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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance $ 48.7 $ 28.1 $ 33.1 $ 27.4  
Provision: Financing receivable valuation allowance 1.4   16.0 (0.5)  
Charge-offs: Financing receivable valuation allowance (0.1)   (0.3) (0.4)  
Recoveries: Financing receivable valuation allowance 0.6 0.7 1.8 2.3  
Ending balance, Financing receivable valuation allowance 50.6 28.8 50.6 28.8  
Individually evaluated for impairment, Financing receivable valuation allowance   1.5   1.5  
Collectively evaluated for impairment, Financing receivable valuation allowance   27.3   27.3  
Individually evaluated for impairment, Financing receivable   12.4   12.4  
Collectively evaluated for impairment, Financing receivable   16,508.0   16,508.0  
Financing receivables, Total amortized cost 17,562.2 16,520.4 $ 17,562.2 16,520.4 $ 16,513.9
Commercial mortgage loans          
Financing receivable valuation allowance disclosures          
Mortgage loans, Days delinquent to be analyzed for valuation allowance     60 days    
Accrued interest receivable written off 0.0   $ 0.0    
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 40.4 25.4 27.3 24.3  
Provision: Financing receivable valuation allowance 1.7 0.9 14.8 2.0  
Ending balance, Financing receivable valuation allowance 42.1 26.3 42.1 26.3  
Collectively evaluated for impairment, Financing receivable valuation allowance   26.3   26.3  
Collectively evaluated for impairment, Financing receivable   15,018.6   15,018.6  
Financing receivables, Total amortized cost 15,207.2 15,018.6 15,207.2 15,018.6 15,017.2
Direct financing leases          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 0.2        
Provision: Financing receivable valuation allowance (0.1)   0.1    
Ending balance, Financing receivable valuation allowance 0.1   0.1    
Financing receivables, Total amortized cost 638.7   $ 638.7    
Residential mortgage loans          
Financing receivable valuation allowance disclosures          
Mortgage loans, Days delinquent to be analyzed for valuation allowance     60 days    
Accrued interest receivable written off 0.0   $ 0.0    
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 5.6 2.7 3.3 3.1  
Provision: Financing receivable valuation allowance (0.3) (0.9) 1.0 (2.5)  
Charge-offs: Financing receivable valuation allowance (0.1)   (0.3) (0.4)  
Recoveries: Financing receivable valuation allowance 0.6 0.7 1.8 2.3  
Ending balance, Financing receivable valuation allowance 5.8 2.5 5.8 2.5  
Individually evaluated for impairment, Financing receivable valuation allowance   1.5   1.5  
Collectively evaluated for impairment, Financing receivable valuation allowance   1.0   1.0  
Individually evaluated for impairment, Financing receivable   12.4   12.4  
Collectively evaluated for impairment, Financing receivable   1,489.4   1,489.4  
Financing receivables, Total amortized cost 1,716.3 $ 1,501.8 1,716.3 $ 1,501.8 $ 1,496.7
Reinsurance recoverables          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 2.5   2.5    
Provision: Financing receivable valuation allowance 0.1   0.1    
Ending balance, Financing receivable valuation allowance $ 2.6   $ 2.6