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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance $ 33.1 $ 27.4  
Provision: Financing receivable valuation allowance 12.9 (0.4)  
Charge-offs: Financing receivable valuation allowance (0.1) (0.1)  
Recoveries: Financing receivable valuation allowance 0.6 0.7  
Ending balance, Financing receivable valuation allowance 46.5 27.6  
Individually evaluated for impairment, Financing receivable valuation allowance   1.4  
Collectively evaluated for impairment, Financing receivable valuation allowance   26.2  
Individually evaluated for impairment, Financing receivable   8.1  
Collectively evaluated for impairment, Financing receivable   15,617.0  
Financing receivables, Total amortized cost $ 17,335.3 15,625.1 $ 16,513.9
Commercial mortgage loans      
Financing receivable valuation allowance disclosures      
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days    
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance $ 27.3 24.3  
Provision: Financing receivable valuation allowance 10.4 0.4  
Charge-offs: Financing receivable valuation allowance (0.0)    
Ending balance, Financing receivable valuation allowance 37.7 24.7  
Collectively evaluated for impairment, Financing receivable valuation allowance   24.7  
Collectively evaluated for impairment, Financing receivable   14,274.2  
Financing receivables, Total amortized cost $ 15,142.6 14,274.2 15,017.2
Residential mortgage loans      
Financing receivable valuation allowance disclosures      
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days    
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance $ 3.3 3.1  
Provision: Financing receivable valuation allowance 2.3 (0.8)  
Charge-offs: Financing receivable valuation allowance (0.1) (0.1)  
Recoveries: Financing receivable valuation allowance 0.6 0.7  
Ending balance, Financing receivable valuation allowance 6.1 2.9  
Individually evaluated for impairment, Financing receivable valuation allowance   1.4  
Collectively evaluated for impairment, Financing receivable valuation allowance   1.5  
Individually evaluated for impairment, Financing receivable   8.1  
Collectively evaluated for impairment, Financing receivable   1,342.8  
Financing receivables, Total amortized cost 1,547.1 $ 1,350.9 $ 1,496.7
Direct financing leases      
Changes in financing receivable valuation allowance      
Provision: Financing receivable valuation allowance 0.2    
Ending balance, Financing receivable valuation allowance 0.2    
Financing receivables, Total amortized cost 645.6    
Reinsurance recoverables      
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance 2.5    
Ending balance, Financing receivable valuation allowance 2.5    
Residential mortgage loans      
Changes in financing receivable valuation allowance      
Charge-offs: Financing receivable valuation allowance $ (0.0)