DERIVATIVES AND OTHER FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2011	Nov. 30, 2010	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jun. 30, 2015	Oct. 31, 2014	May. 31, 2014	Dec. 31, 2013	Nov. 30, 2009
Derivative disclosures
No transfers between levels in fair value hierarchy					$ 0		$ 0
Net asset/(liability) of derivatives designated as hedging instruments			$ 27,400,000		27,400,000		11,100,000
Accumulated other comprehensive income, related to cash flow hedge			17,800,000	$ 700,000	17,800,000	$ 700,000	10,400,000				$ 3,200,000
Cash flow hedge gain (loss) to be reclassified within twelve months					17,300,000
Derivatives qualifying as cash flow hedges deferred in other comprehensive income			12,700,000	6,000,000	22,000,000	(64,300,000)
Money market funds, classified as Level Two			165,600,000		165,600,000		395,400,000
Commodity option
Derivative disclosures
Notional Amount of Underlying			4,400,000		4,400,000
Derivatives qualifying as cash flow hedges deferred in other comprehensive income					400,000		800,000
Interest rate swap
Derivative disclosures
Notional amount of underlying debt											$ 500,000,000
Derivatives qualifying as cash flow hedges deferred in other comprehensive income						45,000,000
Derivative, net hedge ineffectiveness loss						500,000
Amortization of deferred hedge gains			400,000		1,100,000
Foreign exchange contract
Derivative disclosures
Derivatives qualifying as cash flow hedges deferred in other comprehensive income					$ 23,000,000	(100,000)
Cash flow hedges
Derivative disclosures
Number of days from originally forecasted transaction date to discontinue cash flow hedge accounting					60 days
Cash flow hedges | Foreign currency forward contract
Derivative disclosures
Maximum duration of foreign exchange contracts used to hedge intercompany purchases (in months)					1 year 6 months
Cash flow hedges | Foreign exchange contract
Derivative disclosures
Ineffective portion of foreign exchange hedges					$ 700,000	800,000
Notional Amount of Underlying			189,500,000		189,500,000		247,900,000
Net asset/(liability) of derivatives designated as hedging instruments							$ 12,800,000	$ 13,300,000
Fair value hedges
Derivative disclosures
Notional Amount of Underlying										$ 700,000,000
Fair value hedges | Interest rate swap
Derivative disclosures
Notional amount of underlying debt												$ 700,000,000
Amortization of deferred hedge gains			2,400,000	2,500,000	7,600,000	3,600,000
Lower limit | Designated as hedging instruments | Interest rate swap
Derivative disclosures
Derivative, forward interest rate									3.79%
Upper limit | Designated as hedging instruments | Interest rate swap
Derivative disclosures
Derivative, forward interest rate									3.94%
Terminated contract | Fair value hedges | Interest rate swap
Derivative disclosures
Notional Amount of Underlying	$ 500,000,000	$ 200,000,000
Amortization of deferred hedge gains			$ 500,000	$ 500,000	$ 1,400,000	$ 1,400,000
Cash received	$ 23,500,000	$ 15,600,000