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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance      
Charge-offs: Financing receivable valuation allowance $ (0.2)    
Direct financing leases, Changes in financing receivable valuation allowance      
Beginning balance, Direct financing lease valuation allowance 0.4 $ 0.1  
Provision: Direct financing lease valuation allowance 0.2 0.4 $ 0.1
Foreign currency translation adjustment: Direct financing lease valuation allowance   (0.1)  
Ending balance, Direct financing lease valuation allowance 0.6 0.4 0.1
Total, Changes in financing receivable valuation allowance      
Beginning balance valuation allowance 49.0 52.9 33.1
Provision 35.7 (6.6) 17.3
Charge-offs   (0.5) (0.9)
Recoveries 2.3 3.6 2.8
Foreign currency translation adjustment   (0.4) 0.6
Ending balance valuation allowance 86.8 49.0 52.9
Commercial mortgage loans      
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance      
Beginning balance, Financing receivable valuation allowance 43.9 43.2 27.3
Provision: Financing receivable valuation allowance 34.0 1.0 15.5
Foreign currency translation adjustment: Financing receivable valuation allowance   (0.3) 0.4
Ending balance, Financing receivable valuation allowance $ 77.9 43.9 43.2
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 $ 2.0 6.9 3.3
Provision: Financing receivable valuation allowance 1.5 (8.0) 1.5
Charge-offs: Financing receivable valuation allowance (0.2) (0.5) (0.9)
Recoveries: Financing receivable valuation allowance 2.3 3.6 2.8
Foreign currency translation adjustment: Financing receivable valuation allowance     0.2
Ending balance, Financing receivable valuation allowance $ 5.6 2.0 6.9
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 2.7 2.5
Provision: Financing receivable valuation allowance     0.2
Ending balance, Financing receivable valuation allowance $ 2.7 $ 2.7 $ 2.7