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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]    
Option awards $ 5.3 $ 5.8
Other share-based awards 5.0 6.2
Total share-based compensation before tax 10.3 12.0
Tax benefit 2.5 2.8
Total share-based compensation expense included in net income $ 7.8 $ 9.2