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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at beginning of period     $ 1,325.3 $ 1,283.8
Provision related to current year     174.4 239.7
Provision related to prior years     (2.6) 9.2
Total Provision $ 89.5 $ 126.5 171.8 248.9
Payments, net of recoveries, related to: Current year     78.6 92.8
Payments, net of recoveries, related to: Prior years     100.9 129.7
Total Payments, net of recoveries     179.5 222.5
Other     4.6 (2.1)
Balance at end of period $ 1,322.2 $ 1,308.1 $ 1,322.2 $ 1,308.1