TREASURY STOCK (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 28, 2017
Equity, Class of Treasury Stock
Number of shares repurchased of common stock from employees in lieu of cash or withholding taxes due	1.8
Cash payment for repurchase of common stock from employees in lieu of cash or withholding taxes due	$ 111.2
February 2017 Repurchase Plan
Equity, Class of Treasury Stock
Stock repurchase program, authorized amount		$ 500.0
Common stock repurchased (in shares)	4.6
Average purchase price (in dollars per share)	$ 54.91
Price of stock less broker commissions	$ 249.9