 30, 2019 that was included in unearned revenue as of December 31, 2018 was $14.6 million and $30.2 million , respectively. In certain circumstances, the Company defers upfront commissions and other costs in connection with client contracts in excess of one year where the Company can demonstrate future economic benefit. For these contracts, expense is recognized as revenues are earned. The Company periodically assesses recoverability based on the performance of the related contracts. As of June 30, 2019 and December 31, 2018, the Company has approximately $31.0 million and $29.0 million

Investments

Investments	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Investments	Investments The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and other-than-temporary impairment (“OTTI”) included within AOCI of the Company’s fixed maturity securities as of the dates indicated: June 30, 2019 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (1) Fixed maturity securities: U.S. government and government agencies and authorities $ 225.0 $ 6.1 $ (0.1 ) $ 231.0 $ — States, municipalities and political subdivisions 236.4 26.2 — 262.6 — Foreign governments 878.7 102.5 (0.1 ) 981.1 — Asset-backed 517.1 1.5 (2.2 ) 516.4 — Commercial mortgage-backed 222.8 10.4 (0.8 ) 232.4 — Residential mortgage-backed 1,212.5 52.0 (2.1 ) 1,262.4 4.2 U.S. corporate 5,684.6 690.1 (3.7 ) 6,371.0 15.5 Foreign corporate 2,130.6 242.1 (0.8 ) 2,371.9 — Total fixed maturity securities $ 11,107.7 $ 1,130.9 $ (9.8 ) $ 12,228.8 $ 19.7 December 31, 2018 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (1) Fixed maturity securities: U.S. government and government agencies and authorities $ 381.4 $ 4.4 $ (1.2 ) $ 384.6 $ — States, municipalities and political subdivisions 238.9 17.6 (0.3 ) 256.2 — Foreign governments 856.3 58.8 (3.0 ) 912.1 — Asset-backed 513.6 0.5 (9.6 ) 504.5 — Commercial mortgage-backed 79.1 2.2 (1.6 ) 79.7 — Residential mortgage-backed 1,399.1 21.5 (14.8 ) 1,405.8 5.0 U.S. corporate 5,337.0 315.7 (59.7 ) 5,593.0 14.1 Foreign corporate 2,028.6 110.7 (18.1 ) 2,121.2 — Total fixed maturity securities $ 10,834.0 $ 531.4 $ (108.3 ) $ 11,257.1 $ 19.1 (1) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date. 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 0.3% and 0.4% of the overall investment portfolio as of June 30, 2019 and December 31, 2018, respectively. As of June 30, 2019 and December 31, 2018, the securities included general obligation and revenue bonds issued by states, cities, counties, school districts and similar issuers, including $59.2 million and $58.4 million , respectively, of advance refunded or escrowed-to-maturity bonds (collectively referred to as “pre-refunded bonds”), which are bonds for which an irrevocable trust has been established to fund the remaining payments of principal and interest. As of June 30, 2019 and December 31, 2018, revenue bonds accounted for 56% of the holdings. Excluding pre-refunded 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 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 June 30, 2019, approximately 57% , 18% , 6% and 6% of the foreign government securities were held in Canadian government/provincials and the governments of Brazil, Mexico, and the United Kingdom, respectively. As of December 31, 2018, approximately 55% , 18% and 8% of the foreign government securities were held in Canadian government/provincials and the governments of Brazil and the United Kingdom, respectively. No other country represented more than 4% and 6% of the Company’s foreign government securities as of June 30, 2019 and December 31, 2018, respectively. The Company had European investment exposure in its corporate fixed maturity securities of $809.4 million with a net unrealized gain of $69.1 million as of June 30, 2019 and $800.9 million with a net unrealized gain of $27.7 million as of December 31, 2018. Approximately 27% of the corporate fixed maturity European exposure was held in the financial industry as of June 30, 2019 and December 31, 2018. The Company’s largest European country exposure (the United Kingdom) represented approximately 4% and 5% of the fair value of the Company’s corporate fixed maturity securities as of June 30, 2019 and December 31, 2018, respectively. 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 cost or amortized cost and fair value of fixed maturity securities as of June 30, 2019 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 Amortized Cost Fair Value Due in one year or less $ 330.5 $ 332.6 Due after one year through five years 2,553.4 2,638.1 Due after five years through ten years 2,478.9 2,673.6 Due after ten years 3,792.5 4,573.3 Total 9,155.3 10,217.6 Asset-backed 517.1 516.4 Commercial mortgage-backed 222.8 232.4 Residential mortgage-backed 1,212.5 1,262.4 Total $ 11,107.7 $ 12,228.8 The following table sets forth the net realized gains (losses), including OTTI, recognized in the statement of operations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 8.0 $ (7.6 ) $ 7.7 $ (10.2 ) Equity securities (1) 7.0 (5.9 ) 36.9 (3.7 ) Other investments 5.2 1.2 5.1 2.5 Consolidated investment entities (2) (1.8 ) 0.9 (2.2 ) 0.5 Total net realized gains (losses) related to sales and other 18.4 (11.4 ) 47.5 (10.9 ) Net realized losses related to other-than-temporary impairments: Fixed maturity securities (0.6 ) — (0.9 ) — Total net realized gains (losses) $ 17.8 $ (11.4 ) $ 46.6 $ (10.9 ) (1) Six months ended June 30, 2019 and 2018 includes $10.4 million and $7.8 million , respectively, of gains on equity investment holdings accounted for under the measurement alternative. There were no changes in fair value recorded on equity investments holdings accounted for under the measurement alternative for the three months ended June 30, 2019 and 2018. (2) Consists of net realized gains (losses) from the change in fair value of the Company’s direct investment in collateralized loan obligations (“CLOs”). Refer to Note 8 for additional information. The following table sets forth the portion of unrealized gains (losses) related to equity securities during the three and six months ended March 31, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net gains (losses) recognized on equity securities $ 7.0 $ (5.9 ) $ 36.9 $ (3.7 ) Less: Net realized gains (losses) related to sales of equity securities 0.1 2.3 (0.9 ) 3.7 Total net unrealized gains (losses) on equity securities held $ 6.9 $ (8.2 ) $ 37.8 $ (7.4 ) The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 Less than 12 months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: U.S. government and government agencies and authorities $ — $ — $ 46.0 $ (0.1 ) $ 46.0 $ (0.1 ) Foreign governments 49.7 (0.1 ) — — 49.7 (0.1 ) Asset-backed 206.5 (1.9 ) 23.5 (0.3 ) 230.0 (2.2 ) Commercial mortgage-backed 1.8 (0.1 ) 18.3 (0.7 ) 20.1 (0.8 ) Residential mortgage-backed 11.5 (0.1 ) 148.6 (2.0 ) 160.1 (2.1 ) U.S. corporate 64.2 (1.6 ) 62.3 (2.1 ) 126.5 (3.7 ) Foreign corporate 32.5 (0.4 ) 22.3 (0.4 ) 54.8 (0.8 ) Total fixed maturity securities $ 366.2 $ (4.2 ) $ 321.0 $ (5.6 ) $ 687.2 $ (9.8 ) December 31, 2018 Less than 12 months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: U.S. government and government agencies and authorities $ 11.2 $ (0.1 ) $ 89.5 $ (1.1 ) $ 100.7 $ (1.2 ) States, municipalities and political subdivisions 31.5 (0.1 ) 3.1 (0.2 ) 34.6 (0.3 ) Foreign governments 136.4 (2.8 ) 9.2 (0.2 ) 145.6 (3.0 ) Asset-backed 370.6 (9.6 ) — — 370.6 (9.6 ) Commercial mortgage-backed 29.4 (0.7 ) 12.4 (0.9 ) 41.8 (1.6 ) Residential mortgage-backed 378.2 (3.7 ) 309.6 (11.1 ) 687.8 (14.8 ) U.S. corporate 1,860.4 (49.5 ) 173.1 (10.2 ) 2,033.5 (59.7 ) Foreign corporate 706.6 (12.9 ) 149.5 (5.2 ) 856.1 (18.1 ) Total fixed maturity securities $ 3,524.3 $ (79.4 ) $ 746.4 $ (28.9 ) $ 4,270.7 $ (108.3 ) Total gross unrealized losses represented approximately 1% and 3% of the aggregate fair value of the related securities as of June 30, 2019 and December 31, 2018, respectively. Approximately 43% and 73% of these gross unrealized losses had been in a continuous loss position for less than twelve months as of June 30, 2019 and December 31, 2018, respectively. The total gross unrealized losses are comprised of 332 and 2,642 individual securities as of June 30, 2019 and December 31, 2018, respectively. In accordance with its policy, the Company concluded that for these securities, other-than-temporary impairments of the gross unrealized losses was not warranted as of June 30, 2019 and December 31, 2018. 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 June 30, 2019, approximately 35% of the outstanding principal balance of commercial mortgage loans was concentrated in the states of California, Utah 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 $0.1 million to $12.4 million as of June 30, 2019 and from $0.1 million to $12.5 million as of December 31, 2018.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2019
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities In the normal course of business, the Company is involved with various types of investment entities that may be considered variable interest entities (“VIEs”). The Company evaluates its involvement with each entity to determine whether consolidation is required. The Company’s maximum risk of loss is limited to the carrying value and unfunded commitments of its investments in the VIEs. Consolidated VIEs One of the Company’s subsidiaries is registered with the U.S. Securities and Exchange Commission (the “SEC”) as an investment adviser. The subsidiary (or one of its affiliates) manages and invests in CLOs and real estate funds and may conduct other forms of investment activities. The Company has determined that the CLOs and real estate funds are VIEs and consolidated each because the Company was deemed to be the primary beneficiary of these entities due to (i) its role a s collateral manager, which gives it the power to direct the activities that most significantly impact the economic performance of the e ntities, and (ii) its economic interest in the entities, which exposes it to losses and the right to receive benefits that could potentially be significant to the entities. In connection with the formation of CLO structures, the Company forms special purpose entities capitalized by contributions from the Company’s wholly owned subsidiaries. Subsequent to capitalization, the special purpose entities purchase senior secured leveraged loans funded by contributions from the Company and a short-term warehousing credit facility. Borrowings from the warehousing credit facility are non-recourse to the Company and are fully repaid once the CLO closes. Additionally, the amounts contributed by the Company to fund the initial capitalization are returned after the CLO closes. The Company may elect to use the return of capital to purchase a direct investment in the CLO. Collateralized Loan Obligations: The CLO entities are collateralized financing entities. The carrying value of the CLO debt equals the fair value of the CLO assets (senior secured leveraged loans) as the assets have more observable fair values. The CLO liabilities are reduced by the beneficial interests the Company retains in the CLO. CLO earnings attributable to the Company’s shareholders are measured by the change in the fair value of the Company’s CLO investments, net investment income earned and investment management and contingent performance fees earned. Investment management fees are reported as a reduction to investment expenses in the consolidated statements of operations. The assets of the CLOs are legally isolated from the Company’s creditors and can only be used to settle the obligations of the CLOs. The liabilities of the CLOs are non-recourse to the Company and the Company has no obligations to satisfy the liabilities of the CLOs. As of June 30, 2019, the Company and its subsidiaries held a range of 43.8% to 100.0% of the most subordinated debt tranches of four CLO entities and 5.0% of senior debt tranches in one CLO entity, which represents a range of 6.0% to 8.8% overall ownership in each of the CLO entities. As of June 30, 2019, a fifth CLO structure was funded with $73.0 million in contributions from the Company’s wholly owned subsidiaries. The carrying value of the Company’s investment in the CLOs that have closed was $90.1 million and $55.2 million in subordinated debt tranches and $21.2 million and $21.0 million in senior debt tranches as of June 30, 2019 and December 31, 2018, respectively. Real Estate Funds: The Company’s real estate fund investments are closed ended funds that include contributions from third party investors, which are recorded as non-controlling interests. Real estate fund earnings attributable to the Company’s shareholders are measured by the net investment income of the real estate funds, which includes the change in fair value of the Company’s investments in the real estate funds and investment management fees earned. During the six months ended June 30, 2019, the Company formed a second real estate fund capitalized with $15.4 million of contributions from the Company’s wholly owned subsidiaries. The Company has a majority investment in the real estate funds in the form of equity interests. The carrying value of the Company’s investment in the real estate funds was $116.2 million and $91.5 million as of June 30, 2019 and December 31, 2018, respectively. The Company’s unfunded commitment in the real estate funds was $3.8 million as of June 30, 2019. For all consolidated investment entities, intercompany transactions are eliminated upon consolidation. Fair Value of VIE Assets and Liabilities The Company categorizes its fair value measurements according to a three-level hierarchy. See Note 9 for the definition of the three levels of the fair value hierarchy. The following table presents the Company’s fair value hierarchy for financial assets and liabilities held by consolidated investment entities measured at fair value on a recurring basis as of the dates indicated: June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 84.8 $ 84.8 (1) $ — $ — Corporate debt securities 1,838.9 — 1,838.9 — Real estate funds 138.2 — — 138.2 Total financial assets $ 2,061.9 $ 84.8 $ 1,838.9 $ 138.2 Financial Liabilities Collateralized loan obligation notes $ 1,616.5 $ — $ 1,616.5 $ — Total financial liabilities $ 1,616.5 $ — $ 1,616.5 $ — December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 62.6 $ 62.6 (1) $ — $ — Corporate debt securities 1,464.2 — 1,464.2 — Real estate funds 112.0 — — 112.0 Total financial assets $ 1,638.8 $ 62.6 $ 1,464.2 $ 112.0 Financial Liabilities Collateralized loan obligation notes $ 1,316.7 $ — $ 1,316.7 $ — Total financial liabilities $ 1,316.7 $ — $ 1,316.7 $ — (1) Amounts consist of money market funds. Level 2 Securities Corporate debt securities: These assets are comprised of senior secured leveraged loans. The Company values these securities using estimates of fair value from a pricing service which utilizes the market valuation technique. The primary observable market inputs used by the pricing service are prices of reported trades from dealers. The fair value is calculated using a simple average of the prices received. Collateralized loan obligation notes: As the Company elected the measurement alternative, the carrying value of the CLO debt is equal to the fair value of the CLO assets. The CLO notes are classified within Level 2 of the fair value hierarchy, consistent with the classification of the majority of the CLO financial assets. Level 3 Securities Real estate funds: These assets are comprised of investments in limited partnerships whose underlying investments are real estate properties. The market, income and cost approach valuation techniques are used to calculate fair value as appropriate given the type of real estate property, as well as the use of independent external appraisals. Significant unobservable inputs, including capitalization rates, discount rates, market comparables, expense growth rates, leasing assumptions and replacement costs, are used as appropriate to calculate fair value. The following table summarizes the change in balance sheet carrying value associated with Level 3 assets held by consolidated investment entities measured at fair value during the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Balance, beginning of period $ 121.4 $ 86.8 $ 112.0 $ 84.7 Purchases 15.4 23.0 15.4 23.0 Sales — (6.8 ) — (6.8 ) Total income (loss) included in retained earnings 1.4 (0.5 ) 10.8 1.6 Balance, end of period $ 138.2 $ 102.5 $ 138.2 $ 102.5

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2019
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. In accordance with this guidance, 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. In such instances, the transfer between levels is reported as of the beginning of the reporting period. The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018. The amounts presented below for short-term investments, other investments, cash equivalents, other receivables, 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. June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 231.0 $ — $ 231.0 $ — States, municipalities and political subdivisions 262.6 — 262.6 — Foreign governments 981.1 0.5 980.6 — Asset-backed 516.4 — 514.8 1.6 Commercial mortgage-backed 232.4 — 192.8 39.6 Residential mortgage-backed 1,262.4 — 1,258.6 3.8 U.S. corporate 6,371.0 — 6,359.7 11.3 Foreign corporate 2,371.9 — 2,320.8 51.1 Equity securities: Mutual funds 44.2 44.2 — — Common stocks 18.8 18.1 0.7 — Non-redeemable preferred stocks 329.2 — 327.0 2.2 Short-term investments 321.9 216.1 (2) 105.8 — Other investments 235.0 70.6 (1) 163.9 (3) 0.5 (4) Cash equivalents 607.8 604.0 (2) 3.8 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 4.7 — 0.7 (5) 4.0 (5) Assets held in separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial assets $ 15,594.5 $ 2,574.9 $ 12,900.5 $ 119.1 Financial Liabilities Other liabilities $ 123.9 $ 70.6 (1) $ 0.2 (5) $ 53.1 (6) Liabilities related to separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial liabilities $ 1,923.0 $ 1,692.0 $ 177.9 $ 53.1 December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 384.6 $ — $ 384.6 $ — States, municipalities and political subdivisions 256.2 — 256.2 — Foreign governments 912.1 0.5 911.6 — Asset-backed 504.5 — 504.5 — Commercial mortgage-backed 79.7 — 40.8 38.9 Residential mortgage-backed 1,405.8 — 1,405.8 — U.S. corporate 5,593.0 — 5,580.3 12.7 Foreign corporate 2,121.2 — 2,071.7 49.5 Equity securities: Mutual funds 45.0 45.0 — — Common stocks 15.3 14.6 0.7 — Non-redeemable preferred stocks 318.5 — 316.3 2.2 Short-term investments 336.0 188.9 (2) 147.1 — Other investments 224.9 62.9 (1) 161.5 (3) 0.5 (4) Cash equivalents 527.7 523.6 (2) 4.1 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 2.6 — — 2.6 (5) Assets held in separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial assets $ 14,307.8 $ 2,235.6 $ 11,960.8 $ 111.4 Financial Liabilities Other liabilities $ 104.8 $ 62.9 (1) $ 0.7 (5) $ 41.2 (6) Liabilities related to separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial liabilities $ 1,680.5 $ 1,463.0 $ 176.3 $ 41.2 (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 fixed maturity securities and other derivatives. (5) Primarily includes other derivative assets and liabilities. (6) Primarily includes contingent consideration receivables/liabilities and derivative financial instruments. 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: June 30, 2019 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 783.1 $ 811.6 $ — $ — $ 811.6 Other investments 139.2 139.2 31.3 — 107.9 Other assets 36.9 36.9 — — 36.9 Total financial assets $ 959.2 $ 987.7 $ 31.3 $ — $ 956.4 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 564.4 $ 568.9 $ — $ — $ 568.9 Funds withheld under reinsurance 308.0 308.0 308.0 — — Debt 2,007.3 2,169.3 — 2,169.3 — Total financial liabilities $ 2,879.7 $ 3,046.2 $ 308.0 $ 2,169.3 $ 568.9 December 31, 2018 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 759.6 $ 735.1 $ — $ — $ 735.1 Other investments 124.9 124.9 33.9 — 91.0 Other assets 43.0 43.0 — — 43.0 Total financial assets $ 927.5 $ 903.0 $ 33.9 $ — $ 869.1 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 570.6 $ 556.8 $ — $ — $ 556.8 Funds withheld under reinsurance 272.0 272.0 272.0 — — Debt 2,006.0 2,058.7 — 2,058.7 — Total financial liabilities $ 2,848.6 $ 2,887.5 $ 272.0 $ 2,058.7 $ 556.8 (1) Only the fair value of the Company’s policy reserves for investment-type contracts (those without significant mortality or morbidity risk) are reflected in the table above. Reinsurance Recoverables Credit Disclosures A key credit quality indicator for reinsurance is the A.M. Best Company (“A.M. Best”) financial strength rating of the reinsurer. The A.M. Best ratings are an independent opinion of a reinsurer’s ability to meet ongoing obligations to policyholders. The A.M. Best ratings for new reinsurance agreements where there is material credit exposure are reviewed at the time of execution. The A.M. Best ratings for existing reinsurance agreements are reviewed on a quarterly basis, or sooner based on developments. The A.M. Best ratings for the Company’s four largest reinsurers associated with previously disposed businesses (consisting of Sun Life Assurance Company of Canada, John Hancock Life Insurance Company, Talcott Resolution Life and Annuity Insurance Company and Employers Reassurance Corporation (“ERAC”)) have not changed significantly since December 31, 2018, except for ERAC which was affirmed as B+ with a stable outlook and subsequently withdrawn at the request of ERAC in March 2019. As of June 30, 2019 and December 31, 2018, the Company had $777.2 million and $775.9 million , respectively, of reinsurance recoverables from ERAC. An allowance for doubtful accounts for reinsurance recoverables is recorded on the basis of periodic evaluations of balances due from reinsurers (net of collateral), reinsurer solvency, management’s experience and current economic conditions. The Company carried an allowance for doubtful accounts for reinsurance recoverables of $0.3 million as of June 30, 2019 and December 31, 2018.

Reserves

Reserves	6 Months Ended
	Jun. 30, 2019
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 Six Months Ended June 30, 2019 2018 Claims and benefits payable, at beginning of period $ 2,813.7 $ 3,782.2 Less: Reinsurance ceded and other (2,053.7 ) (3,193.3 ) Net claims and benefits payable, at beginning of period 760.0 588.9 Acquired reserves as of Acquisition Date (1) — 140.7 Incurred losses and loss adjustment expenses related to: Current year 1,339.4 940.3 Prior years (37.7 ) (30.6 ) Total incurred losses and loss adjustment expenses 1,301.7 909.7 Paid losses and loss adjustment expenses related to: Current year 882.9 624.6 Prior years 409.2 336.4 Total paid losses and loss adjustment expenses 1,292.1 961.0 Net claims and benefits payable, at end of period 769.6 678.3 Plus: Reinsurance ceded and other (2) 1,952.6 2,824.8 Claims and benefits payable, at end of period (2) (3) $ 2,722.2 $ 3,503.1 (1) Acquired reserves from TWG on the Acquisition Date include $419.9 million of gross claims and benefits payable, and $279.2 million of ceded claims and benefits payable. The reserve roll forward includes the activity of TWG from June 1, 2018 to June 30, 2018. (2) Includes reinsurance recoverables and claims and benefits payable of $83.2 million and $89.6 million as of June 30, 2019 and 2018, 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. (3) Claims and benefits payable and related reinsurance ceded were reduced by $730.0 million in December 2018 as result of the sale of Time Insurance Company, a legal entity associated with the previously exited Assurant Health business. The Company experienced favorable development in both six month periods presented in the roll forward table above. Global Lifestyle contributed $30.3 million and $20.8 million to the net favorable development during the six months ended June 30, 2019 and 2018, respectively. The net favorable development in 2019 was primarily attributable to mobile device protection products and business acquired from TWG, where losses from more recent accident years were favorable to expectations. The net favorable development in 2018 was primarily attributable to lower than expected losses from extended service contracts and mobile device protection products. Many of these contracts and products contain retrospective commission (profit sharing) provisions that would result in offsetting increases or decreases in expense dependent on if the development was favorable or unfavorable. Global Housing contributed $3.9 million and $3.6 million of net favorable development for the six months ended June 30, 2019 and 2018, respectively. The net favorable development in 2019 was primarily attributable to prior catastrophes, whereby increased subrogation associated with the 2017 and 2018 California wildfires was partially offset by net unfavorable development from Hurricane Michael. The net favorable development in 2018 was also primarily attributable to prior catastrophes of $2.9 million . Global Preneed, Assurant Health and other contributed $3.5 million and $6.2 million

Debt

Debt	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 and December 31, 2018: June 30, 2019 December 31, 2018 Principal Amount Carrying Value Floating Rate Senior Notes due March 2021 (1) $ 300.0 $ 298.4 $ 298.1 4.00% Senior Notes due March 2023 350.0 348.3 348.1 4.20% Senior Notes due September 2023 300.0 297.1 296.8 4.90% Senior Notes due March 2028 300.0 297.7 297.6 6.75% Senior Notes due February 2034 375.0 371.0 370.9 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 (2) 400.0 394.8 394.5 Total debt $ 2,007.3 $ 2,006.0 (1) Bears floating interest at a rate equal to three-month LIBOR plus 1.25% . (2) Bears a 7.00% annual interest rate from March 2018 to March 2028 and annual interest rate equal to three-month LIBOR plus 4.135% thereafter. 2021, 2023 and 2028 Senior Notes: In March 2018, the Company issued three series of senior notes with an aggregate principal amount of $900.0 million . • 2021 Senior Notes : The first series of senior notes is $300.0 million in principal amount, bears floating interest rate equal to three-month LIBOR plus 1.25% ( 3.58% as of June 30, 2019) and is payable in a single installment due March 2021 (“2021 Senior Notes”). Interest on the 2021 Senior Notes is payable quarterly. Commencing on or after March 2019, the Company may redeem the 2021 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest. • 2023 Senior Notes : The second series of senior notes is $300.0 million in principal amount, bears interest at 4.20% per year, is payable in a single installment due September 2023 and was issued at a 0.233% discount (“2023 Senior Notes”). Interest on the 2023 Senior Notes is payable semi-annually. Prior to August 2023, the Company may redeem the 2023 Senior Notes at any time in whole or from time to time in part at a make-whole premium plus accrued and unpaid interest. On or after that date, the Company may redeem the 2023 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest. • 2028 Senior Notes : The third series of senior notes is $300.0 million in principal amount, bears interest at 4.90% per year, is payable in a single installment due March 2028 and was issued at a 0.383% discount (“2028 Senior Notes”). Interest on the 2028 Senior Notes is payable semi-annually. Prior to December 2027, the Company may redeem the 2028 Senior Notes at any time in whole or from time to time in part of a make-whole premium plus accrued and unpaid interest. On or after that date, the Company may redeem the 2028 Senior Notes at any time in whole or from time to time in part at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest. The interest rate payable on each of the 2021 Senior Notes, the 2023 Senior Notes and the 2028 Senior Notes will be subject to adjustment from time to time, if either Moody’s Investor Service, Inc. (“Moody’s”) or S&P Global Ratings, a division of S&P Global Inc. (“S&P”) downgrades the credit rating assigned to such series of senior notes to Ba1 or below or to BB+ or below, respectively, or subsequently upgrades the credit ratings once the senior notes are at or below such levels. The following table details the increase in interest rate over the issuance rate by rating with the impact equal to the sum of the number of basis points next to such rating for a maximum increase of 200 basis points over the issuance rate: Rating Agencies Rating Levels Moody’s (1) S&P (1) Interest Rate Increase (2) 1 Ba1 BB+ 25 basis points 2 Ba2 BB 50 basis points 3 Ba3 BB- 75 basis points 4 B1 or below B+ or below 100 basis points (1) Including the equivalent ratings of any substitute rating agency. (2) Applies to each rating agency individually. Subordinated Notes In March 2018, the Company issued fixed-to-floating rate subordinated notes due March 2048 with principal amount of $400.0 million (the “Subordinated Notes”) which bear interest from March 2018 to March 2028, at an annual rate of 7.00% , payable semi-annually. The Subordinated Notes will bear interest at an annual rate equal to three-month LIBOR plus 4.135% , payable quarterly, beginning in June 2028. On or after March 2028, the Company may redeem the Subordinated Notes, in whole at any time or in part from time to time at a redemption price equal to their principal amount plus accrued and unpaid interest; provided that if they are not redeemed in whole, a minimum amount must remain outstanding. At any time prior to March 2028, the Company may redeem the Subordinated Notes in whole but not in part after the occurrence of a tax event, rating agency event or regulatory capital event as defined in the global note representing the Subordinated Notes, at a redemption price equal to (i) with respect to the rating agency, 102% of their principal amount and (ii) with respect to a tax event or regulatory capital event, their principal amount, in each case plus accrued and unpaid interest. In addition, so long as no event of default with respect to the Subordinated Notes has occurred and is continuing, the Company has the right, on one or more occasions, to defer the payment of interest on the Subordinated Notes for one or more consecutive interest periods for up to five years as described in the global note representing the Subordinated Notes. During a deferral period, interest will continue to accrue on the Subordinated Notes at the then-applicable interest rates. At any time when the Company has given notice of its election to defer interest payments on the Subordinated Notes, the Company generally may not make payments on or redeem or purchase any shares of the Company’s capital stock or any of its debt securities or guarantees that rank upon the Company’s liquidation on a parity with or junior to the Subordinated Notes, subject to certain limited exceptions. The net proceeds from the sale of the Notes were $1.29 billion , after deducting the underwriting discounts and offering expenses. The Company used the proceeds from the 2021 Senior Notes, the 2023 Senior Notes, the 2028 Senior Notes and the Subordinated Notes, together with the proceeds from the issuance of its 6.50% Series D Mandatory Convertible Preferred Stock, par value of $1.00 per share (the “MCPS”), available cash on hand at closing and common stock consideration, to fund the TWG acquisition and pay related fees and expenses. A portion of the aggregate proceeds was used to repay the Company’s then-outstanding $350.0 million of 2.50% Senior Notes upon maturity in March 2018. Other Notes In March 2013, the Company issued two series of senior notes with an aggregate principal amount of $700.0 million . The first series was $350.0 million in principal amount, bore interest at 2.50% per year and was repaid in a single installment in March 2018. The second series is $350.0 million in principal amount and was issued at a 0.365% discount. This series bears interest at 4.00% per year and is payable in a single installment due March 2023. Interest is payable semi-annually. The Company may redeem the outstanding series of senior notes in whole or in part at any time and from time to time before maturity at the redemption price set forth in the global note representing the outstanding series of senior notes. In February 2004, the Company issued senior notes with an aggregate principal amount of $475.0 million at a 0.61% discount, which bear interest at 6.75% per year and are payable in a single installment due February 2034. Interest is payable semi-annually. These senior notes are not redeemable prior to maturity. In December 2016, the Company completed a cash tender offer and purchased $100.0 million in aggregate principal amount of such senior notes. 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 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 our commercial paper program or for general corporate purposes. As of June 30, 2019, no borrowings have been made under the Credit facility, $441.0 million was available under the Credit Facility and $9.0 million letters of credit were outstanding. Interest Rate Derivatives In March 2018, the Company exercised a series of derivative transactions it had entered into in 2017 to hedge the interest rate risk related to expected borrowing to finance the TWG acquisition. The Company determined that the derivatives qualified for hedge accounting as effective cash flow hedges and recognized a deferred gain of $26.7 million upon settlement that was reported through other comprehensive income. The deferred gain is being recognized as a reduction in interest expense related to the 2023 Senior Notes, the 2028 Senior Notes and the Subordinated Notes on an effective yield basis. The amortization of the deferred gain for the three and six months ended June 30, 2019 was $0.8 million and $1.5 million , respectively. The amortization of the deferred gain for the three and six months ended June 30, 2018 was $0.9 million . The remaining deferred gain as of June 30, 2019 was $23.0 million . Additionally, the Company expensed $8.6 million of the premium paid for the derivatives as a component of interest expense for the six months ended June 30, 2018. In March 2018, the Company entered into a three-year interest rate swap under which the Company pays interest on $150.0 million of the 2021 Senior Notes at a fixed rate of 2.72% to the counterparty who in return pays the Company a variable rate indexed to the three-month LIBOR rate. The Company determined that the swap qualifies for hedge accounting as an effective cash flow hedge.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at March 31, 2019 $ (365.4 ) $ 549.9 $ 18.1 $ 14.9 $ (114.1 ) $ 103.4 Change in accumulated other comprehensive (loss) income before reclassifications (1.2 ) 233.1 (2.3 ) 0.7 — 230.3 Amounts reclassified from accumulated other comprehensive (loss) income — (4.6 ) (0.6 ) — 0.2 (5.0 ) Net current-period other comprehensive (loss) income (1.2 ) 228.5 (2.9 ) 0.7 0.2 225.3 Balance at June 30, 2019 $ (366.6 ) $ 778.4 $ 15.2 $ 15.6 $ (113.9 ) $ 328.7 Three Months Ended June 30, 2018 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at March 31, 2018 $ (272.3 ) $ 372.1 $ 21.1 $ 14.4 $ (83.6 ) $ 51.7 Change in accumulated other comprehensive (loss) income before reclassifications (83.1 ) (110.6 ) 0.5 (1.4 ) — (194.6 ) Amounts reclassified from accumulated other comprehensive (loss) income — 4.7 (0.7 ) — 1.0 5.0 Net current-period other comprehensive (loss) income (83.1 ) (105.9 ) (0.2 ) (1.4 ) 1.0 (189.6 ) Balance at June 30, 2018 $ (355.4 ) $ 266.2 $ 20.9 $ 13.0 $ (82.6 ) $ (137.9 ) Six Months Ended June 30, 2019 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2018 $ (375.6 ) $ 301.0 $ 18.4 $ 15.1 $ (114.3 ) $ (155.4 ) Change in accumulated other comprehensive income (loss) before reclassifications 9.0 480.4 (2.0 ) 0.5 — 487.9 Amounts reclassified from accumulated other comprehensive income (loss) — (3.0 ) (1.2 ) — 0.4 (3.8 ) Net current-period other comprehensive income (loss) 9.0 477.4 (3.2 ) 0.5 0.4 484.1 Balance at June 30, 2019 $ (366.6 ) $ 778.4 $ 15.2 $ 15.6 $ (113.9 ) $ 328.7 Six Months Ended June 30, 2018 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2017 $ (281.5 ) $ 581.2 $ — $ 17.9 $ (83.6 ) $ 234.0 Change in accumulated other comprehensive (loss) income before reclassifications (73.9 ) (288.5 ) 21.6 (4.9 ) — (345.7 ) Amounts reclassified from accumulated other comprehensive (loss) income — 7.4 (0.7 ) — 1.0 7.7 Net current-period other comprehensive (loss) income (73.9 ) (281.1 ) 20.9 (4.9 ) 1.0 (338.0 ) Cumulative effect of change in accounting principles (1) — (33.9 ) — — — (33.9 ) Balance at June 30, 2018 $ (355.4 ) $ 266.2 $ 20.9 $ 13.0 $ (82.6 ) $ (137.9 ) (1) See Note 3 for additional information. The following tables summarize the reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2019 and 2018: Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the statement where net income is presented Three Months Ended June 30, 2019 2018 Net unrealized (gains) losses on securities $ (5.9 ) $ 6.0 Net realized gains on investments, excluding other-than-temporary impairment losses 1.3 (1.3 ) Provision for income taxes $ (4.6 ) $ 4.7 Net of tax Unrealized gains on derivative transactions $ (0.8 ) $ (0.9 ) Interest Expense 0.2 0.2 Provision for income taxes $ (0.6 ) $ (0.7 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 1.2 (1) (0.1 ) (0.2 ) Provision for income taxes $ 0.2 $ 1.0 Net of tax Total reclassifications for the period $ (5.0 ) $ 5.0 Net of tax Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the statement where net income is presented Six Months Ended June 30, 2019 2018 Net unrealized (gains) losses on securities $ (3.8 ) $ 9.4 Net realized gains on investments, excluding other-than-temporary impairment losses 0.8 (2.0 ) Provision for income taxes $ (3.0 ) $ 7.4 Net of tax Unrealized gains on derivative transactions $ (1.5 ) $ (0.9 ) Interest Expense 0.3 0.2 Provision for income taxes $ (1.2 ) $ (0.7 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.6 $ 1.2 (1) (0.2 ) (0.2 ) Provision for income taxes $ 0.4 $ 1.0 Net of tax Total reclassifications for the period $ (3.8 ) $ 7.7 Net of tax (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 16 for additional information.

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation Under the Assurant, Inc. 2017 Long-Term Equity Incentive Plan (“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 (“SARs”), 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 and six months ended June 30, 2019 and 2018: Three Months Ended Six Months Ended 2019 2018 2019 2018 RSU compensation expense $ 7.4 $ 8.7 $ 14.4 $ 13.8 Income tax benefit (1.4 ) (1.5 ) (2.7 ) (2.3 ) RSU compensation expense, net of tax $ 6.0 $ 7.2 $ 11.7 $ 11.5 RSUs granted 31,554 32,330 225,396 421,829 Weighted average grant date fair value per unit $ 96.18 $ 89.56 $ 97.56 $ 90.64 Total fair value of vested RSUs $ 5.0 $ 2.6 $ 26.8 $ 18.8 As of June 30, 2019, there was $31.2 million of unrecognized compensation cost related to outstanding RSUs. That cost is expected to be recognized over a weighted-average period of 1.3 years. Performance Share Units The following table shows a summary of PSU activity during the three and six months ended June 30, 2019 and 2018: Three Months Ended Six Months Ended 2019 2018 2019 2018 PSU compensation expense $ 6.6 $ 3.1 $ 10.8 $ 7.3 Income tax benefit (0.9 ) (0.4 ) (1.5 ) (1.3 ) PSU compensation expense, net of tax $ 5.7 $ 2.7 $ 9.3 $ 6.0 PSUs granted — — 246,219 — Weighted average grant date fair value per unit $ — $ — $ 105.23 $ — Total fair value of vested PSUs $ — $ 25.6 $ 17.7 $ 25.6 As of March 31, 2019, there was $38.2 million of unrecognized compensation cost related to outstanding PSUs. That cost is expected to be recognized over a weighted-average period of 1.3 years.

Equity Transactions

Equity Transactions	6 Months Ended
	Jun. 30, 2019
Class of Stock Disclosures [Abstract]
Equity Transactions	Equity Transactions Stock Repurchase During the six months ended June 30, 2019, the Company repurchased 1,037,262 shares of the Company’s outstanding common stock at a cost of $100.7 million , exclusive of commissions, leaving $660.5 million remaining under the total repurchase authorizations as of June 30, 2019. There were no share repurchases during the six months ended June 30, 2018. 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. Issuance of Mandatory Convertible Preferred Stock In March 2018, the Company issued 2,875,000 shares of the MCPS 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. Refer to Note 11 for further details on the use of proceeds from this offering. Each outstanding share of MCPS will convert automatically on March 15, 2021 into between 0.9365 (the “minimum conversion rate”) and 1.1239 shares of common stock, subject to customary anti-dilution adjustments. At any time prior to March 2021, holders may elect to convert each share of MCPS into shares of common stock at the minimum conversion rate or in the event of a fundamental change at the specified rates as defined in the Certificate of Designations of the MCPS. Dividends on our MCPS will be payable on a cumulative basis when, as and if declared, at an annual rate of 6.50% of the liquidation preference of $100.00 per share. The Company may pay declared dividends in cash or, subject to certain limitations, in shares of the Company’s common stock, or in any combination of cash and shares of the Company’s common stock quarterly, commencing in June 2018 and ending in March 2021. No dividend or distribution may be declared or paid on common stock or any other class or series of junior stock, and no common stock or any other class or series of junior stock or parity stock may be purchased, redeemed or otherwise acquired for consideration unless all accumulated and unpaid dividends on the MCPS for all preceding dividend periods have been declared and paid in full, subject to certain limited exceptions. The Company paid preferred stock dividends of $4.6 million and $9.3 million for the three and six months ended June 30, 2019, respectively. The Company paid preferred stock dividends of $4.8 million

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2019
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 earnings per common share (“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 ESPP using the treasury stock method; and (2) common shares issuable upon conversion of the MCPS using the if-converted method. Refer to Notes 13 and 14 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 Six Months Ended 2019 2018 2019 2018 Numerator Net income attributable to stockholders $ 144.1 $ 67.0 $ 309.8 $ 173.0 Less: Preferred stock dividends (4.6 ) (4.8 ) (9.3 ) (4.8 ) Net income attributable to common stockholders 139.5 62.2 300.5 168.2 Less: Common stock dividends paid (38.3 ) (30.9 ) (75.7 ) (60.6 ) Undistributed earnings $ 101.2 $ 31.3 $ 224.8 $ 107.6 Denominator Weighted average common shares outstanding used in basic earnings per common share calculations 62,222,090 57,060,313 62,407,429 55,125,584 Incremental common shares from: PSUs 114,502 163,596 172,321 217,455 ESPP 42,642 40,499 42,642 40,499 MCPS 2,909,213 — 2,938,538 1,889,890 Weighted average common shares used in diluted earnings per common share calculations 65,288,447 57,264,408 65,560,930 57,273,428 Earnings per common share - Basic Distributed earnings $ 0.62 $ 0.54 $ 1.21 $ 1.10 Undistributed earnings 1.62 0.55 3.61 1.95 Net income attributable to common stockholders $ 2.24 $ 1.09 $ 4.82 $ 3.05 Earnings per common share - Diluted Distributed earnings $ 0.59 $ 0.54 $ 1.16 $ 1.06 Undistributed earnings 1.62 0.55 3.57 1.96 Net income attributable to common stockholders $ 2.21 $ 1.09 $ 4.73 $ 3.02 Average PSUs totaling 95,899 and 4,171 for the three months ended June 30, 2019 and 2018, respectively, and 137,588 and 4,171 for the six months ended June 30, 2019 and 2018, respectively, were anti-dilutive and thus not included in the computation of diluted EPS under the treasury stock method. Average MCPS totaling 3,056,700

Retirement and Other Employee B

Retirement and Other Employee Benefits	6 Months Ended
	Jun. 30, 2019
Defined Benefit Plan [Abstract]
Retirement and Other Employee Benefits	Retirement and Other Employee Benefits The Company and its subsidiaries participate in a non-contributory, qualified defined benefit pension plan (“Assurant Pension Plan”) covering substantially all employees. The Company also has various non-contributory, non-qualified supplemental plans covering certain employees including the Assurant Executive Pension Plan and the Assurant Supplement 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. The following tables present the components of net periodic benefit cost for the Plans for the three and six months ended June 30, 2019 and 2018: Qualified Pension Benefits Unfunded Non-qualified Pension Benefits Retirement Health Benefits For the Three Months Ended June 30, For the Three Months Ended June 30, For the Three Months Ended June 30, 2019 2018 2019 2018 2019 2018 Interest cost $ 6.6 $ 5.8 $ 0.7 $ 0.7 $ 0.9 $ 0.9 Expected return on plan assets (9.0 ) (9.1 ) — — (0.5 ) (0.6 ) Amortization of net loss — 0.2 0.3 0.3 — — Net periodic benefit cost $ (2.4 ) $ (3.1 ) $ 1.0 $ 1.0 $ 0.4 $ 0.3 Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Six Months Ended June 30, For the Six Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 2019 2018 Interest cost $ 13.1 $ 11.6 $ 1.4 $ 1.4 $ 1.8 $ 1.7 Expected return on plan assets (18.0 ) (18.2 ) — — (0.9 ) (1.1 ) Amortization of net loss — 0.4 0.6 0.8 — — Net periodic benefit cost $ (4.9 ) $ (6.2 ) $ 2.0 $ 2.2 $ 0.9 $ 0.6 The Assurant Pension Plan funded status was $63.5 million at June 30, 2019 and $65.1 million at December 31, 2018 (based on the fair value of the assets compared to the accumulated benefit obligation). This equates to a 109% and 110% funded status at June 30, 2019 and December 31, 2018, respectively. During the first six months of 2019, no cash was contributed to the Assurant Pension Plan. Due to the Assurant Pension Plan’s current funded status, no

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
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 $12.1 million and $13.2 million of letters of credit outstanding as of June 30, 2019 and December 31, 2018, 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. In particular, the Company is a defendant in class actions in a number of jurisdictions regarding its Lender-placed Insurance programs. These cases assert a variety of claims under a number of legal theories. The plaintiffs typically seek premium refunds and other relief. The Company continues to defend itself vigorously in these class actions. 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)	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 and for the three and six months ended June 30, 2019 and 2018 is unaudited. In the opinion of management, the interim data includes all adjustments, consisting only of normal recurring 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. Operating results for the three and six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. The accompanying unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Lease accounting: On January 1, 2019, the Company adopted the new lease guidance on a modified retrospective basis and therefore did not restate comparative periods. The new guidance requires that entities recognize assets and liabilities associated with leases on the balance sheet and disclose key information about leasing arrangements. The Company and its subsidiaries lease office space and equipment under operating lease arrangements for which the Company is the lessee. Therefore, the primary change at the time of adoption involved the recognition of right-of-use assets and lease liabilities related to operating leases with terms in excess of 12 months in which the Company is the lessee. Upon adoption, the Company elected the package of practical expedients permitted under the transition guidance, which allowed the carryforward of 1) historical lease classifications, 2) the prior assessment of whether a contract is or contains a lease, and 3) initial direct costs for any leases that existed prior to adoption. As of January 1, 2019, the new lease liability and right-of-use asset was $85.3 million and $78.0 million , respectively. Deferred rent liability of $7.3 million , which was required under the previous guidance, was reversed. There was an immaterial impact on equity upon adoption. As of June 30, 2019, the lease liability and right-of-use asset was $84.7 million and $76.7 million , respectively. These balances are included in accounts payable and other liabilities and other assets, respectively, in the consolidated balance sheets. For the three and six months ended June 30, 2019, the operating lease cost recognized for leases with terms in excess of 12 months was $5.6 million and $11.4 million , respectively, and related cash outflows reducing the lease liability was $5.5 million and $10.6 million , respectively. At June 30, 2019, the weighted average remaining lease term and discount rate was 6.7 years and 4.5% , respectively. Not Yet Adopted Measurement of credit losses on financial instruments held at amortized cost (“CECL”) : In June 2016, the Financial Accounting Standards Board (“FASB”) issued amended guidance on reporting credit losses for assets held at amortized cost and available for sale debt securities. For assets held at amortized cost, the amended guidance eliminates the probable recognition threshold and instead requires an entity to reflect the current estimate of all expected credit losses. For available for sale debt securities, credit losses will be measured in a manner similar to current accounting requirements; however, the amended guidance requires that credit losses be presented as an allowance rather than as a permanent impairment. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The Company expects to adopt the amended guidance on its effective date of January 1, 2020. The Company is evaluating the requirements of this amended guidance and the potential impact on the Company’s financial position and results of operations. While the Company expects an increase in its allowances for credit losses related to financial assets within scope of the standard, principally reinsurance receivables and commercial mortgage loans on real estate, the amount of the allowance will be dependent on the asset composition and economic conditions at that time of adoption. Financial Instruments — Credit Losses: Targeted Transition Relief: In May 2019, the FASB issued guidance which provides transition relief for entities adopting CECL. The transition relief will allow companies to irrevocably elect, upon adoption of CECL, the fair value option on financial instruments that were previously measured at amortized cost basis. The fair value option election does not apply to held-to-maturity debt securities. Entities are required to make this election on an instrument-by-instrument basis. The effective date of the guidance will be the same as the effective date for CECL. An entity may early adopt the guidance in any interim period after its issuance if the entity has adopted CECL. The transition amendments should be applied on a modified-retrospective basis by means of a cumulative-effect adjustment to the opening balance of retained earnings balance in the statement of financial position as of the date that an entity adopted the amendments in CECL. The Company is evaluating the cost and benefit of the transition relief from this guidance in its overall adoption of the guidance under CECL and the potential impact on the Company’s financial position and results of operations. Customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract : In August 2018, the FASB issued guidance aligning the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. For these arrangements, the guidance also limits the period to expense capitalized implementation costs based on the term of the hosting agreement, including the noncancellable period of the arrangement plus periods covered by options to extend the arrangement that are reasonably certain of exercise. The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments. The guidance is effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The guidance is required to be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is evaluating the requirements of this guidance and the potential impact on the Company’s financial position and results of operations. 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 an 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. For public business entities, the guidance is effective for fiscal years beginning after December 15, 2020, 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. In July 2019, the FASB voted for a proposal to extend the effective date of this guidance. If adopted, the proposal would extend the effective date for public business entities that are SEC filers to fiscal years beginning after December 15, 2021 (with early adoption permitted).

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	Assets acquired and (liabilities) assumed Fixed maturity securities available for sale $ 2,268.8 Equity securities 49.4 Short-term investments 165.5 Other investments 100.9 Cash and cash equivalents 380.1 Premiums and accounts receivable, net 286.2 Reinsurance recoverables 1,908.7 Accrued investment income 31.6 Property and equipment 15.4 Value of business acquired 3,973.0 Other intangible assets 459.7 Other assets 200.0 Unearned premiums and contract fees (7,512.6 ) Claims and benefits payable (419.9 ) Commissions payable (106.8 ) Reinsurance balances payable (186.1 ) Funds held under reinsurance (202.2 ) Accounts payable and other liabilities (381.7 ) Non-controlling interest (1.8 ) Total identifiable net assets acquired 1,028.2 Goodwill 1,438.1 Total acquisition consideration $ 2,466.3
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table shows the purchase price allocation to value of business acquired (“VOBA”) and other intangible assets, including the effect of measurement period adjustments to provisional estimates as described above. Amount Value of business acquired (1) $ 3,973.0 Finite life (1): Customer related intangibles (distribution network) $ 390.3 Technology based intangibles 57.8 Total finite life other intangible assets 448.1 Indefinite life: Contract based intangibles 11.6 Total other intangible assets $ 459.7 (1) Refer to future estimated amortization table below for the amortization pattern of VOBA and other intangible assets with finite lives.
Schedule Of Future Amortization Expense Of VOBA And Intangible Assets Acquired	At June 30, 2019, the estimated amortization of VOBA and other intangible assets with finite lives related to TWG for the remainder of 2019, the next five years and thereafter is as follows: Period VOBA Other Intangible Assets (with Finite Lives) July 1 - December 31, 2019 $ 503.9 $ 9.5 2020 812.7 26.1 2021 570.6 31.0 2022 350.8 34.9 2023 203.7 36.2 2024 91.7 36.6 Thereafter 7.5 254.1 Total $ 2,540.9 $ 428.4

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Financial Information by Segment	The following tables summarize selected financial information by segment: Three Months Ended June 30, 2019 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 471.8 $ 1,545.5 $ 15.4 $ — $ 2,032.7 Fees and other income 38.3 263.6 34.2 — 336.1 Net investment income 18.8 56.5 70.6 8.3 154.2 Net realized gains on investments — — — 17.8 17.8 Amortization of deferred gains on disposal of businesses — — — 4.7 4.7 Total revenues 528.9 1,865.6 120.2 30.8 2,545.5 Benefits, losses and expenses Policyholder benefits 207.8 412.9 66.2 0.1 687.0 Amortization of deferred acquisition costs and value of business acquired 57.5 740.7 17.6 — 815.8 Underwriting, general and administrative expenses (1) 173.3 570.2 14.7 74.7 832.9 Interest expense — — — 26.5 26.5 Total benefits, losses and expenses 438.6 1,723.8 98.5 101.3 2,362.2 Segment income (loss) before provision (benefit) for income tax 90.3 141.8 21.7 (70.5 ) 183.3 Provision (benefit) for income taxes 18.8 32.5 4.8 (15.4 ) 40.7 Segment income (loss) after taxes 71.5 109.3 16.9 (55.1 ) 142.6 Less: Net loss attributable to non-controlling interests — — — 1.5 1.5 Net income (loss) attributable to stockholders 71.5 109.3 16.9 (53.6 ) 144.1 Less: Preferred stock dividends — — — (4.6 ) (4.6 ) Net income (loss) attributable to common stockholders $ 71.5 $ 109.3 $ 16.9 $ (58.2 ) $ 139.5 As of June 30, 2019 Segment assets: $ 4,029.6 $ 22,113.9 $ 7,264.6 $ 9,731.4 $ 43,139.5 (1) Corporate and Other includes a $14.6 million impairment of certain intangible assets from the acquisition of Green Tree Insurance Agency (“Green Tree”) as a result of recent developments related to the financial status of a business partner providing new and renewal business to Green Tree. Three Months Ended June 30, 2018 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 449.7 $ 874.3 $ 14.2 $ 0.1 $ 1,338.3 Fees and other income 92.8 227.9 32.7 0.8 354.2 Net investment income 15.9 36.6 67.9 15.2 135.6 Net realized losses on investments — — — (11.4 ) (11.4 ) Amortization of deferred gains on disposal of businesses — — — 15.0 15.0 Total revenues 558.4 1,138.8 114.8 19.7 1,831.7 Benefits, losses and expenses Policyholder benefits 187.2 239.3 65.0 (0.9 ) 490.6 Amortization of deferred acquisition costs and value of business acquired 50.4 395.6 17.2 — 463.2 Underwriting, general and administrative expenses 229.3 419.6 13.8 110.9 773.6 Interest expense — — — 26.0 26.0 Total benefits, losses and expenses 466.9 1,054.5 96.0 136.0 1,753.4 Segment income (loss) before provision (benefit) for income tax 91.5 84.3 18.8 (116.3 ) 78.3 Provision (benefit) for income taxes 18.9 16.2 4.1 (27.9 ) 11.3 Segment income (loss) after taxes 72.6 68.1 14.7 (88.4 ) 67.0 Less: Preferred stock dividends — — — (4.8 ) (4.8 ) Net income (loss) attributable to common stockholders $ 72.6 $ 68.1 $ 14.7 $ (93.2 ) $ 62.2 Six Months Ended June 30, 2019 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 931.9 $ 2,974.0 $ 31.2 $ — $ 3,937.1 Fees and other income 78.2 516.7 67.5 2.0 664.4 Net investment income 44.2 115.4 139.7 21.2 320.5 Net realized gains on investments — — — 46.6 46.6 Amortization of deferred gains on disposal of businesses — — — 12.5 12.5 Total revenues 1,054.3 3,606.1 238.4 82.3 4,981.1 Benefits, losses and expenses Policyholder benefits 406.7 760.1 134.8 0.1 1,301.7 Amortization of deferred acquisition costs and value of business acquired 111.4 1,446.5 35.2 — 1,593.1 Underwriting, general and administrative expenses (1) 354.0 1,126.0 31.6 121.4 1,633.0 Interest expense — — — 53.0 53.0 Total benefits, losses and expenses 872.1 3,332.6 201.6 174.5 4,580.8 Segment income (loss) before provision (benefit) for income tax 182.2 273.5 36.8 (92.2 ) 400.3 Provision (benefit) for income taxes 38.0 63.6 8.1 (20.6 ) 89.1 Segment income (loss) after taxes 144.2 209.9 28.7 (71.6 ) 311.2 Less: Net income attributable to non-controlling interests — — — (1.4 ) (1.4 ) Net income (loss) attributable to stockholders 144.2 209.9 28.7 (73.0 ) 309.8 Less: Preferred stock dividends — — — (9.3 ) (9.3 ) Net income (loss) attributable to common stockholders $ 144.2 $ 209.9 $ 28.7 $ (82.3 ) $ 300.5 (1) Corporate and Other includes a $14.6 million impairment of certain intangible assets from the acquisition of Green Tree as a result of recent developments related to the financial status of a business partner providing new and renewal business to Green Tree. Six Months Ended June 30, 2018 Global Housing Global Lifestyle Global Preneed Corporate and Other Consolidated Revenues Net earned premiums $ 886.1 $ 1,547.9 $ 28.8 $ 0.4 $ 2,463.2 Fees and other income 179.5 472.8 64.3 2.1 718.7 Net investment income 36.1 68.7 133.7 27.3 265.8 Net realized losses on investments — — — (10.9 ) (10.9 ) Amortization of deferred gains on disposal of businesses — — — 33.5 33.5 Total revenues 1,101.7 2,089.4 226.8 52.4 3,470.3 Benefits, losses and expenses Policyholder benefits 356.3 420.9 131.7 (3.7 ) 905.2 Amortization of deferred acquisition costs and value of business acquired 100.0 675.9 33.7 — 809.6 Underwriting, general and administrative expenses 464.2 835.4 30.0 163.6 1,493.2 Interest expense — — — 47.5 47.5 Total benefits, losses and expenses 920.5 1,932.2 195.4 207.4 3,255.5 Segment income (loss) before provision (benefit) for income tax 181.2 157.2 31.4 (155.0 ) 214.8 Provision (benefit) for income taxes 37.4 33.3 6.9 (35.8 ) 41.8 Segment income (loss) after taxes 143.8 123.9 24.5 (119.2 ) 173.0 Less: Preferred stock dividends — — — (4.8 ) (4.8 ) Net income (loss) attributable to common stockholders $ 143.8 $ 123.9 $ 24.5 $ (124.0 ) $ 168.2

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI	The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and other-than-temporary impairment (“OTTI”) included within AOCI of the Company’s fixed maturity securities as of the dates indicated: June 30, 2019 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (1) Fixed maturity securities: U.S. government and government agencies and authorities $ 225.0 $ 6.1 $ (0.1 ) $ 231.0 $ — States, municipalities and political subdivisions 236.4 26.2 — 262.6 — Foreign governments 878.7 102.5 (0.1 ) 981.1 — Asset-backed 517.1 1.5 (2.2 ) 516.4 — Commercial mortgage-backed 222.8 10.4 (0.8 ) 232.4 — Residential mortgage-backed 1,212.5 52.0 (2.1 ) 1,262.4 4.2 U.S. corporate 5,684.6 690.1 (3.7 ) 6,371.0 15.5 Foreign corporate 2,130.6 242.1 (0.8 ) 2,371.9 — Total fixed maturity securities $ 11,107.7 $ 1,130.9 $ (9.8 ) $ 12,228.8 $ 19.7 December 31, 2018 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (1) Fixed maturity securities: U.S. government and government agencies and authorities $ 381.4 $ 4.4 $ (1.2 ) $ 384.6 $ — States, municipalities and political subdivisions 238.9 17.6 (0.3 ) 256.2 — Foreign governments 856.3 58.8 (3.0 ) 912.1 — Asset-backed 513.6 0.5 (9.6 ) 504.5 — Commercial mortgage-backed 79.1 2.2 (1.6 ) 79.7 — Residential mortgage-backed 1,399.1 21.5 (14.8 ) 1,405.8 5.0 U.S. corporate 5,337.0 315.7 (59.7 ) 5,593.0 14.1 Foreign corporate 2,028.6 110.7 (18.1 ) 2,121.2 — Total fixed maturity securities $ 10,834.0 $ 531.4 $ (108.3 ) $ 11,257.1 $ 19.1 (1) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
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 June 30, 2019 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 Amortized Cost Fair Value Due in one year or less $ 330.5 $ 332.6 Due after one year through five years 2,553.4 2,638.1 Due after five years through ten years 2,478.9 2,673.6 Due after ten years 3,792.5 4,573.3 Total 9,155.3 10,217.6 Asset-backed 517.1 516.4 Commercial mortgage-backed 222.8 232.4 Residential mortgage-backed 1,212.5 1,262.4 Total $ 11,107.7 $ 12,228.8
Net Realized Gains (Losses), Including Other-Than-Temporary Impairments	The following table sets forth the net realized gains (losses), including OTTI, recognized in the statement of operations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 8.0 $ (7.6 ) $ 7.7 $ (10.2 ) Equity securities (1) 7.0 (5.9 ) 36.9 (3.7 ) Other investments 5.2 1.2 5.1 2.5 Consolidated investment entities (2) (1.8 ) 0.9 (2.2 ) 0.5 Total net realized gains (losses) related to sales and other 18.4 (11.4 ) 47.5 (10.9 ) Net realized losses related to other-than-temporary impairments: Fixed maturity securities (0.6 ) — (0.9 ) — Total net realized gains (losses) $ 17.8 $ (11.4 ) $ 46.6 $ (10.9 ) (1) Six months ended June 30, 2019 and 2018 includes $10.4 million and $7.8 million , respectively, of gains on equity investment holdings accounted for under the measurement alternative. There were no changes in fair value recorded on equity investments holdings accounted for under the measurement alternative for the three months ended June 30, 2019 and 2018. (2)
Unrealized Gains on Equity Securities	The following table sets forth the portion of unrealized gains (losses) related to equity securities during the three and six months ended March 31, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Net gains (losses) recognized on equity securities $ 7.0 $ (5.9 ) $ 36.9 $ (3.7 ) Less: Net realized gains (losses) related to sales of equity securities 0.1 2.3 (0.9 ) 3.7 Total net unrealized gains (losses) on equity securities held $ 6.9 $ (8.2 ) $ 37.8 $ (7.4 )
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]	The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 Less than 12 months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: U.S. government and government agencies and authorities $ — $ — $ 46.0 $ (0.1 ) $ 46.0 $ (0.1 ) Foreign governments 49.7 (0.1 ) — — 49.7 (0.1 ) Asset-backed 206.5 (1.9 ) 23.5 (0.3 ) 230.0 (2.2 ) Commercial mortgage-backed 1.8 (0.1 ) 18.3 (0.7 ) 20.1 (0.8 ) Residential mortgage-backed 11.5 (0.1 ) 148.6 (2.0 ) 160.1 (2.1 ) U.S. corporate 64.2 (1.6 ) 62.3 (2.1 ) 126.5 (3.7 ) Foreign corporate 32.5 (0.4 ) 22.3 (0.4 ) 54.8 (0.8 ) Total fixed maturity securities $ 366.2 $ (4.2 ) $ 321.0 $ (5.6 ) $ 687.2 $ (9.8 ) December 31, 2018 Less than 12 months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: U.S. government and government agencies and authorities $ 11.2 $ (0.1 ) $ 89.5 $ (1.1 ) $ 100.7 $ (1.2 ) States, municipalities and political subdivisions 31.5 (0.1 ) 3.1 (0.2 ) 34.6 (0.3 ) Foreign governments 136.4 (2.8 ) 9.2 (0.2 ) 145.6 (3.0 ) Asset-backed 370.6 (9.6 ) — — 370.6 (9.6 ) Commercial mortgage-backed 29.4 (0.7 ) 12.4 (0.9 ) 41.8 (1.6 ) Residential mortgage-backed 378.2 (3.7 ) 309.6 (11.1 ) 687.8 (14.8 ) U.S. corporate 1,860.4 (49.5 ) 173.1 (10.2 ) 2,033.5 (59.7 ) Foreign corporate 706.6 (12.9 ) 149.5 (5.2 ) 856.1 (18.1 ) Total fixed maturity securities $ 3,524.3 $ (79.4 ) $ 746.4 $ (28.9 ) $ 4,270.7 $ (108.3 )

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2019
Variable Interest Entities [Abstract]
Balances of assets and liabilities held by consolidated investment entities at fair value	The following table presents the Company’s fair value hierarchy for financial assets and liabilities held by consolidated investment entities measured at fair value on a recurring basis as of the dates indicated: June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 84.8 $ 84.8 (1) $ — $ — Corporate debt securities 1,838.9 — 1,838.9 — Real estate funds 138.2 — — 138.2 Total financial assets $ 2,061.9 $ 84.8 $ 1,838.9 $ 138.2 Financial Liabilities Collateralized loan obligation notes $ 1,616.5 $ — $ 1,616.5 $ — Total financial liabilities $ 1,616.5 $ — $ 1,616.5 $ — December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 62.6 $ 62.6 (1) $ — $ — Corporate debt securities 1,464.2 — 1,464.2 — Real estate funds 112.0 — — 112.0 Total financial assets $ 1,638.8 $ 62.6 $ 1,464.2 $ 112.0 Financial Liabilities Collateralized loan obligation notes $ 1,316.7 $ — $ 1,316.7 $ — Total financial liabilities $ 1,316.7 $ — $ 1,316.7 $ — (1) The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018. The amounts presented below for short-term investments, other investments, cash equivalents, other receivables, 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. June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 231.0 $ — $ 231.0 $ — States, municipalities and political subdivisions 262.6 — 262.6 — Foreign governments 981.1 0.5 980.6 — Asset-backed 516.4 — 514.8 1.6 Commercial mortgage-backed 232.4 — 192.8 39.6 Residential mortgage-backed 1,262.4 — 1,258.6 3.8 U.S. corporate 6,371.0 — 6,359.7 11.3 Foreign corporate 2,371.9 — 2,320.8 51.1 Equity securities: Mutual funds 44.2 44.2 — — Common stocks 18.8 18.1 0.7 — Non-redeemable preferred stocks 329.2 — 327.0 2.2 Short-term investments 321.9 216.1 (2) 105.8 — Other investments 235.0 70.6 (1) 163.9 (3) 0.5 (4) Cash equivalents 607.8 604.0 (2) 3.8 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 4.7 — 0.7 (5) 4.0 (5) Assets held in separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial assets $ 15,594.5 $ 2,574.9 $ 12,900.5 $ 119.1 Financial Liabilities Other liabilities $ 123.9 $ 70.6 (1) $ 0.2 (5) $ 53.1 (6) Liabilities related to separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial liabilities $ 1,923.0 $ 1,692.0 $ 177.9 $ 53.1 December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 384.6 $ — $ 384.6 $ — States, municipalities and political subdivisions 256.2 — 256.2 — Foreign governments 912.1 0.5 911.6 — Asset-backed 504.5 — 504.5 — Commercial mortgage-backed 79.7 — 40.8 38.9 Residential mortgage-backed 1,405.8 — 1,405.8 — U.S. corporate 5,593.0 — 5,580.3 12.7 Foreign corporate 2,121.2 — 2,071.7 49.5 Equity securities: Mutual funds 45.0 45.0 — — Common stocks 15.3 14.6 0.7 — Non-redeemable preferred stocks 318.5 — 316.3 2.2 Short-term investments 336.0 188.9 (2) 147.1 — Other investments 224.9 62.9 (1) 161.5 (3) 0.5 (4) Cash equivalents 527.7 523.6 (2) 4.1 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 2.6 — — 2.6 (5) Assets held in separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial assets $ 14,307.8 $ 2,235.6 $ 11,960.8 $ 111.4 Financial Liabilities Other liabilities $ 104.8 $ 62.9 (1) $ 0.7 (5) $ 41.2 (6) Liabilities related to separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial liabilities $ 1,680.5 $ 1,463.0 $ 176.3 $ 41.2 (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 fixed maturity securities and other derivatives. (5) Primarily includes other derivative assets and liabilities. (6) Primarily includes contingent consideration receivables/liabilities and derivative financial instruments.
Schedule of carrying values of level 3 assets	The following table summarizes the change in balance sheet carrying value associated with Level 3 assets held by consolidated investment entities measured at fair value during the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Balance, beginning of period $ 121.4 $ 86.8 $ 112.0 $ 84.7 Purchases 15.4 23.0 15.4 23.0 Sales — (6.8 ) — (6.8 ) Total income (loss) included in retained earnings 1.4 (0.5 ) 10.8 1.6 Balance, end of period $ 138.2 $ 102.5 $ 138.2 $ 102.5

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities	The following table presents the Company’s fair value hierarchy for financial assets and liabilities held by consolidated investment entities measured at fair value on a recurring basis as of the dates indicated: June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 84.8 $ 84.8 (1) $ — $ — Corporate debt securities 1,838.9 — 1,838.9 — Real estate funds 138.2 — — 138.2 Total financial assets $ 2,061.9 $ 84.8 $ 1,838.9 $ 138.2 Financial Liabilities Collateralized loan obligation notes $ 1,616.5 $ — $ 1,616.5 $ — Total financial liabilities $ 1,616.5 $ — $ 1,616.5 $ — December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Investments: Cash and cash equivalents $ 62.6 $ 62.6 (1) $ — $ — Corporate debt securities 1,464.2 — 1,464.2 — Real estate funds 112.0 — — 112.0 Total financial assets $ 1,638.8 $ 62.6 $ 1,464.2 $ 112.0 Financial Liabilities Collateralized loan obligation notes $ 1,316.7 $ — $ 1,316.7 $ — Total financial liabilities $ 1,316.7 $ — $ 1,316.7 $ — (1) The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018. The amounts presented below for short-term investments, other investments, cash equivalents, other receivables, 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. June 30, 2019 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 231.0 $ — $ 231.0 $ — States, municipalities and political subdivisions 262.6 — 262.6 — Foreign governments 981.1 0.5 980.6 — Asset-backed 516.4 — 514.8 1.6 Commercial mortgage-backed 232.4 — 192.8 39.6 Residential mortgage-backed 1,262.4 — 1,258.6 3.8 U.S. corporate 6,371.0 — 6,359.7 11.3 Foreign corporate 2,371.9 — 2,320.8 51.1 Equity securities: Mutual funds 44.2 44.2 — — Common stocks 18.8 18.1 0.7 — Non-redeemable preferred stocks 329.2 — 327.0 2.2 Short-term investments 321.9 216.1 (2) 105.8 — Other investments 235.0 70.6 (1) 163.9 (3) 0.5 (4) Cash equivalents 607.8 604.0 (2) 3.8 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 4.7 — 0.7 (5) 4.0 (5) Assets held in separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial assets $ 15,594.5 $ 2,574.9 $ 12,900.5 $ 119.1 Financial Liabilities Other liabilities $ 123.9 $ 70.6 (1) $ 0.2 (5) $ 53.1 (6) Liabilities related to separate accounts 1,799.1 1,621.4 (1) 177.7 (3) — Total financial liabilities $ 1,923.0 $ 1,692.0 $ 177.9 $ 53.1 December 31, 2018 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 384.6 $ — $ 384.6 $ — States, municipalities and political subdivisions 256.2 — 256.2 — Foreign governments 912.1 0.5 911.6 — Asset-backed 504.5 — 504.5 — Commercial mortgage-backed 79.7 — 40.8 38.9 Residential mortgage-backed 1,405.8 — 1,405.8 — U.S. corporate 5,593.0 — 5,580.3 12.7 Foreign corporate 2,121.2 — 2,071.7 49.5 Equity securities: Mutual funds 45.0 45.0 — — Common stocks 15.3 14.6 0.7 — Non-redeemable preferred stocks 318.5 — 316.3 2.2 Short-term investments 336.0 188.9 (2) 147.1 — Other investments 224.9 62.9 (1) 161.5 (3) 0.5 (4) Cash equivalents 527.7 523.6 (2) 4.1 (3) — Other receivables 5.0 — — 5.0 (6) Other assets 2.6 — — 2.6 (5) Assets held in separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial assets $ 14,307.8 $ 2,235.6 $ 11,960.8 $ 111.4 Financial Liabilities Other liabilities $ 104.8 $ 62.9 (1) $ 0.7 (5) $ 41.2 (6) Liabilities related to separate accounts 1,575.7 1,400.1 (1) 175.6 (3) — Total financial liabilities $ 1,680.5 $ 1,463.0 $ 176.3 $ 41.2 (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 fixed maturity securities and other derivatives. (5) Primarily includes other derivative assets and liabilities. (6) Primarily includes contingent consideration receivables/liabilities and derivative financial instruments.
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: June 30, 2019 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 783.1 $ 811.6 $ — $ — $ 811.6 Other investments 139.2 139.2 31.3 — 107.9 Other assets 36.9 36.9 — — 36.9 Total financial assets $ 959.2 $ 987.7 $ 31.3 $ — $ 956.4 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 564.4 $ 568.9 $ — $ — $ 568.9 Funds withheld under reinsurance 308.0 308.0 308.0 — — Debt 2,007.3 2,169.3 — 2,169.3 — Total financial liabilities $ 2,879.7 $ 3,046.2 $ 308.0 $ 2,169.3 $ 568.9 December 31, 2018 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 759.6 $ 735.1 $ — $ — $ 735.1 Other investments 124.9 124.9 33.9 — 91.0 Other assets 43.0 43.0 — — 43.0 Total financial assets $ 927.5 $ 903.0 $ 33.9 $ — $ 869.1 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 570.6 $ 556.8 $ — $ — $ 556.8 Funds withheld under reinsurance 272.0 272.0 272.0 — — Debt 2,006.0 2,058.7 — 2,058.7 — Total financial liabilities $ 2,848.6 $ 2,887.5 $ 272.0 $ 2,058.7 $ 556.8 (1) Only the fair value of the Company’s policy reserves for investment-type contracts (those without significant mortality or morbidity risk) are reflected in the table above.

Reserves (Tables)

Reserves (Tables)	6 Months Ended
	Jun. 30, 2019
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 Six Months Ended June 30, 2019 2018 Claims and benefits payable, at beginning of period $ 2,813.7 $ 3,782.2 Less: Reinsurance ceded and other (2,053.7 ) (3,193.3 ) Net claims and benefits payable, at beginning of period 760.0 588.9 Acquired reserves as of Acquisition Date (1) — 140.7 Incurred losses and loss adjustment expenses related to: Current year 1,339.4 940.3 Prior years (37.7 ) (30.6 ) Total incurred losses and loss adjustment expenses 1,301.7 909.7 Paid losses and loss adjustment expenses related to: Current year 882.9 624.6 Prior years 409.2 336.4 Total paid losses and loss adjustment expenses 1,292.1 961.0 Net claims and benefits payable, at end of period 769.6 678.3 Plus: Reinsurance ceded and other (2) 1,952.6 2,824.8 Claims and benefits payable, at end of period (2) (3) $ 2,722.2 $ 3,503.1 (1) Acquired reserves from TWG on the Acquisition Date include $419.9 million of gross claims and benefits payable, and $279.2 million of ceded claims and benefits payable. The reserve roll forward includes the activity of TWG from June 1, 2018 to June 30, 2018. (2) Includes reinsurance recoverables and claims and benefits payable of $83.2 million and $89.6 million as of June 30, 2019 and 2018, 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. (3) Claims and benefits payable and related reinsurance ceded were reduced by $730.0 million in December 2018 as result of the sale of Time Insurance Company, a legal entity associated with the previously exited Assurant Health business.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 and December 31, 2018: June 30, 2019 December 31, 2018 Principal Amount Carrying Value Floating Rate Senior Notes due March 2021 (1) $ 300.0 $ 298.4 $ 298.1 4.00% Senior Notes due March 2023 350.0 348.3 348.1 4.20% Senior Notes due September 2023 300.0 297.1 296.8 4.90% Senior Notes due March 2028 300.0 297.7 297.6 6.75% Senior Notes due February 2034 375.0 371.0 370.9 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 (2) 400.0 394.8 394.5 Total debt $ 2,007.3 $ 2,006.0 (1) Bears floating interest at a rate equal to three-month LIBOR plus 1.25% . (2) Bears a 7.00% annual interest rate from March 2018 to March 2028 and annual interest rate equal to three-month LIBOR plus 4.135% thereafter.
Schedule of Credit Rating Agencies interest rates	The following table details the increase in interest rate over the issuance rate by rating with the impact equal to the sum of the number of basis points next to such rating for a maximum increase of 200 basis points over the issuance rate: Rating Agencies Rating Levels Moody’s (1) S&P (1) Interest Rate Increase (2) 1 Ba1 BB+ 25 basis points 2 Ba2 BB 50 basis points 3 Ba3 BB- 75 basis points 4 B1 or below B+ or below 100 basis points (1) Including the equivalent ratings of any substitute rating agency. (2) Applies to each rating agency individually.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at March 31, 2019 $ (365.4 ) $ 549.9 $ 18.1 $ 14.9 $ (114.1 ) $ 103.4 Change in accumulated other comprehensive (loss) income before reclassifications (1.2 ) 233.1 (2.3 ) 0.7 — 230.3 Amounts reclassified from accumulated other comprehensive (loss) income — (4.6 ) (0.6 ) — 0.2 (5.0 ) Net current-period other comprehensive (loss) income (1.2 ) 228.5 (2.9 ) 0.7 0.2 225.3 Balance at June 30, 2019 $ (366.6 ) $ 778.4 $ 15.2 $ 15.6 $ (113.9 ) $ 328.7 Three Months Ended June 30, 2018 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at March 31, 2018 $ (272.3 ) $ 372.1 $ 21.1 $ 14.4 $ (83.6 ) $ 51.7 Change in accumulated other comprehensive (loss) income before reclassifications (83.1 ) (110.6 ) 0.5 (1.4 ) — (194.6 ) Amounts reclassified from accumulated other comprehensive (loss) income — 4.7 (0.7 ) — 1.0 5.0 Net current-period other comprehensive (loss) income (83.1 ) (105.9 ) (0.2 ) (1.4 ) 1.0 (189.6 ) Balance at June 30, 2018 $ (355.4 ) $ 266.2 $ 20.9 $ 13.0 $ (82.6 ) $ (137.9 ) Six Months Ended June 30, 2019 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2018 $ (375.6 ) $ 301.0 $ 18.4 $ 15.1 $ (114.3 ) $ (155.4 ) Change in accumulated other comprehensive income (loss) before reclassifications 9.0 480.4 (2.0 ) 0.5 — 487.9 Amounts reclassified from accumulated other comprehensive income (loss) — (3.0 ) (1.2 ) — 0.4 (3.8 ) Net current-period other comprehensive income (loss) 9.0 477.4 (3.2 ) 0.5 0.4 484.1 Balance at June 30, 2019 $ (366.6 ) $ 778.4 $ 15.2 $ 15.6 $ (113.9 ) $ 328.7 Six Months Ended June 30, 2018 Foreign currency translation adjustment Net unrealized gains on securities Net unrealized gains on derivative transactions OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2017 $ (281.5 ) $ 581.2 $ — $ 17.9 $ (83.6 ) $ 234.0 Change in accumulated other comprehensive (loss) income before reclassifications (73.9 ) (288.5 ) 21.6 (4.9 ) — (345.7 ) Amounts reclassified from accumulated other comprehensive (loss) income — 7.4 (0.7 ) — 1.0 7.7 Net current-period other comprehensive (loss) income (73.9 ) (281.1 ) 20.9 (4.9 ) 1.0 (338.0 ) Cumulative effect of change in accounting principles (1) — (33.9 ) — — — (33.9 ) Balance at June 30, 2018 $ (355.4 ) $ 266.2 $ 20.9 $ 13.0 $ (82.6 ) $ (137.9 ) (1) See Note 3 for additional information.
Reclassification out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2019 and 2018: Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the statement where net income is presented Three Months Ended June 30, 2019 2018 Net unrealized (gains) losses on securities $ (5.9 ) $ 6.0 Net realized gains on investments, excluding other-than-temporary impairment losses 1.3 (1.3 ) Provision for income taxes $ (4.6 ) $ 4.7 Net of tax Unrealized gains on derivative transactions $ (0.8 ) $ (0.9 ) Interest Expense 0.2 0.2 Provision for income taxes $ (0.6 ) $ (0.7 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 1.2 (1) (0.1 ) (0.2 ) Provision for income taxes $ 0.2 $ 1.0 Net of tax Total reclassifications for the period $ (5.0 ) $ 5.0 Net of tax Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the statement where net income is presented Six Months Ended June 30, 2019 2018 Net unrealized (gains) losses on securities $ (3.8 ) $ 9.4 Net realized gains on investments, excluding other-than-temporary impairment losses 0.8 (2.0 ) Provision for income taxes $ (3.0 ) $ 7.4 Net of tax Unrealized gains on derivative transactions $ (1.5 ) $ (0.9 ) Interest Expense 0.3 0.2 Provision for income taxes $ (1.2 ) $ (0.7 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.6 $ 1.2 (1) (0.2 ) (0.2 ) Provision for income taxes $ 0.4 $ 1.0 Net of tax Total reclassifications for the period $ (3.8 ) $ 7.7 Net of tax (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 16 for additional information.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Based Compensation Activity	The following table shows a summary of PSU activity during the three and six months ended June 30, 2019 and 2018: Three Months Ended Six Months Ended 2019 2018 2019 2018 PSU compensation expense $ 6.6 $ 3.1 $ 10.8 $ 7.3 Income tax benefit (0.9 ) (0.4 ) (1.5 ) (1.3 ) PSU compensation expense, net of tax $ 5.7 $ 2.7 $ 9.3 $ 6.0 PSUs granted — — 246,219 — Weighted average grant date fair value per unit $ — $ — $ 105.23 $ — Total fair value of vested PSUs $ — $ 25.6 $ 17.7 $ 25.6 The following table shows a summary of RSU activity during the three and six months ended June 30, 2019 and 2018: Three Months Ended Six Months Ended 2019 2018 2019 2018 RSU compensation expense $ 7.4 $ 8.7 $ 14.4 $ 13.8 Income tax benefit (1.4 ) (1.5 ) (2.7 ) (2.3 ) RSU compensation expense, net of tax $ 6.0 $ 7.2 $ 11.7 $ 11.5 RSUs granted 31,554 32,330 225,396 421,829 Weighted average grant date fair value per unit $ 96.18 $ 89.56 $ 97.56 $ 90.64 Total fair value of vested RSUs $ 5.0 $ 2.6 $ 26.8 $ 18.8

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2019
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 earnings per common share (“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 ESPP using the treasury stock method; and (2) common shares issuable upon conversion of the MCPS using the if-converted method. Refer to Notes 13 and 14 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 Six Months Ended 2019 2018 2019 2018 Numerator Net income attributable to stockholders $ 144.1 $ 67.0 $ 309.8 $ 173.0 Less: Preferred stock dividends (4.6 ) (4.8 ) (9.3 ) (4.8 ) Net income attributable to common stockholders 139.5 62.2 300.5 168.2 Less: Common stock dividends paid (38.3 ) (30.9 ) (75.7 ) (60.6 ) Undistributed earnings $ 101.2 $ 31.3 $ 224.8 $ 107.6 Denominator Weighted average common shares outstanding used in basic earnings per common share calculations 62,222,090 57,060,313 62,407,429 55,125,584 Incremental common shares from: PSUs 114,502 163,596 172,321 217,455 ESPP 42,642 40,499 42,642 40,499 MCPS 2,909,213 — 2,938,538 1,889,890 Weighted average common shares used in diluted earnings per common share calculations 65,288,447 57,264,408 65,560,930 57,273,428 Earnings per common share - Basic Distributed earnings $ 0.62 $ 0.54 $ 1.21 $ 1.10 Undistributed earnings 1.62 0.55 3.61 1.95 Net income attributable to common stockholders $ 2.24 $ 1.09 $ 4.82 $ 3.05 Earnings per common share - Diluted Distributed earnings $ 0.59 $ 0.54 $ 1.16 $ 1.06 Undistributed earnings 1.62 0.55 3.57 1.96 Net income attributable to common stockholders $ 2.21 $ 1.09 $ 4.73 $ 3.02

Retirement and Other Employee_2

Retirement and Other Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2019
Defined Benefit Plan [Abstract]
Components of Net Periodic Benefit Cost	The following tables present the components of net periodic benefit cost for the Plans for the three and six months ended June 30, 2019 and 2018: Qualified Pension Benefits Unfunded Non-qualified Pension Benefits Retirement Health Benefits For the Three Months Ended June 30, For the Three Months Ended June 30, For the Three Months Ended June 30, 2019 2018 2019 2018 2019 2018 Interest cost $ 6.6 $ 5.8 $ 0.7 $ 0.7 $ 0.9 $ 0.9 Expected return on plan assets (9.0 ) (9.1 ) — — (0.5 ) (0.6 ) Amortization of net loss — 0.2 0.3 0.3 — — Net periodic benefit cost $ (2.4 ) $ (3.1 ) $ 1.0 $ 1.0 $ 0.4 $ 0.3 Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Six Months Ended June 30, For the Six Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 2019 2018 Interest cost $ 13.1 $ 11.6 $ 1.4 $ 1.4 $ 1.8 $ 1.7 Expected return on plan assets (18.0 ) (18.2 ) — — (0.9 ) (1.1 ) Amortization of net loss — 0.4 0.6 0.8 — — Net periodic benefit cost $ (4.9 ) $ (6.2 ) $ 2.0 $ 2.2 $ 0.9 $ 0.6

Nature of Operations (Details)

Nature of Operations (Details)	6 Months Ended
	Jun. 30, 2019segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	3

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 84.7	$ 84.7
Operating lease, right-of-use asset	76.7	76.7
Operating lease, cost	5.6	11.4
Cash outflows reducing lease liability	$ 5.5	$ 10.6
Weighted average remaining lease term	6 years 8 months 12 days	6 years 8 months 12 days
Weighted average discount rate	4.50%	4.50%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability			$ 85.3
Operating lease, right-of-use asset			78
Deferred rent credit			$ 7.3

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($)	May 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,338,000,000		$ 2,338,000,000		$ 2,321,800,000
Claims and benefits payable		2,722,200,000	$ 3,503,100,000	2,722,200,000	$ 3,503,100,000	$ 2,813,700,000	$ 3,782,200,000
TWG Holdings Limited
Business Acquisition [Line Items]
Total acquisition consideration	$ 2,466,300,000
Aggregate cash consideration	894,900,000
Repayment of pre-existing TWG debt	595,900,000
Share issuance consideration	$ 975,500,000
Common stock shares issued to TWG equityholders	10,400,000
Goodwill				25,700,000
Goodwill	$ 1,438,100,000
Tax-deductible goodwill	0
Amortization of value of business acquired (VOBA)		294,000,000	34,200,000	592,400,000	34,200,000
Claims and benefits payable	$ 419,900,000
Amortization of intangible assets		$ 4,600,000	$ 1,400,000	$ 9,100,000	$ 1,400,000

Acquisitions - Fair Value of Ne

Acquisitions - Fair Value of Net Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	May 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 2,338	$ 2,321.8
TWG Holdings Limited
Business Acquisition [Line Items]
Fixed maturity securities available for sale	$ 2,268.8
Equity securities	49.4
Short-term investments	165.5
Other investments	100.9
Cash and cash equivalents	380.1
Premiums and accounts receivable, net	286.2
Reinsurance recoverables	1,908.7
Accrued investment income	31.6
Property and equipment	15.4
Value of business acquired	3,973
Other intangible assets	459.7
Other assets	200
Unearned premiums and contract fees	(7,512.6)
Claims and benefits payable	(419.9)
Commissions payable	(106.8)
Reinsurance balances payable	(186.1)
Funds held under reinsurance	(202.2)
Accounts payable and other liabilities	(381.7)
Non-controlling interest	(1.8)
Total identifiable net assets acquired	1,028.2
Goodwill	1,438.1
Total acquisition consideration	$ 2,466.3

Acquisitions - VOBA and Other I

Acquisitions - VOBA and Other Intangible Assets (Details) - TWG Holdings Limited $ in Millions	May 31, 2018USD ($)
Business Acquisition [Line Items]
Value of business acquired	$ 3,973
Amortization intangible assets	448.1
Indefinite-lived intangible assets	11.6
Other intangible assets	459.7
Customer related intangibles (distribution network)
Business Acquisition [Line Items]
Amortization intangible assets	390.3
Technology based intangibles
Business Acquisition [Line Items]
Amortization intangible assets	$ 57.8

Acquisitions - VOBA and Other_2

Acquisitions - VOBA and Other Intangible Assets Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract]
Total	$ 2,554.7	$ 3,157.8
TWG Holdings Limited
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract]
July 1 - December 31, 2019	503.9
2020	812.7
2021	570.6
2022	350.8
2023	203.7
2024	91.7
Thereafter	7.5
Total	2,540.9
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
July 1 - December 31, 2019	9.5
2020	26.1
2021	31
2022	34.9
2023	36.2
2024	36.6
Thereafter	254.1
Total	$ 428.4

Acquisitions - Acquisition-rela

Acquisitions - Acquisition-related Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Transaction costs	$ 0		$ 0
TWG Holdings Limited
Business Acquisition [Line Items]
Transaction costs, incurred to date			40,400,000
Integration costs, incurred to date			47,100,000
TWG Holdings Limited | Underwriting, general and administrative expense
Business Acquisition [Line Items]
Transaction costs		$ 24,800,000		$ 30,000,000
Integration costs	$ 6,200,000	$ 10,500,000	$ 16,600,000	$ 12,800,000

Segment Information (Financial

Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)reportable_segment	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment			4
Revenues
Net earned premiums	$ 2,032.7	$ 1,338.3	$ 3,937.1	$ 2,463.2
Fees and other income	336.1	354.2	664.4	718.7
Net investment income	154.2	135.6	320.5	265.8
Net realized gains on investments	17.8	(11.4)	46.6	(10.9)
Amortization of deferred gains on disposal of businesses	4.7	15	12.5	33.5
Total revenues	2,545.5	1,831.7	4,981.1	3,470.3
Benefits, losses and expenses
Policyholder benefits	687	490.6	1,301.7	905.2
Amortization of deferred acquisition costs and value of business acquired	815.8	463.2	1,593.1	809.6
Underwriting, general and administrative expenses	832.9	773.6	1,633	1,493.2
Interest expense	26.5	26	53	47.5
Total benefits, losses and expenses	2,362.2	1,753.4	4,580.8	3,255.5
Income before provision for income taxes	183.3	78.3	400.3	214.8
Provision (benefit) for income taxes	40.7	11.3	89.1	41.8
Net income	142.6	67	311.2	173
Less: Net loss (income) attributable to non-controlling interests	1.5	0	(1.4)	0
Net income attributable to stockholders	144.1	67	309.8	173
Less: Preferred stock dividends	(4.6)	(4.8)	(9.3)	(4.8)
Net income attributable to common stockholders	139.5	62.2	300.5	168.2
Segment assets	43,139.5		43,139.5		$ 41,089.3
Other intangible asset impairment			14.6	0
Global Housing
Revenues
Net earned premiums	471.8	449.7	931.9	886.1
Fees and other income	38.3	92.8	78.2	179.5
Net investment income	18.8	15.9	44.2	36.1
Net realized gains on investments	0	0	0	0
Amortization of deferred gains on disposal of businesses	0	0	0	0
Total revenues	528.9	558.4	1,054.3	1,101.7
Benefits, losses and expenses
Policyholder benefits	207.8	187.2	406.7	356.3
Amortization of deferred acquisition costs and value of business acquired	57.5	50.4	111.4	100
Underwriting, general and administrative expenses	173.3	229.3	354	464.2
Interest expense	0	0	0	0
Total benefits, losses and expenses	438.6	466.9	872.1	920.5
Income before provision for income taxes	90.3	91.5	182.2	181.2
Provision (benefit) for income taxes	18.8	18.9	38	37.4
Net income	71.5		144.2
Less: Net loss (income) attributable to non-controlling interests	0		0
Net income attributable to stockholders	71.5	72.6	144.2	143.8
Less: Preferred stock dividends	0	0	0	0
Net income attributable to common stockholders	71.5	72.6	144.2	143.8
Segment assets	4,029.6		4,029.6
Global Lifestyle
Revenues
Net earned premiums	1,545.5	874.3	2,974	1,547.9
Fees and other income	263.6	227.9	516.7	472.8
Net investment income	56.5	36.6	115.4	68.7
Net realized gains on investments	0	0	0	0
Amortization of deferred gains on disposal of businesses	0	0	0	0
Total revenues	1,865.6	1,138.8	3,606.1	2,089.4
Benefits, losses and expenses
Policyholder benefits	412.9	239.3	760.1	420.9
Amortization of deferred acquisition costs and value of business acquired	740.7	395.6	1,446.5	675.9
Underwriting, general and administrative expenses	570.2	419.6	1,126	835.4
Interest expense	0	0	0	0
Total benefits, losses and expenses	1,723.8	1,054.5	3,332.6	1,932.2
Income before provision for income taxes	141.8	84.3	273.5	157.2
Provision (benefit) for income taxes	32.5	16.2	63.6	33.3
Net income	109.3		209.9
Less: Net loss (income) attributable to non-controlling interests	0		0
Net income attributable to stockholders	109.3	68.1	209.9	123.9
Less: Preferred stock dividends	0	0	0	0
Net income attributable to common stockholders	109.3	68.1	209.9	123.9
Segment assets	22,113.9		22,113.9
Global Preneed
Revenues
Net earned premiums	15.4	14.2	31.2	28.8
Fees and other income	34.2	32.7	67.5	64.3
Net investment income	70.6	67.9	139.7	133.7
Net realized gains on investments	0	0	0	0
Amortization of deferred gains on disposal of businesses	0	0	0	0
Total revenues	120.2	114.8	238.4	226.8
Benefits, losses and expenses
Policyholder benefits	66.2	65	134.8	131.7
Amortization of deferred acquisition costs and value of business acquired	17.6	17.2	35.2	33.7
Underwriting, general and administrative expenses	14.7	13.8	31.6	30
Interest expense	0	0	0	0
Total benefits, losses and expenses	98.5	96	201.6	195.4
Income before provision for income taxes	21.7	18.8	36.8	31.4
Provision (benefit) for income taxes	4.8	4.1	8.1	6.9
Net income	16.9		28.7
Less: Net loss (income) attributable to non-controlling interests	0		0
Net income attributable to stockholders	16.9	14.7	28.7	24.5
Less: Preferred stock dividends	0	0	0	0
Net income attributable to common stockholders	16.9	14.7	28.7	24.5
Segment assets	7,264.6		7,264.6
Total Corporate and Other
Revenues
Net earned premiums	0	0.1	0	0.4
Fees and other income	0	0.8	2	2.1
Net investment income	8.3	15.2	21.2	27.3
Net realized gains on investments	17.8	(11.4)	46.6	(10.9)
Amortization of deferred gains on disposal of businesses	4.7	15	12.5	33.5
Total revenues	30.8	19.7	82.3	52.4
Benefits, losses and expenses
Policyholder benefits	0.1	(0.9)	0.1	(3.7)
Amortization of deferred acquisition costs and value of business acquired	0	0	0	0
Underwriting, general and administrative expenses	74.7	110.9	121.4	163.6
Interest expense	26.5	26	53	47.5
Total benefits, losses and expenses	101.3	136	174.5	207.4
Income before provision for income taxes	(70.5)	(116.3)	(92.2)	(155)
Provision (benefit) for income taxes	(15.4)	(27.9)	(20.6)	(35.8)
Net income	(55.1)		(71.6)
Less: Net loss (income) attributable to non-controlling interests	1.5		(1.4)
Net income attributable to stockholders	(53.6)	(88.4)	(73)	(119.2)
Less: Preferred stock dividends	(4.6)	(4.8)	(9.3)	(4.8)
Net income attributable to common stockholders	(58.2)	$ (93.2)	(82.3)	$ (124)
Segment assets	9,731.4		9,731.4
Green Tree Insurance Agency, Inc.
Benefits, losses and expenses
Other intangible asset impairment	$ 14.6		$ 14.6

Contract Revenues - Narrative (

Contract Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Upfront costs in connection with client contracts	$ 564.1		$ 564.1		$ 622.4
Global Housing
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	27.4	$ 84.2	57.6	$ 160.3
Global Lifestyle
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	218.2	$ 151.2	425.8	$ 324.8
Service contracts and sales
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	175		175		183.7
Unearned revenue from contracts with customers	93.4		93.4		88.7
Contract with customer, liability, unearned revenue	14.6		30.2
Upfront costs in connection with client contracts	$ 31		$ 31		$ 29

Investments - Amortized Cost, G

Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	$ 11,107.7	$ 10,834
Fixed maturity securities, fair value	12,228.8	11,257.1
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	11,107.7	10,834
Fixed maturity securities, gross unrealized gains	1,130.9	531.4
Fixed maturity securities, gross unrealized losses	(9.8)	(108.3)
Fixed maturity securities, fair value	12,228.8	11,257.1
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	19.7	19.1
Fixed maturity securities | U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	225	381.4
Fixed maturity securities, gross unrealized gains	6.1	4.4
Fixed maturity securities, gross unrealized losses	(0.1)	(1.2)
Fixed maturity securities, fair value	231	384.6
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	0	0
Fixed maturity securities | States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	236.4	238.9
Fixed maturity securities, gross unrealized gains	26.2	17.6
Fixed maturity securities, gross unrealized losses	0	(0.3)
Fixed maturity securities, fair value	262.6	256.2
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	0	0
Fixed maturity securities | Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	878.7	856.3
Fixed maturity securities, gross unrealized gains	102.5	58.8
Fixed maturity securities, gross unrealized losses	(0.1)	(3)
Fixed maturity securities, fair value	981.1	912.1
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	0	0
Fixed maturity securities | Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	517.1	513.6
Fixed maturity securities, gross unrealized gains	1.5	0.5
Fixed maturity securities, gross unrealized losses	(2.2)	(9.6)
Fixed maturity securities, fair value	516.4	504.5
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	0	0
Fixed maturity securities | Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	222.8	79.1
Fixed maturity securities, gross unrealized gains	10.4	2.2
Fixed maturity securities, gross unrealized losses	(0.8)	(1.6)
Fixed maturity securities, fair value	232.4	79.7
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	0	0
Fixed maturity securities | Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	1,212.5	1,399.1
Fixed maturity securities, gross unrealized gains	52	21.5
Fixed maturity securities, gross unrealized losses	(2.1)	(14.8)
Fixed maturity securities, fair value	1,262.4	1,405.8
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	4.2	5
Fixed maturity securities | U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	5,684.6	5,337
Fixed maturity securities, gross unrealized gains	690.1	315.7
Fixed maturity securities, gross unrealized losses	(3.7)	(59.7)
Fixed maturity securities, fair value	6,371	5,593
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	15.5	14.1
Fixed maturity securities | Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	2,130.6	2,028.6
Fixed maturity securities, gross unrealized gains	242.1	110.7
Fixed maturity securities, gross unrealized losses	(0.8)	(18.1)
Fixed maturity securities, fair value	2,371.9	2,121.2
Other-than-temporary impairment loss, debt securities, available-for-sale, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest	$ 0	$ 0

Investments - Narrative (Detail

Investments - Narrative (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)investmentstate	Dec. 31, 2018USD ($)investmentstate
Investment [Line Items]
Number of individual states exceeding overall investment portfolio exposure | state	0	0
Maximum individual state exposure	0.30%	0.40%
Advance refunded or escrowed-to-maturity securities	$ 59.2	$ 58.4
Percentage of revenue securities	56.00%	56.00%
Investment in securities	$ 12,228.8	$ 11,257.1
Percentage of securities representing gross unrealized losses	1.00%	3.00%
Percentage of gross unrealized losses in a continuous loss position less than twelve months	43.00%	73.00%
Individual securities comprising total gross unrealized losses | investment	332	2,642
Percentage of residential mortgage-backed holdings exposure to sub-prime mortgage collateral	35.00%
Europe | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Investment in securities	$ 809.4	$ 800.9
Unrealized gain (loss) on investments	$ 69.1	$ 27.7
Geographic Concentration Risk | Investments | Canada | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	57.00%	55.00%
Geographic Concentration Risk | Investments | Brazil | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	18.00%	18.00%
Geographic Concentration Risk | Investments | Mexico | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	6.00%
Geographic Concentration Risk | Investments | United Kingdom | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	6.00%	8.00%
Geographic Concentration Risk | Investments | United Kingdom | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	4.00%	5.00%
Geographic Concentration Risk | Investments | Other Countries (more than 3%) | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	4.00%	6.00%
Financial Services Sector | Investment Sector Concentration Risk | Investments | Europe | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	27.00%	27.00%
Commercial Real Estate Portfolio Segment | Commercial mortgage loans | Minimum
Investment [Line Items]
Outstanding balance of commercial mortgage loans	$ 0.1	$ 0.1
Commercial Real Estate Portfolio Segment | Commercial mortgage loans | Maximum
Investment [Line Items]
Outstanding balance of commercial mortgage loans	$ 12.4	$ 12.5

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Cost or Amortized Cost
Due in one year or less, cost or amortized cost	$ 330.5
Due after one year through five years, cost or amortized cost	2,553.4
Due after five years through ten years, cost or amortized cost	2,478.9
Due after ten years, cost or amortized cost	3,792.5
Total, cost or amortized cost	9,155.3
Fixed maturity securities, cost or amortized cost	11,107.7	$ 10,834
Fair Value
Due in one year or less, fair value	332.6
Due after one year through five years, fair value	2,638.1
Due after five years through ten years, fair value	2,673.6
Due after ten years, fair value	4,573.3
Total, fair value	10,217.6
Fixed maturity securities, fair value	12,228.8	$ 11,257.1
Commercial mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	222.8
Fair Value
Fair value	232.4
Residential mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	1,212.5
Fair Value
Fair value	1,262.4
Asset-backed
Cost or Amortized Cost
Cost or amortized cost	517.1
Fair Value
Fair value	$ 516.4

Investments - Net Realized Gain

Investments - Net Realized Gains (Losses), Including Other-Than-Temporary Impairments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments	$ 18,400,000	$ (11,400,000)	$ 47,500,000	$ (10,900,000)
Net realized losses related to other-than-temporary impairment:	(600,000)	0	(900,000)	0
Total net realized gains (losses)	17,800,000	(11,400,000)	46,600,000	(10,900,000)
Equity securities without readily determinable fair value, related gain (loss)	0	0	10,400,000	7,800,000
Fixed maturity securities
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments	8,000,000	(7,600,000)	7,700,000	(10,200,000)
Net realized losses related to other-than-temporary impairment:	(600,000)	0	(900,000)	0
Equity securities
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments	7,000,000	(5,900,000)	36,900,000	(3,700,000)
Other investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments	5,200,000	1,200,000	5,100,000	2,500,000
Consolidated investment entities
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments	$ (1,800,000)	$ 900,000	$ (2,200,000)	$ 500,000

Investments - Unrealized Gains

Investments - Unrealized Gains on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized on equity securities	$ 7	$ (5.9)	$ 36.9	$ (3.7)
Less: Net realized gains (losses) related to sales of equity securities	0.1	2.3	(0.9)	3.7
Total unrealized gains on equity securities held	$ 6.9	$ (8.2)	$ 37.8	$ (7.4)

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	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	$ 366.2	$ 3,524.3
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(4.2)	(79.4)
Fixed maturity securities, 12 Months or More, Fair Value	321	746.4
Fixed maturity securities, 12 Months or More, Unrealized Losses	(5.6)	(28.9)
Fixed maturity securities, Total, Fair Value	687.2	4,270.7
Fixed maturity securities, Unrealized Losses	(9.8)	(108.3)
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	0	11.2
Fixed maturity securities, Less than 12 Months, Unrealized Losses	0	(0.1)
Fixed maturity securities, 12 Months or More, Fair Value	46	89.5
Fixed maturity securities, 12 Months or More, Unrealized Losses	(0.1)	(1.1)
Fixed maturity securities, Total, Fair Value	46	100.7
Fixed maturity securities, Unrealized Losses	(0.1)	(1.2)
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value		31.5
Fixed maturity securities, Less than 12 Months, Unrealized Losses		(0.1)
Fixed maturity securities, 12 Months or More, Fair Value		3.1
Fixed maturity securities, 12 Months or More, Unrealized Losses		(0.2)
Fixed maturity securities, Total, Fair Value		34.6
Fixed maturity securities, Unrealized Losses		(0.3)
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	49.7	136.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(0.1)	(2.8)
Fixed maturity securities, 12 Months or More, Fair Value	0	9.2
Fixed maturity securities, 12 Months or More, Unrealized Losses	0	(0.2)
Fixed maturity securities, Total, Fair Value	49.7	145.6
Fixed maturity securities, Unrealized Losses	(0.1)	(3)
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	206.5	370.6
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(1.9)	(9.6)
Fixed maturity securities, 12 Months or More, Fair Value	23.5	0
Fixed maturity securities, 12 Months or More, Unrealized Losses	(0.3)	0
Fixed maturity securities, Total, Fair Value	230	370.6
Fixed maturity securities, Unrealized Losses	(2.2)	(9.6)
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	1.8	29.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(0.1)	(0.7)
Fixed maturity securities, 12 Months or More, Fair Value	18.3	12.4
Fixed maturity securities, 12 Months or More, Unrealized Losses	(0.7)	(0.9)
Fixed maturity securities, Total, Fair Value	20.1	41.8
Fixed maturity securities, Unrealized Losses	(0.8)	(1.6)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	11.5	378.2
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(0.1)	(3.7)
Fixed maturity securities, 12 Months or More, Fair Value	148.6	309.6
Fixed maturity securities, 12 Months or More, Unrealized Losses	(2)	(11.1)
Fixed maturity securities, Total, Fair Value	160.1	687.8
Fixed maturity securities, Unrealized Losses	(2.1)	(14.8)
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	64.2	1,860.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(1.6)	(49.5)
Fixed maturity securities, 12 Months or More, Fair Value	62.3	173.1
Fixed maturity securities, 12 Months or More, Unrealized Losses	(2.1)	(10.2)
Fixed maturity securities, Total, Fair Value	126.5	2,033.5
Fixed maturity securities, Unrealized Losses	(3.7)	(59.7)
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, Less than 12 Months, Fair Value	32.5	706.6
Fixed maturity securities, Less than 12 Months, Unrealized Losses	(0.4)	(12.9)
Fixed maturity securities, 12 Months or More, Fair Value	22.3	149.5
Fixed maturity securities, 12 Months or More, Unrealized Losses	(0.4)	(5.2)
Fixed maturity securities, Total, Fair Value	54.8	856.1
Fixed maturity securities, Unrealized Losses	$ (0.8)	$ (18.1)

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total assets	[1]	$ 2,086.7	$ 1,685.4
Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Special purpose entities capitalized amount		73
Real estate funds | Consolidated investment entities
Variable Interest Entity [Line Items]
Total assets		116.2	91.5
Unfunded commitments		$ 3.8
Senior Debt Tranches | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Percentage of investment of senior debt tranche of CLO		5.00%
Subordinated Debt | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Total assets		$ 90.1	55.2
Senior Debt | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Total assets		$ 21.2	$ 21
Minimum | Subordinated Debt Tranches | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Investment percentage in most subordinated debt tranche		43.80%
Minimum | Overall Ownership | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Percentage of investment of overall ownership		6.00%
Maximum | Subordinated Debt Tranches | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Investment percentage in most subordinated debt tranche		100.00%
Maximum | Overall Ownership | Collateralized Loan Obligations | Consolidated investment entities
Variable Interest Entity [Line Items]
Percentage of investment of overall ownership		8.80%
Real estate funds | Consolidated investment entities
Variable Interest Entity [Line Items]
Capitalized real estate fund		$ 15.4
[1]	The following table presents information on assets and liabilities related to consolidated investment entities as of June 30, 2019 and December 31, 2018. June 30, 2019 December 31, 2018 (in millions) Assets Cash and cash equivalents $ 84.8 $ 62.6 Investments, at fair value 1,977.1 1,576.2 Other receivables 24.8 46.6 Total assets $ 2,086.7 $ 1,685.4 Liabilities Collateralized loan obligation notes, at fair value 1,616.5 1,316.7 Other liabilities 145.3 138.4 Total liabilities $ 1,761.8 $ 1,455.1

Variable Interest Entities - Fa

Variable Interest Entities - Fair Value of Financial Assets and Liabilities (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total financial assets	$ 15,594.5	$ 14,307.8
Financial liabilities	1,923	1,680.5
Consolidated investment entities
Variable Interest Entity [Line Items]
Total financial assets	2,061.9	1,638.8
Financial liabilities	1,616.5	1,316.7
Consolidated investment entities | Collateralized loan obligation notes
Variable Interest Entity [Line Items]
Financial liabilities	1,616.5	1,316.7
Consolidated investment entities | Cash and cash equivalents
Variable Interest Entity [Line Items]
Investments	84.8	62.6
Consolidated investment entities | Corporate debt securities
Variable Interest Entity [Line Items]
Investments	1,838.9	1,464.2
Consolidated investment entities | Real estate funds
Variable Interest Entity [Line Items]
Investments	138.2	112
Level 1
Variable Interest Entity [Line Items]
Total financial assets	2,574.9	2,235.6
Financial liabilities	1,692	1,463
Level 1 | Consolidated investment entities
Variable Interest Entity [Line Items]
Total financial assets	84.8	62.6
Financial liabilities	0	0
Level 1 | Consolidated investment entities | Collateralized loan obligation notes
Variable Interest Entity [Line Items]
Financial liabilities	0	0
Level 1 | Consolidated investment entities | Cash and cash equivalents
Variable Interest Entity [Line Items]
Investments	84.8	62.6
Level 1 | Consolidated investment entities | Corporate debt securities
Variable Interest Entity [Line Items]
Investments	0	0
Level 1 | Consolidated investment entities | Real estate funds
Variable Interest Entity [Line Items]
Investments	0	0
Level 2
Variable Interest Entity [Line Items]
Total financial assets	12,900.5	11,960.8
Financial liabilities	177.9	176.3
Level 2 | Consolidated investment entities
Variable Interest Entity [Line Items]
Total financial assets	1,838.9	1,464.2
Financial liabilities	1,616.5	1,316.7
Level 2 | Consolidated investment entities | Collateralized loan obligation notes
Variable Interest Entity [Line Items]
Financial liabilities	1,616.5	1,316.7
Level 2 | Consolidated investment entities | Cash and cash equivalents
Variable Interest Entity [Line Items]
Investments	0	0
Level 2 | Consolidated investment entities | Corporate debt securities
Variable Interest Entity [Line Items]
Investments	1,838.9	1,464.2
Level 2 | Consolidated investment entities | Real estate funds
Variable Interest Entity [Line Items]
Investments	0	0
Level 3
Variable Interest Entity [Line Items]
Total financial assets	119.1	111.4
Financial liabilities	53.1	41.2
Level 3 | Consolidated investment entities
Variable Interest Entity [Line Items]
Total financial assets	138.2	112
Financial liabilities	0	0
Level 3 | Consolidated investment entities | Collateralized loan obligation notes
Variable Interest Entity [Line Items]
Financial liabilities	0	0
Level 3 | Consolidated investment entities | Cash and cash equivalents
Variable Interest Entity [Line Items]
Investments	0	0
Level 3 | Consolidated investment entities | Corporate debt securities
Variable Interest Entity [Line Items]
Investments	0	0
Level 3 | Consolidated investment entities | Real estate funds
Variable Interest Entity [Line Items]
Investments	$ 138.2	$ 112

Variable Interest Entities - Ca

Variable Interest Entities - Carrying value of level 3 assets (Details) - Real estate funds - Consolidated investment entities - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Real Estate Carrying Amount [Roll Forward]
Purchases			$ 15.4
Level 3
Real Estate Carrying Amount [Roll Forward]
Balance, beginning of period	$ 121.4	$ 86.8	112	$ 84.7
Purchases	15.4	23	15.4	23
Sales	0	(6.8)	0	(6.8)
Total income (loss) included in retained earnings	1.4	(0.5)	10.8	1.6
Balance, end of period	$ 138.2	$ 102.5	$ 138.2	$ 102.5

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	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	$ 15,594.5	$ 14,307.8
Other liabilities	123.9	104.8
Liabilities related to separate accounts	1,799.1	1,575.7
Total financial liabilities	1,923	1,680.5
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	2,574.9	2,235.6
Other liabilities	70.6	62.9
Liabilities related to separate accounts	1,621.4	1,400.1
Total financial liabilities	1,692	1,463
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	12,900.5	11,960.8
Other liabilities	0.2	0.7
Liabilities related to separate accounts	177.7	175.6
Total financial liabilities	177.9	176.3
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	119.1	111.4
Other liabilities	53.1	41.2
Liabilities related to separate accounts	0	0
Total financial liabilities	53.1	41.2
U.S. government and government agencies and authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	231	384.6
U.S. government and government agencies and authorities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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]
Financial assets	231	384.6
U.S. government and government agencies and authorities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	262.6	256.2
States, municipalities and political subdivisions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
States, municipalities and political subdivisions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	262.6	256.2
States, municipalities and political subdivisions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Foreign governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	981.1	912.1
Foreign governments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0.5	0.5
Foreign governments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	980.6	911.6
Foreign governments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	516.4	504.5
Asset-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Asset-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	514.8	504.5
Asset-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	1.6	0
Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	232.4	79.7
Commercial mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Commercial mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	192.8	40.8
Commercial mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	39.6	38.9
Residential mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	1,262.4	1,405.8
Residential mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Residential mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	1,258.6	1,405.8
Residential mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	3.8	0
U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	6,371	5,593
U.S. corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
U.S. corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	6,359.7	5,580.3
U.S. corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	11.3	12.7
Foreign corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	2,371.9	2,121.2
Foreign corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Foreign corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	2,320.8	2,071.7
Foreign corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	51.1	49.5
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	44.2	45
Mutual funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	44.2	45
Mutual funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Mutual funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	18.8	15.3
Common Stock | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	18.1	14.6
Common Stock | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0.7	0.7
Common Stock | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	329.2	318.5
Non-redeemable preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Non-redeemable preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	327	316.3
Non-redeemable preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	2.2	2.2
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	321.9	336
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	216.1	188.9
Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	105.8	147.1
Short-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	235	224.9
Other investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	70.6	62.9
Other investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	163.9	161.5
Other investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0.5	0.5
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	607.8	527.7
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	604	523.6
Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	3.8	4.1
Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Other receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	5	5
Other receivables | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Other receivables | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Other receivables | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	5	5
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	4.7	2.6
Other assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	0
Other assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0.7	0
Other assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	4	2.6
Assets held in separate accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	1,799.1	1,575.7
Assets held in separate accounts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	1,621.4	1,400.1
Assets held in separate accounts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	177.7	175.6
Assets held in separate accounts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	$ 15,594.5	$ 14,307.8
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	2,574.9	2,235.6
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	12,900.5	11,960.8
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	119.1	111.4
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	783.1	759.6
Other investments	139.2	124.9
Other assets	36.9	43
Total financial assets	959.2	927.5
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	564.4	570.6
Funds withheld under reinsurance	308	272
Debt	2,007.3	2,006
Total financial liabilities	2,879.7	2,848.6
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	811.6	735.1
Other investments	139.2	124.9
Other assets	36.9	43
Total financial assets	987.7	903
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	568.9	556.8
Funds withheld under reinsurance	308	272
Debt	2,169.3	2,058.7
Total financial liabilities	3,046.2	2,887.5
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	0	0
Other investments	31.3	33.9
Other assets	0	0
Total financial assets	31.3	33.9
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	308	272
Debt	0	0
Total financial liabilities	308	272
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	2,169.3	2,058.7
Total financial liabilities	2,169.3	2,058.7
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	811.6	735.1
Other investments	107.9	91
Other assets	36.9	43
Total financial assets	956.4	869.1
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	568.9	556.8
Funds withheld under reinsurance	0	0
Debt	0	0
Total financial liabilities	$ 568.9	$ 556.8

Fair Value Disclosures - Narrat

Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowance for doubtful accounts reinsurance recoverable	$ 0.3	$ 0.3
Largest Reinsurance Recoverable Balances
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reinsurance recoverables	$ 777.2	$ 775.9

Reserves - Roll Forward of Clai

Reserves - Roll Forward of Claims and Benefits Payable (Details) - USD ($) $ in Millions	Dec. 03, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	May 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Claims and benefits payable		$ 2,813.7	$ 3,782.2	$ 2,722.2	$ 3,503.1
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Claims and benefits payable, at beginning of period		2,813.7	3,782.2
Less: Reinsurance ceded and other		(2,053.7)	(3,193.3)
Net claims and benefits payable, at beginning of period		760	588.9
Acquired reserves as of Acquisition Date				0		$ 140.7
Incurred losses and loss adjustment expenses related to:
Current year		1,339.4	940.3
Prior years		(37.7)	(30.6)
Total incurred losses and loss adjustment expenses		1,301.7	909.7
Paid losses and loss adjustment expenses related to:
Current year		882.9	624.6
Prior years		409.2	336.4
Total paid losses and loss adjustment expenses		1,292.1	961
Liability for unpaid claims and claims adjustment expense, period increase (decrease)	$ 730
Net claims and benefits payable, at end of period		769.6	678.3
Reinsurance ceded and other		2,053.7	3,193.3	1,952.6	2,824.8
Plus: Reinsurance ceded and other		1,952.6	2,824.8
Claims and benefits payable, at end of period		$ 2,722.2	$ 3,503.1
Ceded To U.S. Government | Not Rated
Paid losses and loss adjustment expenses related to:
Reinsurance recoverables				$ 83.2	$ 89.6
TWG Holdings Limited
Liability for Claims and Claims Adjustment Expense [Line Items]
Claims and benefits payable						419.9
Paid losses and loss adjustment expenses related to:
Reinsurance ceded and other						$ 279.2

Reserves - Narrative (Details)

Reserves - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years	$ (37.7)	$ (30.6)
Hurricane Michael, Florence and Maria
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years		2.9
Global Lifestyle, Excluding TWG
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years	30.3	20.8
Global Housing
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years	3.9	3.6
Health | Global Preneed and Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years	$ 3.5	$ 6.2

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 27, 2018
Debt Instrument [Line Items]
Debt outstanding	$ 2,007,300,000	$ 2,006,000,000
Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 900,000,000
Senior Notes | Floating Rate Senior Notes due March 2021
Debt Instrument [Line Items]
Aggregate principal amount	300,000,000		$ 300,000,000
Debt outstanding	$ 298,400,000	298,100,000
Senior Notes | Floating Rate Senior Notes due March 2021 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate increase	1.25%
Interest rate	3.58%		1.25%
Senior Notes | 4.00% Senior Notes due March 2023
Debt Instrument [Line Items]
Interest rate	4.00%		4.00%
Aggregate principal amount	$ 350,000,000		$ 350,000,000
Debt outstanding	348,300,000	348,100,000
Senior Notes | 4.20% Senior Notes due September 2023
Debt Instrument [Line Items]
Interest rate			4.20%	4.20%
Aggregate principal amount	300,000,000		$ 300,000,000
Debt outstanding	297,100,000	296,800,000
Senior Notes | 4.90% Senior Notes due March 2028
Debt Instrument [Line Items]
Interest rate			4.90%	4.90%
Aggregate principal amount	300,000,000		$ 300,000,000
Debt outstanding	$ 297,700,000	297,600,000
Senior Notes | 6.75% Senior Notes due February 2034
Debt Instrument [Line Items]
Interest rate	6.75%		6.75%
Aggregate principal amount	$ 375,000,000
Debt outstanding	$ 371,000,000	370,900,000
Subordinated notes | 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048
Debt Instrument [Line Items]
Interest rate	7.00%			7.00%
Aggregate principal amount	$ 400,000,000			$ 400,000,000
Debt outstanding	$ 394,800,000	$ 394,500,000
Subordinated notes | 7.00% Fixed-to-Floating Rate Subordinated Notes due March 2048 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate increase	4.135%
Interest rate				4.135%

Debt (Narrative) (Details)

Debt (Narrative) (Details)		Mar. 27, 2018USD ($)	Mar. 31, 2018USD ($)series	Jun. 30, 2019USD ($)$ / shares	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)$ / shares	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)$ / shares	Mar. 15, 2018USD ($)	Dec. 31, 2016USD ($)	Mar. 31, 2013USD ($)	Feb. 29, 2004USD ($)
Debt Instrument [Line Items]
Debt outstanding				$ 2,007,300,000		$ 2,007,300,000		$ 2,006,000,000
Net proceeds from issuance of debt	[1]					$ 0	$ 1,286,100,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 1		$ 1		$ 1
Amortization of deferred hedge gains				$ 800,000	$ 900,000	$ 1,500,000	900,000
Senior Notes
Debt Instrument [Line Items]
Number of series issued | series			3
Aggregate principal amount			$ 900,000,000
Senior Notes | 4.00% Senior Notes due March 2023
Debt Instrument [Line Items]
Debt outstanding				348,300,000		348,300,000		$ 348,100,000
Aggregate principal amount			$ 350,000,000	$ 350,000,000		$ 350,000,000
Interest rate			4.00%	4.00%		4.00%
Discount rate			0.365%
Senior Notes | Senior Notes2013
Debt Instrument [Line Items]
Aggregate principal amount											$ 700,000,000
Senior Notes | 6.75% Senior Notes due February 2034
Debt Instrument [Line Items]
Debt outstanding				$ 371,000,000		$ 371,000,000		370,900,000
Aggregate principal amount				$ 375,000,000		$ 375,000,000
Interest rate			6.75%	6.75%		6.75%
Senior Notes | Senior Notes 2021
Debt Instrument [Line Items]
Debt outstanding				$ 298,400,000		$ 298,400,000		298,100,000
Aggregate principal amount			$ 300,000,000	300,000,000		300,000,000
Senior Notes | 4.20% Senior Notes due September 2023
Debt Instrument [Line Items]
Debt outstanding				297,100,000		297,100,000		296,800,000
Aggregate principal amount			$ 300,000,000	300,000,000		300,000,000
Interest rate		4.20%	4.20%
Discount rate			0.233%
Senior Notes | 4.90% Senior Notes due March 2028
Debt Instrument [Line Items]
Debt outstanding				297,700,000		297,700,000		297,600,000
Aggregate principal amount			$ 300,000,000	300,000,000		300,000,000
Interest rate		4.90%	4.90%
Discount rate			0.383%
Senior Notes | Senior Notes 2018
Debt Instrument [Line Items]
Aggregate principal amount			$ 350,000,000						$ 350,000,000
Interest rate			2.50%						2.50%
Senior Notes | Senior Notes 2004
Debt Instrument [Line Items]
Aggregate principal amount												$ 475,000,000
Debt instrument, repurchase amount										$ 100,000,000
Discount rate												0.61%
Subordinated notes
Debt Instrument [Line Items]
Redemption price, percentage			102.00%
Subordinated notes | Subordinated Notes 2048
Debt Instrument [Line Items]
Debt outstanding				394,800,000		394,800,000		$ 394,500,000
Aggregate principal amount		$ 400,000,000		$ 400,000,000		$ 400,000,000
Interest rate		7.00%		7.00%		7.00%
The Notes
Debt Instrument [Line Items]
Net proceeds from issuance of debt		$ 1,290,000,000
London Interbank Offered Rate (LIBOR) | Senior Notes | Senior Notes 2021
Debt Instrument [Line Items]
Interest rate			1.25%	3.58%		3.58%
London Interbank Offered Rate (LIBOR) | Subordinated notes | Subordinated Notes 2048
Debt Instrument [Line Items]
Interest rate		4.135%
Letter of Credit
Debt Instrument [Line Items]
Long-term line of credit				$ 9,000,000		$ 9,000,000
Revolving Credit Facility | Jp Morgan Chase Bank N And Bank Of America N | Credit Facility 2017
Debt Instrument [Line Items]
Senior revolving credit facility				575,000,000		575,000,000
Credit facility borrowing capacity				450,000,000		450,000,000
Sublimit for letters of credit issued				50,000,000		50,000,000
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity				$ 441,000,000		$ 441,000,000
Series D MCPS
Debt Instrument [Line Items]
Share interest rate						6.50%
Preferred stock, par value (in dollars per share) | $ / shares				$ 1		$ 1
Derivative
Debt Instrument [Line Items]
Derivative qualified for hedge accounting gain (loss)						$ 26,700,000
Debt interest expense							$ 8,600,000
Derivative | Senior Notes | Senior Notes 2021
Debt Instrument [Line Items]
Aggregate principal amount			$ 150,000,000
Interest rate			2.72%
Interest Rate Derivatives
Debt Instrument [Line Items]
Derivative qualified for hedge accounting gain (loss)						$ 23,000,000
[1]	Refer to Note 11 for additional information.

Debt - Rating Agencies interest

Debt - Rating Agencies interest rate (Details)	6 Months Ended
	Jun. 30, 2019
Maximum
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	2.00%
BB Plus
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.25%
BB
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.50%
BB-
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.75%
B Plus Or Below
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	1.00%
Ba1
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.25%
Ba2
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.50%
Ba3
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	0.75%
B1 or below
Financing Receivable, Recorded Investment [Line Items]
Interest rate increase	1.00%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 5,112
Change in accumulated other comprehensive (loss) income before reclassifications	$ 230.3	$ (194.6)
Amounts reclassified from accumulated other comprehensive (loss) income	(5)	5	(3.8)	$ 7.7
Total other comprehensive income (loss)	225.3	(189.6)	484.1	(338)
Cumulative effect of change in accounting principles					$ 7.5
Ending balance	5,730.2		5,730.2
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	103.4	51.7	(155.4)	234
Change in accumulated other comprehensive (loss) income before reclassifications			487.9	(345.7)
Amounts reclassified from accumulated other comprehensive (loss) income			(3.8)	7.7
Total other comprehensive income (loss)	225.3	(189.6)	484.1	(338)
Cumulative effect of change in accounting principles					(33.9)
Ending balance	328.7	(137.9)	328.7	(137.9)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(365.4)	(272.3)	(375.6)	(281.5)
Change in accumulated other comprehensive (loss) income before reclassifications	(1.2)	(83.1)	9	(73.9)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Total other comprehensive income (loss)	(1.2)	(83.1)	9	(73.9)
Cumulative effect of change in accounting principles					0
Ending balance	(366.6)	(355.4)	(366.6)	(355.4)
Net unrealized gains on securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	549.9	372.1	301	581.2
Change in accumulated other comprehensive (loss) income before reclassifications	233.1	(110.6)	480.4	(288.5)
Amounts reclassified from accumulated other comprehensive (loss) income	(4.6)	4.7	(3)	7.4
Total other comprehensive income (loss)	228.5	(105.9)	477.4	(281.1)
Cumulative effect of change in accounting principles					(33.9)
Ending balance	778.4	266.2	778.4	266.2
Net unrealized gains on derivative transactions
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	18.1	21.1	18.4	0
Change in accumulated other comprehensive (loss) income before reclassifications	(2.3)	0.5	(2)	21.6
Amounts reclassified from accumulated other comprehensive (loss) income	(0.6)	(0.7)	(1.2)	(0.7)
Total other comprehensive income (loss)	(2.9)	(0.2)	(3.2)	20.9
Cumulative effect of change in accounting principles					0
Ending balance	15.2	20.9	15.2	20.9
OTTI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	14.9	14.4	15.1	17.9
Change in accumulated other comprehensive (loss) income before reclassifications	0.7	(1.4)	0.5	(4.9)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Total other comprehensive income (loss)	0.7	(1.4)	0.5	(4.9)
Cumulative effect of change in accounting principles					0
Ending balance	15.6	13	15.6	13
Unamortized net (losses) on Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(114.1)	(83.6)	(114.3)	(83.6)
Change in accumulated other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	0.2	1	0.4	1
Total other comprehensive income (loss)	0.2	1	0.4	1
Cumulative effect of change in accounting principles					$ 0
Ending balance	$ (113.9)	$ (82.6)	$ (113.9)	$ (82.6)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments, excluding other-than-temporary impairment losses	$ 18.4	$ (11.4)	$ 47.5	$ (10.9)
Net of tax	142.6	67	311.2	173
Interest expense	(26.5)	(26)	(53)	(47.5)
Provision for income taxes	0.1	0.2	0.3	(5.4)
Total reclassifications for the period, net of tax	(5)	5	(3.8)	7.7
Net unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(4.6)	4.7	(3)	7.4
Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes			(0.2)	(0.2)
Total reclassifications for the period, net of tax	0.2	1	0.4	1
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(0.6)	(0.7)	(1.2)	(0.7)
Total reclassifications for the period, net of tax	(5)	5
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments, excluding other-than-temporary impairment losses	(5.9)	6	(3.8)	9.4
Provision for income taxes	1.3	(1.3)	0.8	(2)
Net of tax	(4.6)	4.7	(3)	7.4
Reclassification out of Accumulated Other Comprehensive Income | Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	(0.1)	(0.2)
Total reclassifications for the period, net of tax	0.2	1
Reclassification out of Accumulated Other Comprehensive Income | Settlement gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.3	1.2	0.6	1.2
Interest Expense | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(0.8)	(0.9)	(1.5)	(0.9)
Provision for income taxes | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ 0.2	$ 0.2	$ 0.3	$ 0.2

Stock Based Compensation - Long

Stock Based Compensation - Long-Term Equity Incentive Plans (Details)	May 07, 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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 7.4	$ 8.7	$ 14.4	$ 13.8
Income tax benefit	(1.4)	(1.5)	(2.7)	(2.3)
Compensation expense, net of tax	$ 6	$ 7.2	$ 11.7	$ 11.5
RSUs granted (in shares)	31,554	32,330	225,396	421,829
Weighted average grant date fair value per unit (in dollars per share)	$ 96.18	$ 89.56	$ 97.56	$ 90.64
Total fair value of vested RSUs	$ 5	$ 2.6	$ 26.8	$ 18.8
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]
Unrecognized compensation cost	$ 31.2		$ 31.2
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)			1 year 3 months 18 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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6.6	$ 3.1	$ 10.8	$ 7.3
Income tax benefit	(0.9)	(0.4)	(1.5)	(1.3)
Compensation expense, net of tax	$ 5.7	$ 2.7	$ 9.3	$ 6
PSUs granted (in shares)	0	0	246,219	0
Weighted average grant date fair value per unit (in dollars per share)	$ 0	$ 0	$ 105.23	$ 0
Total fair value of vested PSUs	$ 0	$ 25.6	$ 17.7	$ 25.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]
Unrecognized compensation cost	$ 38.2		$ 38.2
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)			1 year 3 months 18 days

Equity Transactions - Narrative

Equity Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Share repurchases (in shares)				1,037,262	0
Acquisition of common stock		$ 50.1		$ 100.7
Amount remaining under total repurchase authorization		$ 660.5		$ 660.5
Preferred stock, shares issued (in shares)		2,875,000		2,875,000		2,875,000
Preferred stock dividends		$ 4.6	$ 4.8	$ 9.3	$ 4.8
Series D MCPS
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	2,875,000
Public Offering price (in dollars per share)	$ 100
Net proceeds from sale of stock	$ 276.4
Share interest rate				6.50%
Liquidation price (in dollars per share)		$ 100		$ 100
Minimum | Series D MCPS
Class of Stock [Line Items]
Stock conversion ratio (in shares)	0.9365
Maximum | Series D MCPS
Class of Stock [Line Items]
Stock conversion ratio (in shares)	1.1239

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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income attributable to stockholders	$ 144.1	$ 67	$ 309.8	$ 173
Less: Preferred stock dividends	(4.6)	(4.8)	(9.3)	(4.8)
Net income attributable to common stockholders	139.5	62.2	300.5	168.2
Less: Common stock dividends paid	(38.3)	(30.9)	(75.7)	(60.6)
Undistributed earnings	$ 101.2	$ 31.3	$ 224.8	$ 107.6
Denominator
Weighted average common shares outstanding used in basic earnings per common share (in shares)	62,222,090	57,060,313	62,407,429	55,125,584
Incremental common shares from:
Weighted average common shares used in diluted earnings per common share calculations (in shares)	65,288,447	57,264,408	65,560,930	57,273,428
Earnings per common share - Basic
Distributed earnings (in dollars per share)	$ 0.62	$ 0.54	$ 1.21	$ 1.10
Undistributed earnings (in dollars per share)	1.62	0.55	3.61	1.95
Net income (in dollars per share)	2.24	1.09	4.82	3.05
Earnings per common share - Diluted
Distributed earnings (in dollars per share)	0.59	0.54	1.16	1.06
Undistributed earning (in dollars per share)	1.62	0.55	3.57	1.96
Net income (in dollars per share)	$ 2.21	$ 1.09	$ 4.73	$ 3.02
PSUs
Incremental common shares from:
Incremental common shares (in shares)	114,502	163,596	172,321	217,455
ESPP
Incremental common shares from:
Incremental common shares (in shares)	42,642	40,499	42,642	40,499
Series D MCPS
Incremental common shares from:
Mandatory convertible preferred stock (in shares)	2,909,213	0	2,938,538	1,889,890

Earnings Per Common Share - Nar

Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from computation of diluted EPS (in shares)	95,899	4,171	137,588	4,171
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from computation of diluted EPS (in shares)		3,056,700

Retirement and Other Employee_3

Retirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan | Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 6.6	$ 5.8	$ 13.1	$ 11.6
Expected return on plan assets	(9)	(9.1)	(18)	(18.2)
Amortization of net loss	0	0.2	0	0.4
Net periodic benefit cost	(2.4)	(3.1)	(4.9)	(6.2)
Pension Plan | Unfunded Nonqualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.7	0.7	1.4	1.4
Expected return on plan assets	0	0	0	0
Amortization of net loss	0.3	0.3	0.6	0.8
Net periodic benefit cost	1	1	2	2.2
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.9	0.9	1.8	1.7
Expected return on plan assets	(0.5)	(0.6)	(0.9)	(1.1)
Amortization of net loss	0	0	0	0
Net periodic benefit cost	$ 0.4	$ 0.3	$ 0.9	$ 0.6

Retirement and Other Employee_4

Retirement and Other Employee Benefits - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Defined Benefit Plan [Abstract]
Qualified pension benefits plan under-funded amount	$ 63,500,000	$ 65,100,000
Funded status percentage	109.00%	110.00%
Cash contribution to qualified pension benefits plan	$ 0
Cash expected contribution to plan over remainder of fiscal year	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 12.1	$ 13.2