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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]    
Option awards $ 3.0 $ 3.7
Other share-based awards 6.6 1.8
Total share-based compensation before tax 9.6 5.5
Tax benefit 2.3 1.3
Total share-based compensation expense included in net income (loss) $ 7.3 $ 4.2