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Investments (Details 11) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 97.4 $ 102.1  
Provision: Mortgage loan valuation allowance 6.5 13.6  
Charge-offs: Mortgage loan valuation allowance (15.4) (27.7)  
Recoveries: Mortgage loan valuation allowance 1.0 1.2  
Effect of exchange rates: Mortgage loan valuation allowance   0.1  
Ending balance, Mortgage loan valuation allowance 89.5 89.3  
Individually evaluated for impairment, Mortgage loan valuation allowance 13.5 10.8  
Collectively evaluated for impairment, Mortgage loan valuation allowance 76.0 78.5  
Individually evaluated for impairment, Mortgage loans 52.9 71.7  
Collectively evaluated for impairment, Mortgage loans 11,614.5 11,326.5  
Mortgage loans, Total amortized cost 11,667.4 11,398.2 11,617.1
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 51.8 64.8  
Provision: Mortgage loan valuation allowance (0.5) 7.0  
Charge-offs: Mortgage loan valuation allowance (9.5) (19.4)  
Ending balance, Mortgage loan valuation allowance 41.8 52.4  
Individually evaluated for impairment, Mortgage loan valuation allowance 2.7 6.2  
Collectively evaluated for impairment, Mortgage loan valuation allowance 39.1 46.2  
Individually evaluated for impairment, Mortgage loans 17.5 40.3  
Collectively evaluated for impairment, Mortgage loans 10,269.0 9,976.5  
Mortgage loans, Total amortized cost 10,286.5 10,016.8 10,235.1
Residential mortgage loans
     
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 45.6 37.3  
Provision: Mortgage loan valuation allowance 7.0 6.6  
Charge-offs: Mortgage loan valuation allowance (5.9) (8.3)  
Recoveries: Mortgage loan valuation allowance 1.0 1.2  
Effect of exchange rates: Mortgage loan valuation allowance   0.1  
Ending balance, Mortgage loan valuation allowance 47.7 36.9  
Individually evaluated for impairment, Mortgage loan valuation allowance 10.8 4.6  
Collectively evaluated for impairment, Mortgage loan valuation allowance 36.9 32.3  
Individually evaluated for impairment, Mortgage loans 35.4 31.4  
Collectively evaluated for impairment, Mortgage loans 1,345.5 1,350.0  
Mortgage loans, Total amortized cost $ 1,380.9 $ 1,381.4 $ 1,382.0