Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost – $10,834.0 and $8,756.5 at December 31, 2018 and 2017, respectively)		$ 11,257.1	$ 9,662.6
Equity securities, at fair value (cost – $361.6 in 2018)		378.8
Equity securities, at fair value (cost – $316.3 in 2017)			368.0
Commercial mortgage loans on real estate, at amortized cost		759.6	670.2
Short-term investments		373.2	284.1
Other investments		635.2	568.6
Total investments		13,403.9	11,553.5
Cash and cash equivalents		1,254.0	996.8
Premiums and accounts receivable, net		1,643.5	1,237.3
Reinsurance recoverables		9,166.0	9,790.2
Accrued investment income		125.5	105.4
Deferred acquisition costs		5,103.0	3,484.5
Property and equipment, at cost less accumulated depreciation		392.5	347.6
Tax receivable		36.3	126.3
Goodwill		2,321.8	917.7
Value of business acquired		3,157.8	24.4
Other intangible assets, net		622.4	288.6
Other assets		567.5	387.1
Assets held in separate accounts		1,609.7	1,837.1
Assets of consolidated investment entities	[1]	1,685.4	746.5
Total assets		41,089.3	31,843.0
Liabilities
Future policy benefits and expenses		9,240.9	10,397.4
Unearned premiums		15,648.0	7,038.6
Claims and benefits payable		2,813.7	3,782.2
Commissions payable		338.6	365.1
Reinsurance balances payable		330.9	145.3
Funds held under reinsurance		272.0	179.8
Deferred gains on disposal of businesses		53.1	128.1
Accounts payable and other liabilities		2,187.4	2,046.3
Debt		2,006.0	1,068.2
Liabilities related to separate accounts		1,609.7	1,837.1
Liabilities of consolidated investment entities	[1]	1,455.1	573.4
Total liabilities		35,955.4	27,561.5
Commitments and contingencies (Note 26)
Stockholders’ equity
6.50% Series D mandatory convertible preferred stock, par value $1.00 per share, 2,875,000 shares authorized, 2,875,000 issued and outstanding at December 31, 2018		2.9	0.0
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 161,153,454 and 150,392,604 shares issued and 61,908,979 and 52,417,812 shares outstanding at December 31, 2018 and 2017, respectively		1.6	1.5
Additional paid-in capital		4,495.6	3,197.9
Retained earnings		5,759.7	5,697.3
Accumulated other comprehensive income		(155.4)	234.0
Treasury stock, at cost; 99,244,475 and 97,974,792 shares at December 31, 2018 and 2017, respectively		(4,992.4)	(4,860.1)
Total Assurant, Inc. stockholders’ equity		5,112.0	4,270.6
Non-controlling interest		21.9	10.9
Total equity		5,133.9	4,281.5
Total liabilities and equity		$ 41,089.3	$ 31,843.0

[1] The following table presents information on assets and liabilities related to consolidated investment entities as of December 31, 2018 and 2017.   December 31,   2018   2017   (in millions) Assets       Cash and cash equivalents $ 62.6
  $ 69.8
Investments, at fair value 1,576.2
  655.0
Other receivables 46.6
  21.7
Total assets $ 1,685.4
  $ 746.5
Liabilities       Collateralized loan obligation notes, at fair value $ 1,316.7
  $ 450.7
Other liabilities 138.4
  122.7
Total liabilities $ 1,455.1
  $ 573.4