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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]        
Option awards $ 2.5 $ 2.3 $ 9.7 $ 7.6
Other share-based awards 12.8 13.1 28.6 31.2
Total share-based compensation before tax 15.3 15.4 38.3 38.8
Tax benefit 3.7 3.7 9.2 9.3
Total share-based compensation expense included in net income $ 11.6 $ 11.7 $ 29.1 $ 29.5