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Share-Based Compensation Plans - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based compensation $ 89.8    
Weighted average period of recognition of unvested share-based compensation (in years) 3 years    
Share-based compensation expense $ 126.5 $ 119.4 $ 118.2
Share-based Payment Arrangement, Nonemployee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion ratio 1    
Granted (in shares) 22,824 18,220 20,405
Stock units granted during period $ 2.0 $ 1.5 $ 1.6
Share-based compensation expense $ 2.1 $ 1.6 $ 1.7
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) 11,211,977    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 0 0 0
Stock options | Maximum      
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 | Minimum      
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) 186,460 262,557 219,314
Performance based units vesting period 3 years    
Restricted stock units weighted average grant date fair value (in usd per share) $ 113.22 $ 79.89 $ 93.97
Shares outstanding (in shares) 621,465 675,690 613,450
Aggregate intrinsic value of options granted $ 84.9 $ 69.3 $ 51.8
Vesting term of units granted 10 months 24 days 1 year 1 month 6 days 1 year 1 month 6 days
Share-based compensation expense $ 25.5 $ 28.0 $ 22.5
Performance Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage at which units can vest 150.00%    
Performance Stock Units | Minimum      
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) 1,015,151 1,182,007 1,166,376
Restricted stock units weighted average grant date fair value (in usd per share) $ 112.08 $ 79.96 $ 91.56
Fair value of restricted stock units vested $ 91.9 $ 89.6 $ 85.9
Shares outstanding (in shares) 2,573,178 2,696,550  
Share-based compensation expense $ 101.0 $ 91.4 $ 95.7
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%    
Performance based units vesting period 4 years