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Share-Based Compensation - Transactions of the Company's Stock Options (Details) shares in Millions	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Stock Options
Unexercised options outstanding - December 31, 2017 (in shares) | shares	0.6
Options granted (in shares) | shares	0.0
Options exercised (in shares) | shares	(0.1)
Options forfeited (in shares) | shares	0.0
Unexercised options outstanding - December 31, 2018 (in shares) | shares	0.5
Exercisable at December 31, 2018 (in shares) | shares	0.1
Weighted Average Exercise Price
Unexercised options outstanding - December 31, 2017 (in usd per share) | $ / shares	$ 122.04
Options granted (in usd per share) | $ / shares	179.54
Options exercised (in usd per share) | $ / shares	99.57
Options forfeited (in usd per share) | $ / shares	122.40
Unexercised stock options outstanding - December 31, 2018 (in usd per share) | $ / shares	130.81
Exercisable stock options at December 31, 2018 (in usd per share) | $ / shares	$ 138.97
Weighted Average Remaining Contractual Life (years)
Stock options outstanding at December 31, 2018 (in years)	3 years 8 months 12 days
Exercisable stock options at December 31, 2018 (in years)	2 years 3 months 18 days

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

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

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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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