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Investments - Mortgage Loan Modifications (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
item
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
item
Mortgage Loan Modifications        
Number of mortgage loans modified as a troubled debt restructuring | item 4 4 11 8
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.2 $ 0.2 $ 0.6 $ 0.5
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 3 4 10 7
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.1 $ 0.2 $ 0.5 $ 0.4
First liens        
Mortgage Loan Modifications        
Number of mortgage loans modified as a troubled debt restructuring | item 1   1 1
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.1   $ 0.1 $ 0.1
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