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Investments - Troubled Debt Restructuring (Details)
$ in Millions
1 Months Ended 5 Months Ended
Aug. 31, 2013
USD ($)
loan
Dec. 31, 2013
USD ($)
loan
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]        
Troubled debt restructured loans     $ 0.0 $ 5.9
Commercial mortgage loans        
Financing Receivable, Modifications [Line Items]        
Number of troubled debt restructuring loans | loan   8    
Troubled debt restructuring, pre-modification value $ 18.6      
Troubled debt restructuring, post-modification value   $ 18.6    
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