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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options
Outstanding at beginning of period (shares)	1,755	598	723
Replacement Awards (shares)		1,336
Granted (shares)	124	109	103
Forfeited (shares)	(3)	(23)	(22)
Exercised (shares)	(623)	(265)	(206)
Outstanding at end of period (shares)	1,253	1,755	598	723
Options vested and exercisable (shares)	859
Weighted-Average Exercise Price
Outstanding at beginning of period (USD per share)	$ 74.06	$ 59.16	$ 47.79
Replacement Awards (USD per share)		68.96
Granted (USD per share)	200.42	128.22	114.70
Forfeited (USD per share)	112.85	110.13	100.38
Exercised (USD per share)	59.78	33.99	42.65
Outstanding at end of period (USD per share)	93.66	$ 74.06	$ 59.16	$ 47.79
Weighted Average Exercise Price of options vested and exercisable (USD per share)	$ 71.15
Weighted-Average Remaining Contractual Term
Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 18 days	6 years 6 months	6 years 2 months 12 days	6 years 4 months 24 days
Options vested and exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding	$ 152.6	$ 190.3	$ 27.3	$ 37.9
Exercised	85.8	$ 28.8	$ 16.5
Options vested and exercisable, Aggregate Intrinsic Value	$ 123.9

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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 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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