INCOME TAXES - RECONCILIATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax expense	$ 145.3	$ 124.8	$ 3.4
U.S. state income taxes	3.3	3.2	(7.6)
Foreign tax rate differential	(33.9)	(48.5)	(39.9)
Non-deductible charges/losses and other	4.9	5.0	8.9
Research and development credit	(15.2)	(13.6)	(12.7)
Income Tax Expense (Benefit), Total	$ 104.4	$ 70.9	$ (47.9)