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Reserves (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Life and Annuity Insurance Product Line      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Guaranteed crediting rate on annuities 4.50%    
Minimum | Life and Annuity Insurance Product Line      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Guaranteed crediting rate on annuities 3.50%    
Minimum | Universal Life      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Surrender charge, period 0 years    
Crediting interest rates on universal life funds 4.00%    
Maximum | Life and Annuity Insurance Product Line      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Guaranteed crediting rate on annuities 4.00%    
Maximum | Universal Life      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Surrender charge, period 20 years    
Crediting interest rates on universal life funds 4.10%    
Assurant Health and AEB      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Favorable (unfavorable) loss development $ 110,924 $ 75,004 $ 108,566
Global Preneed | Minimum      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Discount rates 1.50% 1.50%  
Global Preneed | Minimum | Life insurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Discount rates 0.10% 0.10%  
Global Preneed | Minimum | Life and Annuity Insurance Product Line      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Surrender charge 0.00%    
Surrender charge, period 0 years    
Global Preneed | Maximum      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Discount rates 4.25% 4.30%  
Global Preneed | Maximum | Life insurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Discount rates 3.00% 3.00%  
Global Preneed | Maximum | Life and Annuity Insurance Product Line      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Surrender charge 7.00%    
Surrender charge, period 7 years    
Global Lifestyle      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Favorable (unfavorable) loss development $ 43,081 $ 46,414 36,619
Runoff period 3 years    
Favorable (unfavorable) loss development excluding foreign exchange rate impacts $ 39,463 38,044 29,195
Foreign exchange impacts on claims development 3,618 8,370 7,424
Global Housing      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Favorable (unfavorable) loss development $ 29,792 $ 12,248 $ (33,152)