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Investments (Details 12) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 121.1 $ 162.6 $ 69.9
Provision: Mortgage loan valuation allowance 44.2 152.9 148.5
Charge-offs: Mortgage loan valuation allowance (66.3) (195.7) (56.0)
Recoveries: Mortgage loan valuation allowance 3.3 1.1  
Effect of exchange rates: Mortgage loan valuation allowance (0.2) 0.2 0.2
Ending balance, Mortgage loan valuation allowance 102.1 121.1 162.6
Individually evaluated for impairment, Mortgage loan valuation allowance 19.5 14.4  
Collectively evaluated for impairment, Mortgage loan valuation allowance 82.6 106.7  
Individually evaluated for impairment, Mortgage loans 141.4 51.3  
Collectively evaluated for impairment, Mortgage loans 10,687.9 11,194.9  
Mortgage loans, Total amortized cost 10,829.3 11,246.2  
Commercial mortgage loans
     
Mortgage loan valuation allowance disclosures      
Mortgage loans, Days delinquent to be analyzed for valuation allowance (in days) 60    
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 80.6 132.5 57.0
Provision: Mortgage loan valuation allowance 17.0 54.1 115.4
Charge-offs: Mortgage loan valuation allowance (32.9) (106.0) (39.9)
Recoveries: Mortgage loan valuation allowance 0.1    
Ending balance, Mortgage loan valuation allowance 64.8 80.6 132.5
Individually evaluated for impairment, Mortgage loan valuation allowance 16.3 9.1  
Collectively evaluated for impairment, Mortgage loan valuation allowance 48.5 71.5  
Individually evaluated for impairment, Mortgage loans 114.0 29.8  
Collectively evaluated for impairment, Mortgage loans 9,347.4 9,659.8  
Mortgage loans, Total amortized cost 9,461.4 9,689.6  
Residential mortgage loans
     
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 40.5 30.1 12.9
Provision: Mortgage loan valuation allowance 27.2 98.8 33.1
Charge-offs: Mortgage loan valuation allowance (33.4) (89.7) (16.1)
Recoveries: Mortgage loan valuation allowance 3.2 1.1  
Effect of exchange rates: Mortgage loan valuation allowance (0.2) 0.2 0.2
Ending balance, Mortgage loan valuation allowance 37.3 40.5 30.1
Individually evaluated for impairment, Mortgage loan valuation allowance 3.2 5.3  
Collectively evaluated for impairment, Mortgage loan valuation allowance 34.1 35.2  
Individually evaluated for impairment, Mortgage loans 27.4 21.5  
Collectively evaluated for impairment, Mortgage loans 1,340.5 1,535.1  
Mortgage loans, Total amortized cost $ 1,367.9 $ 1,556.6