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Investments - Mortgage Loan Modifications (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
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Mortgage Loan Modifications      
Number of mortgage loans modified as a troubled debt restructuring 11 10 14
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.6 $ 0.6 $ 0.6
Number of mortgage loans modified as a troubled debt restructuring in payment default 1   2
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 10 9 14
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.5 $ 0.5 $ 0.6
Number of mortgage loans modified as a troubled debt restructuring in payment default     2
First liens      
Mortgage Loan Modifications      
Number of mortgage loans modified as a troubled debt restructuring 1 1  
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.1 $ 0.1  
Number of mortgage loans modified as a troubled debt restructuring in payment default 1    
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $ $ 0.1