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Investments - Mortgage Loan Modifications (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
contract
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2018
USD ($)
contract
Jun. 30, 2017
USD ($)
contract
Mortgage Loan Modifications        
Number of mortgage loans modified as a troubled debt restructuring | contract 4 3 7 7
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.2 $ 0.1 $ 0.4 $ 0.4
Number of mortgage loans modified as a troubled debt restructuring in payment default | contract       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 | contract 3 3 6 7
Recorded investment of mortgage loans modified as a troubled debt restructuring | $ $ 0.1 $ 0.1 $ 0.3 $ 0.4
First liens        
Mortgage Loan Modifications        
Number of mortgage loans modified as a troubled debt restructuring | contract 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 | contract       1
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $       $ 0.1