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Investments - Mortgage Loan Modifications (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
item
Mortgage Loan Modifications    
Number of mortgage loans modified as a troubled debt restructuring | item 5 2
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.3 $ 0.2
Number of mortgage loans modified as a troubled debt restructuring in payment default | item 1  
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $ $ 0.1  
Home equity    
Mortgage Loan Modifications    
Number of mortgage loans modified as a troubled debt restructuring | item 5 2
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.3 $ 0.2
First liens    
Mortgage Loan Modifications    
Number of mortgage loans modified as a troubled debt restructuring in payment default | item 1  
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $ $ 0.1