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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]        
Option awards $ 3.9 $ 2.3 $ 7.1 $ 7.6
Other share-based awards 13.1 7.9 17.0 12.9
Total share-based compensation before tax 17.0 10.2 24.1 20.5
Tax benefit 4.1 2.5 5.9 5.0
Total share-based compensation expense included in net (loss) income $ 12.9 $ 7.7 $ 18.2 $ 15.5