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SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 12.9 $ 12.0 $ 14.1
Additions (Charged to costs and expenses) 16.5 15.9 13.1
Deductions (15.8) (15.0) (15.2)
Balance at end of period 13.6 12.9 12.0
Allowance for doubtful accounts [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 6.4 5.1 6.2
Additions (Charged to costs and expenses) 15.9 15.9 13.1
Deductions (15.5) (14.6) (14.2)
Balance at end of period 6.8 6.4 5.1
Allowance for uncollectible reinsurance recoverables [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 6.5 6.9 7.9
Additions (Charged to costs and expenses) 0.6 0.0 0.0
Deductions (0.3) (0.4) (1.0)
Balance at end of period $ 6.8 $ 6.5 $ 6.9