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Investments - Impaired Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Residential mortgage loans          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans $ 11.0   $ 11.0   $ 12.5
Unpaid principal balance of impaired mortgage loans 12.0   12.0   13.4
Related allowance for impaired mortgage loans 2.0   2.0   4.5
Average investment in impaired mortgage loans 11.6 $ 15.7 11.8 $ 16.4  
Interest income recognized on impaired mortgage loans 0.1 0.1 0.2 0.2  
Home equity          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with related allowance 6.6   6.6   7.6
Unpaid principal balance of impaired mortgage loans with related allowance 7.6   7.6   8.6
Related allowance for impaired mortgage loans 1.8   1.8   4.3
Average investment in impaired mortgage loans with related allowance 6.9 10.8 7.1 10.8  
Interest income recognized on impaired mortgage loans with related allowance     0.1 0.1  
First liens          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with no related allowance 0.7   0.7   0.9
Recorded investment in impaired mortgage loans with related allowance 3.7   3.7   4.0
Unpaid principal balance of impaired mortgage loans with no related allowance 0.7   0.7   0.8
Unpaid principal balance of impaired mortgage loans with related allowance 3.7   3.7   4.0
Related allowance for impaired mortgage loans 0.2   0.2   $ 0.2
Average investment in impaired mortgage loans with no related allowance 0.8 0.5 0.8 1.1  
Average investment in impaired mortgage loans with related allowance 3.9 4.4 3.9 4.5  
Interest income recognized on impaired mortgage loans with related allowance $ 0.1 $ 0.1 $ 0.1 $ 0.1