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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance $ 30.1 $ 44.6 $ 32.7 $ 44.9  
Provision: Mortgage loan valuation allowance (1.4) (1.1) (4.2) (0.5)  
Charge-offs: Mortgage loan valuation allowance (0.3) (1.2) (1.9) (4.3)  
Recoveries: Mortgage loan valuation allowance 0.7 1.4 2.5 3.6  
Ending balance, Mortgage loan valuation allowance 29.1 43.7 29.1 43.7  
Individually evaluated for impairment, Mortgage loan valuation allowance 1.9 4.8 1.9 4.8  
Collectively evaluated for impairment, Mortgage loan valuation allowance 27.2 38.9 27.2 38.9  
Individually evaluated for impairment, Mortgage loans 10.9 12.8 10.9 12.8  
Collectively evaluated for impairment, Mortgage loans 14,937.9 14,051.3 14,937.9 14,051.3  
Mortgage loans, Total amortized cost 14,948.8 14,064.1 $ 14,948.8 14,064.1 $ 14,183.2
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 25.8 28.0 $ 25.8 27.4  
Provision: Mortgage loan valuation allowance (0.5) 0.1 (0.5) 0.7  
Ending balance, Mortgage loan valuation allowance 25.3 28.1 25.3 28.1  
Collectively evaluated for impairment, Mortgage loan valuation allowance 25.3 28.1 25.3 28.1  
Collectively evaluated for impairment, Mortgage loans 13,595.3 12,773.5 13,595.3 12,773.5  
Mortgage loans, Total amortized cost 13,595.3 12,773.5 13,595.3 12,773.5 12,897.3
Residential mortgage loans          
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance 4.3 16.6 6.9 17.5  
Provision: Mortgage loan valuation allowance (0.9) (1.2) (3.7) (1.2)  
Charge-offs: Mortgage loan valuation allowance (0.3) (1.2) (1.9) (4.3)  
Recoveries: Mortgage loan valuation allowance 0.7 1.4 2.5 3.6  
Ending balance, Mortgage loan valuation allowance 3.8 15.6 3.8 15.6  
Individually evaluated for impairment, Mortgage loan valuation allowance 1.9 4.8 1.9 4.8  
Collectively evaluated for impairment, Mortgage loan valuation allowance 1.9 10.8 1.9 10.8  
Individually evaluated for impairment, Mortgage loans 10.9 12.8 10.9 12.8  
Collectively evaluated for impairment, Mortgage loans 1,342.6 1,277.8 1,342.6 1,277.8  
Mortgage loans, Total amortized cost $ 1,353.5 $ 1,290.6 $ 1,353.5 $ 1,290.6 $ 1,285.9