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TREASURY STOCK - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	12 Months Ended
	Feb. 05, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 07, 2020	Dec. 06, 2020
Equity, Class of Treasury Stock [Line Items]
Treasury stock outstanding (in shares)			4.9	2.9
Treasury stock			$ 235,100,000	$ 119,900,000
Treasury stock, average cost per share (in dollars per share)			$ 47.86	$ 41.87
Stock repurchase program, authorized amount (up to)						$ 225,000,000	$ 225,000,000
Remaining amount under share repurchase							$ 125,000,000
Stock repurchased during period (in shares)	1.3	0.6	2.1
Net proceeds from offering of convertible senior notes			$ 575,000,000	$ 0	$ 0
Accelerated share repurchase program, payment	$ 92,400,000
Accelerated shares repurchased, amount	$ 100,000,000.0		100,000,000
Accelerated share repurchases, percentage of expected total repurchased	80.00%
Convertible Debt
Equity, Class of Treasury Stock [Line Items]
Net proceeds from offering of convertible senior notes			100,000,000.0
Convertible Debt | Certain Purchasers
Equity, Class of Treasury Stock [Line Items]
Net proceeds from offering of convertible senior notes			$ 7,600,000

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