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Reserves - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2007
Dec. 31, 2015
Claims and Benefits Payable        
Favorable development $ 0.1      
Assurant Health and AEB        
Claims and Benefits Payable        
Favorable development   $ 39.9   $ 35.0
Universal Life and Annuity        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 4.50%      
Universal Life and Annuity | Minimum        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 3.50%      
Universal Life and Annuity | Maximum        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 4.00%      
Universal Life        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 0.00%      
Universal Life | Minimum        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 4.00%      
Universal Life | Maximum        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 4.10%      
Surrender charge grading period 20 years      
Global Preneed | Preneed life insurance        
Claims and Benefits Payable        
Future policy benefit increases tied to inflation (as a percent) 3.00% 3.00% 2.30%  
Global Preneed | Preneed life insurance | Minimum        
Claims and Benefits Payable        
Interest rate assumption 4.70% 4.70%    
Percentage of adverse deviation in interest and discount rate for preneed life insurance 0.20% 0.20%    
Future policy benefit increases 1.00% 1.00%    
Global Preneed | Preneed life insurance | Maximum        
Claims and Benefits Payable        
Interest rate assumption 7.30% 7.30%    
Percentage of adverse deviation in interest and discount rate for preneed life insurance 0.50% 0.50%    
Future policy benefit increases 7.00% 7.00%    
Global Preneed | Life insurance no longer offered        
Claims and Benefits Payable        
Period of grading of interest and discount rates   20 years    
Global Preneed | Life insurance no longer offered | Minimum        
Claims and Benefits Payable        
Discount rate 5.30% 5.30%    
Period of grading of interest and discount rates 20 years      
Global Preneed | Life insurance no longer offered | Maximum        
Claims and Benefits Payable        
Discount rate 7.50% 7.50%    
Global Preneed | Block of pre-1980 traditional life insurance business        
Claims and Benefits Payable        
Discount rate 8.80% 8.80%    
Global Preneed | Preneed annuities        
Claims and Benefits Payable        
Withdrawal charge percentage 0.00%      
Global Preneed | Preneed annuities | Minimum        
Claims and Benefits Payable        
Surrender charge grading period   0 years    
Interest rate assumption 1.00% 1.00%    
Withdrawal charge percentage 0.00% 0.00%    
Global Preneed | Preneed annuities | Maximum        
Claims and Benefits Payable        
Surrender charge grading period 7 years 7 years    
Interest rate assumption 5.50% 5.50%    
Withdrawal charge percentage 7.00% 7.00%