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Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Credit Loss [Abstract]      
Available-for-sale Investments, Allowance for Credit Loss, Beginning Balance $ 2.9 $ 7.7  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded 0.3 0.3  
Available-for-sale investment, allowance for credit loss, increase (decrease) (0.9) (3.6)  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold (1.3) (1.5)  
Available-for-sale Investments, Allowance for Credit Loss, Ending Balance 1.0 2.9 $ 7.7
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance 3.7 3.7  
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) 23.8 0.0 0.4
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance 27.5 3.7 3.7
Accounts Receivable, Allowance for Credit Loss, Beginning Balance 21.0 25.0  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 3.6 (4.0)  
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 24.6 $ 21.0 $ 25.0