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Investments - Impaired Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Residential mortgage loans      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans $ 9.2 $ 12.5  
Unpaid principal balance of impaired mortgage loans 10.3 13.4  
Related allowance for impaired mortgage loans 1.4 4.5  
Average investment in impaired mortgage loans 11.0 15.9 $ 21.3
Interest income recognized on impaired mortgage loans 0.3 0.4 0.4
First liens      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with no related allowance 1.6 0.9  
Recorded investment in impaired mortgage loans with related allowance 2.2 4.0  
Unpaid principal balance of impaired mortgage loans with no related allowance 1.6 0.8  
Unpaid principal balance of impaired mortgage loans with related allowance 2.2 4.0  
Related allowance for impaired mortgage loans   0.2  
Average investment in impaired mortgage loans with no related allowance 1.3 1.2 2.6
Average investment in impaired mortgage loans with related allowance 3.2 4.4 5.3
Interest income recognized on impaired mortgage loans with related allowance 0.1 0.2 0.1
Home equity      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with related allowance 5.4 7.6  
Unpaid principal balance of impaired mortgage loans with related allowance 6.5 8.6  
Related allowance for impaired mortgage loans 1.4 4.3  
Average investment in impaired mortgage loans with related allowance 6.5 10.3 13.4
Interest income recognized on impaired mortgage loans with related allowance $ 0.2 $ 0.2 $ 0.3