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Investments - Impaired Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commercial mortgage loans      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans   $ 9.6  
Unpaid principal balance of impaired mortgage loans   11.1  
Related allowance for impaired mortgage loans   2.4  
Average investment in impaired mortgage loans $ 4.8 17.8 $ 26.6
Interest income recognized on impaired mortgage loans 0.2 0.2 0.5
Brick and mortar      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with no related allowance   5.2  
Recorded investment in impaired mortgage loans with related allowance   4.4  
Unpaid principal balance of impaired mortgage loans with no related allowance   6.7  
Unpaid principal balance of impaired mortgage loans with related allowance   4.4  
Related allowance for impaired mortgage loans   2.4  
Average investment in impaired mortgage loans with no related allowance 2.6 13.4 22.2
Average investment in impaired mortgage loans with related allowance 2.2 4.4 4.4
Interest income recognized on impaired mortgage loans with no related allowance     0.2
Interest income recognized on impaired mortgage loans with related allowance 0.2 0.2 0.3
Residential mortgage loans      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans 23.2 27.1  
Unpaid principal balance of impaired mortgage loans 24.2 27.7  
Related allowance for impaired mortgage loans 7.5 9.0  
Average investment in impaired mortgage loans 25.2 30.1 36.3
Interest income recognized on impaired mortgage loans 0.6 0.8 1.3
Home equity      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with related allowance 13.7 16.5  
Unpaid principal balance of impaired mortgage loans with related allowance 14.8 17.1  
Related allowance for impaired mortgage loans 7.0 8.2  
Average investment in impaired mortgage loans with related allowance 15.1 18.0 20.2
Interest income recognized on impaired mortgage loans with related allowance 0.4 0.6 1.1
First liens      
Impaired mortgage loans      
Recorded investment in impaired mortgage loans with no related allowance 3.6 3.4  
Recorded investment in impaired mortgage loans with related allowance 5.9 7.2  
Unpaid principal balance of impaired mortgage loans with no related allowance 3.6 3.4  
Unpaid principal balance of impaired mortgage loans with related allowance 5.8 7.2  
Related allowance for impaired mortgage loans 0.5 0.8  
Average investment in impaired mortgage loans with no related allowance 3.5 4.0 7.2
Average investment in impaired mortgage loans with related allowance 6.6 8.1 8.9
Interest income recognized on impaired mortgage loans with related allowance $ 0.2 $ 0.2 $ 0.2