Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax [Line Items]
Decrease in effective tax rate due to an international reorganization (basis points)			6.86%
One-time tax benefit from conversion of certain U.S. companies with branch operations in Canada to foreign corporate entities		$ 20,753
Provision (benefit) for income taxes	$ 7,236	$ 50,177	$ 40,385	$ 148,185
Increase in effective tax rate (basis points)				1.34%
Solutions
Income Tax [Line Items]
Net tax benefit due to international reorganization			$ 8,448
Assurant Health | Compensation Expenses
Income Tax [Line Items]
Provision (benefit) for income taxes				$ 5,749