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Stock-Based Compensation - Share-Based Compensation Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Number of shares
Outstanding, beginning balance (in shares)	3,196	3,420
Granted (in shares)	723	609
Exercised (in shares)	(650)	(645)
Canceled (in shares)	(64)	(188)
Outstanding, ending balance (in shares)	3,205	3,196
Exercisable (in shares)	1,627
Weighted-average exercise price per share
Outstanding, beginning balance (in dollars per share)	$ 140.68	$ 121.31
Granted (in dollars per share)	279.10	210.56
Exercised (in dollars per share)	90.43	95.14
Canceled (in dollars per share)	211.57	170.75
Outstanding, ending balance (in dollars per share)	180.69	$ 140.68
Exercisable (in dollars per share)	$ 129.39
Weighted-average contractual term, outstanding	6 years 6 months 30 days	6 years 1 month 2 days
Weighted-average contractual term, exercisable	4 years 8 months 17 days
Aggregate intrinsic value, outstanding	$ 284.0	$ 368.6
Aggregate intrinsic value, exercisable	$ 223.1

X

- Definition

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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- Definition

For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net 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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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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