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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance $ 52.9 $ 33.1 $ 27.4
Provision: Financing receivable valuation allowance (6.6) 17.3 (3.0)
Charge-offs: Financing receivable valuation allowance (0.5) (0.9) (0.6)
Recoveries: Financing receivable valuation allowance 3.6 2.8 3.2
Effect of exchange rates: Financing receivable valuation allowance (0.4) 0.6  
Ending balance, Financing receivable valuation allowance 49.0 52.9 27.0
Individually evaluated for impairment, Financing receivable valuation allowance     1.4
Collectively evaluated for impairment, Financing receivable valuation allowance     25.6
Individually evaluated for impairment, Financing receivable     11.4
Collectively evaluated for impairment, Financing receivable     16,502.5
Financing receivables, Total amortized cost $ 20,324.5 18,103.9 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 $ 43.2 27.3 24.3
Provision: Financing receivable valuation allowance 1.0 15.5 0.2
Effect of exchange rates: Financing receivable valuation allowance (0.3) 0.4  
Ending balance, Financing receivable valuation allowance 43.9 43.2 24.5
Collectively evaluated for impairment, Financing receivable valuation allowance     24.5
Collectively evaluated for impairment, Financing receivable     15,017.2
Financing receivables, Total amortized cost 16,394.7 15,441.6 15,017.2
Direct financing leases      
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance 0.1    
Provision: Financing receivable valuation allowance 0.4 0.1  
Effect of exchange rates: Financing receivable valuation allowance (0.1)    
Ending balance, Financing receivable valuation allowance 0.4 0.1  
Financing receivables, Total amortized cost $ 609.9 710.8  
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 $ 6.9 3.3 3.1
Provision: Financing receivable valuation allowance (8.0) 1.5 (3.2)
Charge-offs: Financing receivable valuation allowance (0.5) (0.9) (0.6)
Recoveries: Financing receivable valuation allowance 3.6 2.8 3.2
Effect of exchange rates: Financing receivable valuation allowance   0.2  
Ending balance, Financing receivable valuation allowance 2.0 6.9 2.5
Individually evaluated for impairment, Financing receivable valuation allowance     1.4
Collectively evaluated for impairment, Financing receivable valuation allowance     1.1
Individually evaluated for impairment, Financing receivable     11.4
Collectively evaluated for impairment, Financing receivable     1,485.3
Financing receivables, Total amortized cost 3,319.9 1,951.5 $ 1,496.7
Reinsurance recoverables      
Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance 2.7 2.5  
Provision: Financing receivable valuation allowance   0.2  
Ending balance, Financing receivable valuation allowance $ 2.7 $ 2.7