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Investments - Troubled Debt Restructuring (Details)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2013
USD ($)
loan
Sep. 30, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loans   $ 7.9 $ 27.3
Commercial mortgage loans      
Financing Receivable, Modifications [Line Items]      
Number of troubled debt restructuring loans | loan 10 10  
Troubled debt restructured loans   $ 7.9  
Troubled debt restructuring, pre-modification value $ 21.5    
Troubled debt restructuring, post-modification value $ 39.4    
Amount of principal repaid on troubled debt restructurings   $ 31.5  
Cross collateralized, cross defaulted      
Financing Receivable, Modifications [Line Items]      
Number of troubled debt restructuring loans | loan 20    
Troubled debt restructuring, pre-modification value $ 39.4    
Troubled debt restructuring, post-modification value $ 39.4