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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]        
Option awards $ 2.0 $ 2.5 $ 9.7 $ 9.7
Other share-based awards 7.9 12.8 24.7 28.6
Total share-based compensation before tax 9.9 15.3 34.4 38.3
Tax benefit 2.4 3.7 8.2 9.2
Total share-based compensation expense included in net income $ 7.5 $ 11.6 $ 26.2 $ 29.1