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SHARE-BASED COMPENSATION - Schedule of Estimated Fair Value of Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.50%	2.70%	2.00%	2.70%
Expected term (in years)	3 years 10 months 24 days	4 years 3 months 18 days	4 years 1 month 6 days	4 years 3 months 18 days
Expected volatility (percent)	30.00%	32.00%	30.00%	33.00%
Weighted average fair value at grant date (usd per share)	$ 127.19	$ 159.67	$ 142.22	$ 145.15
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.90%	2.50%	2.10%	2.10%
Expected term (in years)	1 year 2 months 12 days	1 year 3 months 18 days	1 year 2 months 12 days	1 year 3 months 18 days
Expected volatility (percent)	29.00%	31.00%	29.00%	32.00%
Weighted average fair value at grant date (usd per share)	$ 146.48	$ 153.72	$ 148.99	$ 135.84

X

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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