Assurant (AIZ) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	ASSURANT INC
Entity Central Index Key	1,267,238
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Trading Symbol	AIZ
Entity Common Stock, Shares Outstanding		53,811,707

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017		Dec. 31, 2016
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost - $8,888.9 in 2017 and $8,870.8 in 2016)	$ 9,732.4		$ 9,572.1
Equity securities available for sale, at fair value (cost - $348.7 in 2017 and $381.8 in 2016)	403.3		421.4
Commercial mortgage loans on real estate, at amortized cost	648.1		624
Policy loans	36.9		38.5
Short-term investments	266.6		227.7
Other investments	589.3		595.3
Total investments	11,676.6		11,479
Cash and cash equivalents	992.8		1,032
Premiums and accounts receivable, net	1,286.4		1,218
Reinsurance recoverables	10,578.3		9,083.2
Accrued investment income	114.1		110.1
Deferred acquisition costs	3,482.6		3,267.4
Property and equipment, at cost less accumulated depreciation	358.4		343.6
Tax receivable	117.4		20.5
Goodwill	916		830.9
Value of business acquired	26.3		32.1
Other intangible assets, net	306.6		240.3
Other assets (includes assets of special purpose entities of $349.7 in 2017)	749.4		359.7
Assets held in separate accounts	1,800.3		1,692.3
Total assets	32,405.2		29,709.1
Liabilities
Future policy benefits and expenses	10,436.9		10,112.9
Unearned premiums	6,962.6		6,626.5
Claims and benefits payable	4,794.2	[1]	3,301.2
Commissions payable	377.5		386.2
Reinsurance balances payable	173.4		95.3
Funds held under reinsurance	142.7		111.7
Deferred gains on disposal of businesses	148.5		232.2
Accounts payable and other liabilities (includes liabilities of special purpose entities of $279.7 in 2017)	2,363		1,985.7
Debt	1,067.9		1,067
Liabilities related to separate accounts	1,800.3		1,692.3
Total liabilities	28,267		25,611
Commitments and contingencies (Note 15)
Stockholders’ equity
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 53,796,348 and 55,941,480 shares outstanding at September 30, 2017 and December 31, 2016, respectively	1.5		1.5
Additional paid-in capital	3,186.8		3,175.9
Retained earnings	5,414.6		5,296.7
Accumulated other comprehensive income	256.4		94.6
Treasury stock, at cost; 96,577,040 and 94,041,583 shares at September 30, 2017 and December 31, 2016, respectively	(4,721.1)		(4,470.6)
Total stockholders’ equity	4,138.2		4,098.1
Total liabilities and stockholders’ equity	$ 32,405.2		$ 29,709.1
[1]	Global Housing's reinsurance recoverables and claims and benefits payable as of September 30, 2017 include $1,123.0

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fixed maturity securities available for sale, amortized cost	$ 8,888.9	$ 8,870.8
Equity securities available for sale, cost	348.7	381.8
Other assets (includes assets of special purpose entities of $349.7 in 2017)	349.7	0
Accounts payable and other liabilities (includes liabilities of special purpose entities of $279.7 in 2017)	$ 279.7	$ 0
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 outstanding (in shares)	53,796,348	55,941,480
Treasury stock, at cost (in shares)	96,577,040	94,041,583

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Revenues
Net earned premiums		$ 1,073.1		$ 1,215.1	$ 3,238.7		$ 3,832.6
Fees and other income		349.1		347.7	1,016.2		1,033.7
Net investment income		132.6		124.8	374.9		380.3
Net realized gains on investments, excluding other-than-temporary impairment losses		8.9	[1]	10.7	26	[1]	194.7	[1]
Total other-than-temporary impairment losses		(0.4)		0	(0.9)		(0.4)
Portion of net gain recognized in other comprehensive income, before taxes		0		0	0		(0.3)
Net other-than-temporary impairment losses recognized in earnings		(0.4)		0	(0.9)		(0.7)
Amortization of deferred gains and gains on disposal of businesses	[2]	23.1		135.8	83.5		309.2
Gain on pension plan curtailment		0		0	0		29.6
Total revenues		1,586.4		1,834.1	4,738.4		5,779.4
Benefits, losses and expenses
Policyholder benefits	[3]	682.2		435.2	1,456.6		1,379.8
Amortization of deferred acquisition costs and value of business acquired		332.5		330.3	993.7		1,007.3
Underwriting, general and administrative expenses		667.1		833.7	1,964.7		2,554.6
Interest expense		12.2		14	37.2		43.7
Total benefits, losses and expenses		1,694		1,613.2	4,452.2		4,985.4
(Loss) income before (benefit) provision for income taxes		(107.6)		220.9	286.2		794
(Benefit) provision for income taxes		(50.3)		76.5	79.5		259.9
Net (loss) income		$ (57.3)		$ 144.4	$ 206.7		$ 534.1
Earnings Per Share
Basic (in dollars per share)		$ (1.05)		$ 2.40	$ 3.75		$ 8.54
Diluted (in dollars per share)	[4]	(1.05)		2.37	3.73		8.46
Dividends per share (in dollars per share)		$ 0.53		$ 0.50	$ 1.59		$ 1.50
Share Data
Weighted average shares outstanding used in basic per share calculations (in shares)		54,524,874		60,262,073	55,096,933		62,522,980
Plus: Dilutive securities (in shares)		0		566,268	312,318		570,340
Weighted average shares used in diluted earnings per share calculations (in shares)		54,524,874		60,828,341	55,409,251		63,093,320
[1]	Nine months ended September 30, 2016 net gains includes $146.7
[2]	The nine months ended September 30, 2017 and 2016 include $75.2 and $300.4
[3]	The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the nine months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $28.8 and $20.2
[4]	In accordance with earnings per share guidance, diluted per share amounts are computed in the same manner as basic per share amounts when a loss from operations exists.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (57.3)	$ 144.4	$ 206.7	$ 534.1
Other comprehensive (loss) income:
Change in unrealized gains on securities, net of taxes of $4.0, $(8.4), $(53.7) and $(85.7), respectively	(7.7)	16.3	98.6	162.1
Change in other-than-temporary impairment gains, net of taxes of $0.5, $(0.2), $1.5 and $0.4, respectively	(1)	0.3	(2.8)	(0.8)
Change in foreign currency translation, net of taxes of $(1.5), $0.5, $(2.8) and $(1.2), respectively	27.6	(15.9)	65.1	(18.6)
Amortization of pension and postretirement unrecognized net periodic benefit cost, net of taxes of $(0.3), $(0.1), $(0.5) and $(36.0), respectively	0.6	0.2	0.9	66.8
Total other comprehensive income	19.5	0.9	161.8	209.5
Total comprehensive (loss) income	$ (37.8)	$ 145.3	$ 368.5	$ 743.6

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains on securities, taxes	$ 4	$ (8.4)	$ (53.7)	$ (85.7)
Net change in other-than-temporary impairment gains, taxes	0.5	(0.2)	1.5	0.4
Net change in foreign currency translation, taxes	(1.5)	0.5	(2.8)	(1.2)
Net change in pension plan curtailment and amortization of pension and postretirement unrecognized net periodic benefit cost, taxes	$ (0.3)	$ (0.1)	$ (0.5)	$ (36)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning balance at Dec. 31, 2015					$ 118.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 534.1
Other comprehensive income	209.5
Ending balance at Sep. 30, 2016					328
Beginning balance at Jun. 30, 2016					327.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	144.4
Other comprehensive income	0.9
Ending balance at Sep. 30, 2016					328
Beginning balance at Dec. 31, 2016	4,098.1	$ 1.5	$ 3,175.9	$ 5,296.7	94.6	$ (4,470.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	(12.1)		(12.1)
Stock plan compensation	23		23
Dividends	(88.8)			(88.8)
Acquisition of common stock	(250.5)					(250.5)
Net income	206.7			206.7
Other comprehensive income	161.8				161.8
Ending balance at Sep. 30, 2017	4,138.2	1.5	3,186.8	5,414.6	256.4	(4,721.1)
Beginning balance at Jun. 30, 2017					236.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(57.3)
Other comprehensive income	19.5
Ending balance at Sep. 30, 2017	$ 4,138.2	$ 1.5	$ 3,186.8	$ 5,414.6	$ 256.4	$ (4,721.1)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Net cash provided by (used in) operating activities		$ 366.4	$ (68)
Sales of:
Fixed maturity securities available for sale		2,270.3	1,736.1
Equity securities available for sale		59.1	160
Other invested assets		72.6	51.9
Subsidiary, net of cash transferred	[1]	0	873.9
Commercial mortgage loans on real estate		0	268.8
Maturities, calls, prepayments, and scheduled redemption of:
Fixed maturity securities available for sale		631.5	589.4
Commercial mortgage loans on real estate		102.9	87
Purchases of:
Fixed maturity securities available for sale		(2,734.2)	(2,832.4)
Equity securities available for sale		(18.8)	(150.5)
Commercial mortgage loans on real estate		(124)	(52.2)
Other invested assets		(71.6)	(79.2)
Property and equipment and other		(43.4)	(66.8)
Subsidiaries, net of cash transferred	[2]	(127.4)	(63.2)
Special Purpose Entities
Purchases of investments	[3]	(265.3)	0
Proceeds from sales and redemptions of investments	[3]	36.2	0
Change in short-term investments		(31.7)	106
Other		1.8	2.5
Net cash (used in) provided by investing activities		(242)	631.3
Financing activities
Issuance of debt	[3]	0	249.6
Repayment of debt		0	(250)
Change in tax benefit from share-based payment arrangements		0	9.4
Proceeds from Issuance of Secured Debt	[3]	157.7	0
Acquisition of common stock		(256.8)	(674.3)
Dividends paid		(88.8)	(95)
Withholding on stock based compensation		18.2	25
Net cash used in financing activities		(169.7)	(735.3)
Effect of exchange rate changes on cash and cash equivalents		6.1	(5.5)
Adjustments for cash included in business classified as held for sale		0	5.9
Change in cash and cash equivalents		(39.2)	(171.6)
Cash and cash equivalents at beginning of period		1,032	1,288.3
Cash and cash equivalents at end of period		$ 992.8	$ 1,116.7
[1]	Primarily relates to the sale of Assurant's Employee Benefits segment mainly through reinsurance transactions.
[2]	2017 primarily includes the acquisition of Green Tree Insurance Agency, Inc
[3]	Refer to Note 7- Investments for additional information regarding 2017 activity.

Nature of Operations

Nature of Operations	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Assurant, Inc. (the “Company”) is a holding company whose subsidiaries globally provide risk management solutions in the housing and lifestyle markets, protecting where consumers live and the goods they buy. The Company is traded on the New York Stock Exchange under the symbol "AIZ."

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and for the three and nine months ended September 30, 2017 and 2016 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. Certain prior period amounts have been reclassified to conform to the 2017 presentation.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Amortization period of premiums associated with callable debt : On April 1, 2017, the Company early adopted the amended guidance to shorten the amortization period of premiums on certain purchased callable debt securities to the earliest call date. Such guidance would have been required to be adopted in 2019. Since the Company’s current policy is to amortize premiums on callable debt securities to the earliest call date, at the date of adoption there was no impact to the Company’s financial position or results of operations. Goodwill impairment testing : On January 1, 2017, the Company adopted the amended guidance on goodwill impairment testing. Under the amended guidance, the optional qualitative assessment (Step 0) and the first step of the quantitative assessment (Step 1) remain unchanged. Step 2 is eliminated. As a result, for annual impairment testing or in the event a test is required prior to the annual test, the Company will use Step 1 to determine both the existence and amount of goodwill impairment. An impairment loss will be recognized for the amount by which the reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill in that reporting unit. The Company is adopting this guidance on a prospective basis as a change in accounting principle, therefore at the date of adoption there is no impact to the Company’s financial position or results of operations. Employee share-based stock compensation : On January 1, 2017, the Company adopted the amended guidance on accounting for employee share-based stock compensation. The updated guidance simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows, and accounting for forfeitures. Upon adoption the Company recognizes excess tax benefits or deficiencies in net income, as well as the related cash flows in operating activities, on a prospective basis. The earnings impact of the adoption did not have a material impact on the Company’s financial results of operations. The updated guidance allows companies a policy election with regard to forfeitures and the Company has elected to continue its existing practice of estimating the number of awards that will be forfeited. As required in the updated guidance, the Company will present cash flows related to employee withholding taxes as financing activities as opposed to operating activities, on a retrospective basis, which resulted in the reclassification of $18.2 and $25.0 in the consolidated statements of cash flows for the periods ending September 30, 2017 and 2016, respectively. Not Yet Adopted Income tax consequences for intra-entity transfers of assets : In October 2016, the FASB issued amended guidance on tax accounting for intra-entity transfers of assets. Current guidance prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The amendments require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Also, the amended guidance eliminates the exception for an intra-entity transfer of an asset other than inventory. The amended guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. Early adoption is permitted. The adoption of this amended guidance will not have an impact on the Company’s financial position and results of operations. Statement of cash flows presentation and classification : In August 2016, the FASB issued amended guidance on presentation and classification in the statement of cash flows. The amendments address certain specific cash flow issues: debt prepayment and debt extinguishment costs; settlement of zero-coupon or insignificant coupon debt instruments; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and guidance related to the identification of the primary source for separately identifiable cash flows. The amended guidance is effective in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. The adoption of this amended guidance will not have an impact on the Company’s financial position and results of operations. Reporting credit losses of assets held at amortized cost : In June 2016, the 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 amended guidance is effective in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2020. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the requirements of this amended guidance and the potential impact on the Company’s financial position and results of operations. Lease accounting : In February 2016, the FASB issued new guidance on leases, which replaces the current lease guidance. The new guidance requires that entities recognize the assets and liabilities associated with leases on the balance sheet and disclose key information about leasing arrangements. The new guidance is effective in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2019. Early adoption is permitted. The Company is evaluating the requirements of this new lease guidance and the potential impact on the Company’s financial position and results of operations. Financial instruments measurement and classification : In January 2016, the FASB issued amended guidance on the measurement and classification of financial instruments. This amended guidance requires that all equity investments be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option has been elected for financial liabilities. The amendments eliminate the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, however public business entities will be required to use the exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. In addition, the new guidance requires financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. The amended guidance is effective in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. Upon adoption, all common and preferred stocks will be measured at fair value through the income statement. For certain private equity investments recorded in Other investments, the Company will elect the measurement alternative to record these investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer. The measurement alternative will be applied on a prospective basis. The potential impact of this amended measurement and classification of financial instruments guidance on the Company’s financial position and results of operations will be determined based on the market values of the common and preferred stocks on the date of adoption. Revenue recognition from contracts with customers : In May 2014, the FASB issued amended guidance on revenue recognition from contracts with customers, which is required to be implemented in 2018 for public companies. Further amendments and technical corrections were made to the amended guidance during 2016 and 2017. The amended guidance, which the Company will adopt effective January 1, 2018, affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. Insurance and similar contracts issued by insurance entities are within the scope of other standards and therefore are specifically excluded from the scope of the amended revenue recognition guidance. The amended guidance creates a five step approach that emphasizes the recognition of revenue when the performance obligations are met in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity expects to receive. This guidance may be adopted using the full retrospective method, whereby the amended guidance is applied to each prior period presented, and the cumulative effect of applying the amended guidance is recognized at the beginning of the earliest period presented or the modified retrospective approach, whereby the cumulative effect of applying the amended guidance is recognized at the beginning of the year of adoption and the comparative information is not restated and continues to be reported under the accounting standards in effect for those periods. The Company is nearing completion of its process to implement the guidance, which has included assessment of industry and technical developments and interpretations. The Company has assessed its revenue streams to identify those contracts that may be subject to the new standard. The Company had previously identified that up to 40% of its 2016 reported revenues required assessment under the new standard, including its fee based revenue contracts as well as its extended service warranty contracts. Based on the Company’s ongoing evaluation of its products and issuing entities, the adjusted in-scope revenues are now estimated to be just under 20%

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information As of September 30, 2017, the Company had four reportable segments, which are defined based on the manner in which our Chief Operating Decision Makers (CEO and COO) review 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, manufactured housing and flood insurance; renters insurance and related products (referred to as multi-family housing); and valuation and field services (referred to as mortgage solutions). • Global Lifestyle: provides mobile device protection and related services and extended service products and related services (referred to as Connected Living); vehicle protection services and credit insurance. • Global Preneed: provides pre-funded funeral insurance. • Total Corporate & Other: Corporate & 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 & Other also includes the amortization of deferred gains and gains associated with the sales of Fortis Financial Group, Long-Term Care and Assurant Employee Benefits ("AEB") through reinsurance agreements, expenses related to the pending acquisition of The Warranty Group (see Note 17), and other unusual or infrequent items. Additionally, the Total Corporate & Other segment includes amounts related to the runoff of the Assurant Health business. As Assurant Health was a reportable segment in prior years, these amounts are disclosed separately in the following segment tables for comparability. In addition, AEB was a separate reportable segment in 2016 and primarily includes the results of operations for the periods prior to its sale on March 1, 2016. See Note 5 for more information. The following tables summarize selected financial information by segment: Three Months Ended September 30, 2017 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 423.0 $ 636.0 $ 14.0 $ — $ 0.1 $ 0.1 $ 1,073.1 Fees and other income 107.3 205.7 30.6 4.5 1.0 5.5 349.1 Net investment income 23.6 33.1 66.4 8.6 0.9 9.5 132.6 Net realized gains on investments — — — 8.5 — 8.5 8.5 Amortization of deferred gains and gains on disposal of businesses (1) — — — 23.1 — 23.1 23.1 Total revenues 553.9 874.8 111.0 44.7 2.0 46.7 1,586.4 Benefits, losses and expenses Policyholder benefits (2) 436.7 190.6 62.6 — (7.7 ) (7.7 ) 682.2 Amortization of deferred acquisition costs and value of business acquired 49.7 266.1 16.7 — — — 332.5 Underwriting, general and administrative expenses (3) 235.0 371.9 13.3 38.2 8.7 46.9 667.1 Interest expense — — — 12.2 — 12.2 12.2 Total benefits, losses and expenses 721.4 828.6 92.6 50.4 1.0 51.4 1,694.0 Segment (loss) income before (167.5 ) 46.2 18.4 (5.7 ) 1.0 (4.7 ) (107.6 ) (Benefit) provision for income (57.2 ) 3.6 6.1 (3.7 ) 0.9 (2.8 ) (50.3 ) Segment (loss) income after tax $ (110.3 ) $ 42.6 $ 12.3 $ (2.0 ) $ 0.1 $ (1.9 ) Net loss $ (57.3 ) Three Months Ended September 30, 2016 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 457.4 $ 742.0 $ 15.2 $ — $ 0.5 $ 0.5 $ 1,215.1 Fees and other income 121.6 185.8 28.0 7.3 5.0 12.3 347.7 Net investment income 17.0 27.4 68.0 10.8 1.6 12.4 124.8 Net realized gains on investments — — — 10.7 — 10.7 10.7 Amortization of deferred gains and gains on disposal of businesses (1) — — — 135.8 — 135.8 135.8 Total revenues 596.0 955.2 111.2 164.6 7.1 171.7 1,834.1 Benefits, losses and expenses Policyholder benefits (2) 218.6 180.1 60.9 — (24.4 ) (24.4 ) 435.2 Amortization of deferred acquisition costs and value of business acquired 52.1 263.0 15.2 — — — 330.3 Underwriting, general and administrative expenses (3) 260.7 470.0 14.3 57.2 31.5 88.7 833.7 Interest expense — — — 14.0 — 14.0 14.0 Total benefits, losses and expenses 531.4 913.1 90.4 71.2 7.1 78.3 1,613.2 Segment income before provision for income tax 64.6 42.1 20.8 93.4 — 93.4 220.9 Provision for income taxes 20.1 13.8 6.4 34.5 1.7 36.2 76.5 Segment income (loss) after tax $ 44.5 $ 28.3 $ 14.4 $ 58.9 $ (1.7 ) $ 57.2 Net income $ 144.4 (1) The three months ended September 30, 2017 and 2016 include $20.4 and $132.9 , respectively, related to the amortization of deferred gains and gains related to the AEB sale on March 1, 2016. (2) The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the three months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $6.9 and $21.6 , respectively, through an offset to policyholder benefits expense. In addition, there was favorable claims development experienced through September 30, 2017, in excess of actual benefit expense, which contributed to the credit balance within policyholder benefits expenses. (3) The three months ended September 30, 2017 and 2016 for Corporate & Other includes expense of $4.5 and $18.0 , respectively, related to a post-close adjustment pertaining to an estimated indemnification that is expected to be due on a previous disposition. Nine Months Ended September 30, 2017 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 1,301.8 $ 1,887.8 $ 43.8 $ — $ 5.3 $ 5.3 $ 3,238.7 Fees and other income 310.4 594.8 91.3 16.3 3.4 19.7 1,016.2 Net investment income 59.6 86.0 195.6 28.0 5.7 33.7 374.9 Net realized gains on investments — — — 25.1 — 25.1 25.1 Amortization of deferred gains and gains on disposal of businesses (1) — — — 83.5 — 83.5 83.5 Total revenues 1,671.8 2,568.6 330.7 152.9 14.4 167.3 4,738.4 Benefits, losses and expenses Policyholder benefits (2) 788.2 517.3 190.7 — (39.6 ) (39.6 ) 1,456.6 Amortization of deferred acquisition costs and value of business acquired 147.4 800.7 45.6 — — — 993.7 Underwriting, general and administrative expenses (3) 723.2 1,067.2 42.5 95.7 36.1 131.8 1,964.7 Interest expense — — — 37.2 — 37.2 37.2 Total benefits, losses and expenses 1,658.8 2,385.2 278.8 132.9 (3.5 ) 129.4 4,452.2 Segment income before provision for income tax 13.0 183.4 51.9 20.0 17.9 37.9 286.2 Provision for income taxes 5.2 48.2 16.9 2.8 6.4 9.2 79.5 Segment income after tax $ 7.8 $ 135.2 $ 35.0 $ 17.2 $ 11.5 $ 28.7 Net income $ 206.7 As of September 30, 2017 Segment assets: $ 5,609.1 $ 9,447.8 $ 6,897.9 $ 10,325.9 $ 124.5 $ 10,450.4 $ 32,405.2 Nine Months Ended September 30, 2016 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Employee Benefits Consolidated Revenues Net earned premiums $ 1,378.3 $ 2,204.4 $ 47.0 $ — $ 24.9 $ 24.9 $ 178.0 $ 3,832.6 Fees and other income 339.2 572.6 82.2 17.1 18.4 35.5 4.2 1,033.7 Net investment income 53.2 80.6 192.0 29.7 7.5 37.2 17.3 380.3 Net realized gains on investments (4) — — — 194.0 — 194.0 — 194.0 Amortization of deferred gains and gains on disposal of businesses (1) — — — 309.2 — 309.2 — 309.2 Gain on pension plan curtailment — — — 29.6 — 29.6 — 29.6 Total revenues 1,770.7 2,857.6 321.2 579.6 50.8 630.4 199.5 5,779.4 Benefits, losses and expenses Policyholder benefits (2) 600.8 503.2 186.8 — (29.4 ) (29.4 ) 118.4 1,379.8 Amortization of deferred acquisition costs and value of business acquired 171.2 783.5 46.8 — — — 5.8 1,007.3 Underwriting, general and 734.0 1,420.3 41.1 178.5 122.2 300.7 58.5 2,554.6 Interest expense — — — 43.7 — 43.7 — 43.7 Total benefits, losses and expenses 1,506.0 2,707.0 274.7 222.2 92.8 315.0 182.7 4,985.4 Segment income (loss) before provision (benefit) for income tax 264.7 150.6 46.5 357.4 (42.0 ) 315.4 16.8 794.0 Provision (benefit) for income taxes 86.9 30.8 15.1 128.5 (7.7 ) 120.8 6.3 259.9 Segment income (loss) after tax $ 177.8 $ 119.8 $ 31.4 $ 228.9 $ (34.3 ) $ 194.6 $ 10.5 Net income $ 534.1 (1) The nine months ended September 30, 2017 and 2016 include $75.2 and $300.4 , respectively, related to the amortization of deferred gains and gains related to the AEB sale on March 1, 2016. (2) The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the nine months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $28.8 and $20.2 , respectively, through an offset to policyholder benefit expense. In addition, there was favorable claims development experienced through September 30, 2017, in excess of actual benefit expense, which contributed to the credit balance within policyholder benefits expenses. (3) The nine months ended September 30, 2016 for Corporate and Other includes a $16.7 intangible asset impairment charge related to trade names that will no longer be used or defended by the Company, and the nine months ended September 30, 2017 and 2016, for Corporate and Other includes expense of $6.0 and $18.0 , respectively, related to post-close adjustment pertaining to an estimated indemnification that is expected to be due on a previous disposition. (4) Nine months ended September 30, 2016 includes $146.7

Dispositions

Dispositions	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	Dispositions On March 1, 2016, the Company completed the sale of its AEB segment through a series of transactions with Sun Life Assurance Company of Canada, a subsidiary of Sun Life Financial Inc. ("Sun Life"), for net cash consideration of $942.2 (including contingent consideration), which resulted in an estimated gain of $656.5 . The transaction was primarily structured as a reinsurance arrangement, as well as the sale of certain legal entities that included ceding commission and other consideration. The reinsurance transaction does not extinguish the Company's primary liability on the policies issued or assumed by subsidiaries that are parties to the reinsurance agreements, thus any gains associated with the prospective component of the reinsurance transaction are deferred and amortized over the contract period, including contractual renewal periods, in proportion to the amount of insurance coverage provided. The Company also has an obligation to continue to write and renew certain policies for a period of time until Sun Life commences policy writing and renewal. The transition agreements between the Company and Sun Life are subject to amendment based on agreement between the parties. The Company was required to allocate the proceeds considering the relative fair value of the transaction components. Most of the expected gains resulting from the transaction related to our compensation for the inforce policies (prospective component), sales of net assets underlying the continuing business, as well as the future compensation for our performance obligations to write and renew certain policies for a period of time. The reinsurance for existing claims liabilities (retroactive component) resulted in a loss when considering the amounts paid for reinsurance premiums (assets we transferred to Sun Life) exceeded the recorded liabilities related to the underlying reinsurance contracts. The Company also recognized realized gains associated with the fair value of assets transferred to Sun Life (which offset losses on the retroactive component). Based on the allocation of the consideration and the resultant gains and losses, most of the gains are expected to be recognized over the next several years. The terms “deferred gain” and "amortization of deferred gain" broadly reflect the multiple transaction elements and earnings thereof, inclusive of the expected and actual income resulting from the reinsurance subject to prospective accounting, income expected to be earned related to the deferred gains associated with long-duration contracts, and the expected recognition of deferred revenues associated with our performance obligations. The total deferred gain amount (representing $520.4 of the total $656.5 of original estimated gains) has been and will continue to be recognized as revenue over the contract period in proportion to the amount of insurance coverage provided, including estimated contractual renewals pursuant to rate guarantees. The ultimate amortization pattern will be dependent on a number of factors including the timing of when Sun Life commences directly writing and renewing policies and the sales and persistency on business the Company is obligated to write and renew in the interim. The following represents a summary of the pre-tax gain recognized during the three and nine months ended September 30, 2017 and 2016 by transaction component, as well as the related classification within the financial statements: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Gain on sale of entities, net of transaction costs $ — $ — $ — $ 41.1 Novations, resulting in recognized gains (a) — — — 60.9 Loss on retroactive reinsurance component, before realized gains (b) — — — (128.7 ) Net loss prior to realized gains on transferred securities supporting retroactive component (c) — — — (26.7 ) Realized gains on transferred securities supporting retroactive component (b) — — — 146.7 Amortization of deferred gains (d) 20.4 132.9 75.2 300.4 Total $ 20.4 $ 132.9 $ 75.2 $ 420.4 (a) Novations of certain insurance policies directly to Sun Life allowed for immediate gain recognition. (b) Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the consolidated statements of operations. (c) Amount classified within underwriting, general and administrative expenses in the consolidated statements of operations. (d) Amount classified as amortization of deferred gains and gains on disposal of businesses within the consolidated statements of operations. The nine months ended September 30, 2017 amount includes subsequent novations of $1.4 that allowed immediate gain recognition. The remaining unamortized deferred gain as of September 30, 2017 was $80.9

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions On February 1, 2017, the Company acquired 100% of Green Tree Insurance Holdings, Corp. and its subsidiaries Green Tree Insurance Agency and Green Tree Insurance Agency Reinsurance Limited (collectively “Green Tree”) for $125.0 in cash with a potential earn-out of up to $25.0 , based on future performance. Green Tree sells housing protection products, including voluntary homeowners’ and manufactured housing policies, and other insurance products. In connection with the acquisition, the Company recorded $10.4 of net liabilities, $77.5 of agency relationship and renewal rights intangible assets, all of which are amortizable over periods ranging from 7 to 16 years, and $57.9 of goodwill, none of which is tax-deductible. The primary factors contributing to the recognition of goodwill is future expected growth of this business and operating synergies within Global Housing. Subsequent to the initial purchase accounting, the Company decreased intangible assets by $7.9 , with an offset to increase goodwill by $7.9

Investments

Investments	9 Months Ended
	Sep. 30, 2017
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 accumulated other comprehensive income of the Company's fixed maturity and equity securities as of the dates indicated: September 30, 2017 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (a) Fixed maturity securities: U.S. government and government agencies and authorities $ 176.1 $ 3.5 $ (0.6 ) $ 179.0 $ — States, municipalities and political subdivisions 357.2 27.6 (0.1 ) 384.7 — Foreign governments 525.8 58.4 (0.8 ) 583.4 — Asset-backed 136.3 1.3 (0.2 ) 137.4 1.0 Commercial mortgage-backed 40.1 0.2 (0.8 ) 39.5 — Residential mortgage-backed 1,114.4 38.9 (6.0 ) 1,147.3 11.1 U.S. corporate 4,856.1 569.6 (5.3 ) 5,420.4 15.3 Foreign corporate 1,682.9 165.9 (8.1 ) 1,840.7 — Total fixed maturity securities $ 8,888.9 $ 865.4 $ (21.9 ) $ 9,732.4 $ 27.4 Equity securities: Common stocks $ 7.0 $ 7.7 $ — $ 14.7 $ — Non-redeemable preferred stocks 341.7 47.2 (0.3 ) 388.6 — Total equity securities $ 348.7 $ 54.9 $ (0.3 ) $ 403.3 $ — December 31, 2016 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (a) Fixed maturity securities: U.S. government and government agencies and authorities $ 172.8 $ 3.4 $ (1.3 ) $ 174.9 $ — States, municipalities and political subdivisions 446.9 29.6 (0.4 ) 476.1 — Foreign governments 508.9 60.5 (0.9 ) 568.5 — Asset-backed 2.6 1.2 (0.1 ) 3.7 1.1 Commercial mortgage-backed 39.3 0.1 (1.0 ) 38.4 — Residential mortgage-backed 1,071.2 38.1 (8.0 ) 1,101.3 12.8 U.S. corporate 5,022.7 454.1 (15.6 ) 5,461.2 15.6 Foreign corporate 1,606.4 147.2 (5.6 ) 1,748.0 2.2 Total fixed maturity securities $ 8,870.8 $ 734.2 $ (32.9 ) $ 9,572.1 $ 31.7 Equity securities: Common stocks $ 11.9 $ 8.9 $ — $ 20.8 $ — Non-redeemable preferred stocks 369.9 31.8 (1.1 ) 400.6 — Total equity securities $ 381.8 $ 40.7 $ (1.1 ) $ 421.4 $ — (a) Represents the amount of OTTI recognized in accumulated other comprehensive income (“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 states, municipalities and political subdivisions holdings are highly diversified across the U.S., with no individual state’s exposure (including both general obligation and revenue securities) exceeding 0.5% of the overall investment portfolio as of September 30, 2017 and December 31, 2016. As of September 30, 2017 and December 31, 2016, the securities include general obligation and revenue bonds issued by states, cities, counties, school districts and similar issuers, including $186.7 and $215.3 , 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 September 30, 2017 and December 31, 2016, revenue bonds account for 49% and 46% of the holdings, respectively. Excluding pre-refunded revenue bonds, the activities supporting the income streams of the Company’s revenue bonds are across a broad range of sectors, primarily highway, water, airport and marina, specifically pledged tax revenues, 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, which allow the assets and liabilities to be more appropriately matched. As of September 30, 2017, approximately 78% , 13% and 4% of the foreign government securities were held in the Canadian government/provincials and the governments of Brazil and Germany, respectively. As of December 31, 2016, approximately 78% , 11% and 4% of the foreign government securities were held in the Canadian government/provincials and the governments of Brazil and Germany, respectively. No other country represented more than 3% of the Company's foreign government securities as of September 30, 2017 and December 31, 2016. The Company has European investment exposure in its corporate fixed maturity and equity securities of $627.5 with a net unrealized gain of $64.2 as of September 30, 2017 and $693.3 with a net unrealized gain of $54.2 as of December 31, 2016. Approximately 28% and 23% of the corporate European exposure is held in the financial industry as of September 30, 2017 and December 31, 2016, respectively. The Company's largest European country exposure (the United Kingdom) represented approximately 4% of the fair value of the Company's corporate securities as of September 30, 2017 and December 31, 2016. Approximately 8% of the fair value of the corporate European securities are pound and euro-denominated and are not hedged to U.S. dollars, but held to support related foreign-denominated liabilities of the Company's international businesses. The Company's international investments are managed as part of the overall portfolio with the same approach to risk management and focus on diversification. The Company has exposure to the energy sector in its corporate fixed maturity securities of $676.3 with a net unrealized gain of $64.1 as of September 30, 2017 and $641.9 with a net unrealized gain of $51.6 as of December 31, 2016. Approximately 87% and 84% of the energy exposure is rated as investment grade as of September 30, 2017 and December 31, 2016, respectively. The cost or amortized cost and fair value of fixed maturity securities as of September 30, 2017 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 $ 243.8 $ 246.4 Due after one year through five years 1,709.4 1,768.0 Due after five years through ten years 1,847.2 1,933.4 Due after ten years 3,797.7 4,460.4 Total 7,598.1 8,408.2 Asset-backed 136.3 137.4 Commercial mortgage-backed 40.1 39.5 Residential mortgage-backed 1,114.4 1,147.3 Total $ 8,888.9 $ 9,732.4 The following table sets forth the net realized gains (losses), including OTTI, recognized in the statement of operations as follows: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 2.3 $ 8.7 $ 16.8 $ 154.5 Equity securities 3.0 (0.2 ) 6.8 12.9 Commercial mortgage loans on real estate — 0.1 — 21.6 Other investments 3.6 2.1 2.4 5.7 Total net realized gains related to sales and other (a) 8.9 10.7 26.0 194.7 Net realized losses related to other-than-temporary impairments: Fixed maturity securities — — (0.4 ) (0.7 ) Other investments (0.4 ) — (0.5 ) — Total net realized losses related to other-than- temporary impairments (0.4 ) — (0.9 ) (0.7 ) Total net realized gains $ 8.5 $ 10.7 $ 25.1 $ 194.0 (a) Nine months ended September 30, 2016 net gains includes $146.7 related to the sale of AEB as described in Note 5. The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities and equity securities as of September 30, 2017 and December 31, 2016 were as follows: September 30, 2017 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 $ 99.6 $ (0.5 ) $ 4.7 $ (0.1 ) $ 104.3 $ (0.6 ) States, municipalities and political subdivisions — — 2.4 (0.1 ) 2.4 (0.1 ) Foreign governments 49.0 (0.8 ) — — 49.0 (0.8 ) Asset-backed 26.3 (0.2 ) — — 26.3 (0.2 ) Commercial mortgage-backed 17.5 (0.7 ) 12.3 (0.1 ) 29.8 (0.8 ) Residential mortgage-backed 282.7 (5.0 ) 31.6 (1.0 ) 314.3 (6.0 ) U.S. corporate 445.7 (4.7 ) 26.9 (0.6 ) 472.6 (5.3 ) Foreign corporate 387.8 (7.8 ) 7.7 (0.3 ) 395.5 (8.1 ) Total fixed maturity securities $ 1,308.6 $ (19.7 ) $ 85.6 $ (2.2 ) $ 1,394.2 $ (21.9 ) Equity securities: Non-redeemable preferred stocks $ 5.4 $ (0.3 ) $ — $ — $ 5.4 $ (0.3 ) December 31, 2016 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 $ 91.0 $ (1.3 ) $ — $ — $ 91.0 $ (1.3 ) States, municipalities and political subdivisions 16.9 (0.4 ) — — 16.9 (0.4 ) Foreign governments 98.8 (0.9 ) — — 98.8 (0.9 ) Asset-backed — — 1.0 (0.1 ) 1.0 (0.1 ) Commercial mortgage-backed 33.2 (1.0 ) — — 33.2 (1.0 ) Residential mortgage-backed 347.5 (7.9 ) 2.2 (0.1 ) 349.7 (8.0 ) U.S. corporate 940.4 (13.1 ) 34.1 (2.5 ) 974.5 (15.6 ) Foreign corporate 227.3 (4.6 ) 7.6 (1.0 ) 234.9 (5.6 ) Total fixed maturity securities $ 1,755.1 $ (29.2 ) $ 44.9 $ (3.7 ) $ 1,800.0 $ (32.9 ) Equity securities: Non-redeemable preferred stocks $ 64.4 $ (1.0 ) $ 1.9 $ (0.1 ) $ 66.3 $ (1.1 ) Total gross unrealized losses represent less than 2% of the aggregate fair value of the related securities with such unrealized gains as of September 30, 2017 and December 31, 2016. Approximately 90% and 89% of these gross unrealized losses have been in a continuous loss position for less than twelve months as of September 30, 2017 and December 31, 2016, respectively. The total gross unrealized losses are comprised of 593 and 796 individual securities as of September 30, 2017 and December 31, 2016, 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 September 30, 2017 and December 31, 2016. 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 September 30, 2017, approximately 37% of the outstanding principal balance of commercial mortgage loans was concentrated in the states of California, Oregon, and Utah. 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 less than $0.1 to $12.8 as of September 30, 2017 and from less than $0.1 to $12.6 as of December 31, 2016. Variable Interest Entities ("VIE") A VIE is a legal entity which does not have sufficient equity at risk to allow the entity to finance its activities without additional financial support or in which the equity investors, as a group, do not have the characteristic of a controlling financial interest. A company is considered the primary beneficiary of, and therefore must consolidate, a VIE if it has the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Collateralized Loan Obligations: In January 2017, one of our subsidiaries registered with the U.S. Securities and Exchange Commission (the "SEC") as an investment adviser and such subsidiary (or one of its affiliates) intends to manage and invest in collateralized loan obligations (“CLOs”), and conduct other forms of investment activities. In connection with the planned formation of CLO structures, the Company formed two special purpose entities ("SPEs"), which were capitalized with $70.0 to begin purchasing senior secured leveraged loans. The entities have been funded with equity from the Company’s wholly owned subsidiaries. In second quarter 2017, one of the SPEs entered into a short-term warehouse credit facility to fund the purchase of additional senior secured leveraged loans. The Company determined that both SPEs are VIEs and consolidated the SPEs because the Company was deemed to be the primary beneficiary of these entities due to (i) its affiliates' roles as collateral manager, which gives it the power to direct the activities that most significantly impact the economic performance of the entities, and (ii) its economic interest in the entity, which exposes it to losses and the right to receive benefits that could potentially be significant to the entities. In the consolidated balance sheet as of September 30, 2017, the Company recorded $349.7 in Other Assets and $279.7 in Accounts Payable and Other Liabilities related to the SPEs. Included in Other Assets is $340.7 of investments in senior secured leverage loans reported at fair value as well as $9.0 in accounts receivable related to unsettled senior secured leverage loan sales. Included in Accounts Payable and Other Liabilities is $157.7 of debt related to the warehouse credit facility and $122.0

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2017
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 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 following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016. The amounts presented below for Other investments, Cash equivalents, Other assets, Assets and Liabilities held in 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, American Security Insurance Company Investment Plan, Assurant Deferred Compensation Plan, modified coinsurance arrangements and other derivatives. Other liabilities are comprised of investments in the Assurant Investment Plan, 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. September 30, 2017 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 179.0 $ — $ 179.0 $ — State, municipalities and political subdivisions 384.7 — 384.7 — Foreign governments 583.4 1.0 582.4 — Asset-backed 137.4 — 11.0 126.4 (8) Commercial mortgage-backed 39.5 — 9.7 29.8 Residential mortgage-backed 1,147.3 — 1,147.3 — U.S. corporate 5,420.4 — 5,403.9 16.5 Foreign corporate 1,840.7 — 1,806.3 34.4 Equity securities: Common stocks 14.7 14.0 0.7 — Non-redeemable preferred stocks 388.6 — 386.3 2.3 Short-term investments 266.6 137.2 (2) 129.4 — Other investments 239.5 68.8 (1) 164.2 (3) 6.5 (4) Cash equivalents 622.2 557.2 (2) 65.0 (3) — Other assets: Assets of special purpose entities 340.7 — 340.7 (3)(7) — Other derivatives 3.8 — — 3.8 (5) Assets held in separate accounts 1,763.0 1,594.9 (1) 168.1 (3) — Total financial assets $ 13,371.5 $ 2,373.1 $ 10,778.7 $ 219.7 Financial Liabilities Other liabilities $ 134.0 $ 68.8 (1) $ 8.0 (5) $ 57.2 (6) Liabilities related to separate accounts 1,763.0 1,594.9 (1) 168.1 (3) — Total financial liabilities $ 1,897.0 $ 1,663.7 $ 176.1 $ 57.2 December 31, 2016 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 174.9 $ — $ 174.9 $ — State, municipalities and political subdivisions 476.1 — 476.1 — Foreign governments 568.5 1.0 567.5 — Asset-backed 3.7 — 3.7 — Commercial mortgage-backed 38.4 — 10.6 27.8 Residential mortgage-backed 1,101.3 — 1,101.3 — U.S. corporate 5,461.2 — 5,416.7 44.5 Foreign corporate 1,748.0 — 1,714.7 33.3 Equity securities: Common stocks 20.8 20.1 0.7 — Non-redeemable preferred stocks 400.6 — 398.4 2.2 Short-term investments 227.7 52.7 (2) 175.0 — Other investments 265.1 64.9 (1) 196.7 (3) 3.5 (4) Cash equivalents 646.6 644.6 (2) 2.0 (3) — Other assets 0.6 — 0.3 (5) 0.3 (5) Assets held in separate accounts 1,650.2 1,472.9 (1) 177.3 (3) — Total financial assets $ 12,783.7 $ 2,256.2 $ 10,415.9 $ 111.6 Financial Liabilities Other liabilities $ 119.9 $ 64.9 (1) $ 0.9 (5) $ 54.1 (6) Liabilities related to separate accounts 1,650.2 1,472.9 (1) 177.3 (3) — Total financial liabilities $ 1,770.1 $ 1,537.8 $ 178.2 $ 54.1 (1) Mainly includes mutual funds. (2) Mainly includes money market funds. (3) Mainly includes fixed maturity securities. (4) Mainly includes fixed maturity securities and other derivatives. (5) Mainly includes other derivatives. (6) Mainly includes contingent consideration liabilities related to business combinations and other derivatives. (7) Refer to Note 7 - Investments for additional information regarding 2017 activity. (8) The increase in asset-backed securities classified as Level 3 consists primarily of CLOs purchased in 2017. These securities were priced using independent and non-binding broker quotes as of September 30, 2017. The inputs factoring into the broker quotes include trades in the actual bond being priced, trades of comparable bonds, quality of the issuer, optionality, structure and liquidity. The following tables disclose the carrying value, fair value amount and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets: September 30, 2017 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 648.1 $ 664.1 $ — $ — $ 664.1 Policy loans 36.9 36.9 36.9 — — Other investments 40.4 40.4 — — 40.4 Total financial assets $ 725.4 $ 741.4 $ 36.9 $ — $ 704.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 644.7 $ 657.0 $ — $ — $ 657.0 Funds withheld under reinsurance 142.7 142.7 142.7 — — Liabilities of special purpose entities (2) 157.7 157.7 — 157.7 — Debt 1,067.9 1,174.0 — 1,174.0 — Total financial liabilities $ 2,013.0 $ 2,131.4 $ 142.7 $ 1,331.7 $ 657.0 December 31, 2016 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 624.0 $ 634.9 $ — $ — $ 634.9 Policy loans 38.5 38.5 38.5 — — Other investments 36.3 36.3 — — 36.3 Total financial assets $ 698.8 $ 709.7 $ 38.5 $ — $ 671.2 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 651.0 $ 680.4 $ — $ — $ 680.4 Funds withheld under reinsurance 111.7 111.7 111.7 — — Debt 1,067.0 1,159.7 — 1,159.7 — Total financial liabilities $ 1,829.7 $ 1,951.8 $ 111.7 $ 1,159.7 $ 680.4 (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. (2) Included as a component of Accounts payable and other liabilities on the consolidated balance sheet. Refer to Note 7 - Investments for additional information regarding 2017 amounts and activity. Reinsurance Recoverables Credit Disclosures A key credit quality indicator for reinsurance is the A.M. Best financial strength ratings 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 have not changed significantly since December 31, 2016. 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 $5.3 as of September 30, 2017 and $0.3

Reserves

Reserves	9 Months Ended
	Sep. 30, 2017
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 Nine Months Ended September 30, 2017 2016 Claims and benefits payable, at beginning of period $ 3,301.2 $ 3,896.7 Less: Reinsurance ceded and other (2,718.2 ) (1,496.5 ) Net claims and benefits payable, at beginning of period 583.0 2,400.2 Incurred losses and loss adjustment expenses related to: Current year 1,539.4 1,561.4 Prior year's interest — 9.9 Prior years (54.3 ) (176.3 ) Total incurred losses and loss adjustment expenses 1,485.1 1,395.0 Paid losses and loss adjustment expenses related to: Current year 954.5 1,151.7 Prior years 327.8 2,028.9 Total paid losses and loss adjustment expenses 1,282.3 3,180.6 Net claims and benefits payable, at end of period 785.8 614.6 Plus: Reinsurance ceded and other (1) 4,008.4 2,782.8 Claims and benefits payable, at end of period (1) $ 4,794.2 $ 3,397.4 (1) Global Housing's reinsurance recoverables and claims and benefits payable as of September 30, 2017 include $1,123.0 of balances ceded to the U.S. government under the voluntary National Flood Insurance Program. The Company experienced favorable development in both nine month periods presented in the roll forward table above. Favorable development in the nine months ended September 30, 2017 was comparatively lower than the nine months ended September 30, 2016, due primarily to the absence of the favorable development on the AEB business sold during the first quarter of 2016 and the runoff of the Assurant Health business. AEB contributed $42.5 to the favorable development during the nine months ended September 30, 2016. Assurant Health contributed $8.2 and $58.2 to the favorable development during the nine months ended September 30, 2017 and 2016, respectively. Global Housing and Global Lifestyle contributed $45.6 and $75.1 to the favorable development during the nine months ended September 30, 2017 and 2016, respectively. Overall, Global Housing favorable development decreased in 2017 due to the moderating favorable trend in theft and vandalism claims across lender-placed homeowners products, partially offset by $5.2 of favorable development related to Hurricane Matthew. Within Global Lifestyle, favorable development decreased among extended service contracts and credit insurance products, some of

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
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): Three Months Ended September 30, 2017 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at June 30, 2017 $ (284.6 ) $ 565.6 $ 18.8 $ (62.9 ) $ 236.9 Change in accumulated other comprehensive (loss) income before reclassifications 27.6 (4.2 ) (1.0 ) — 22.4 Amounts reclassified from accumulated other comprehensive (loss) income — (3.5 ) — 0.6 (2.9 ) Net current-period other comprehensive income (loss) 27.6 (7.7 ) (1.0 ) 0.6 19.5 Balance at September 30, 2017 $ (257.0 ) $ 557.9 $ 17.8 $ (62.3 ) $ 256.4 Three Months Ended September 30, 2016 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at June 30, 2016 $ (273.4 ) $ 641.2 $ 21.3 $ (62.0 ) $ 327.1 Change in accumulated other comprehensive (loss) income before reclassifications (15.9 ) 19.6 0.3 — 4.0 Amounts reclassified from accumulated other comprehensive (loss) income — (3.3 ) — 0.2 (3.1 ) Net current-period other comprehensive (loss) income (15.9 ) 16.3 0.3 0.2 0.9 Balance at September 30, 2016 $ (289.3 ) $ 657.5 $ 21.6 $ (61.8 ) $ 328.0 Nine Months Ended September 30, 2017 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2016 $ (322.1 ) $ 459.3 $ 20.6 $ (63.2 ) $ 94.6 Change in accumulated other comprehensive (loss) income before reclassifications 65.1 112.9 (2.8 ) — 175.2 Amounts reclassified from accumulated other comprehensive (loss) income — (14.3 ) — 0.9 (13.4 ) Net current-period other comprehensive income (loss) 65.1 98.6 (2.8 ) 0.9 161.8 Balance at September 30, 2017 $ (257.0 ) $ 557.9 $ 17.8 $ (62.3 ) $ 256.4 Nine Months Ended September 30, 2016 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2015 $ (270.7 ) $ 495.4 $ 22.4 $ (128.6 ) $ 118.5 Change in accumulated other comprehensive (loss) income before reclassifications (18.6 ) 265.8 (1.1 ) 85.0 331.1 Amounts reclassified from accumulated other comprehensive (loss) income — (103.7 ) 0.3 (18.2 ) (121.6 ) Net current-period other comprehensive (loss) income (18.6 ) 162.1 (0.8 ) 66.8 209.5 Balance at September 30, 2016 $ (289.3 ) $ 657.5 $ 21.6 $ (61.8 ) $ 328.0 The following tables summarize the reclassifications out of accumulated other comprehensive income for the three and nine months ended September 30, 2017 and 2016: 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 September 30, 2017 2016 Net unrealized gains on securities $ (5.3 ) $ (5.0 ) Net realized gains on investments, excluding other-than-temporary impairment losses 1.8 1.8 Provision for income taxes $ (3.5 ) $ (3.2 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.9 $ 0.3 (1) 0.9 0.3 Total before tax (0.3 ) (0.1 ) Provision for income taxes $ 0.6 $ 0.2 Net of tax Total reclassifications for the period $ (2.9 ) $ (3.0 ) 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 Nine Months Ended September 30, 2017 2016 Net unrealized gains on securities $ (22.0 ) $ (159.6 ) Net realized gains on investments, excluding other-than-temporary impairment losses 7.7 55.9 Provision for income taxes (14.3 ) (103.7 ) Net of tax OTTI — 0.5 Portion of net loss recognized in other comprehensive income, before taxes — (0.2 ) Provision for income taxes $ — $ 0.3 Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Settlement gain $ (0.6 ) $ — Settlement gain Amortization of net loss 2.0 1.5 (1) Gain on pension plan curtailment — (29.6 ) Gain on pension plan curtailment 1.4 (28.1 ) Total before tax (0.5 ) 9.9 Provision for income taxes 0.9 (18.2 ) Net of tax Total reclassifications for the period $ (13.4 ) $ (121.6 ) Net of tax (1)

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation Under the Assurant, Inc. Long-Term Equity Incentive Plan (“ALTEIP”), as amended and restated in May 2017, the Company is authorized to issue up to 6,800,000 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 nine months ended September 30, 2017 and 2016: Three Months Ended Nine Months Ended 2017 2016 2017 2016 RSU compensation expense $ 6.3 $ 6.2 $ 17.1 $ 15.0 Income tax benefit (2.2 ) (2.2 ) (6.0 ) (5.3 ) RSU compensation expense, net of tax $ 4.1 $ 4.0 $ 11.1 $ 9.7 RSUs granted 31,720 41,756 236,919 351,850 Weighted average grant date fair value per unit $ 103.64 $ 88.13 $ 99.77 $ 79.45 Total fair value of vested RSUs $ 2.4 $ 3.7 $ 26.2 $ 25.0 As of September 30, 2017, there was $20.9 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 nine months ended September 30, 2017 and 2016: Three Months Ended Nine Months Ended 2017 2016 2017 2016 PSU compensation expense $ 4.9 $ 9.1 $ 5.0 $ 13.3 Income tax benefit (1.7 ) (3.2 ) (1.7 ) (4.7 ) PSU compensation expense, net of tax $ 3.2 $ 5.9 $ 3.3 $ 8.6 PSUs granted 336 12,700 237,959 271,346 Weighted average grant date fair value per unit $ 112.32 $ 91.12 $ 112.32 $ 81.30 Total fair value of vested PSUs $ 0.3 $ 2.0 $ 29.7 $ 31.3 Portions of the compensation expense recorded in prior years were reversed in the nine months ended September 30, 2017 related to the Company’s level of actual performance as measured against pre-established performance goals and peer group results. As of September 30, 2017, there was $23.7 of unrecognized compensation cost related to outstanding PSUs. That cost is expected to be recognized over a weighted-average period of 1.0 year. The fair value of PSUs with market conditions was estimated on the date of grant using a Monte Carlo simulation model, which utilizes multiple variables that determine the probability of satisfying the market condition stipulated in the award. Expected volatilities for awards issued during the nine months ended September 30, 2017 and 2016 were based on the historical stock prices of the Company’s stock and peer group. The expected term for grants issued during the nine months ended September 30, 2017 and 2016 was assumed to equal the average of the vesting period of the PSUs. The risk-free rate was based on the U.S. Treasury yield curve in effect at the time of grant. In May 2017, the Company modified its outstanding 2015 PSU awards (except those awarded to executive officers of the Company, as defined in Section 16 of the Exchange Act) to adjust the revenue growth metric for a change in program structure for a large service contract client, which impacted the accounting for revenues on a net instead of a gross basis. The 2015 PSU awards were previously modified in 2016, along with the 2014 PSU awards, to exclude the AEB and Assurant Health segment revenue from the revenue growth metric as a result of the Company's exit of the health insurance market in 2016 and the sale of Assurant Employee Benefits on March 1, 2016. All other terms of the awards remained unchanged. As a result of these changes, the net incremental (expense) benefit recognized in the three and nine months ended September 30, 2017 was $(0.1) and $0.7

Stock Repurchase

Stock Repurchase	9 Months Ended
	Sep. 30, 2017
Class of Stock Disclosures [Abstract]
Stock Repurchase	Stock Repurchase During the nine months ended September 30, 2017, the Company repurchased 2,535,457 shares of the Company’s outstanding common stock at a cost of $250.5 , exclusive of commissions, leaving $432.4 remaining under the total repurchase authorization as of September 30, 2017.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2017
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. Three Months Ended Nine Months Ended 2017 2016 2017 2016 Numerator Net (loss) income $ (57.3 ) $ 144.4 $ 206.7 $ 534.1 Deduct dividends paid (28.8 ) (30.1 ) (88.8 ) (95.1 ) Undistributed (loss) earnings $ (86.1 ) $ 114.3 $ 117.9 $ 439.0 Denominator Weighted average shares outstanding used in basic earnings per share 54,524,874 60,262,073 55,096,933 62,522,980 Incremental common shares from: PSUs — 566,268 312,275 570,340 Employee Stock Purchase Program — — 43 — Weighted average shares used in diluted earnings per share calculations 54,524,874 60,828,341 55,409,251 63,093,320 Earnings per common share - Basic Distributed earnings $ 0.53 $ 0.50 $ 1.61 $ 1.52 Undistributed (loss) earnings (1.58 ) 1.90 2.14 7.02 Net (loss) income $ (1.05 ) $ 2.40 $ 3.75 $ 8.54 Earnings per common share - Diluted (1) Distributed earnings $ 0.53 $ 0.49 $ 1.60 $ 1.50 Undistributed (loss) earnings (1.58 ) 1.88 2.13 6.96 Net (loss) income $ (1.05 ) $ 2.37 $ 3.73 $ 8.46 (1) In accordance with earnings per share guidance, diluted per share amounts are computed in the same manner as basic per share amounts when a loss from operations exists. Average PSUs totaling 5,301 for the three months ended September 30, 2016, and 68,439 and 6,449

Retirement and Other Employee B

Retirement and Other Employee Benefits	9 Months Ended
	Sep. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement and Other Employee Benefits	Retirement and Other Employee Benefits The components of net periodic benefit (gain) cost for the Company’s qualified pension benefits plan, nonqualified pension benefits plan and retirement health benefits plan for the three and nine months ended September 30, 2017 and 2016 were as follows: Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Three Months Ended September 30, For the Three Months Ended September 30, For the Three Months Ended September 30, 2017 Plan 1 2017 Plan 2 2016 Plan 1 2016 Plan 2 2017 2016 2017 2016 Service cost $ — $ — $ 1.4 $ — $ — $ 0.2 $ — $ — Interest cost 2.5 3.2 3.3 3.5 0.7 0.9 0.9 0.9 Expected return on plan assets (5.4 ) (6.7 ) (5.5 ) (8.2 ) — — (0.8 ) (0.8 ) Amortization of net loss — 0.4 — 0.2 0.5 0.1 — — Net periodic benefit (gain) cost $ (2.9 ) $ (3.1 ) $ (0.8 ) $ (4.5 ) $ 1.2 $ 1.2 $ 0.1 $ 0.1 Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Nine Months Ended September 30, For the Nine Months Ended September 30, For the Nine Months Ended September 30, 2017 Plan 1 2017 Plan 2 2016 Plan 1 2016 Plan 2 2017 2016 2017 2016 Service cost $ — $ — $ 1.4 $ — $ — $ 0.4 $ — $ — Interest cost 8.3 9.4 10.1 10.5 2.2 2.7 2.6 2.6 Expected return on plan assets (17.6 ) (20.3 ) (21.1 ) (20.0 ) — — (2.3 ) (2.3 ) Amortization of net loss — 1.0 — 0.8 1.0 0.7 — — Curtailment/settlement gain — — (23.1 ) — (0.6 ) (2.3 ) — (4.2 ) Net periodic benefit (gain) cost $ (9.3 ) $ (9.9 ) $ (32.7 ) $ (8.7 ) $ 2.6 $ 1.5 $ 0.3 $ (3.9 ) Assurant's qualified and non-qualified pension benefit plans were frozen on March 1, 2016. The Assurant Pension Plan's (the "Plan") funded status increased to $83.1 at September 30, 2017 from $77.0 (based on the fair value of the assets compared to the accumulated benefit obligation) at December 31, 2016. This equates to a 112% and 111% funded status at September 30, 2017 and December 31, 2016, respectively. During the first nine months of 2017, no cash was contributed to the Plan. Due to the Plan's current funded status, no

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
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 $18.4 and $17.2 of letters of credit outstanding as of September 30, 2017 and December 31, 2016, respectively. Legal and Regulatory Matters In January 2015, at the request of the Indiana Department of Insurance, the National Association of Insurance Commissioners (the "NAIC") authorized a multistate targeted market conduct examination regarding the Company's lender placed insurance products. Various underwriting companies, including American Security Insurance Company, were subject to the examination. In December 2016, the Company reached a Regulatory Settlement Agreement (the "RSA") with the participating regulators to resolve the issues raised in the market conduct examination and a separate agreement with the Minnesota Department of Commerce to settle its lender-placed insurance market conduct examination (together with the RSA, the “Settlement Agreements”). The terms of the Settlement Agreements took effect in the first quarter of 2017. They resolve outstanding regulatory matters related to lender-placed insurance within the scope of the examinations and align lender-placed business practices with procedures already implemented across much of the Company’s lender-placed business. In April 2017, the Company paid $85.0 to the participating jurisdictions for examination, compliance and monitoring costs. In accordance with the RSA, the Company is required to re-file its lender-placed insurance rates at least once every 4 years, and modify certain lender-placed business practices to which other significant providers in the lender-placed market will also be subject. The state insurance regulatory agencies have also imposed similar requirements and restrictions on other existing writers of lender-placed insurance and future entrants. In addition, as previously disclosed, the Company is involved in a variety of litigation 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 seek premium refunds and other relief. The Company continues to defend itself vigorously in these class actions. We have participated and may participate in settlements on terms that we consider reasonable given the strength of our defenses and other factors. The Company has established an accrued liability for various legal and regulatory proceedings. However, 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 action, 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 currently available information, management does not believe that the pending matters are likely to have a material adverse effect, individually or in the aggregate, on the Company’s financial condition. Guaranty Fund Assessments Under state guaranty association laws, certain insurance companies can be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of impaired or insolvent insurance companies that write the same line or similar lines of business. In 2009, the Pennsylvania Insurance Commissioner (the “Commissioner”) placed long-term care insurer Penn Treaty Network America Insurance Company and one of its subsidiaries (collectively, “Penn Treaty”) in rehabilitation, an intermediate action before insolvency, and subsequently petitioned a state court to convert the rehabilitation into a liquidation. In 2012, the state court denied the Commissioner’s petition for liquidation. The Pennsylvania Supreme Court affirmed that ruling in July 2015. The state court’s 2012 order directed the Commissioner to develop a plan of rehabilitation. The Commissioner filed an initial rehabilitation plan in April 2013, and filed amended plans in August 2014 and October 2014. The state court began a hearing in July 2015, which is ongoing, to consider the Commissioner’s most recent proposed rehabilitation plan, which contemplates a partial liquidation of Penn Treaty. Given developments in 2016, and the apparent inevitable liquidation of Penn Treaty, the Company accrued $12.5 for its estimated share of guaranty association assessments in the fourth quarter of 2016. In March 2017, the order of liquidation was granted. During the nine months ended September 30, 2017, the Company paid $2.3 to state guaranty funds for Penn Treaty. During the same period, the Company incurred an additional $0.8 of expense related to Penn Treaty due to a revised estimated total loss liability and has a net liability of $11.0

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the nine months ended September 30, 2017, the Company recorded net tax benefits of $9.6 in the Global Lifestyle segment. The tax benefit was driven by two factors, including an international restructuring, in which there will be a dividend and release of foreign tax credits which will result in a future tax benefit of $6.2 , as well as a reduction in a valuation allowance of $3.4 for an international subsidiary due to improved outlook. The benefit for these future credits has been reflected in the provision for income taxes line item in the consolidated statements of operations. During the nine months ended September 30, 2016, the Company recorded a net tax benefit of $18.0

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Warranty Group Acquisition On October 17, 2017, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement"), with TWG Holdings Limited, a Bermuda limited company (“TWG Holdings,” and together with its subsidiaries, “TWG”), TWG Re, Ltd., a corporation incorporated in the Cayman Islands, and Arbor Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of TWG Holdings (“Merger Sub”). Under the terms of the Merger Agreement and subject to the satisfaction or waiver of the conditions therein, Assurant and TWG will combine their businesses through a transaction in which Merger Sub will merge with and into Assurant, with Assurant continuing as the surviving corporation and a wholly owned subsidiary of TWG Holdings (the “Merger”). TWG is a global provider of protection plans and related programs and a portfolio company of TPG Capital. As a result of the Merger and related transactions, each issued and outstanding share of Assurant common stock will be cancelled and converted automatically into the right to receive one ordinary share of TWG Holdings and the equityholders of TWG Holdings will receive approximately $372.4 in cash and retain approximately 16,000,000 ordinary shares in the aggregate (equal in value to 16,000,000 Assurant shares, or approximately $1,500.0 based on the Assurant closing price on October 17, 2017), in each case subject to the adjustments set forth in the Merger Agreement. The transaction values TWG at approximately $1,900.0 in equity value, or approximately $2,500.0 of enterprise value, including TWG's existing debt. The Company intends to finance the cash consideration and repayment of approximately $591.3 of TWG’s existing debt through new debt, and preferred securities expected to be issued after closing. The Company entered into commitment letters with Morgan Stanley Senior Funding, Inc. (“Morgan Stanley”), each dated as of October 17, 2017, pursuant to which Morgan Stanley has (i) committed to provide to the Company, subject to the terms and conditions set forth therein, the full amount of a 364-day $1,000.0 senior unsecured bridge loan facility and (ii) agreed to use commercially reasonable efforts to arrange a syndicate of lenders that will provide to the Company a 364-day senior unsecured term loan facility in an aggregate principal amount of up to $350.0 and committed to provide to the Company $70.0 of the term facility. Following the consummation of the Merger, current stockholders of Assurant will own approximately 77% of TWG Holdings and current shareholders of TWG Holdings will own approximately 23% . Under applicable accounting principles, Assurant will be regarded as the acquiring entity. At the effective time of the Merger, TWG Holdings will change its name to Assurant Ltd. and will trade under the ticker symbol “AIZ”. The transaction is expected to close in the first half of 2018, subject to shareholder and regulatory approvals, and other customary closing conditions. California Wildfires The Company expects to record between $6.0 - $8.0 pre-tax of reportable catastrophe losses related to the California wildfires that occurred in October for the fourth quarter 2017. Reportable catastrophe losses include only individual catastrophic events that generated losses to the Company in excess of $5.0

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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 September 30, 2017 and for the three and nine months ended September 30, 2017 and 2016 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. Certain prior period amounts have been reclassified to conform to the 2017 presentation.
Recent Accounting Pronouncements	Adopted Amortization period of premiums associated with callable debt : On April 1, 2017, the Company early adopted the amended guidance to shorten the amortization period of premiums on certain purchased callable debt securities to the earliest call date. Such guidance would have been required to be adopted in 2019. Since the Company’s current policy is to amortize premiums on callable debt securities to the earliest call date, at the date of adoption there was no impact to the Company’s financial position or results of operations. Goodwill impairment testing : On January 1, 2017, the Company adopted the amended guidance on goodwill impairment testing. Under the amended guidance, the optional qualitative assessment (Step 0) and the first step of the quantitative assessment (Step 1) remain unchanged. Step 2 is eliminated. As a result, for annual impairment testing or in the event a test is required prior to the annual test, the Company will use Step 1 to determine both the existence and amount of goodwill impairment. An impairment loss will be recognized for the amount by which the reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill in that reporting unit. The Company is adopting this guidance on a prospective basis as a change in accounting principle, therefore at the date of adoption there is no impact to the Company’s financial position or results of operations. Employee share-based stock compensation : On January 1, 2017, the Company adopted the amended guidance on accounting for employee share-based stock compensation. The updated guidance simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows, and accounting for forfeitures. Upon adoption the Company recognizes excess tax benefits or deficiencies in net income, as well as the related cash flows in operating activities, on a prospective basis. The earnings impact of the adoption did not have a material impact on the Company’s financial results of operations. The updated guidance allows companies a policy election with regard to forfeitures and the Company has elected to continue its existing practice of estimating the number of awards that will be forfeited. As required in the updated guidance, the Company will present cash flows related to employee withholding taxes as financing activities as opposed to operating activities, on a retrospective basis, which resulted in the reclassification of $18.2 and $25.0 in the consolidated statements of cash flows for the periods ending September 30, 2017 and 2016, respectively. Not Yet Adopted Income tax consequences for intra-entity transfers of assets : In October 2016, the FASB issued amended guidance on tax accounting for intra-entity transfers of assets. Current guidance prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The amendments require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Also, the amended guidance eliminates the exception for an intra-entity transfer of an asset other than inventory. The amended guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. Early adoption is permitted. The adoption of this amended guidance will not have an impact on the Company’s financial position and results of operations. Statement of cash flows presentation and classification : In August 2016, the FASB issued amended guidance on presentation and classification in the statement of cash flows. The amendments address certain specific cash flow issues: debt prepayment and debt extinguishment costs; settlement of zero-coupon or insignificant coupon debt instruments; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and guidance related to the identification of the primary source for separately identifiable cash flows. The amended guidance is effective in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. The adoption of this amended guidance will not have an impact on the Company’s financial position and results of operations. Reporting credit losses of assets held at amortized cost : In June 2016, the 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 amended guidance is effective in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2020. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the requirements of this amended guidance and the potential impact on the Company’s financial position and results of operations. Lease accounting : In February 2016, the FASB issued new guidance on leases, which replaces the current lease guidance. The new guidance requires that entities recognize the assets and liabilities associated with leases on the balance sheet and disclose key information about leasing arrangements. The new guidance is effective in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2019. Early adoption is permitted. The Company is evaluating the requirements of this new lease guidance and the potential impact on the Company’s financial position and results of operations. Financial instruments measurement and classification : In January 2016, the FASB issued amended guidance on the measurement and classification of financial instruments. This amended guidance requires that all equity investments be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option has been elected for financial liabilities. The amendments eliminate the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, however public business entities will be required to use the exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. In addition, the new guidance requires financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. The amended guidance is effective in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Therefore, the Company is required to adopt the guidance on January 1, 2018. Upon adoption, all common and preferred stocks will be measured at fair value through the income statement. For certain private equity investments recorded in Other investments, the Company will elect the measurement alternative to record these investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer. The measurement alternative will be applied on a prospective basis. The potential impact of this amended measurement and classification of financial instruments guidance on the Company’s financial position and results of operations will be determined based on the market values of the common and preferred stocks on the date of adoption. Revenue recognition from contracts with customers : In May 2014, the FASB issued amended guidance on revenue recognition from contracts with customers, which is required to be implemented in 2018 for public companies. Further amendments and technical corrections were made to the amended guidance during 2016 and 2017. The amended guidance, which the Company will adopt effective January 1, 2018, affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. Insurance and similar contracts issued by insurance entities are within the scope of other standards and therefore are specifically excluded from the scope of the amended revenue recognition guidance. The amended guidance creates a five step approach that emphasizes the recognition of revenue when the performance obligations are met in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity expects to receive. This guidance may be adopted using the full retrospective method, whereby the amended guidance is applied to each prior period presented, and the cumulative effect of applying the amended guidance is recognized at the beginning of the earliest period presented or the modified retrospective approach, whereby the cumulative effect of applying the amended guidance is recognized at the beginning of the year of adoption and the comparative information is not restated and continues to be reported under the accounting standards in effect for those periods. The Company is nearing completion of its process to implement the guidance, which has included assessment of industry and technical developments and interpretations. The Company has assessed its revenue streams to identify those contracts that may be subject to the new standard. The Company had previously identified that up to 40% of its 2016 reported revenues required assessment under the new standard, including its fee based revenue contracts as well as its extended service warranty contracts. Based on the Company’s ongoing evaluation of its products and issuing entities, the adjusted in-scope revenues are now estimated to be just under 20% of 2016 reported revenues. The Company selected a representative sample of contracts from the in-scope product lines for review (“key contracts”) to identify revenues that should be separately disclosed or earned using a different recognition period. The review of such key contracts is complete. The Company grouped the remaining contracts with similar features based on the conclusions reached with the key contracts reviewed and is finalizing the additional review of specific contracts with unique features that require separate assessment. Based on the work completed to date, the Company does not expect the implementation of the amended guidance to have a material impact on the timing of revenue recognition for its in-scope revenue streams, therefore the Company does not expect the amended revenue recognition standard to have a material impact on its financial position, results of operations and related disclosures. However, the in-scope revenues will be subject to additional disclosure requirements pursuant to the standard.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Financial Information by Segment	The following tables summarize selected financial information by segment: Three Months Ended September 30, 2017 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 423.0 $ 636.0 $ 14.0 $ — $ 0.1 $ 0.1 $ 1,073.1 Fees and other income 107.3 205.7 30.6 4.5 1.0 5.5 349.1 Net investment income 23.6 33.1 66.4 8.6 0.9 9.5 132.6 Net realized gains on investments — — — 8.5 — 8.5 8.5 Amortization of deferred gains and gains on disposal of businesses (1) — — — 23.1 — 23.1 23.1 Total revenues 553.9 874.8 111.0 44.7 2.0 46.7 1,586.4 Benefits, losses and expenses Policyholder benefits (2) 436.7 190.6 62.6 — (7.7 ) (7.7 ) 682.2 Amortization of deferred acquisition costs and value of business acquired 49.7 266.1 16.7 — — — 332.5 Underwriting, general and administrative expenses (3) 235.0 371.9 13.3 38.2 8.7 46.9 667.1 Interest expense — — — 12.2 — 12.2 12.2 Total benefits, losses and expenses 721.4 828.6 92.6 50.4 1.0 51.4 1,694.0 Segment (loss) income before (167.5 ) 46.2 18.4 (5.7 ) 1.0 (4.7 ) (107.6 ) (Benefit) provision for income (57.2 ) 3.6 6.1 (3.7 ) 0.9 (2.8 ) (50.3 ) Segment (loss) income after tax $ (110.3 ) $ 42.6 $ 12.3 $ (2.0 ) $ 0.1 $ (1.9 ) Net loss $ (57.3 ) Three Months Ended September 30, 2016 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 457.4 $ 742.0 $ 15.2 $ — $ 0.5 $ 0.5 $ 1,215.1 Fees and other income 121.6 185.8 28.0 7.3 5.0 12.3 347.7 Net investment income 17.0 27.4 68.0 10.8 1.6 12.4 124.8 Net realized gains on investments — — — 10.7 — 10.7 10.7 Amortization of deferred gains and gains on disposal of businesses (1) — — — 135.8 — 135.8 135.8 Total revenues 596.0 955.2 111.2 164.6 7.1 171.7 1,834.1 Benefits, losses and expenses Policyholder benefits (2) 218.6 180.1 60.9 — (24.4 ) (24.4 ) 435.2 Amortization of deferred acquisition costs and value of business acquired 52.1 263.0 15.2 — — — 330.3 Underwriting, general and administrative expenses (3) 260.7 470.0 14.3 57.2 31.5 88.7 833.7 Interest expense — — — 14.0 — 14.0 14.0 Total benefits, losses and expenses 531.4 913.1 90.4 71.2 7.1 78.3 1,613.2 Segment income before provision for income tax 64.6 42.1 20.8 93.4 — 93.4 220.9 Provision for income taxes 20.1 13.8 6.4 34.5 1.7 36.2 76.5 Segment income (loss) after tax $ 44.5 $ 28.3 $ 14.4 $ 58.9 $ (1.7 ) $ 57.2 Net income $ 144.4 (1) The three months ended September 30, 2017 and 2016 include $20.4 and $132.9 , respectively, related to the amortization of deferred gains and gains related to the AEB sale on March 1, 2016. (2) The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the three months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $6.9 and $21.6 , respectively, through an offset to policyholder benefits expense. In addition, there was favorable claims development experienced through September 30, 2017, in excess of actual benefit expense, which contributed to the credit balance within policyholder benefits expenses. (3) The three months ended September 30, 2017 and 2016 for Corporate & Other includes expense of $4.5 and $18.0 , respectively, related to a post-close adjustment pertaining to an estimated indemnification that is expected to be due on a previous disposition. Nine Months Ended September 30, 2017 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Consolidated Revenues Net earned premiums $ 1,301.8 $ 1,887.8 $ 43.8 $ — $ 5.3 $ 5.3 $ 3,238.7 Fees and other income 310.4 594.8 91.3 16.3 3.4 19.7 1,016.2 Net investment income 59.6 86.0 195.6 28.0 5.7 33.7 374.9 Net realized gains on investments — — — 25.1 — 25.1 25.1 Amortization of deferred gains and gains on disposal of businesses (1) — — — 83.5 — 83.5 83.5 Total revenues 1,671.8 2,568.6 330.7 152.9 14.4 167.3 4,738.4 Benefits, losses and expenses Policyholder benefits (2) 788.2 517.3 190.7 — (39.6 ) (39.6 ) 1,456.6 Amortization of deferred acquisition costs and value of business acquired 147.4 800.7 45.6 — — — 993.7 Underwriting, general and administrative expenses (3) 723.2 1,067.2 42.5 95.7 36.1 131.8 1,964.7 Interest expense — — — 37.2 — 37.2 37.2 Total benefits, losses and expenses 1,658.8 2,385.2 278.8 132.9 (3.5 ) 129.4 4,452.2 Segment income before provision for income tax 13.0 183.4 51.9 20.0 17.9 37.9 286.2 Provision for income taxes 5.2 48.2 16.9 2.8 6.4 9.2 79.5 Segment income after tax $ 7.8 $ 135.2 $ 35.0 $ 17.2 $ 11.5 $ 28.7 Net income $ 206.7 As of September 30, 2017 Segment assets: $ 5,609.1 $ 9,447.8 $ 6,897.9 $ 10,325.9 $ 124.5 $ 10,450.4 $ 32,405.2 Nine Months Ended September 30, 2016 Total Corporate & Other Global Housing Global Lifestyle Global Preneed Corporate & Other Health Total Employee Benefits Consolidated Revenues Net earned premiums $ 1,378.3 $ 2,204.4 $ 47.0 $ — $ 24.9 $ 24.9 $ 178.0 $ 3,832.6 Fees and other income 339.2 572.6 82.2 17.1 18.4 35.5 4.2 1,033.7 Net investment income 53.2 80.6 192.0 29.7 7.5 37.2 17.3 380.3 Net realized gains on investments (4) — — — 194.0 — 194.0 — 194.0 Amortization of deferred gains and gains on disposal of businesses (1) — — — 309.2 — 309.2 — 309.2 Gain on pension plan curtailment — — — 29.6 — 29.6 — 29.6 Total revenues 1,770.7 2,857.6 321.2 579.6 50.8 630.4 199.5 5,779.4 Benefits, losses and expenses Policyholder benefits (2) 600.8 503.2 186.8 — (29.4 ) (29.4 ) 118.4 1,379.8 Amortization of deferred acquisition costs and value of business acquired 171.2 783.5 46.8 — — — 5.8 1,007.3 Underwriting, general and 734.0 1,420.3 41.1 178.5 122.2 300.7 58.5 2,554.6 Interest expense — — — 43.7 — 43.7 — 43.7 Total benefits, losses and expenses 1,506.0 2,707.0 274.7 222.2 92.8 315.0 182.7 4,985.4 Segment income (loss) before provision (benefit) for income tax 264.7 150.6 46.5 357.4 (42.0 ) 315.4 16.8 794.0 Provision (benefit) for income taxes 86.9 30.8 15.1 128.5 (7.7 ) 120.8 6.3 259.9 Segment income (loss) after tax $ 177.8 $ 119.8 $ 31.4 $ 228.9 $ (34.3 ) $ 194.6 $ 10.5 Net income $ 534.1 (1) The nine months ended September 30, 2017 and 2016 include $75.2 and $300.4 , respectively, related to the amortization of deferred gains and gains related to the AEB sale on March 1, 2016. (2) The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the nine months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $28.8 and $20.2 , respectively, through an offset to policyholder benefit expense. In addition, there was favorable claims development experienced through September 30, 2017, in excess of actual benefit expense, which contributed to the credit balance within policyholder benefits expenses. (3) The nine months ended September 30, 2016 for Corporate and Other includes a $16.7 intangible asset impairment charge related to trade names that will no longer be used or defended by the Company, and the nine months ended September 30, 2017 and 2016, for Corporate and Other includes expense of $6.0 and $18.0 , respectively, related to post-close adjustment pertaining to an estimated indemnification that is expected to be due on a previous disposition. (4) Nine months ended September 30, 2016 includes $146.7

Dispositions (Tables)

Dispositions (Tables)	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Gain by Transaction Component	The following represents a summary of the pre-tax gain recognized during the three and nine months ended September 30, 2017 and 2016 by transaction component, as well as the related classification within the financial statements: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Gain on sale of entities, net of transaction costs $ — $ — $ — $ 41.1 Novations, resulting in recognized gains (a) — — — 60.9 Loss on retroactive reinsurance component, before realized gains (b) — — — (128.7 ) Net loss prior to realized gains on transferred securities supporting retroactive component (c) — — — (26.7 ) Realized gains on transferred securities supporting retroactive component (b) — — — 146.7 Amortization of deferred gains (d) 20.4 132.9 75.2 300.4 Total $ 20.4 $ 132.9 $ 75.2 $ 420.4 (a) Novations of certain insurance policies directly to Sun Life allowed for immediate gain recognition. (b) Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the consolidated statements of operations. (c) Amount classified within underwriting, general and administrative expenses in the consolidated statements of operations. (d) Amount classified as amortization of deferred gains and gains on disposal of businesses within the consolidated statements of operations. The nine months ended September 30, 2017 amount includes subsequent novations of $1.4

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2017
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 accumulated other comprehensive income of the Company's fixed maturity and equity securities as of the dates indicated: September 30, 2017 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (a) Fixed maturity securities: U.S. government and government agencies and authorities $ 176.1 $ 3.5 $ (0.6 ) $ 179.0 $ — States, municipalities and political subdivisions 357.2 27.6 (0.1 ) 384.7 — Foreign governments 525.8 58.4 (0.8 ) 583.4 — Asset-backed 136.3 1.3 (0.2 ) 137.4 1.0 Commercial mortgage-backed 40.1 0.2 (0.8 ) 39.5 — Residential mortgage-backed 1,114.4 38.9 (6.0 ) 1,147.3 11.1 U.S. corporate 4,856.1 569.6 (5.3 ) 5,420.4 15.3 Foreign corporate 1,682.9 165.9 (8.1 ) 1,840.7 — Total fixed maturity securities $ 8,888.9 $ 865.4 $ (21.9 ) $ 9,732.4 $ 27.4 Equity securities: Common stocks $ 7.0 $ 7.7 $ — $ 14.7 $ — Non-redeemable preferred stocks 341.7 47.2 (0.3 ) 388.6 — Total equity securities $ 348.7 $ 54.9 $ (0.3 ) $ 403.3 $ — December 31, 2016 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value OTTI in AOCI (a) Fixed maturity securities: U.S. government and government agencies and authorities $ 172.8 $ 3.4 $ (1.3 ) $ 174.9 $ — States, municipalities and political subdivisions 446.9 29.6 (0.4 ) 476.1 — Foreign governments 508.9 60.5 (0.9 ) 568.5 — Asset-backed 2.6 1.2 (0.1 ) 3.7 1.1 Commercial mortgage-backed 39.3 0.1 (1.0 ) 38.4 — Residential mortgage-backed 1,071.2 38.1 (8.0 ) 1,101.3 12.8 U.S. corporate 5,022.7 454.1 (15.6 ) 5,461.2 15.6 Foreign corporate 1,606.4 147.2 (5.6 ) 1,748.0 2.2 Total fixed maturity securities $ 8,870.8 $ 734.2 $ (32.9 ) $ 9,572.1 $ 31.7 Equity securities: Common stocks $ 11.9 $ 8.9 $ — $ 20.8 $ — Non-redeemable preferred stocks 369.9 31.8 (1.1 ) 400.6 — Total equity securities $ 381.8 $ 40.7 $ (1.1 ) $ 421.4 $ — (a)
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 September 30, 2017 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 $ 243.8 $ 246.4 Due after one year through five years 1,709.4 1,768.0 Due after five years through ten years 1,847.2 1,933.4 Due after ten years 3,797.7 4,460.4 Total 7,598.1 8,408.2 Asset-backed 136.3 137.4 Commercial mortgage-backed 40.1 39.5 Residential mortgage-backed 1,114.4 1,147.3 Total $ 8,888.9 $ 9,732.4
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 as follows: Three Months Ended Nine Months Ended 2017 2016 2017 2016 Net realized gains (losses) related to sales and other: Fixed maturity securities $ 2.3 $ 8.7 $ 16.8 $ 154.5 Equity securities 3.0 (0.2 ) 6.8 12.9 Commercial mortgage loans on real estate — 0.1 — 21.6 Other investments 3.6 2.1 2.4 5.7 Total net realized gains related to sales and other (a) 8.9 10.7 26.0 194.7 Net realized losses related to other-than-temporary impairments: Fixed maturity securities — — (0.4 ) (0.7 ) Other investments (0.4 ) — (0.5 ) — Total net realized losses related to other-than- temporary impairments (0.4 ) — (0.9 ) (0.7 ) Total net realized gains $ 8.5 $ 10.7 $ 25.1 $ 194.0 (a) Nine months ended September 30, 2016 net gains includes $146.7
Investment Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities	The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities and equity securities as of September 30, 2017 and December 31, 2016 were as follows: September 30, 2017 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 $ 99.6 $ (0.5 ) $ 4.7 $ (0.1 ) $ 104.3 $ (0.6 ) States, municipalities and political subdivisions — — 2.4 (0.1 ) 2.4 (0.1 ) Foreign governments 49.0 (0.8 ) — — 49.0 (0.8 ) Asset-backed 26.3 (0.2 ) — — 26.3 (0.2 ) Commercial mortgage-backed 17.5 (0.7 ) 12.3 (0.1 ) 29.8 (0.8 ) Residential mortgage-backed 282.7 (5.0 ) 31.6 (1.0 ) 314.3 (6.0 ) U.S. corporate 445.7 (4.7 ) 26.9 (0.6 ) 472.6 (5.3 ) Foreign corporate 387.8 (7.8 ) 7.7 (0.3 ) 395.5 (8.1 ) Total fixed maturity securities $ 1,308.6 $ (19.7 ) $ 85.6 $ (2.2 ) $ 1,394.2 $ (21.9 ) Equity securities: Non-redeemable preferred stocks $ 5.4 $ (0.3 ) $ — $ — $ 5.4 $ (0.3 ) December 31, 2016 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 $ 91.0 $ (1.3 ) $ — $ — $ 91.0 $ (1.3 ) States, municipalities and political subdivisions 16.9 (0.4 ) — — 16.9 (0.4 ) Foreign governments 98.8 (0.9 ) — — 98.8 (0.9 ) Asset-backed — — 1.0 (0.1 ) 1.0 (0.1 ) Commercial mortgage-backed 33.2 (1.0 ) — — 33.2 (1.0 ) Residential mortgage-backed 347.5 (7.9 ) 2.2 (0.1 ) 349.7 (8.0 ) U.S. corporate 940.4 (13.1 ) 34.1 (2.5 ) 974.5 (15.6 ) Foreign corporate 227.3 (4.6 ) 7.6 (1.0 ) 234.9 (5.6 ) Total fixed maturity securities $ 1,755.1 $ (29.2 ) $ 44.9 $ (3.7 ) $ 1,800.0 $ (32.9 ) Equity securities: Non-redeemable preferred stocks $ 64.4 $ (1.0 ) $ 1.9 $ (0.1 ) $ 66.3 $ (1.1 )

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities	The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016. The amounts presented below for Other investments, Cash equivalents, Other assets, Assets and Liabilities held in 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, American Security Insurance Company Investment Plan, Assurant Deferred Compensation Plan, modified coinsurance arrangements and other derivatives. Other liabilities are comprised of investments in the Assurant Investment Plan, 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. September 30, 2017 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 179.0 $ — $ 179.0 $ — State, municipalities and political subdivisions 384.7 — 384.7 — Foreign governments 583.4 1.0 582.4 — Asset-backed 137.4 — 11.0 126.4 (8) Commercial mortgage-backed 39.5 — 9.7 29.8 Residential mortgage-backed 1,147.3 — 1,147.3 — U.S. corporate 5,420.4 — 5,403.9 16.5 Foreign corporate 1,840.7 — 1,806.3 34.4 Equity securities: Common stocks 14.7 14.0 0.7 — Non-redeemable preferred stocks 388.6 — 386.3 2.3 Short-term investments 266.6 137.2 (2) 129.4 — Other investments 239.5 68.8 (1) 164.2 (3) 6.5 (4) Cash equivalents 622.2 557.2 (2) 65.0 (3) — Other assets: Assets of special purpose entities 340.7 — 340.7 (3)(7) — Other derivatives 3.8 — — 3.8 (5) Assets held in separate accounts 1,763.0 1,594.9 (1) 168.1 (3) — Total financial assets $ 13,371.5 $ 2,373.1 $ 10,778.7 $ 219.7 Financial Liabilities Other liabilities $ 134.0 $ 68.8 (1) $ 8.0 (5) $ 57.2 (6) Liabilities related to separate accounts 1,763.0 1,594.9 (1) 168.1 (3) — Total financial liabilities $ 1,897.0 $ 1,663.7 $ 176.1 $ 57.2 December 31, 2016 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 174.9 $ — $ 174.9 $ — State, municipalities and political subdivisions 476.1 — 476.1 — Foreign governments 568.5 1.0 567.5 — Asset-backed 3.7 — 3.7 — Commercial mortgage-backed 38.4 — 10.6 27.8 Residential mortgage-backed 1,101.3 — 1,101.3 — U.S. corporate 5,461.2 — 5,416.7 44.5 Foreign corporate 1,748.0 — 1,714.7 33.3 Equity securities: Common stocks 20.8 20.1 0.7 — Non-redeemable preferred stocks 400.6 — 398.4 2.2 Short-term investments 227.7 52.7 (2) 175.0 — Other investments 265.1 64.9 (1) 196.7 (3) 3.5 (4) Cash equivalents 646.6 644.6 (2) 2.0 (3) — Other assets 0.6 — 0.3 (5) 0.3 (5) Assets held in separate accounts 1,650.2 1,472.9 (1) 177.3 (3) — Total financial assets $ 12,783.7 $ 2,256.2 $ 10,415.9 $ 111.6 Financial Liabilities Other liabilities $ 119.9 $ 64.9 (1) $ 0.9 (5) $ 54.1 (6) Liabilities related to separate accounts 1,650.2 1,472.9 (1) 177.3 (3) — Total financial liabilities $ 1,770.1 $ 1,537.8 $ 178.2 $ 54.1 (1) Mainly includes mutual funds. (2) Mainly includes money market funds. (3) Mainly includes fixed maturity securities. (4) Mainly includes fixed maturity securities and other derivatives. (5) Mainly includes other derivatives. (6) Mainly includes contingent consideration liabilities related to business combinations and other derivatives. (7) Refer to Note 7 - Investments for additional information regarding 2017 activity. (8) The increase in asset-backed securities classified as Level 3 consists primarily of CLOs purchased in 2017. These securities were priced using independent and non-binding broker quotes as of September 30, 2017. The inputs factoring into the broker quotes include trades in the actual bond being priced, trades of comparable bonds, quality of the issuer, optionality, structure and liquidity.
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 amount and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets: September 30, 2017 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 648.1 $ 664.1 $ — $ — $ 664.1 Policy loans 36.9 36.9 36.9 — — Other investments 40.4 40.4 — — 40.4 Total financial assets $ 725.4 $ 741.4 $ 36.9 $ — $ 704.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 644.7 $ 657.0 $ — $ — $ 657.0 Funds withheld under reinsurance 142.7 142.7 142.7 — — Liabilities of special purpose entities (2) 157.7 157.7 — 157.7 — Debt 1,067.9 1,174.0 — 1,174.0 — Total financial liabilities $ 2,013.0 $ 2,131.4 $ 142.7 $ 1,331.7 $ 657.0 December 31, 2016 Fair Value Carrying Value Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 624.0 $ 634.9 $ — $ — $ 634.9 Policy loans 38.5 38.5 38.5 — — Other investments 36.3 36.3 — — 36.3 Total financial assets $ 698.8 $ 709.7 $ 38.5 $ — $ 671.2 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 651.0 $ 680.4 $ — $ — $ 680.4 Funds withheld under reinsurance 111.7 111.7 111.7 — — Debt 1,067.0 1,159.7 — 1,159.7 — Total financial liabilities $ 1,829.7 $ 1,951.8 $ 111.7 $ 1,159.7 $ 680.4 (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. (2)

Reserves (Tables)

Reserves (Tables)	9 Months Ended
	Sep. 30, 2017
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 Nine Months Ended September 30, 2017 2016 Claims and benefits payable, at beginning of period $ 3,301.2 $ 3,896.7 Less: Reinsurance ceded and other (2,718.2 ) (1,496.5 ) Net claims and benefits payable, at beginning of period 583.0 2,400.2 Incurred losses and loss adjustment expenses related to: Current year 1,539.4 1,561.4 Prior year's interest — 9.9 Prior years (54.3 ) (176.3 ) Total incurred losses and loss adjustment expenses 1,485.1 1,395.0 Paid losses and loss adjustment expenses related to: Current year 954.5 1,151.7 Prior years 327.8 2,028.9 Total paid losses and loss adjustment expenses 1,282.3 3,180.6 Net claims and benefits payable, at end of period 785.8 614.6 Plus: Reinsurance ceded and other (1) 4,008.4 2,782.8 Claims and benefits payable, at end of period (1) $ 4,794.2 $ 3,397.4

Accumulated Other Comprehensi32

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
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): Three Months Ended September 30, 2017 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at June 30, 2017 $ (284.6 ) $ 565.6 $ 18.8 $ (62.9 ) $ 236.9 Change in accumulated other comprehensive (loss) income before reclassifications 27.6 (4.2 ) (1.0 ) — 22.4 Amounts reclassified from accumulated other comprehensive (loss) income — (3.5 ) — 0.6 (2.9 ) Net current-period other comprehensive income (loss) 27.6 (7.7 ) (1.0 ) 0.6 19.5 Balance at September 30, 2017 $ (257.0 ) $ 557.9 $ 17.8 $ (62.3 ) $ 256.4 Three Months Ended September 30, 2016 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at June 30, 2016 $ (273.4 ) $ 641.2 $ 21.3 $ (62.0 ) $ 327.1 Change in accumulated other comprehensive (loss) income before reclassifications (15.9 ) 19.6 0.3 — 4.0 Amounts reclassified from accumulated other comprehensive (loss) income — (3.3 ) — 0.2 (3.1 ) Net current-period other comprehensive (loss) income (15.9 ) 16.3 0.3 0.2 0.9 Balance at September 30, 2016 $ (289.3 ) $ 657.5 $ 21.6 $ (61.8 ) $ 328.0 Nine Months Ended September 30, 2017 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2016 $ (322.1 ) $ 459.3 $ 20.6 $ (63.2 ) $ 94.6 Change in accumulated other comprehensive (loss) income before reclassifications 65.1 112.9 (2.8 ) — 175.2 Amounts reclassified from accumulated other comprehensive (loss) income — (14.3 ) — 0.9 (13.4 ) Net current-period other comprehensive income (loss) 65.1 98.6 (2.8 ) 0.9 161.8 Balance at September 30, 2017 $ (257.0 ) $ 557.9 $ 17.8 $ (62.3 ) $ 256.4 Nine Months Ended September 30, 2016 Foreign currency translation adjustment Net unrealized gains on securities OTTI Unamortized net (losses) on Pension Plans Accumulated other comprehensive income Balance at December 31, 2015 $ (270.7 ) $ 495.4 $ 22.4 $ (128.6 ) $ 118.5 Change in accumulated other comprehensive (loss) income before reclassifications (18.6 ) 265.8 (1.1 ) 85.0 331.1 Amounts reclassified from accumulated other comprehensive (loss) income — (103.7 ) 0.3 (18.2 ) (121.6 ) Net current-period other comprehensive (loss) income (18.6 ) 162.1 (0.8 ) 66.8 209.5 Balance at September 30, 2016 $ (289.3 ) $ 657.5 $ 21.6 $ (61.8 ) $ 328.0
Reclassification out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications out of accumulated other comprehensive income for the three and nine months ended September 30, 2017 and 2016: 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 September 30, 2017 2016 Net unrealized gains on securities $ (5.3 ) $ (5.0 ) Net realized gains on investments, excluding other-than-temporary impairment losses 1.8 1.8 Provision for income taxes $ (3.5 ) $ (3.2 ) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.9 $ 0.3 (1) 0.9 0.3 Total before tax (0.3 ) (0.1 ) Provision for income taxes $ 0.6 $ 0.2 Net of tax Total reclassifications for the period $ (2.9 ) $ (3.0 ) 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 Nine Months Ended September 30, 2017 2016 Net unrealized gains on securities $ (22.0 ) $ (159.6 ) Net realized gains on investments, excluding other-than-temporary impairment losses 7.7 55.9 Provision for income taxes (14.3 ) (103.7 ) Net of tax OTTI — 0.5 Portion of net loss recognized in other comprehensive income, before taxes — (0.2 ) Provision for income taxes $ — $ 0.3 Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Settlement gain $ (0.6 ) $ — Settlement gain Amortization of net loss 2.0 1.5 (1) Gain on pension plan curtailment — (29.6 ) Gain on pension plan curtailment 1.4 (28.1 ) Total before tax (0.5 ) 9.9 Provision for income taxes 0.9 (18.2 ) Net of tax Total reclassifications for the period $ (13.4 ) $ (121.6 ) Net of tax (1)

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Based Compensation Activity	The following table shows a summary of RSU activity during the three and nine months ended September 30, 2017 and 2016: Three Months Ended Nine Months Ended 2017 2016 2017 2016 RSU compensation expense $ 6.3 $ 6.2 $ 17.1 $ 15.0 Income tax benefit (2.2 ) (2.2 ) (6.0 ) (5.3 ) RSU compensation expense, net of tax $ 4.1 $ 4.0 $ 11.1 $ 9.7 RSUs granted 31,720 41,756 236,919 351,850 Weighted average grant date fair value per unit $ 103.64 $ 88.13 $ 99.77 $ 79.45 Total fair value of vested RSUs $ 2.4 $ 3.7 $ 26.2 $ 25.0 Three Months Ended Nine Months Ended 2017 2016 2017 2016 PSU compensation expense $ 4.9 $ 9.1 $ 5.0 $ 13.3 Income tax benefit (1.7 ) (3.2 ) (1.7 ) (4.7 ) PSU compensation expense, net of tax $ 3.2 $ 5.9 $ 3.3 $ 8.6 PSUs granted 336 12,700 237,959 271,346 Weighted average grant date fair value per unit $ 112.32 $ 91.12 $ 112.32 $ 81.30 Total fair value of vested PSUs $ 0.3 $ 2.0 $ 29.7 $ 31.3

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2017
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. Three Months Ended Nine Months Ended 2017 2016 2017 2016 Numerator Net (loss) income $ (57.3 ) $ 144.4 $ 206.7 $ 534.1 Deduct dividends paid (28.8 ) (30.1 ) (88.8 ) (95.1 ) Undistributed (loss) earnings $ (86.1 ) $ 114.3 $ 117.9 $ 439.0 Denominator Weighted average shares outstanding used in basic earnings per share 54,524,874 60,262,073 55,096,933 62,522,980 Incremental common shares from: PSUs — 566,268 312,275 570,340 Employee Stock Purchase Program — — 43 — Weighted average shares used in diluted earnings per share calculations 54,524,874 60,828,341 55,409,251 63,093,320 Earnings per common share - Basic Distributed earnings $ 0.53 $ 0.50 $ 1.61 $ 1.52 Undistributed (loss) earnings (1.58 ) 1.90 2.14 7.02 Net (loss) income $ (1.05 ) $ 2.40 $ 3.75 $ 8.54 Earnings per common share - Diluted (1) Distributed earnings $ 0.53 $ 0.49 $ 1.60 $ 1.50 Undistributed (loss) earnings (1.58 ) 1.88 2.13 6.96 Net (loss) income $ (1.05 ) $ 2.37 $ 3.73 $ 8.46 (1)

Retirement and Other Employee35

Retirement and Other Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Components of Net Periodic Benefit Cost	The components of net periodic benefit (gain) cost for the Company’s qualified pension benefits plan, nonqualified pension benefits plan and retirement health benefits plan for the three and nine months ended September 30, 2017 and 2016 were as follows: Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Three Months Ended September 30, For the Three Months Ended September 30, For the Three Months Ended September 30, 2017 Plan 1 2017 Plan 2 2016 Plan 1 2016 Plan 2 2017 2016 2017 2016 Service cost $ — $ — $ 1.4 $ — $ — $ 0.2 $ — $ — Interest cost 2.5 3.2 3.3 3.5 0.7 0.9 0.9 0.9 Expected return on plan assets (5.4 ) (6.7 ) (5.5 ) (8.2 ) — — (0.8 ) (0.8 ) Amortization of net loss — 0.4 — 0.2 0.5 0.1 — — Net periodic benefit (gain) cost $ (2.9 ) $ (3.1 ) $ (0.8 ) $ (4.5 ) $ 1.2 $ 1.2 $ 0.1 $ 0.1 Qualified Pension Benefits Unfunded Nonqualified Pension Benefits Retirement Health Benefits For the Nine Months Ended September 30, For the Nine Months Ended September 30, For the Nine Months Ended September 30, 2017 Plan 1 2017 Plan 2 2016 Plan 1 2016 Plan 2 2017 2016 2017 2016 Service cost $ — $ — $ 1.4 $ — $ — $ 0.4 $ — $ — Interest cost 8.3 9.4 10.1 10.5 2.2 2.7 2.6 2.6 Expected return on plan assets (17.6 ) (20.3 ) (21.1 ) (20.0 ) — — (2.3 ) (2.3 ) Amortization of net loss — 1.0 — 0.8 1.0 0.7 — — Curtailment/settlement gain — — (23.1 ) — (0.6 ) (2.3 ) — (4.2 ) Net periodic benefit (gain) cost $ (9.3 ) $ (9.9 ) $ (32.7 ) $ (8.7 ) $ 2.6 $ 1.5 $ 0.3 $ (3.9 )

Recent Accounting Pronounceme36

Recent Accounting Pronouncements (Additional Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification into cash from financing activities	$ (169.7)	$ (735.3)
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification into cash from financing activities	$ 18.2	$ 25
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of contracts in scope for revenue recognition standard	40.00%
Adjusted in-scope revenues | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of contracts in scope for revenue recognition standard	20.00%

Segment Information (Financial

Segment Information (Financial Information by Segment) (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)		Sep. 30, 2017USD ($)reportable_segment		Sep. 30, 2016USD ($)		Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment					4
Revenues
Net earned premiums		$ 1,073.1	$ 1,215.1		$ 3,238.7		$ 3,832.6
Fees and other income		349.1	347.7		1,016.2		1,033.7
Net investment income		132.6	124.8		374.9		380.3
Net realized gains on investments		8.5	10.7		25.1		194	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	23.1	135.8		83.5		309.2
Gain on pension plan curtailment		0	0		0		29.6
Total revenues		1,586.4	1,834.1		4,738.4		5,779.4
Benefits, losses and expenses
Policyholder benefits	[3]	682.2	435.2		1,456.6		1,379.8
Amortization of deferred acquisition costs and value of business acquired		332.5	330.3		993.7		1,007.3
Underwriting, general and administrative expenses		667.1	833.7		1,964.7		2,554.6
Interest expense		12.2	14		37.2		43.7
Total benefits, losses and expenses		1,694	1,613.2		4,452.2		4,985.4
Segment income (loss) before provision (benefit) for income tax		(107.6)	220.9		286.2		794
Provision (benefit) for income taxes		(50.3)	76.5		79.5		259.9
Net (loss) income		(57.3)	144.4		206.7		534.1
Increase (decrease) in premium deficiency reserve liability					1,485.1		1,395
Total assets		32,405.2			32,405.2				$ 29,709.1
AEB
Revenues
Net earned premiums							178
Fees and other income							4.2
Net investment income							17.3
Net realized gains on investments	[1]						0
Amortization of deferred gains and gains on disposal of businesses							0
Gain on pension plan curtailment							0
Total revenues							199.5
Benefits, losses and expenses
Policyholder benefits	[3]						118.4
Amortization of deferred acquisition costs and value of business acquired							5.8
Underwriting, general and administrative expenses							58.5
Interest expense							0
Total benefits, losses and expenses							182.7
Segment income (loss) before provision (benefit) for income tax							16.8
Provision (benefit) for income taxes							6.3
Net (loss) income							10.5
AEB | Disposal group, not discontinued operations
Benefits, losses and expenses
Amortization of deferred gains	[4]	20.4	132.9		75.2		300.4
Realized gain on contingent consideration							16
Realized gains on transferred securities supporting retroactive component	[5]	0	0		0		146.7	[6]
Corporate & Other
Benefits, losses and expenses
Post-close adjustment for estimated indemnification		4.5	18		6		18
Health
Benefits, losses and expenses
Increase (decrease) in premium deficiency reserve liability		(6.9)	(21.6)		(28.8)		(20.2)
Global Housing
Revenues
Net earned premiums		423	457.4		1,301.8		1,378.3
Fees and other income		107.3	121.6		310.4		339.2
Net investment income		23.6	17		59.6		53.2
Net realized gains on investments		0	0		0		0	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	0	0		0		0
Gain on pension plan curtailment							0
Total revenues		553.9	596		1,671.8		1,770.7
Benefits, losses and expenses
Policyholder benefits	[3]	436.7	218.6		788.2		600.8
Amortization of deferred acquisition costs and value of business acquired		49.7	52.1		147.4		171.2
Underwriting, general and administrative expenses		235	260.7		723.2		734
Interest expense		0	0		0		0
Total benefits, losses and expenses		721.4	531.4		1,658.8		1,506
Segment income (loss) before provision (benefit) for income tax		(167.5)	64.6		13		264.7
Provision (benefit) for income taxes		(57.2)	20.1		5.2		86.9
Net (loss) income		(110.3)	44.5		7.8		177.8
Total assets		5,609.1			5,609.1
Global Lifestyle
Revenues
Net earned premiums		636	742		1,887.8		2,204.4
Fees and other income		205.7	185.8		594.8		572.6
Net investment income		33.1	27.4		86		80.6
Net realized gains on investments		0	0		0		0	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	0	0		0		0
Gain on pension plan curtailment							0
Total revenues		874.8	955.2		2,568.6		2,857.6
Benefits, losses and expenses
Policyholder benefits	[3]	190.6	180.1		517.3		503.2
Amortization of deferred acquisition costs and value of business acquired		266.1	263		800.7		783.5
Underwriting, general and administrative expenses		371.9	470		1,067.2		1,420.3
Interest expense		0	0		0		0
Total benefits, losses and expenses		828.6	913.1		2,385.2		2,707
Segment income (loss) before provision (benefit) for income tax		46.2	42.1		183.4		150.6
Provision (benefit) for income taxes		3.6	13.8		48.2		30.8
Net (loss) income		42.6	28.3		135.2		119.8
Total assets		9,447.8			9,447.8
Global Preneed
Revenues
Net earned premiums		14	15.2		43.8		47
Fees and other income		30.6	28		91.3		82.2
Net investment income		66.4	68		195.6		192
Net realized gains on investments		0	0		0		0	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	0	0		0		0
Gain on pension plan curtailment							0
Total revenues		111	111.2		330.7		321.2
Benefits, losses and expenses
Policyholder benefits	[3]	62.6	60.9		190.7		186.8
Amortization of deferred acquisition costs and value of business acquired		16.7	15.2		45.6		46.8
Underwriting, general and administrative expenses		13.3	14.3		42.5		41.1
Interest expense		0	0		0		0
Total benefits, losses and expenses		92.6	90.4		278.8		274.7
Segment income (loss) before provision (benefit) for income tax		18.4	20.8		51.9		46.5
Provision (benefit) for income taxes		6.1	6.4		16.9		15.1
Net (loss) income		12.3	14.4		35		31.4
Total assets		6,897.9			6,897.9
Total Corporate & Other
Revenues
Net earned premiums		0.1	0.5		5.3		24.9
Fees and other income		5.5	12.3		19.7		35.5
Net investment income		9.5	12.4		33.7		37.2
Net realized gains on investments		8.5	10.7		25.1		194	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	23.1	135.8		83.5		309.2
Gain on pension plan curtailment							29.6
Total revenues		46.7	171.7		167.3		630.4
Benefits, losses and expenses
Policyholder benefits	[3]	(7.7)	(24.4)		(39.6)		(29.4)
Amortization of deferred acquisition costs and value of business acquired		0	0		0		0
Underwriting, general and administrative expenses		46.9	88.7		131.8		300.7
Interest expense		12.2	14		37.2		43.7
Total benefits, losses and expenses		51.4	78.3		129.4		315
Segment income (loss) before provision (benefit) for income tax		(4.7)	93.4		37.9		315.4
Provision (benefit) for income taxes		(2.8)	36.2		9.2		120.8
Net (loss) income		(1.9)	57.2		28.7		194.6
Total assets		10,450.4			10,450.4
Total Corporate & Other | Corporate & Other
Revenues
Net earned premiums		0	0		0		0
Fees and other income		4.5	7.3		16.3		17.1
Net investment income		8.6	10.8		28		29.7
Net realized gains on investments		8.5	10.7		25.1		194	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	23.1	135.8		83.5		309.2
Gain on pension plan curtailment							29.6
Total revenues		44.7	164.6		152.9		579.6
Benefits, losses and expenses
Policyholder benefits	[3]	0	0		0		0
Amortization of deferred acquisition costs and value of business acquired		0	0		0		0
Underwriting, general and administrative expenses		38.2	57.2	[7]	95.7	[7]	178.5	[7]
Interest expense		12.2	14		37.2		43.7
Total benefits, losses and expenses		50.4	71.2		132.9		222.2
Segment income (loss) before provision (benefit) for income tax		(5.7)	93.4		20		357.4
Provision (benefit) for income taxes		(3.7)	34.5		2.8		128.5
Net (loss) income		(2)	58.9		17.2		228.9
Total assets		10,325.9			10,325.9
Total Corporate & Other | Health
Revenues
Net earned premiums		0.1	0.5		5.3		24.9
Fees and other income		1	5		3.4		18.4
Net investment income		0.9	1.6		5.7		7.5
Net realized gains on investments		0	0		0		0	[1]
Amortization of deferred gains and gains on disposal of businesses	[2]	0	0		0		0
Gain on pension plan curtailment							0
Total revenues		2	7.1		14.4		50.8
Benefits, losses and expenses
Policyholder benefits	[3]	(7.7)	(24.4)		(39.6)		(29.4)
Amortization of deferred acquisition costs and value of business acquired		0	0		0		0
Underwriting, general and administrative expenses		8.7	31.5		36.1		122.2
Interest expense		0	0		0		0
Total benefits, losses and expenses		1	7.1		(3.5)		92.8
Segment income (loss) before provision (benefit) for income tax		1	0		17.9		(42)
Provision (benefit) for income taxes		0.9	1.7		6.4		(7.7)
Net (loss) income		0.1	$ (1.7)		11.5		(34.3)
Total assets		$ 124.5			$ 124.5
Trade Names | Corporate & Other
Benefits, losses and expenses
Asset Impairment Charges							$ 16.7
[1]	Nine months ended September 30, 2016 includes $146.7
[2]	The nine months ended September 30, 2017 and 2016 include $75.2 and $300.4
[3]	The presentation of Assurant Health policyholder benefits includes the impact of the total current period net utilization of premium deficiency reserves for claim costs and claim adjustment expenses included in policyholder benefits, as well as maintenance costs, which are included within underwriting, general and administrative expenses. For the nine months ended September 30, 2017 and 2016, the premium deficiency reserve liability decreased $28.8 and $20.2
[4]	Amount classified as amortization of deferred gains and gains on disposal of businesses within the consolidated statements of operations. The nine months ended September 30, 2017 amount includes subsequent novations of $1.4
[5]	Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the consolidated statements of operations.
[6]	Amount classified within underwriting, general and administrative expenses in the consolidated statements of operations.
[7]	The nine months ended September 30, 2016 for Corporate and Other includes a $16.7 intangible asset impairment charge related to trade names that will no longer be used or defended by the Company, and the nine months ended September 30, 2017 and 2016, for Corporate and Other includes expense of $6.0 and $18.0

Dispositions (Narrative) (Detai

Dispositions (Narrative) (Details) - USD ($) $ in Millions		Mar. 01, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash consideration from disposal	[1]		$ 0	$ 873.9
Disposal group, not discontinued operations | Employee Benefits Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash consideration from disposal		$ 942.2
Estimated gain (loss) on disposal		656.5
Deferred gain on disposal		$ 520.4	$ 80.9
[1]	Primarily relates to the sale of Assurant's Employee Benefits segment mainly through reinsurance transactions.

Dispositions (Gain by Transacti

Dispositions (Gain by Transaction Component) (Details) - Employee Benefits Segment - Disposal group, not discontinued operations - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of entities, net of transaction costs		$ 0	$ 0	$ 0	$ 41.1
Novations, resulting in recognized gains	[1]	0	0	0	60.9
Loss on retroactive reinsurance component, before realized gains	[2]	0	0	0	(128.7)
Net loss prior to realized gains on transferred securities supporting retroactive component	[3]	0	0	0	(26.7)
Realized gains on transferred securities supporting retroactive component	[2]	0	0	0	146.7	[3]
Amortization of deferred gains	[4]	20.4	132.9	75.2	300.4
Total		$ 20.4	$ 132.9	75.2	420.4
Novations, immediate gain recognition	[1]			$ 1.4
Realized gain on contingent consideration					$ 16
[1]	Novations of certain insurance policies directly to Sun Life allowed for immediate gain recognition.
[2]	Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the consolidated statements of operations.
[3]	Amount classified within underwriting, general and administrative expenses in the consolidated statements of operations.
[4]	Amount classified as amortization of deferred gains and gains on disposal of businesses within the consolidated statements of operations. The nine months ended September 30, 2017 amount includes subsequent novations of $1.4

Acquisitions (Details)

Acquisitions (Details) - USD ($)	Feb. 01, 2017	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill acquired		$ 916,000,000	$ 830,900,000
Green Tree Insurance Agency, Inc.
Business Acquisition [Line Items]
Acquisition percentage	100.00%
Initial cash payment	$ 125,000,000
Earn-out (up to)	25,000,000
Liabilities recorded in acquisition	10,400,000
Goodwill acquired	57,900,000
Tax-deductible goodwill	0
Adjusted intangible assets		(7,900,000)
Adjusted goodwill balance		$ 7,900,000
Green Tree Insurance Agency, Inc. | Agency relationships and renewal rights
Business Acquisition [Line Items]
Amortizable intangible assets	$ 77,500,000
Green Tree Insurance Agency, Inc. | Agency relationships and renewal rights | Minimum
Business Acquisition [Line Items]
Amortizable period	7 years
Green Tree Insurance Agency, Inc. | Agency relationships and renewal rights | Maximum
Business Acquisition [Line Items]
Amortizable period	16 years

Investments (Amortized Cost, Gr

Investments (Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		$ 8,888.9	$ 8,870.8
Fixed maturity securities, fair value		9,732.4	9,572.1
Equity securities, cost or amortized cost		348.7	381.8
Equity securities, fair value		403.3	421.4
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		8,888.9	8,870.8
Fixed maturity securities, gross unrealized gains		865.4	734.2
Fixed maturity securities, gross unrealized losses		(21.9)	(32.9)
Fixed maturity securities, fair value		9,732.4	9,572.1
OTTI in AOCI	[1]	27.4	31.7
Fixed maturity securities | U.S. government and government agencies and authorities
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		176.1	172.8
Fixed maturity securities, gross unrealized gains		3.5	3.4
Fixed maturity securities, gross unrealized losses		(0.6)	(1.3)
Fixed maturity securities, fair value		179	174.9
OTTI in AOCI	[1]	0	0
Fixed maturity securities | States, municipalities and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		357.2	446.9
Fixed maturity securities, gross unrealized gains		27.6	29.6
Fixed maturity securities, gross unrealized losses		(0.1)	(0.4)
Fixed maturity securities, fair value		384.7	476.1
OTTI in AOCI	[1]	0	0
Fixed maturity securities | Foreign governments
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		525.8	508.9
Fixed maturity securities, gross unrealized gains		58.4	60.5
Fixed maturity securities, gross unrealized losses		(0.8)	(0.9)
Fixed maturity securities, fair value		583.4	568.5
OTTI in AOCI	[1]	0	0
Fixed maturity securities | Asset-backed
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		136.3	2.6
Fixed maturity securities, gross unrealized gains		1.3	1.2
Fixed maturity securities, gross unrealized losses		(0.2)	(0.1)
Fixed maturity securities, fair value		137.4	3.7
OTTI in AOCI	[1]	1	1.1
Fixed maturity securities | Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		40.1	39.3
Fixed maturity securities, gross unrealized gains		0.2	0.1
Fixed maturity securities, gross unrealized losses		(0.8)	(1)
Fixed maturity securities, fair value		39.5	38.4
OTTI in AOCI	[1]	0	0
Fixed maturity securities | Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		1,114.4	1,071.2
Fixed maturity securities, gross unrealized gains		38.9	38.1
Fixed maturity securities, gross unrealized losses		(6)	(8)
Fixed maturity securities, fair value		1,147.3	1,101.3
OTTI in AOCI	[1]	11.1	12.8
Fixed maturity securities | U.S. corporate
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		4,856.1	5,022.7
Fixed maturity securities, gross unrealized gains		569.6	454.1
Fixed maturity securities, gross unrealized losses		(5.3)	(15.6)
Fixed maturity securities, fair value		5,420.4	5,461.2
OTTI in AOCI	[1]	15.3	15.6
Fixed maturity securities | Foreign corporate
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, cost or amortized cost		1,682.9	1,606.4
Fixed maturity securities, gross unrealized gains		165.9	147.2
Fixed maturity securities, gross unrealized losses		(8.1)	(5.6)
Fixed maturity securities, fair value		1,840.7	1,748
OTTI in AOCI	[1]	0	2.2
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost or amortized cost		348.7	381.8
Equity securities, gross unrealized gains		54.9	40.7
Equity securities, gross unrealized losses		(0.3)	(1.1)
Equity securities, fair value		403.3	421.4
OTTI in AOCI	[1]	0	0
Equity securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost or amortized cost		7	11.9
Equity securities, gross unrealized gains		7.7	8.9
Equity securities, gross unrealized losses		0	0
Equity securities, fair value		14.7	20.8
OTTI in AOCI	[1]	0	0
Equity securities | Non-redeemable preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost or amortized cost		341.7	369.9
Equity securities, gross unrealized gains		47.2	31.8
Equity securities, gross unrealized losses		(0.3)	(1.1)
Equity securities, fair value		388.6	400.6
OTTI in AOCI	[1]	$ 0	$ 0
[1]	Represents the amount of OTTI recognized in accumulated other comprehensive income (“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.

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)investmentstate	Sep. 30, 2016	Dec. 31, 2016USD ($)investmentstate
Investment [Line Items]
Number of individual states exceeding overall investment portfolio exposure | state	0		0
Maximum individual state exposure	0.50%		0.50%
Advance refunded or escrowed-to-maturity securities	$ 186.7		$ 215.3
Percentage of revenue securities	49.00%		46.00%
Percentage of securities representing gross unrealized losses	2.00%		2.00%
Percentage of gross unrealized losses in a continuous loss position less than twelve months	90.00%		89.00%
Individual securities comprising total gross unrealized losses | investment	593		796
Percentage of residential mortgage-backed holdings exposure to sub-prime mortgage collateral	37.00%
Minimum
Investment [Line Items]
Outstanding balance of commercial mortgage loans (less than $1.0)	$ 0.1		$ 0.1
Maximum
Investment [Line Items]
Outstanding balance of commercial mortgage loans (less than $1.0)	12.8		12.6
Energy Sector | Foreign corporate
Investment [Line Items]
Investment in securities	676.3		641.9
Unrealized gain (loss) on investments	64.1		51.6
Europe | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Investment in securities	627.5		693.3
Unrealized gain (loss) on investments	$ 64.2		$ 54.2
Investments | Energy Sector | Foreign corporate | Internal Investment Grade
Investment [Line Items]
Percentage of investments held	87.00%		84.00%
Geographic Concentration Risk | Investments | Canada | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	78.00%		78.00%
Geographic Concentration Risk | Investments | Brazil | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	13.00%		11.00%
Geographic Concentration Risk | Investments | Germany | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	4.00%		4.00%
Geographic Concentration Risk | Investments | Other Countries (less than 3%) | Foreign Government Fixed Maturity Securities
Investment [Line Items]
Percentage of investments held	3.00%		3.00%
Geographic Concentration Risk | Investments | United Kingdom | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	4.00%		4.00%
Investment Sector Concentration Risk | Investments | Europe | Financial Services Sector | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	28.00%	23.00%
Investment Hedging Concentration Risk | Investments | Europe | Pound and Euro Denominated | Not Hedged to U.S. Dollars | Corporate Fixed Maturity and Equity Securities
Investment [Line Items]
Percentage of investments held	8.00%

Investments (Amortized Cost and

Investments (Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, cost or amortized cost	$ 243.8
Due after one year through five years, cost or amortized cost	1,709.4
Due after five years through ten years, cost or amortized cost	1,847.2
Due after ten years, cost or amortized cost	3,797.7
Total, cost or amortized cost	7,598.1
Fixed maturity securities, cost or amortized cost	8,888.9	$ 8,870.8
Due in one year or less, fair value	246.4
Due after one year through five years, fair value	1,768
Due after five years through ten years, fair value	1,933.4
Due after ten years, fair value	4,460.4
Total, fair value	8,408.2
Total fair value	9,732.4	$ 9,572.1
Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	40.1
Fair value	39.5
Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	1,114.4
Fair value	1,147.3
Asset-backed
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	136.3
Fair value	$ 137.4

Investments (Net Realized Gains

Investments (Net Realized Gains (Losses), Including Other-Than-Temporary Impairments) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) related to sales and other:		$ 8.9	[1]	$ 10.7	$ 26	[1]	$ 194.7	[1]
Net realized losses related to other-than-temporary impairments:		(0.4)		0	(0.9)		(0.7)
Total net realized gains		8.5		10.7	25.1		194
Disposal group, not discontinued operations | Employee Benefits Segment
Gain (Loss) on Investments [Line Items]
Investments transferred	[2]	0		0	0		146.7	[3]
Fixed maturity securities
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) related to sales and other:		2.3		8.7	16.8		154.5
Net realized losses related to other-than-temporary impairments:		0		0	(0.4)		(0.7)
Equity securities
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) related to sales and other:		3		(0.2)	6.8		12.9
Commercial Mortgage Loans On Real Estate
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) related to sales and other:		0		0.1	0		21.6
Other investments
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) related to sales and other:		3.6		2.1	2.4		5.7
Net realized losses related to other-than-temporary impairments:		$ (0.4)		$ 0	$ (0.5)		$ 0
[1]	Nine months ended September 30, 2016 net gains includes $146.7
[2]	Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the consolidated statements of operations.
[3]	Amount classified within underwriting, general and administrative expenses in the consolidated statements of operations.

Investments (Investment Categor

Investments (Investment Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fixed maturity securities
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	$ 1,308.6	$ 1,755.1
Gross unrealized losses on securities, less than 12 months, unrealized losses	(19.7)	(29.2)
Gross unrealized losses on securities, 12 months or more, fair value	85.6	44.9
Gross unrealized losses on securities, 12 months or more, unrealized losses	(2.2)	(3.7)
Gross unrealized losses on securities, fair value, total	1,394.2	1,800
Gross unrealized losses on securities, unrealized losses, total	(21.9)	(32.9)
Fixed maturity securities | U.S. government and government agencies and authorities
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	99.6	91
Gross unrealized losses on securities, less than 12 months, unrealized losses	(0.5)	(1.3)
Gross unrealized losses on securities, 12 months or more, fair value	4.7	0
Gross unrealized losses on securities, 12 months or more, unrealized losses	(0.1)	0
Gross unrealized losses on securities, fair value, total	104.3	91
Gross unrealized losses on securities, unrealized losses, total	(0.6)	(1.3)
Fixed maturity securities | States, municipalities and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	0	16.9
Gross unrealized losses on securities, less than 12 months, unrealized losses	0	(0.4)
Gross unrealized losses on securities, 12 months or more, fair value	2.4	0
Gross unrealized losses on securities, 12 months or more, unrealized losses	(0.1)	0
Gross unrealized losses on securities, fair value, total	2.4	16.9
Gross unrealized losses on securities, unrealized losses, total	(0.1)	(0.4)
Fixed maturity securities | Foreign governments
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	49	98.8
Gross unrealized losses on securities, less than 12 months, unrealized losses	(0.8)	(0.9)
Gross unrealized losses on securities, 12 months or more, fair value	0	0
Gross unrealized losses on securities, 12 months or more, unrealized losses	0	0
Gross unrealized losses on securities, fair value, total	49	98.8
Gross unrealized losses on securities, unrealized losses, total	(0.8)	(0.9)
Fixed maturity securities | Asset-backed
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	26.3	0
Gross unrealized losses on securities, less than 12 months, unrealized losses	(0.2)	0
Gross unrealized losses on securities, 12 months or more, fair value	0	1
Gross unrealized losses on securities, 12 months or more, unrealized losses	0	(0.1)
Gross unrealized losses on securities, fair value, total	26.3	1
Gross unrealized losses on securities, unrealized losses, total	(0.2)	(0.1)
Fixed maturity securities | Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	17.5	33.2
Gross unrealized losses on securities, less than 12 months, unrealized losses	(0.7)	(1)
Gross unrealized losses on securities, 12 months or more, fair value	12.3	0
Gross unrealized losses on securities, 12 months or more, unrealized losses	(0.1)	0
Gross unrealized losses on securities, fair value, total	29.8	33.2
Gross unrealized losses on securities, unrealized losses, total	(0.8)	(1)
Fixed maturity securities | Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	282.7	347.5
Gross unrealized losses on securities, less than 12 months, unrealized losses	(5)	(7.9)
Gross unrealized losses on securities, 12 months or more, fair value	31.6	2.2
Gross unrealized losses on securities, 12 months or more, unrealized losses	(1)	(0.1)
Gross unrealized losses on securities, fair value, total	314.3	349.7
Gross unrealized losses on securities, unrealized losses, total	(6)	(8)
Fixed maturity securities | U.S. corporate
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	445.7	940.4
Gross unrealized losses on securities, less than 12 months, unrealized losses	(4.7)	(13.1)
Gross unrealized losses on securities, 12 months or more, fair value	26.9	34.1
Gross unrealized losses on securities, 12 months or more, unrealized losses	(0.6)	(2.5)
Gross unrealized losses on securities, fair value, total	472.6	974.5
Gross unrealized losses on securities, unrealized losses, total	(5.3)	(15.6)
Fixed maturity securities | Foreign corporate
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	387.8	227.3
Gross unrealized losses on securities, less than 12 months, unrealized losses	(7.8)	(4.6)
Gross unrealized losses on securities, 12 months or more, fair value	7.7	7.6
Gross unrealized losses on securities, 12 months or more, unrealized losses	(0.3)	(1)
Gross unrealized losses on securities, fair value, total	395.5	234.9
Gross unrealized losses on securities, unrealized losses, total	(8.1)	(5.6)
Equity securities | Non-redeemable preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities, less than 12 months, fair value	5.4	64.4
Gross unrealized losses on securities, less than 12 months, unrealized losses	(0.3)	(1)
Gross unrealized losses on securities, 12 months or more, fair value	0	1.9
Gross unrealized losses on securities, 12 months or more, unrealized losses	0	(0.1)
Gross unrealized losses on securities, fair value, total	5.4	66.3
Gross unrealized losses on securities, unrealized losses, total	$ (0.3)	$ (1.1)

Investments (Variable Interest

Investments (Variable Interest Entities) (Details) $ in Millions	1 Months Ended
	Jan. 31, 2017USD ($)Entity	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Variable Interest Entity [Line Items]
Number of special purpose entities | Entity	2
Other assets		$ 349.7	$ 0
Accounts payable and other liabilities		279.7	$ 0
Variable Interest Entity, Classification
Variable Interest Entity [Line Items]
Payments to acquire business	$ 70
Accounts receivable
Variable Interest Entity [Line Items]
Other assets		9
Investments
Variable Interest Entity [Line Items]
Other assets		340.7
Debt
Variable Interest Entity [Line Items]
Accounts payable and other liabilities		157.7
Obligations
Variable Interest Entity [Line Items]
Accounts payable and other liabilities		$ 122

Fair Value Disclosures (Fair Va

Fair Value Disclosures (Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		$ 13,371.5		$ 12,783.7
Total financial liabilities		1,897		1,770.1
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		2,373.1		2,256.2
Total financial liabilities		1,663.7		1,537.8
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		10,778.7		10,415.9
Total financial liabilities		176.1		178.2
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		219.7		111.6
Total financial liabilities		57.2		54.1
Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities		134		119.9
Other liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	[1]	68.8		64.9
Other liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	[2]	8		0.9
Other liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	[3]	57.2		54.1
Liabilities related to separate accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities		1,763		1,650.2
Liabilities related to separate accounts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	[1]	1,594.9		1,472.9
Liabilities related to separate accounts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	[4]	168.1		177.3
Liabilities related to separate accounts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities		0		0
U.S. government and government agencies and authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		179		174.9
U.S. government and government agencies and authorities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
U.S. government and government agencies and authorities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		179		174.9
U.S. government and government agencies and authorities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		384.7		476.1
States, municipalities and political subdivisions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
States, municipalities and political subdivisions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		384.7		476.1
States, municipalities and political subdivisions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Foreign governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		583.4		568.5
Foreign governments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1		1
Foreign governments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		582.4		567.5
Foreign governments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		137.4		3.7
Asset-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Asset-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		11		3.7
Asset-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		126.4	[5]	0
Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		39.5		38.4
Commercial mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Commercial mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		9.7		10.6
Commercial mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		29.8		27.8
Residential mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1,147.3		1,101.3
Residential mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Residential mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1,147.3		1,101.3
Residential mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		5,420.4		5,461.2
U.S. corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
U.S. corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		5,403.9		5,416.7
U.S. corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		16.5		44.5
Foreign corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1,840.7		1,748
Foreign corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Foreign corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1,806.3		1,714.7
Foreign corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		34.4		33.3
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		14.7		20.8
Common Stock | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		14		20.1
Common Stock | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0.7		0.7
Common Stock | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		388.6		400.6
Non-redeemable preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Non-redeemable preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		386.3		398.4
Non-redeemable preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		2.3		2.2
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		266.6		227.7
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[6]	137.2		52.7
Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		129.4		175
Short-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		239.5		265.1
Other investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[1]	68.8		64.9
Other investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[4]	164.2		196.7
Other investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[7]	6.5		3.5
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		622.2		646.6
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[6]	557.2		644.6
Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[4]	65		2
Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0		0
Assets of special purpose entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		340.7
Assets of special purpose entities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0
Assets of special purpose entities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[4],[8]	340.7
Assets of special purpose entities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0
Other derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		3.8
Other derivatives | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0
Other derivatives | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		0
Other derivatives | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[2]	3.8
Other assets:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets				0.6
Other assets: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets				0
Other assets: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[2]			0.3
Other assets: | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[2]			0.3
Assets held in separate accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		1,763		1,650.2
Assets held in separate accounts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[1]	1,594.9		1,472.9
Assets held in separate accounts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	[4]	168.1		177.3
Assets held in separate accounts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		$ 0		$ 0
[1]	Mainly includes mutual funds.
[2]	Mainly includes other derivatives.
[3]	Mainly includes contingent consideration liabilities related to business combinations and other derivatives.
[4]	Mainly includes fixed maturity securities.
[5]	The increase in asset-backed securities classified as Level 3 consists primarily of CLOs purchased in 2017.  These securities were priced using independent and non-binding broker quotes as of September 30, 2017. The inputs factoring into the broker quotes include trades in the actual bond being priced, trades of comparable bonds, quality of the issuer, optionality, structure and liquidity.
[6]	Mainly includes money market funds.
[7]	Mainly includes fixed maturity securities and other derivatives.
[8]	Refer to Note 7 - Investments for additional information regarding 2017 activity.

Fair Value Disclosures (Narrati

Fair Value Disclosures (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Allowance for doubtful accounts reinsurance recoverable	$ 5.3	$ 0.3

Fair Value Disclosures (Carryin

Fair Value Disclosures (Carrying Value and Fair Value of the Financial Instruments that are Not recognized or are Not Carried at Fair Value) (Details) - Nonrecurring - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate		$ 648.1	$ 624
Policy loans		36.9	38.5
Other investments		40.4	36.3
Total financial assets		725.4	698.8
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	[1]	644.7	651
Funds withheld under reinsurance		142.7	111.7
Liabilities Of Special Purpose Entities, Fair Value Disclosure	[2]	157.7
Debt		1,067.9	1,067
Total financial liabilities		2,013	1,829.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate		664.1	634.9
Policy loans		36.9	38.5
Other investments		40.4	36.3
Total financial assets		741.4	709.7
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	[1]	657	680.4
Funds withheld under reinsurance		142.7	111.7
Liabilities Of Special Purpose Entities, Fair Value Disclosure	[2]	157.7
Debt		1,174	1,159.7
Total financial liabilities		2,131.4	1,951.8
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate		0	0
Policy loans		36.9	38.5
Other investments		0	0
Total financial assets		36.9	38.5
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	[1]	0	0
Funds withheld under reinsurance		142.7	111.7
Liabilities Of Special Purpose Entities, Fair Value Disclosure	[2]	0
Debt		0	0
Total financial liabilities		142.7	111.7
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate		0	0
Policy loans		0	0
Other investments		0	0
Total financial assets		0	0
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	[1]	0	0
Funds withheld under reinsurance		0	0
Liabilities Of Special Purpose Entities, Fair Value Disclosure	[2]	157.7
Debt		1,174	1,159.7
Total financial liabilities		1,331.7	1,159.7
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate		664.1	634.9
Policy loans		0	0
Other investments		40.4	36.3
Total financial assets		704.5	671.2
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	[1]	657	680.4
Funds withheld under reinsurance		0	0
Liabilities Of Special Purpose Entities, Fair Value Disclosure	[2]	0
Debt		0	0
Total financial liabilities		$ 657	$ 680.4
[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.
[2]	Included as a component of Accounts payable and other liabilities on the consolidated balance sheet. Refer to Note 7 - Investments for additional information regarding 2017 amounts and activity.

Reserves (Roll Forward of Claim

Reserves (Roll Forward of Claims and Benefits Payable) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)		Sep. 30, 2016USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Claims and benefits payable, at beginning of period	$ 3,301.2		$ 3,896.7
Less: Reinsurance ceded and other	2,718.2		1,496.5
Net claims and benefits payable, at beginning of period	583		2,400.2
Incurred losses and loss adjustment expenses related to:
Current year	1,539.4		1,561.4
Prior year's interest	0		9.9
Prior years	(54.3)		(176.3)
Total incurred losses and loss adjustment expenses	1,485.1		1,395
Paid losses and loss adjustment expenses related to:
Current year	954.5		1,151.7
Prior years	327.8		2,028.9
Total paid losses and loss adjustment expenses	1,282.3		3,180.6
Net claims and benefits payable, at end of period	785.8		614.6
Plus: Reinsurance ceded and other	4,008.4	[1]	2,782.8
Claims and benefits payable, at end of period (1)	4,794.2	[1]	$ 3,397.4
Recoverables, claims, and benefits payable ceded to U.S. Government	$ 1,123	[1]
[1]	Global Housing's reinsurance recoverables and claims and benefits payable as of September 30, 2017 include $1,123.0

Reserves (Narrative) (Details)

Reserves (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Global Housing and Global Lifestyle
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable development	$ 45.6	$ 75.1
Global Housing | Hurricane Matthew
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable development	5.2
AEB
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable development		42.5
Assurant Health
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable development	$ 8.2	$ 58.2

Accumulated Other Comprehensi52

Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 4,098.1
Change in accumulated other comprehensive (loss) income before reclassifications	$ 22.4	$ 4	175.2	$ 331.1
Amounts reclassified from accumulated other comprehensive (loss) income	(2.9)	(3.1)	(13.4)	(121.6)
Total other comprehensive income	19.5	0.9	161.8	209.5
Ending balance	4,138.2		4,138.2
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	236.9	327.1	94.6	118.5
Total other comprehensive income			161.8
Ending balance	256.4	328	256.4	328
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(284.6)	(273.4)	(322.1)	(270.7)
Change in accumulated other comprehensive (loss) income before reclassifications	27.6	(15.9)	65.1	(18.6)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Total other comprehensive income	27.6	(15.9)	65.1	(18.6)
Ending balance	(257)	(289.3)	(257)	(289.3)
Net unrealized gains on securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	565.6	641.2	459.3	495.4
Change in accumulated other comprehensive (loss) income before reclassifications	(4.2)	19.6	112.9	265.8
Amounts reclassified from accumulated other comprehensive (loss) income	(3.5)	(3.3)	(14.3)	(103.7)
Total other comprehensive income	(7.7)	16.3	98.6	162.1
Ending balance	557.9	657.5	557.9	657.5
OTTI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	18.8	21.3	20.6	22.4
Change in accumulated other comprehensive (loss) income before reclassifications	(1)	0.3	(2.8)	(1.1)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0.3
Total other comprehensive income	(1)	0.3	(2.8)	(0.8)
Ending balance	17.8	21.6	17.8	21.6
Unamortized net (losses) on Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(62.9)	(62)	(63.2)	(128.6)
Change in accumulated other comprehensive (loss) income before reclassifications	0	0	0	85
Amounts reclassified from accumulated other comprehensive (loss) income	0.6	0.2	0.9	(18.2)
Total other comprehensive income	0.6	0.2	0.9	66.8
Ending balance	$ (62.3)	$ (61.8)	$ (62.3)	$ (61.8)

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on investments, excluding other-than-temporary impairment losses		$ 8.9	[1]	$ 10.7	$ 26	[1]	$ 194.7	[1]
Provision for income taxes		50.3		(76.5)	(79.5)		(259.9)
Net (loss) income		(57.3)		144.4	206.7		534.1
Portion of net loss recognized in other comprehensive income, before taxes		0		0	0		0.3
Total reclassifications for the period, net of tax		(2.9)		(3.1)	(13.4)		(121.6)
Net unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		(3.5)		(3.3)	(14.3)		(103.7)
OTTI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		0		0	0		0.3
Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		0.6		0.2	0.9		(18.2)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		(2.9)		(3)	(13.4)		(121.6)
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 on investments, excluding other-than-temporary impairment losses		(5.3)		(5)	(22)		(159.6)
Provision for income taxes		1.8		1.8	7.7		55.9
Net (loss) income		(3.5)		(3.2)	(14.3)		(103.7)
Reclassification out of Accumulated Other Comprehensive Income | OTTI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes					0		(0.2)
Net (loss) income					0		0.3
Portion of net loss recognized in other comprehensive income, before taxes					0		0.5
Reclassification out of Accumulated Other Comprehensive Income | Settlement gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax					(0.6)		0
Reclassification out of Accumulated Other Comprehensive Income | Gain on pension plan curtailment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax					0		(29.6)
Reclassification out of Accumulated Other Comprehensive Income | Unamortized net (losses) on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		0.9		0.3	1.4		(28.1)
Provision for income taxes		(0.3)		(0.1)	(0.5)		9.9
Total reclassifications for the period, net of tax		0.6		0.2	0.9		(18.2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	[2]	$ 0.9		$ 0.3	$ 2		$ 1.5
[1]	Nine months ended September 30, 2016 net gains includes $146.7
[2]	These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 14 - Retirement and Other Employee Benefits for additional information.

Stock Based Compensation (Long-

Stock Based Compensation (Long-Term Equity Incentive Plans) (Details)	May 12, 2017shares
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)	6,800,000

Stock Based Compensation (Restr

Stock Based Compensation (Restricted Stock Units) (Details) - Long-Term Equity Incentive Plan - Restricted Stock Units - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6.3	$ 6.2	$ 17.1	$ 15
Income tax benefit	(2.2)	(2.2)	(6)	(5.3)
Compensation expense, net of tax	$ 4.1	$ 4	$ 11.1	$ 9.7
Number of awards granted (in shares)	31,720	41,756	236,919	351,850
Weighted average grant date fair value (in dollars per share)	$ 103.64	$ 88.13	$ 99.77	$ 79.45
Fair value of awards vested	$ 2.4	$ 3.7	$ 26.2	$ 25
Unrecognized compensation cost	$ 20.9		$ 20.9
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)			1 year 3 months 18 days

Stock Based Compensation (Perfo

Stock Based Compensation (Performance Share Units) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net incremental (expense) benefit	$ (0.1)		$ 0.7
Long-Term Equity Incentive Plan | Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	4.9	$ 9.1	5	$ 13.3
Income tax benefit	(1.7)	(3.2)	(1.7)	(4.7)
Compensation expense, net of tax	$ 3.2	$ 5.9	$ 3.3	$ 8.6
Number of awards granted (in shares)	336	12,700	237,959	271,346
Weighted average grant date fair value (in dollars per share)	$ 112.32	$ 91.12	$ 112.32	$ 81.30
Fair value of awards vested	$ 0.3	$ 2	$ 29.7	$ 31.3
Unrecognized compensation cost	$ 23.7		$ 23.7
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years)			1 year

Stock Repurchase (Narrative) (D

Stock Repurchase (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)shares
Class of Stock Disclosures [Abstract]
Number of shares repurchased (in shares) | shares	2,535,457
Shares repurchased, value	$ 250.5
Value remaining under total repurchase authorization	$ 432.4

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		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net (loss) income		$ (57.3)	$ 144.4	$ 206.7	$ 534.1
Deduct dividends paid		(28.8)	(30.1)	(88.8)	(95.1)
Undistributed (loss) earnings		$ (86.1)	$ 114.3	$ 117.9	$ 439
Denominator
Weighted average shares outstanding used in basic earnings per share (in shares)		54,524,874	60,262,073	55,096,933	62,522,980
Incremental common shares from:
Weighted average shares used in diluted earnings per share calculations (in shares)		54,524,874	60,828,341	55,409,251	63,093,320
Earnings per common share - Basic
Distributed earnings, basic (in dollars per share)		$ 0.53	$ 0.50	$ 1.61	$ 1.52
Undistributed earnings, basic (in dollars per share)		(1.58)	1.90	2.14	7.02
Net income - basic (in dollars per share)		(1.05)	2.40	3.75	8.54
Earnings per common share - Diluted
Distributed earnings, diluted (in dollars per share)	[1]	0.53	0.49	1.60	1.50
Undistributed earning - diluted (in dollars per share)	[1]	(1.58)	1.88	2.13	6.96
Net income - diluted (in dollars per share)	[1]	$ (1.05)	$ 2.37	$ 3.73	$ 8.46
PSUs
Incremental common shares from:
Incremental common shares (in shares)		0	566,268	312,275	570,340
Employee Stock Purchase Program
Incremental common shares from:
Incremental common shares (in shares)		0	0	43	0
[1]	In accordance with earnings per share guidance, diluted per share amounts are computed in the same manner as basic per share amounts when a loss from operations exists.

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from computation of diluted EPS (in shares)	5,301	68,439	6,449

Retirement and Other Employee60

Retirement and Other Employee Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Qualified Pension Plan - Plan 1
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1.4	$ 0	$ 1.4
Interest cost	2.5	3.3	8.3	10.1
Expected return on plan assets	(5.4)	(5.5)	(17.6)	(21.1)
Amortization of net loss	0	0	0	0
Curtailment/settlement gain			0	(23.1)
Net periodic benefit (gain) cost	(2.9)	(0.8)	(9.3)	(32.7)
Qualified Pension Plan - Plan 2
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	3.2	3.5	9.4	10.5
Expected return on plan assets	(6.7)	(8.2)	(20.3)	(20)
Amortization of net loss	0.4	0.2	1	0.8
Curtailment/settlement gain			0	0
Net periodic benefit (gain) cost	(3.1)	(4.5)	(9.9)	(8.7)
Unfunded Nonqualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0.2	0	0.4
Interest cost	0.7	0.9	2.2	2.7
Expected return on plan assets	0	0	0	0
Amortization of net loss	0.5	0.1	1	0.7
Curtailment/settlement gain			(0.6)	(2.3)
Net periodic benefit (gain) cost	1.2	1.2	2.6	1.5
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0.9	0.9	2.6	2.6
Expected return on plan assets	(0.8)	(0.8)	(2.3)	(2.3)
Amortization of net loss	0	0	0	0
Curtailment/settlement gain			0	(4.2)
Net periodic benefit (gain) cost	$ 0.1	$ 0.1	$ 0.3	$ (3.9)

Retirement and Other Employee61

Retirement and Other Employee Benefits (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Qualified pension benefits plan under-funded amount	$ 83,100,000	$ 77,000,000
Funded status percentage	112.00%	111.00%
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	1 Months Ended	9 Months Ended
	Apr. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding		$ 18.4	$ 17.2
Payments for examination, compliance, and monitoring costs	$ 85
Lender-placed re-file period		4 years
Accrual of estimated share of guaranty association assessments		$ 11	$ 12.5
Payments To State Guaranty Funds		2.3
Expense related to Penn Treaty		$ 0.8

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - Global Lifestyle - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net tax benefits	$ 9.6
Reduction in valuation allowance of subsidiary	3.4
Tax benefit related to international restructuring	$ 6.2	$ 18

Subsequent Event (Narrative) (D

Subsequent Event (Narrative) (Details) - USD ($)	Oct. 17, 2017	Sep. 30, 2017	Nov. 03, 2017
Subsequent Event [Line Items]
Threshold for losses categorized as catastrophic		$ 5,000,000
Subsequent Event | TWG Holdings
Subsequent Event [Line Items]
Consideration transferred	$ 372,400,000
Shares retained in aggregate	16,000,000
Shares issued in merger	16,000,000
Value of shares issued in merger	$ 1,500,000,000
Equity value assigned to TWG	1,900,000,000
Enterprise value assigned to TWG	2,500,000,000
Debt incurred	$ 591,300,000
Expected Business Acquisition, Percentage of Voting Interests Acquired	77.00%
Subsequent Event | TWG Holdings | TWG Holdings
Subsequent Event [Line Items]
Expected Business Acquisition, Percentage of Voting Interests Acquired	23.00%
Subsequent Event | Line of Credit | Unsecured bridge loan facility | Morgan Stanley
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Subsequent Event | Line of Credit | Unsecured debt | Morgan Stanley
Subsequent Event [Line Items]
Maximum borrowing capacity	350,000,000
Line of Credit Facility, Commitment Fee Amount	$ 70,000,000
California | Subsequent Event | Wildfires | Minimum
Subsequent Event [Line Items]
Pre-tax loss estimation			$ 6,000,000
California | Subsequent Event | Wildfires | Maximum
Subsequent Event [Line Items]
Pre-tax loss estimation			$ 8,000,000