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STOCKHOLDERS' EQUITY - Schedule of Share Repurchase Activities (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Value of shares repurchased	$ 200.0		$ 200.0
Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	0.4		(0.4)
Common Stock | Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	0.4	0.0	0.4	0.0
Average price per share (in dollars per share)	$ 477.44	$ 0	$ 477.44	$ 0
Value of shares repurchased	$ 200.0	$ 0.0	$ 200.0	$ 0.0

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