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Investments (Details 11) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance $ 64.9 $ 94.9 $ 69.8 $ 97.4  
Provision: Mortgage loan valuation allowance 7.9 2.0 6.7 19.3  
Charge-offs: Mortgage loan valuation allowance (15.1) (9.9) (21.1) (31.9)  
Recoveries: Mortgage loan valuation allowance 0.3 0.9 2.7 3.2  
Effect of exchange rates: Mortgage loan valuation allowance     (0.1) (0.1)  
Ending balance, Mortgage loan valuation allowance 58.0 87.9 58.0 87.9  
Individually evaluated for impairment, Mortgage loan valuation allowance 12.5 18.9 12.5 18.9  
Collectively evaluated for impairment, Mortgage loan valuation allowance 45.5 69.0 45.5 69.0  
Individually evaluated for impairment, Mortgage loans 39.4 65.4 39.4 65.4  
Collectively evaluated for impairment, Mortgage loans 11,763.5 11,890.6 11,763.5 11,890.6  
Mortgage loans, Total amortized cost 11,802.9 11,956.0 11,802.9 11,956.0 11,603.4
Commercial mortgage loans
         
Mortgage loan valuation allowance disclosures          
Mortgage loans, Days delinquent to be analyzed for valuation allowance     60 days    
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance 26.4 47.7 28.7 51.8  
Provision: Mortgage loan valuation allowance 1.4 0.7 (0.6) 6.7  
Charge-offs: Mortgage loan valuation allowance   (6.2) (0.3) (16.9)  
Recoveries: Mortgage loan valuation allowance   0.2   0.8  
Ending balance, Mortgage loan valuation allowance 27.8 42.4 27.8 42.4  
Individually evaluated for impairment, Mortgage loan valuation allowance 3.1 8.5 3.1 8.5  
Collectively evaluated for impairment, Mortgage loan valuation allowance 24.7 33.9 24.7 33.9  
Individually evaluated for impairment, Mortgage loans 9.8 30.7 9.8 30.7  
Collectively evaluated for impairment, Mortgage loans 10,587.0 10,627.6 10,587.0 10,627.6  
Mortgage loans, Total amortized cost 10,596.8 10,658.3 10,596.8 10,658.3 10,327.7
Residential mortgage loans
         
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance 38.5 47.2 41.1 45.6  
Provision: Mortgage loan valuation allowance 6.5 1.3 7.3 12.6  
Charge-offs: Mortgage loan valuation allowance (15.1) (3.7) (20.8) (15.0)  
Recoveries: Mortgage loan valuation allowance 0.3 0.7 2.7 2.4  
Effect of exchange rates: Mortgage loan valuation allowance     (0.1) (0.1)  
Ending balance, Mortgage loan valuation allowance 30.2 45.5 30.2 45.5  
Individually evaluated for impairment, Mortgage loan valuation allowance 9.4 10.4 9.4 10.4  
Collectively evaluated for impairment, Mortgage loan valuation allowance 20.8 35.1 20.8 35.1  
Individually evaluated for impairment, Mortgage loans 29.6 34.7 29.6 34.7  
Collectively evaluated for impairment, Mortgage loans 1,176.5 1,263.0 1,176.5 1,263.0  
Mortgage loans, Total amortized cost $ 1,206.1 $ 1,297.7 $ 1,206.1 $ 1,297.7 $ 1,275.7