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Share-Based Compensation Plans - Total Compensation Expense for Share-Based Payment Arrangements to Employees (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Share-Based Compensation Expense $ 91.4 $ 107.9 $ 130.9
Tax Benefits Recognized 22.9 26.7 32.5
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Share-Based Compensation Expense 78.1 81.4 96.3
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Share-Based Compensation Expense 0.5 1.4 2.6
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Share-Based Compensation Expense $ 12.8 $ 25.1 $ 32.0