TREASURY STOCK (Narrative) (Details) - USD ($)		12 Months Ended
	Oct. 25, 2016	Dec. 31, 2017	Dec. 31, 2016
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock, shares, retired (in shares)	17,800,000
Treasury stock, aggregate cost	$ 367,100,000	$ 121,644,000	$ 123,051,000
Stock repurchase program, authorized amount (up to)	$ 150,000,000.0
Amount available for share repurchase under this latest authorization		$ 150,000,000.0
Treasury stock outstanding (in shares)	2,900,000	2,900,000	2,900,000
Treasury stock, cost		$ 121,600,000	$ 123,100,000
Treasury stock, price per share (in dollars per share)		$ 41.77	$ 41.78
Stock repurchased during period (in shares)		0	0