FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on a Non-Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Assets Measured at Fair Value on a Recurring Basis
Impairment of intangible assets, finite-lived	$ 142.0	$ 215.0	$ 16.0	$ 79.0
Ruconest Divestiture | Held-for-sale
Assets Measured at Fair Value on a Recurring Basis
Impairment of intangible assets, finite-lived		$ 199.0			$ 199.0
Small Business Divestiture | Held-for-sale
Assets Measured at Fair Value on a Recurring Basis
Impairment of intangible assets, finite-lived	88.0				88.0
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Ruconest Divestiture | Held-for-sale
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	82.0				82.0
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Small Business Divestiture | Held-for-sale
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	99.0				99.0
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Reported Value Measurement
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	181.4			0.0	181.4
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	0.0			0.0	0.0
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Significant Other Observable Inputs (Level 2)
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	0.0			0.0	0.0
Prepaid Expenses and Other Current Assets | Nonrecurring adjustment | Significant Unobservable Inputs (Level 3)
Assets Measured at Fair Value on a Recurring Basis
Prepaid expenses and other current assets	$ 181.4			$ 0.0	$ 181.4