FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013
Corporate brands | Amortization and Impairments of Finite-lived Intangible Assets
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Impairment charges on intangible assets	$ 31.5
Non-recurring basis | Ezogabine Retigabine | Amortization and Impairments of Finite-lived Intangible Assets
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Impairment charges on intangible assets		551.6
Non-recurring basis | Ezogabine Retigabine | In-process Research and Development Impairments and Other Charges
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Impairment charges on intangible assets		93.8
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Ezogabine Retigabine
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Fair value of assets measured on nonrecurring basis		$ 45.1