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Investments - Impaired Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Residential mortgage loans      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans $ 18.0   $ 19.2
Unpaid principal balance of impaired mortgage loans 19.0   20.2
Related allowance for impaired mortgage loans 5.8   5.9
Average investment in impaired mortgage loans 18.7 $ 22.5  
Interest income recognized on impaired mortgage loans 0.1 0.1  
Home equity      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with related allowance 13.0   13.0
Unpaid principal balance of impaired mortgage loans with related allowance 14.1   14.1
Related allowance for impaired mortgage loans 5.4   5.5
Average investment in impaired mortgage loans with related allowance 13.0 13.4  
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 0.4   1.5
Recorded investment in impaired mortgage loans with related allowance 4.6   4.7
Unpaid principal balance of impaired mortgage loans with no related allowance 0.4   1.5
Unpaid principal balance of impaired mortgage loans with related allowance 4.5   4.6
Related allowance for impaired mortgage loans 0.4   $ 0.4
Average investment in impaired mortgage loans with no related allowance 1.0 3.4  
Average investment in impaired mortgage loans with related allowance $ 4.7 $ 5.7