EQUITY-BASED COMPENSATION - Stock Options (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Options
Outstanding at December 31, 2018 (in shares) | shares	332,387
Exercised (in shares) | shares	(116,044)
Outstanding at December 31, 2019 (in shares) | shares	216,343
Options, Vested and Expected to vest at December 31, 2019 (in shares) | shares	216,343
Options, Exercisable at December 31, 2019 (in shares) | shares	216,343
Weighted Average Exercise Price
Outstanding at December 31, 2018 (in dollars per share) | $ / shares	$ 95.04
Exercised (in dollars per share) | $ / shares	82.29
Outstanding at December 31, 2019 (in dollars per share) | $ / shares	89.90
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	89.90
Options, Exercisable, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 89.90
Weighted Average Remaining Term	1 year 8 months 1 day
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	1 year 8 months 1 day
Options, Exercisable, Outstanding, Weighted Average Remaining Contractual Term	1 year 8 months 1 day
Options, Outstanding, Intrinsic Value | $	$ 0
Options, Vested and Expected to Vest, Outstanding, Intrinsic Value | $	0
Options, Exercisable, Outstanding, Intrinsic Value | $	$ 0