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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at beginning of period     $ 1,282.4 $ 1,325.3
Provision related to current year     165.7 174.4
Provision related to prior years     (16.7) (2.6)
Total Provision $ 79.5 $ 89.5 149.0 171.8
Payments, net of recoveries, related to: Current year     75.8 78.6
Payments, net of recoveries, related to: Prior years     103.6 100.9
Total Payments, net of recoveries     179.4 179.5
Other     0.2 4.6
Balance at end of period $ 1,252.2 $ 1,322.2 $ 1,252.2 $ 1,322.2