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Investments (Details 11) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 69.8 $ 97.4  
Provision: Mortgage loan valuation allowance (1.6) 6.5  
Charge-offs: Mortgage loan valuation allowance (3.4) (15.4)  
Recoveries: Mortgage loan valuation allowance 1.7 1.0  
Ending balance, Mortgage loan valuation allowance 66.5 89.5  
Individually evaluated for impairment, Mortgage loan valuation allowance 11.9 13.5  
Collectively evaluated for impairment, Mortgage loan valuation allowance 54.6 76.0  
Individually evaluated for impairment, Mortgage loans 36.4 52.9  
Collectively evaluated for impairment, Mortgage loans 11,508.5 11,614.5  
Mortgage loans, Total amortized cost 11,544.9 11,667.4 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 28.7 51.8  
Provision: Mortgage loan valuation allowance (1.9) (0.5)  
Charge-offs: Mortgage loan valuation allowance (0.3) (9.5)  
Ending balance, Mortgage loan valuation allowance 26.5 41.8  
Individually evaluated for impairment, Mortgage loan valuation allowance 2.4 2.7  
Collectively evaluated for impairment, Mortgage loan valuation allowance 24.1 39.1  
Individually evaluated for impairment, Mortgage loans 4.4 17.5  
Collectively evaluated for impairment, Mortgage loans 10,294.6 10,269.0  
Mortgage loans, Total amortized cost 10,299.0 10,286.5 10,327.7
Residential mortgage loans
     
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 41.1 45.6  
Provision: Mortgage loan valuation allowance 0.3 7.0  
Charge-offs: Mortgage loan valuation allowance (3.1) (5.9)  
Recoveries: Mortgage loan valuation allowance 1.7 1.0  
Ending balance, Mortgage loan valuation allowance 40.0 47.7  
Individually evaluated for impairment, Mortgage loan valuation allowance 9.5 10.8  
Collectively evaluated for impairment, Mortgage loan valuation allowance 30.5 36.9  
Individually evaluated for impairment, Mortgage loans 32.0 35.4  
Collectively evaluated for impairment, Mortgage loans 1,213.9 1,345.5  
Mortgage loans, Total amortized cost $ 1,245.9 $ 1,380.9 $ 1,275.7