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Derivative Financial Instruments (Details 4) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Derivative Financial Instruments    
Future potential payments in the event of default of an investment in fixed maturity securities that contain embedded credit derivatives $ 0.0  
Hybrid instruments disclosures    
Amortized cost 100.7 $ 95.5
Carrying value $ 100.7 $ 95.5
Weighted average expected life 1 year 6 months 2 years
Corporate debt securities    
Hybrid instruments disclosures    
Amortized cost $ 24.4 $ 24.1
Carrying value $ 24.4 $ 24.1
Weighted average expected life 1 year 3 months 18 days 2 years
Corporate debt securities | A    
Hybrid instruments disclosures    
Amortized cost $ 24.4 $ 24.1
Carrying value $ 24.4 $ 24.1
Weighted average expected life 1 year 3 months 18 days 2 years
Structured finance    
Hybrid instruments disclosures    
Amortized cost $ 76.3 $ 71.4
Carrying value $ 76.3 $ 71.4
Weighted average expected life 1 year 6 months 2 years 1 month 6 days
Structured finance | A    
Hybrid instruments disclosures    
Amortized cost $ 62.1 $ 56.1
Carrying value $ 62.1 $ 56.1
Weighted average expected life 1 year 1 month 6 days 1 year 6 months
Structured finance | BB    
Hybrid instruments disclosures    
Amortized cost $ 5.8 $ 5.8
Carrying value $ 5.8 $ 5.8
Weighted average expected life 1 year 7 months 6 days 2 years 8 months 12 days
Structured finance | CCC    
Hybrid instruments disclosures    
Amortized cost $ 8.4 $ 9.5
Carrying value $ 8.4 $ 9.5
Weighted average expected life 4 years 9 months 18 days 4 years 8 months 12 days