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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]        
Option awards $ 2.1 $ 2.3 $ 7.2 $ 5.3
Other share-based awards 10.3 11.5 15.8 18.1
Total share-based compensation before tax 12.4 13.8 23.0 23.4
Tax benefit 2.9 3.3 5.5 5.6
Total share-based compensation expense included in net income (loss) $ 9.5 $ 10.5 $ 17.5 $ 17.8