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COMMON STOCK - Schedule of Weighted-Average Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	2.90%	1.80%	1.10%
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	29.00%	33.00%	33.00%
Expected life	5 years	4 years 7 months 6 days	4 years 6 months
Fair value, per share (in dollars per share)	$ 42.51	$ 33.74	$ 31.00
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.90%	0.50%	0.30%
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	33.00%	33.00%	29.00%
Expected life	7 months 6 days	7 months 6 days	7 months 6 days
Fair value, per share (in dollars per share)	$ 36.53	$ 25.69	$ 22.09

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

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

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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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- 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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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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