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Investments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]              
Impairments losses on investments $ 0.6 $ 5.5 $ 16.5        
Allowance for credit losses 7.5 7.5 8.5 $ 8.6 $ 10.0 $ 8.5 $ 3.2
Fixed Maturities [Member]              
Schedule of Investments [Line Items]              
Impairments losses on investments 0.2 1.5 10.3        
Fixed Maturities Including Held For Sale [Member]              
Schedule of Investments [Line Items]              
Allowance for credit losses 0.6 0.6     1.9    
Mortgage Loans [Member]              
Schedule of Investments [Line Items]              
Impairments on fixed maturities credit related losses 0.4 4.0 $ 5.4        
Allowance for credit losses $ 7.5 $ 7.5     $ 10.0