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TREASURY STOCK - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 05, 2020	Jun. 30, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 07, 2020
Equity, Class of Treasury Stock [Line Items]
Treasury stock (in shares)			4.9
Treasury stock			$ 234,500,000		$ 235,100,000
Treasury stock, average cost per share (in dollars per share)			$ 47.86		$ 47.86
Stock repurchase program, authorized amount (up to)						$ 225,000,000.0
Remaining amount under share repurchase			$ 225,000,000.0
Stock repurchased during period (in shares)	1.3	0.6			2.1
Net proceeds from offering of convertible senior notes			$ 0	$ 575,000,000
Accelerated share repurchase program, payment	$ 92,400,000
Accelerated shares repurchased, amount	$ 100,000,000.0			$ 92,368,000
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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