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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Direct financing leases, Changes in financing receivable valuation allowance        
Beginning balance, Direct financing lease valuation allowance $ 1.1 $ 0.3 $ 0.6 $ 0.4
Provision: Direct financing lease valuation allowance   0.3 0.5 0.2
Foreign currency translation adjustment: Direct financing lease valuation allowance (0.1)   (0.1)  
Ending balance, Direct financing lease valuation allowance 1.0 0.6 1.0 0.6
Total, Changes in financing receivable valuation allowance        
Beginning balance valuation allowance 112.1 68.2 86.8 49.0
Provision 7.1 2.8 31.6 20.9
Charge-offs (0.1)   (0.2) (0.1)
Recoveries 0.4 0.5 1.1 1.9
Foreign currency translation adjustment (0.4) (0.2) (0.2) (0.4)
Ending balance valuation allowance 119.1 71.3 119.1 71.3
Commercial mortgage loans        
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 101.5 63.6 77.9 43.9
Provision: Financing receivable valuation allowance 6.0 2.0 29.5 21.9
Foreign currency translation adjustment: Financing receivable valuation allowance (0.2) (0.1) (0.1) (0.3)
Ending balance, Financing receivable valuation allowance 107.3 65.5 $ 107.3 65.5
Total, Changes in financing receivable valuation allowance        
Mortgage loans, Days delinquent to be analyzed for valuation allowance     60 days  
Residential mortgage loans        
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 6.8 1.7 $ 5.6 2.0
Provision: Financing receivable valuation allowance 1.1 0.5 1.6 (1.1)
Charge-offs: Financing receivable valuation allowance (0.1)   (0.2) (0.1)
Recoveries: Financing receivable valuation allowance 0.4 0.5 1.1 1.9
Foreign currency translation adjustment: Financing receivable valuation allowance (0.1) (0.1)   (0.1)
Ending balance, Financing receivable valuation allowance 8.1 2.6 $ 8.1 2.6
Total, Changes in financing receivable valuation allowance        
Mortgage loans, Days delinquent to be analyzed for valuation allowance     60 days  
Reinsurance recoverables        
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance        
Beginning balance, Financing receivable valuation allowance 2.7 2.6 $ 2.7 2.7
Provision: Financing receivable valuation allowance       (0.1)
Ending balance, Financing receivable valuation allowance $ 2.7 $ 2.6 $ 2.7 $ 2.6