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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, 2020 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning balance, Outstanding, Shares | shares	4,303
Granted, Shares | shares	963
Exercised, Shares | shares	(129)
Forfeited, Shares | shares	(56)
Ending balance, Outstanding, Shares | shares	5,081
Ending balance, Exercisable, Shares | shares	2,112
Beginning balance, Outstanding, Weighted Average Exercise Price | $ / shares	$ 62.50
Granted, Weighted Average Exercise Price | $ / shares	63.37
Exercised, Weighted Average Exercise Price | $ / shares	49.26
Forfeited, Weighted Average Exercise Price | $ / shares	72.12
Ending balance, Outstanding, Weighted Average Exercise Price | $ / shares	62.89
Ending balance, Exercisable, Weighted Average Exercise Price | $ / shares	$ 54.58
Ending balance, Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years
Ending balance, Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 3 months 18 days
Ending balance, Outstanding, Aggregate Intrinsic Value | $	$ 57.6
Ending balance, Exercisable, Aggregate Intrinsic Value | $	$ 37.3

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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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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