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Investments Federal Home Loan Bank Carrying Amount, Collateral Posted and Advances Received (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank Common Stock $ 30.9 $ 26.7
Federal Home Loan Bank, Advances 420.4 324.2
Federal Home Loan Bank, Collateral Posted to FHLB 1,618.9 1,461.8
Fixed Maturity Securities    
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank, Collateral Posted to FHLB 736.6 553.6
Commercial Mortgage Loans    
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank, Collateral Posted to FHLB $ 882.3 $ 908.2