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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 40.1 $ 45.1 $ 40.6
Tax benefit 9.2 7.9 6.2
Total after tax expense 30.9 37.2 34.4
Restricted Stock Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 16.6 17.8 15.6
Stock Option Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 6.6 5.3 4.6
Performance Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation 15.6 20.7 19.5
Director Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 1.3 $ 1.3 $ 0.9