v3.26.1
Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]        
Impairments on investments $ 2.0 $ 0.0    
Allowance for credit losses 8.5 $ 5.7 $ 8.1 $ 5.7
Federal Home Loan Bank of Boston [Member]        
Schedule of Investments [Line Items]        
Securities on loan, fair value 332.6   339.2  
Fixed Maturities [Member]        
Schedule of Investments [Line Items]        
Impairments on investments 0.5      
Mortgage Loans [Member]        
Schedule of Investments [Line Items]        
Impairments on investments 1.5      
Allowance for credit losses $ 8.5   $ 8.1