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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]    
Option awards $ 5.1 $ 3.0
Other share-based awards 5.5 6.6
Total share-based compensation before tax 10.6 9.6
Tax benefit 2.6 2.3
Total share-based compensation expense included in net income $ 8.0 $ 7.3