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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance $ 135.4 $ 83.2 $ 83.2 $ 46.4 $ 48.9
Provision: Financing receivable valuation allowance 50.6 23.9 51.1 34.7 (5.7)
Charge-offs: Financing receivable valuation allowance (11.9) (0.1) (0.4) (0.2) (0.5)
Recoveries: Financing receivable valuation allowance 0.4 0.7 1.5 2.3 3.7
Ending balance, Financing receivable valuation allowance 174.5 107.7 135.4 83.2 46.4
Commercial mortgage loans          
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 126.1 75.5 75.5 42.0 40.5
Provision: Financing receivable valuation allowance 48.2 23.4 50.6 33.5 1.5
Charge-offs: Financing receivable valuation allowance (11.8)        
Ending balance, Financing receivable valuation allowance $ 162.5 98.9 $ 126.1 75.5 42.0
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days   60 days    
Residential mortgage loans          
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance $ 6.1 5.0 $ 5.0 1.7 5.7
Provision: Financing receivable valuation allowance 2.5 0.5   1.2 (7.2)
Charge-offs: Financing receivable valuation allowance (0.1) (0.1) (0.4) (0.2) (0.5)
Recoveries: Financing receivable valuation allowance 0.4 0.7 1.5 2.3 3.7
Ending balance, Financing receivable valuation allowance $ 8.9 6.1 $ 6.1 5.0 1.7
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days   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 $ 2.7 2.7 2.7
Provision: Financing receivable valuation allowance (0.1)   0.5    
Ending balance, Financing receivable valuation allowance 3.1 2.7 3.2 2.7 2.7
Other financing receivables          
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance          
Beginning balance, Financing receivable valuation allowance 0.0 0.0 0.0 0.0  
Ending balance, Financing receivable valuation allowance $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 0.0