STOCKHOLDERS' EQUITY - Share Repurchases and Dividends (Details) - USD ($)	1 Months Ended	3 Months Ended							9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 12, 2018	Feb. 07, 2018
Subsequent Event [Line Items]
Stock repurchase program, authorized amount											$ 300,000,000	$ 325,000,000
Stock repurchased during period, shares									0
Treasury stock acquired (in shares)					3,400,000					8,000,000.0
Treasury stock acquired, cost method		$ 300,000	$ 2,100,000	$ 300,000	$ 100,000,000	$ 300,000	$ 117,800,000	$ 209,500,000		$ 325,000,000
Remaining available repurchase amount		$ 200,000,000							$ 200,000,000
Dividends declared (in dollars per share)		$ 0.11	$ 0.11	$ 0.11
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.11