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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance $ 33.1 $ 27.0 $ 27.4 $ 32.7
Provision: Financing receivable valuation allowance 17.3   (3.0) (6.0)
Charge-offs: Financing receivable valuation allowance (0.9)   (0.6) (2.4)
Recoveries: Financing receivable valuation allowance 2.8   3.2 3.1
Effect of exchange rates: Financing receivable valuation allowance 0.6      
Ending balance, Financing receivable valuation allowance 52.9 52.9 27.0 27.4
Individually evaluated for impairment, Financing receivable valuation allowance     1.4 1.4
Collectively evaluated for impairment, Financing receivable valuation allowance     25.6 26.0
Individually evaluated for impairment, Financing receivable     11.4 9.2
Collectively evaluated for impairment, Financing receivable     16,502.5 15,355.1
Financing receivables, Total amortized cost 18,103.9 $ 18,103.9 16,513.9 15,364.3
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    
Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 27.3 24.5 24.3 25.8
Provision: Financing receivable valuation allowance 15.5   0.2 (1.5)
Effect of exchange rates: Financing receivable valuation allowance 0.4      
Ending balance, Financing receivable valuation allowance 43.2 43.2 24.5 24.3
Collectively evaluated for impairment, Financing receivable valuation allowance     24.5 24.3
Collectively evaluated for impairment, Financing receivable     15,017.2 13,996.3
Financing receivables, Total amortized cost 15,441.6 15,441.6 15,017.2 13,996.3
Direct financing leases        
Changes in financing receivable valuation allowance        
Provision: Financing receivable valuation allowance 0.1      
Ending balance, Financing receivable valuation allowance 0.1 0.1    
Financing receivables, Total amortized cost 710.8 $ 710.8    
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    
Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 3.3 2.5 3.1 6.9
Provision: Financing receivable valuation allowance 1.5   (3.2) (4.5)
Charge-offs: Financing receivable valuation allowance (0.9)   (0.6) (2.4)
Recoveries: Financing receivable valuation allowance 2.8   3.2 3.1
Effect of exchange rates: Financing receivable valuation allowance 0.2      
Ending balance, Financing receivable valuation allowance 6.9 6.9 2.5 3.1
Individually evaluated for impairment, Financing receivable valuation allowance     1.4 1.4
Collectively evaluated for impairment, Financing receivable valuation allowance     1.1 1.7
Individually evaluated for impairment, Financing receivable     11.4 9.2
Collectively evaluated for impairment, Financing receivable     1,485.3 1,358.8
Financing receivables, Total amortized cost 1,951.5 1,951.5 $ 1,496.7 $ 1,368.0
Reinsurance recoverables        
Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 2.5      
Provision: Financing receivable valuation allowance 0.2      
Ending balance, Financing receivable valuation allowance $ 2.7 $ 2.7