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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	May 31, 2016	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (shares)	811	723	759	894
Granted (shares)	73	103	124	145
Forfeited (shares)	(1)	(22)	0	(8)
Exercised (shares)	(124)	(206)	(160)	(220)
Outstanding, end of period (shares)	759	598	723	811	894
Options vested and exercisable (shares)		427
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Weighted Average Exercise Price, beginning of period (USD per share)	$ 31.81	$ 47.79	$ 37.51	$ 25.47
Granted, Weighted Average Exercise Price (USD per share)	74.66	114.70	79.45	55.92
Forfeited, Weighted Average Exercise Price (USD per share)	22.93	100.38	0.00	16.10
Exercised, Weighted Average Exercise Price (USD per share)	22.26	42.65	23.50	22.46
Outstanding, Weighted Average Exercise Price, end of period (USD per share)	$ 37.51	59.16	$ 47.79	$ 31.81	$ 25.47
Options vested and exercisable, Weighted Average Exercise Price (USD per share)		$ 44.34
Weighted-Average Remaining Contractual Term
Outstanding, Weighted Average Remaining Contractual Term	6 years	6 years 2 months	6 years 5 months	5 years 9 months 18 days	5 years 2 months 8 days
Options vested and exercisable, Weighted Average Remaining Contractual Term		5 years 2 months
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 36.8	$ 37.9	$ 24.5	$ 23.9
Exercised	6.5	16.5	10.1	9.4
Outstanding at end of period	$ 24.5	27.3	$ 37.9	$ 36.8	$ 23.9
Options vested and exercisable, Aggregate Intrinsic Value		$ 25.1

X

- Definition

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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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