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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance $ 27.6 $ 33.0 $ 27.4 $ 32.7  
Provision: Mortgage loan valuation allowance (0.1) (2.6) (0.5) (2.8)  
Charge-offs: Mortgage loan valuation allowance (0.3) (1.1) (0.4) (1.6)  
Recoveries: Mortgage loan valuation allowance 0.9 0.8 1.6 1.8  
Ending balance, Mortgage loan valuation allowance 28.1 30.1 28.1 30.1  
Individually evaluated for impairment, Mortgage loan valuation allowance 1.5 2.0 1.5 2.0  
Collectively evaluated for impairment, Mortgage loan valuation allowance 26.6 28.1 26.6 28.1  
Individually evaluated for impairment, Mortgage loans 13.3 11.0 13.3 11.0  
Collectively evaluated for impairment, Mortgage loans 16,151.6 14,387.0 16,151.6 14,387.0  
Mortgage loans, Total amortized cost 16,164.9 14,398.0 $ 16,164.9 14,398.0 $ 15,364.3
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 24.7 26.6 $ 24.3 25.8  
Provision: Mortgage loan valuation allowance 0.7 (0.8) 1.1    
Ending balance, Mortgage loan valuation allowance 25.4 25.8 25.4 25.8  
Collectively evaluated for impairment, Mortgage loan valuation allowance 25.4 25.8 25.4 25.8  
Collectively evaluated for impairment, Mortgage loans 14,830.6 13,071.9 14,830.6 13,071.9  
Mortgage loans, Total amortized cost 14,830.6 13,071.9 14,830.6 13,071.9 13,996.3
Residential mortgage loans          
Changes in mortgage loan valuation allowance          
Beginning balance, Mortgage loan valuation allowance 2.9 6.4 3.1 6.9  
Provision: Mortgage loan valuation allowance (0.8) (1.8) (1.6) (2.8)  
Charge-offs: Mortgage loan valuation allowance (0.3) (1.1) (0.4) (1.6)  
Recoveries: Mortgage loan valuation allowance 0.9 0.8 1.6 1.8  
Ending balance, Mortgage loan valuation allowance 2.7 4.3 2.7 4.3  
Individually evaluated for impairment, Mortgage loan valuation allowance 1.5 2.0 1.5 2.0  
Collectively evaluated for impairment, Mortgage loan valuation allowance 1.2 2.3 1.2 2.3  
Individually evaluated for impairment, Mortgage loans 13.3 11.0 13.3 11.0  
Collectively evaluated for impairment, Mortgage loans 1,321.0 1,315.1 1,321.0 1,315.1  
Mortgage loans, Total amortized cost $ 1,334.3 $ 1,326.1 $ 1,334.3 $ 1,326.1 $ 1,368.0