Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost - $10,777.0 in 2018 and $8,756.5 in 2017)		$ 11,297.5	$ 9,662.6
Equity securities, at fair value (cost - $349.6 in 2018 and $316.3 in 2017)		385.8
Equity securities, at fair value (cost - $349.6 in 2018 and $316.3 in 2017)			368.0
Commercial mortgage loans on real estate, at amortized cost		720.1	670.2
Short-term investments		343.6	284.1
Other investments		642.2	568.6
Total investments		13,389.2	11,553.5
Cash and cash equivalents		1,253.7	996.8
Premiums and accounts receivable, net		1,512.7	1,237.3
Reinsurance recoverables		10,978.3	9,790.2
Accrued investment income		136.1	105.4
Deferred acquisition costs		3,882.7	3,484.5
Property and equipment, at cost less accumulated depreciation		370.6	347.6
Tax receivable		54.3	126.3
Goodwill		2,369.2	917.7
Value of business acquired		3,962.5	24.4
Other intangible assets, net		664.8	288.6
Other assets		623.7	387.1
Assets held in separate accounts		1,858.3	1,837.1
Assets of consolidated investment entities	[1]	1,305.2	746.5
Total assets		42,361.3	31,843.0
Liabilities
Future policy benefits and expenses		10,386.0	10,397.4
Unearned premiums		14,505.0	7,038.6
Claims and benefits payable		3,503.1	3,782.2
Commissions payable		308.1	365.1
Reinsurance balances payable		324.1	145.3
Funds held under reinsurance		347.1	179.8
Deferred gains on disposal of businesses		94.7	128.1
Accounts payable and other liabilities		2,610.7	2,046.3
Debt		2,004.8	1,068.2
Liabilities related to separate accounts		1,858.3	1,837.1
Liabilities of consolidated investment entities	[1]	1,086.5	573.4
Total liabilities		37,028.4	27,561.5
Commitments and contingencies (Note 18)
Stockholders’ equity
6.50% Series D mandatory convertible preferred stock, $1.00 par value, 2,875,000 shares authorized, 2,875,000 issued and outstanding at June 30, 2018		2.9	0.0
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 161,069,104 and 150,392,604 shares issued and 63,094,312 and 52,417,812 shares outstanding at June 30, 2018 and December 31, 2017, respectively		1.6	1.5
Additional paid-in capital		4,459.7	3,197.9
Retained earnings		5,846.3	5,697.3
Accumulated other comprehensive (loss) income		(137.9)	234.0
Treasury stock, at cost; 97,974,792 shares at June 30, 2018 and December 31, 2017		(4,860.1)	(4,860.1)
Total Assurant, Inc. stockholders’ equity		5,312.5	4,270.6
Non-controlling interest		20.4	10.9
Total equity		5,332.9	4,281.5
Total liabilities and equity		$ 42,361.3	$ 31,843.0

[1] The following table presents information on assets and liabilities related to consolidated investment entities as of June 30, 2018 and December 31, 2017