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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.20%	2.70%	2.40%	2.60%
Expected term (in years)	4 years 3 months 18 days	4 years 2 months 12 days	4 years 3 months 18 days	4 years 3 months 18 days
Expected volatility (percent)	30.00%	33.00%	31.00%	33.00%
Weighted average fair value at grant date (usd per share)	$ 142.63	$ 139.43	$ 155.35	$ 131.53
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.00%	0.00%	2.50%	1.90%
Expected term (in years)	0 years	0 years	1 year 2 months 12 days	1 year 2 months 12 days
Expected volatility (percent)	0.00%	0.00%	31.00%	32.00%
Weighted average fair value at grant date (usd per share)	$ 0	$ 0	$ 154.20	$ 124.61

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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.

+ References

No definition available.

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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