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Investments - Impaired Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Residential mortgage loans          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans $ 13.3   $ 13.3   $ 9.2
Unpaid principal balance of impaired mortgage loans 14.3   14.3   10.3
Related allowance for impaired mortgage loans 1.5   1.5   1.4
Average investment in impaired mortgage loans 10.7 $ 11.6 11.4 $ 11.8  
Interest income recognized on impaired mortgage loans 0.1 0.1 0.1 0.2  
First liens          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with no related allowance 0.9   0.9   1.6
Recorded investment in impaired mortgage loans with related allowance 7.7   7.7   2.2
Unpaid principal balance of impaired mortgage loans with no related allowance 0.9   0.9   1.6
Unpaid principal balance of impaired mortgage loans with related allowance 7.7   7.7   2.2
Related allowance for impaired mortgage loans 0.2   0.2    
Average investment in impaired mortgage loans with no related allowance 0.9 0.8 1.3 0.8  
Average investment in impaired mortgage loans with related allowance 4.9 3.9 5.0 3.9  
Interest income recognized on impaired mortgage loans with related allowance   0.1   0.1  
Home equity          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with related allowance 4.7   4.7   5.4
Unpaid principal balance of impaired mortgage loans with related allowance 5.7   5.7   6.5
Related allowance for impaired mortgage loans 1.3   1.3   $ 1.4
Average investment in impaired mortgage loans with related allowance 4.9 $ 6.9 5.1 7.1  
Interest income recognized on impaired mortgage loans with related allowance $ 0.1   $ 0.1 $ 0.1