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Share-Based Compensation - Summary of Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, outstanding (in shares) | shares 3,950
Granted (in shares) | shares 552
Exercised (in shares) | shares (675)
Forfeited (in shares) | shares (96)
Ending balance, outstanding (in shares) | shares 3,731
Ending balance, exercisable (in shares) | shares 2,410
Weighted Average Exercise Price  
Beginning balance, outstanding, weighted average exercise price (in usd per share) | $ / shares $ 65.16
Granted, weighted average exercise price (in usd per share) | $ / shares 121.91
Exercised, weighted average exercise price (in usd per share) | $ / shares 60.32
Forfeited, weighted average exercise price (in usd per share) | $ / shares 84.03
Ending balance, outstanding, weighted average exercise price (in shares) | $ / shares 73.95
Ending balance, exercisable, weighted average exercise price (in usd per share) | $ / shares $ 65.00
Weighted Average Remaining Contractual Life   
Ending balance, outstanding, weighted average remaining contractual life 6 years 1 month 6 days
Ending balance, exercisable, weighted average remaining contractual life 4 years 7 months 6 days
Aggregate Intrinsic Value  
Ending balance, outstanding, aggregate intrinsic value | $ $ 186.8
Ending balance, exercisable, aggregate intrinsic value | $ $ 142.2