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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, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, outstanding (in shares) | shares 4,303
Granted (in shares) | shares 963
Exercised (in shares) | shares (697)
Forfeited (in shares) | shares (114)
Ending balance, outstanding (in shares) | shares 4,455
Ending balance, exercisable (in shares) | shares 2,540
Weighted Average Exercise Price  
Beginning balance, outstanding, weighted average exercise price (in usd per share) | $ / shares $ 62.50
Granted, weighted average exercise price (in usd per share) | $ / shares 63.37
Exercised, weighted average exercise price (in usd per share) | $ / shares 53.71
Forfeited, weighted average exercise price (in usd per share) | $ / shares 71.27
Ending balance, outstanding, weighted average exercise price (in shares) | $ / shares 63.84
Ending balance, exercisable, weighted average exercise price (in usd per share) | $ / shares $ 59.31
Weighted Average Remaining Contractual Life   
Ending balance, Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 9 months 18 days
Ending balance, Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years
Aggregate Intrinsic Value  
Ending balance, Outstanding, Aggregate Intrinsic Value | $ $ 158.4
Ending balance, Exercisable, Aggregate Intrinsic Value | $ $ 101.8