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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Direct financing leases, Changes in financing receivable valuation allowance    
Beginning balance, Direct financing lease valuation allowance $ 0.9 $ 0.6
Provision: Direct financing lease valuation allowance (0.1) (0.1)
Foreign currency translation adjustment: Direct financing lease valuation allowance (0.1) 0.1
Ending balance, Direct financing lease valuation allowance 0.7 0.6
Total, Changes in financing receivable valuation allowance    
Beginning balance valuation allowance 139.6 86.8
Provision 17.8 3.6
Charge-offs   (0.1)
Recoveries 0.3 0.2
Foreign currency translation adjustment (0.5) 0.4
Ending balance valuation allowance 157.2 90.9
Allowance recorded 157.2 90.9
Commercial mortgage loans    
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance    
Beginning balance, Financing receivable valuation allowance 128.8 77.9
Provision: Financing receivable valuation allowance 16.0 3.8
Foreign currency translation adjustment: Financing receivable valuation allowance (0.3) 0.2
Ending balance, Financing receivable valuation allowance $ 144.5 81.9
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 $ 6.7 5.6
Provision: Financing receivable valuation allowance 1.9 0.1
Charge-offs: Financing receivable valuation allowance   (0.1)
Recoveries: Financing receivable valuation allowance 0.3 0.2
Foreign currency translation adjustment: Financing receivable valuation allowance (0.1) 0.1
Ending balance, Financing receivable valuation allowance $ 8.8 5.9
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 $ 3.2 2.7
Provision: Financing receivable valuation allowance   (0.2)
Ending balance, Financing receivable valuation allowance 3.2 2.5
Other loans    
Total, Changes in financing receivable valuation allowance    
Ending balance valuation allowance 0.0 0.0
Allowance recorded $ 0.0 $ 0.0