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Stock-Based Compensation - Schedule of Stock-Based Compensation by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Exercise Price Range 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 40.57
Exercise price range, upper range limit (in dollars per share)	$ 52.37
Options outstanding (in shares) | shares	147,840
Average exercise price of options outstanding (in dollars per share)	$ 47.38
Average remaining life of options outstanding	1 year 8 months 12 days
Exercisable options (in shares) | shares	147,840
Average exercise price of exercisable options (in dollars per share)	$ 47.38
Exercise Price Range 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	52.37
Exercise price range, upper range limit (in dollars per share)	$ 78.56
Options outstanding (in shares) | shares	500,259
Average exercise price of options outstanding (in dollars per share)	$ 61.18
Average remaining life of options outstanding	1 year 2 months 12 days
Exercisable options (in shares) | shares	500,259
Average exercise price of exercisable options (in dollars per share)	$ 61.18
Exercise Price Range 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	78.56
Exercise price range, upper range limit (in dollars per share)	$ 104.75
Options outstanding (in shares) | shares	172,777
Average exercise price of options outstanding (in dollars per share)	$ 93.83
Average remaining life of options outstanding	4 years 1 month 6 days
Exercisable options (in shares) | shares	172,777
Average exercise price of exercisable options (in dollars per share)	$ 93.83
Exercise Price Range 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	104.75
Exercise price range, upper range limit (in dollars per share)	$ 130.94
Options outstanding (in shares) | shares	342,805
Average exercise price of options outstanding (in dollars per share)	$ 117.51
Average remaining life of options outstanding	5 years 2 months 12 days
Exercisable options (in shares) | shares	342,805
Average exercise price of exercisable options (in dollars per share)	$ 117.51
Exercise Price Range 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	130.94
Exercise price range, upper range limit (in dollars per share)	$ 157.12
Options outstanding (in shares) | shares	481,652
Average exercise price of options outstanding (in dollars per share)	$ 139.21
Average remaining life of options outstanding	6 years 4 months 24 days
Exercisable options (in shares) | shares	430,101
Average exercise price of exercisable options (in dollars per share)	$ 138.27
Exercise Price Range 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	157.12
Exercise price range, upper range limit (in dollars per share)	$ 183.31
Options outstanding (in shares) | shares	870,883
Average exercise price of options outstanding (in dollars per share)	$ 169.61
Average remaining life of options outstanding	7 years 9 months 18 days
Exercisable options (in shares) | shares	151,337
Average exercise price of exercisable options (in dollars per share)	$ 166.74
Exercise Price Range 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	183.31
Exercise price range, upper range limit (in dollars per share)	$ 209.50
Options outstanding (in shares) | shares	225,450
Average exercise price of options outstanding (in dollars per share)	$ 187.64
Average remaining life of options outstanding	8 years 8 months 12 days
Exercisable options (in shares) | shares	21,750
Average exercise price of exercisable options (in dollars per share)	$ 185.47
Exercise Price Range 8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	209.50
Exercise price range, upper range limit (in dollars per share)	$ 235.68
Options outstanding (in shares) | shares	434,398
Average exercise price of options outstanding (in dollars per share)	$ 215.02
Average remaining life of options outstanding	9 years 3 months 18 days
Exercisable options (in shares) | shares	0
Average exercise price of exercisable options (in dollars per share)	$ 0.00
Exercise Price Range 9
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	235.68
Exercise price range, upper range limit (in dollars per share)	$ 261.87
Options outstanding (in shares) | shares	19,800
Average exercise price of options outstanding (in dollars per share)	$ 253.01
Average remaining life of options outstanding	9 years 9 months 18 days
Exercisable options (in shares) | shares	0
Average exercise price of exercisable options (in dollars per share)	$ 0.00
Exercise price range total shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	40.57
Exercise price range, upper range limit (in dollars per share)	$ 261.87
Options outstanding (in shares) | shares	3,195,864
Average exercise price of options outstanding (in dollars per share)	$ 140.68
Average remaining life of options outstanding	6 years 1 month 6 days
Exercisable options (in shares) | shares	1,766,869
Average exercise price of exercisable options (in dollars per share)	$ 103.48

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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