FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Liabilities:
Highly liquid investments, maturity period (in months)	3 months
Recurring basis
Assets:
Cash equivalents	$ 484.9	$ 4.6
Restricted cash	8.1	9.1
Liabilities:
Acquisition-related contingent consideration	(705.8)	(308.8)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
Assets:
Cash equivalents	481.9	2.8
Restricted cash	8.1	9.1
Liabilities:
Acquisition-related contingent consideration	0.0	0.0
Significant Other Observable Inputs (Level 2) | Recurring basis
Assets:
Cash equivalents	3.0	1.8
Restricted cash	0.0	0.0
Liabilities:
Acquisition-related contingent consideration	0.0	0.0
Significant Unobservable Inputs (Level 3) | Recurring basis
Assets:
Cash equivalents	0.0	0.0
Restricted cash	$ 0.0	0.0
Liabilities:
Acquisition-related contingent consideration		$ (308.8)