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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - Employee stock option - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Options
Outstanding at beginning of period (shares)	598
Granted (shares)	109
Forfeited (shares)	0
Exercised (shares)	(170)
Outstanding at end of period (shares)	537	598
Options vested and exercisable (shares)	319
Weighted-Average Exercise Price
Outstanding at beginning of period (USD per share)	$ 59.16
Granted (USD per share)	128.22
Forfeited (USD per share)	0.00
Exercised (USD per share)	35.91
Outstanding at end of period (USD per share)	80.59	$ 59.16
Options vested and exercisable (USD per share)	$ 58.70
Weighted-Average Remaining Contractual Term
Outstanding	7 years 1 month	6 years 2 months
Options vested and exercisable	5 years 8 months
Aggregate Intrinsic Value
Outstanding	$ 30.0	$ 27.3
Options vested and exercisable	$ 24.8

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Number of share options (or share units) exercised during the current period.

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