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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance $ 42.7 $ 48.7 $ 52.9 $ 33.1  
Provision: Financing receivable valuation allowance (3.4) 1.4 (14.9) 16.0  
Charge-offs: Financing receivable valuation allowance (0.2) (0.1) (0.5) (0.3)  
Recoveries: Financing receivable valuation allowance 1.0 0.6 2.7 1.8  
Effect of exchange rates: Financing receivable valuation allowance (0.1)   (0.2)    
Ending balance, Financing receivable valuation allowance 40.0 50.6 40.0 50.6  
Financing receivables, Total amortized cost 20,086.4   $ 20,086.4   $ 18,103.9
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 36.6 40.4 $ 43.2 27.3  
Provision: Financing receivable valuation allowance (2.1) 1.7 (8.6) 14.8  
Effect of exchange rates: Financing receivable valuation allowance (0.1)   (0.2)    
Ending balance, Financing receivable valuation allowance 34.4 42.1 34.4 42.1  
Financing receivables, Total amortized cost 16,332.6   16,332.6   15,441.6
Direct financing leases          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 0.3 0.2 0.1    
Provision: Financing receivable valuation allowance   (0.1) 0.2 0.1  
Ending balance, Financing receivable valuation allowance 0.3 0.1 0.3 0.1  
Financing receivables, Total amortized cost 623.4   $ 623.4   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 3.2 5.6 $ 6.9 3.3  
Provision: Financing receivable valuation allowance (1.4) (0.3) (6.5) 1.0  
Charge-offs: Financing receivable valuation allowance (0.2) (0.1) (0.5) (0.3)  
Recoveries: Financing receivable valuation allowance 1.0 0.6 2.7 1.8  
Ending balance, Financing receivable valuation allowance 2.6 5.8 2.6 5.8  
Financing receivables, Total amortized cost 3,130.4   3,130.4   $ 1,951.5
Reinsurance recoverables          
Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 2.6 2.5 2.7 2.5  
Provision: Financing receivable valuation allowance 0.1 0.1   0.1  
Ending balance, Financing receivable valuation allowance $ 2.7 $ 2.6 $ 2.7 $ 2.6