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Investments (Details 12) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Commercial mortgage loans          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans $ 4.4   $ 4.4   $ 9.6
Unpaid principal balance of impaired mortgage loans 4.4   4.4   11.1
Related allowance for impaired mortgage loans 3.5   3.5   2.4
Average investment in impaired mortgage loans 4.4 $ 8.0 7.0 $ 18.3  
Interest income recognized on impaired mortgage loans   0.1 0.2 0.3  
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   4.4   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   4.4   4.4
Related allowance for impaired mortgage loans 3.5   3.5   2.4
Average investment in impaired mortgage loans with no related allowance   0.9 2.6 11.2  
Average investment in impaired mortgage loans with related allowance 4.4 7.1 4.4 7.1  
Interest income recognized on impaired mortgage loans with no related allowance       0.1  
Interest income recognized on impaired mortgage loans with related allowance   0.1 0.2 0.2  
Residential mortgage loans          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans 24.7   24.7   27.1
Unpaid principal balance of impaired mortgage loans 25.5   25.5   27.7
Related allowance for impaired mortgage loans 8.0   8.0   9.0
Average investment in impaired mortgage loans 25.4 30.1 26.0 31.4  
Interest income recognized on impaired mortgage loans 0.1 0.2 0.4 0.6  
Home equity          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with related allowance 14.4   14.4   16.5
Unpaid principal balance of impaired mortgage loans with related allowance 15.4   15.4   17.1
Related allowance for impaired mortgage loans 7.4   7.4   8.2
Average investment in impaired mortgage loans with related allowance 14.9 18.0 15.5 18.6  
Interest income recognized on impaired mortgage loans with related allowance 0.1 0.2 0.3 0.5  
First liens          
Impaired mortgage loans          
Recorded investment in impaired mortgage loans with no related allowance 3.2   3.2   3.4
Recorded investment in impaired mortgage loans with related allowance 7.1   7.1   7.2
Unpaid principal balance of impaired mortgage loans with no related allowance 3.2   3.2   3.4
Unpaid principal balance of impaired mortgage loans with related allowance 6.9   6.9   7.2
Related allowance for impaired mortgage loans 0.6   0.6   $ 0.8
Average investment in impaired mortgage loans with no related allowance 3.6 4.1 3.3 4.3  
Average investment in impaired mortgage loans with related allowance $ 6.9 $ 8.0 7.2 8.5  
Interest income recognized on impaired mortgage loans with related allowance     $ 0.1 $ 0.1