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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 54.4 $ 50.3 $ 31.8
Tax benefit 9.9 8.7 6.0
Total after tax expense 44.5 41.6 25.8
Restricted Stock Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 24.0 21.5 19.4
Stock Option Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 6.1 5.3 7.0
Performance Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 23.0 22.6 4.2
Director Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 1.3 $ 0.9 $ 1.2