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Share-Based Compensation - Summary of Stock Option Activity and Related Information (Detail) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 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	(171)
Forfeited (in shares) | shares	(20)
Ending balance, outstanding (in shares) | shares	4,311
Ending balance, exercisable (in shares) | shares	2,180
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	55.22
Forfeited, weighted average exercise price (in usd per share) | $ / shares	70.87
Ending balance, outstanding, weighted average exercise price (in shares) | $ / shares	72.80
Ending balance, exercisable, weighted average exercise price (in usd per share) | $ / shares	$ 61.60
Weighted Average Remaining Contractual Life
Ending balance, Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 4 months 24 days
Ending balance, Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 8 months 12 days
Aggregate Intrinsic Value
Ending balance, Outstanding, Aggregate Intrinsic Value | $	$ 236.8
Ending balance, Exercisable, Aggregate Intrinsic Value | $	$ 144.1

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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