FAIR VALUE MEASUREMENTS (Details 2) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance at the beginning of the period		$ (347.6)	$ (355.8)
Included in net income (loss):
Arising during the year		23.0	14.1
Included in other comprehensive (loss) income:
Arising during the year		1.1	4.1
Issuances		(1,010.4)	(132.6)
Payments		174.0	116.8
Release from restricted cash		4.0	5.8
Balance at the end of the period	$ (1,155.9)	(1,155.9)	(347.6)	$ (355.8)
Included in net income (loss)
Acquisition-related contingent consideration		$ 23.0	14.1	$ 29.2
Net fair value adjustment			$ 19.0
Sales Based Milestone Payments
Included in net income (loss)
Net fair value adjustment	47.0
Regulatory and Approval Milestones
Included in net income (loss)
Net fair value adjustment	$ 16.0