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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]    
Option awards $ 5.8 $ 5.1
Other share-based awards 6.2 5.5
Total share-based compensation before tax 12.0 10.6
Tax benefit 2.8 2.6
Total share-based compensation expense included in net income $ 9.2 $ 8.0