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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance $ 46.5 $ 27.6 $ 33.1 $ 27.4  
Provision: Financing receivable valuation allowance 1.7 (0.1) 14.6 (0.5)  
Charge-offs: Financing receivable valuation allowance (0.1) (0.3) (0.2) (0.4)  
Recoveries: Financing receivable valuation allowance 0.6 0.9 1.2 1.6  
Ending balance, Financing receivable valuation allowance 48.7 28.1 48.7 28.1  
Individually evaluated for impairment, Financing receivable valuation allowance   1.5   1.5  
Collectively evaluated for impairment, Financing receivable valuation allowance   26.6   26.6  
Individually evaluated for impairment, Financing receivable   13.3   13.3  
Collectively evaluated for impairment, Financing receivable   16,151.6   16,151.6  
Financing receivables, Total amortized cost 17,389.7 16,164.9 $ 17,389.7 16,164.9 $ 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 37.7 24.7 27.3 24.3  
Provision: Financing receivable valuation allowance 2.7 0.7 13.1 1.1  
Ending balance, Financing receivable valuation allowance 40.4 25.4 40.4 25.4  
Collectively evaluated for impairment, Financing receivable valuation allowance   25.4   25.4  
Collectively evaluated for impairment, Financing receivable   14,830.6   14,830.6  
Financing receivables, Total amortized cost 15,095.5 14,830.6 $ 15,095.5 14,830.6 15,017.2
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 6.1 2.9 3.3 3.1  
Provision: Financing receivable valuation allowance (1.0) (0.8) 1.3 (1.6)  
Charge-offs: Financing receivable valuation allowance (0.1) (0.3) (0.2) (0.4)  
Recoveries: Financing receivable valuation allowance 0.6 0.9 1.2 1.6  
Ending balance, Financing receivable valuation allowance 5.6 2.7 5.6 2.7  
Individually evaluated for impairment, Financing receivable valuation allowance   1.5   1.5  
Collectively evaluated for impairment, Financing receivable valuation allowance   1.2   1.2  
Individually evaluated for impairment, Financing receivable   13.3   13.3  
Collectively evaluated for impairment, Financing receivable   1,321.0   1,321.0  
Financing receivables, Total amortized cost 1,647.1 $ 1,334.3 1,647.1 $ 1,334.3 $ 1,496.7
Direct financing leases          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 0.2        
Provision: Financing receivable valuation allowance     0.2    
Ending balance, Financing receivable valuation allowance 0.2   0.2    
Financing receivables, Total amortized cost 647.1   647.1    
Reinsurance recoverables          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 2.5   2.5    
Ending balance, Financing receivable valuation allowance $ 2.5   $ 2.5