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Reserve for Known and Incurred but Not Reported Claims (Activity in Reserve for Known and Incurred but Not Reported Claims) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at beginning of period     $ 1,193.4 $ 1,282.4
Provision related to current year     171.7 165.7
Provision related to prior years     (19.7) (16.7)
Total Provision $ 81.9 $ 79.5 152.0 149.0
Payments, net of recoveries, related to: Current year     69.3 75.8
Payments, net of recoveries, related to: Prior years     95.2 103.6
Total Payments, net of recoveries     164.5 179.4
Other     8.4 0.2
Balance at end of period $ 1,189.3 $ 1,252.2 $ 1,189.3 $ 1,252.2