INCOME TAXES (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax expense	$ 124.8	$ 3.4	$ 83.8
U.S. state income taxes	3.2	(7.6)	2.3
Foreign tax rate differential	(48.5)	(39.9)	(30.6)
Non-deductible charges/losses and other	5.0	8.9	3.0
Research and development credit	(13.6)	(12.7)	(13.9)
Income Tax Expense (Benefit), Total	$ 70.9	$ (47.9)	$ 44.6