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Share-Based Compensation Plans - Narrative (Detail) - USD ($)
$ / shares in Units, $ 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]      
Unrecognized compensation cost related to unvested share-based compensation $ 71.8    
Weighted average period of recognition of unvested share-based compensation (in years) 3 years    
Share-based compensation expense $ 95.5 $ 91.4 $ 107.9
Share-based Payment Arrangement, Nonemployee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Granted (in shares) 13,968 20,148 14,232
Stock units granted during period $ 1.5 $ 1.5 $ 1.3
Share-based compensation expense $ 1.6 $ 1.6 $ 1.4
Stock Incentive Plan 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock authorized for issuance under the Plan (in shares) 20,000,000    
Stock Incentive Plan 2012 Plan and 2002 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grant under the Plan (in shares) 16,181,087    
Stock options under the Plan, the 2002 Plan, and the 1992 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 0 0 0
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option maximum term (in years) 10 years    
Options vest and become exercisable after the date of grant (in years) 4 years    
Stock options under the Plan, the 2002 Plan, and the 1992 Plan | Lower Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of the fair value for options to purchase common stock on the date the options are granted 100.00%    
Options vest and become exercisable after the date of grant (in years) 1 year    
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Granted (in shares) 204,539 205,847 213,044
Restricted stock units weighted average grant date fair value (in usd per share) $ 97.77 $ 100.83 $ 93.00
Performance based units vesting period 3 years    
Shares outstanding (in shares) 622,817 660,510 667,741
Aggregate intrinsic value of options granted $ 74.5 $ 61.5 $ 70.9
Vesting term of units granted 1 year 1 year 1 year
Share-based compensation expense $ 17.3 $ 12.8 $ 25.1
Performance stock units, granted | Upper Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 150.00%    
Performance stock units, granted | Lower Limit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 0.00%    
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 846,433 772,848 855,112
Restricted stock units weighted average grant date fair value (in usd per share) $ 99.31 $ 99.58 $ 91.89
Fair value of restricted stock units vested $ 89.4 $ 100.2 $ 89.3
Restricted Stock Unit Awards | Fourth Anniversary Of Grant Date      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Percentage at which units can vest 25.00%