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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]    
Option awards $ 3.2 $ 5.3
Other share-based awards 3.9 5.0
Total share-based compensation before tax 7.1 10.3
Tax benefit 1.8 2.5
Total share-based compensation expense included in net income $ 5.3 $ 7.8