DERIVATIVES - Narrative (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Jul. 31, 2011 USD ($)	Nov. 30, 2010 USD ($)	Dec. 31, 2015 USD ($) derivative	Jun. 30, 2014 derivative	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 31, 2014	May. 31, 2014 USD ($)	Dec. 31, 2009 USD ($)
Derivative [Line Items]
No transfers between levels in fair value hierarchy					$ 0	$ 0
Balance of effective portion of changes in hedge instruments included in accumulated other comprehensive income			$ (10,100,000)		(10,100,000)
Derivatives qualifying as cash flow hedges deferred in other comprehensive income					(19,700,000)	52,900,000	$ (24,200,000)
Money market funds, carrying value			510,100,000		$ 510,100,000	395,400,000
Cash Flow Hedging
Derivative [Line Items]
Maximum period for discontinuation of foreign currency cash flow hedge due to forecasted transaction is probable of not occurring					60 days
Balance of effective portion of changes in hedge instruments included in accumulated other comprehensive income			$ (10,100,000)		$ (10,100,000)	(10,400,000)	(3,200,000)
Derivatives qualifying as cash flow hedges deferred in other comprehensive income					$ (21,400,000)	(12,100,000)
Foreign Exchange Forward | Cash Flow Hedging
Derivative [Line Items]
Foreign currency purchases anticipated time frame					18 months
Ineffectiveness related to the company's foreign exchange hedges on earnings					$ 900,000
Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount							$ 500,000,000
Derivatives qualifying as cash flow hedges deferred in other comprehensive income						45,000,000
Derivative, net hedge ineffectiveness						500,000
Amortization of settlement related to incremental interest expense					1,400,000	900,000
Derivative, number of instruments entered into | derivative			6	8
Interest Rate Swap | Fair Value Hedging | Terminated Contract
Derivative [Line Items]
Derivative, notional amount	$ 500,000,000	$ 200,000,000
Proceeds from termination of hedge	$ 23,500,000	$ 15,600,000
Interest Rate Swap, 2019 settled swaps
Derivative [Line Items]
Amortization of settlement related to incremental interest expense					1,900,000	1,900,000
Interest Rate Swap, 2014 settled swaps
Derivative [Line Items]
Amortization of settlement related to incremental interest expense					0
Commodity Contract
Derivative [Line Items]
Balance of effective portion of changes in hedge instruments included in accumulated other comprehensive income			$ 700,000		700,000	1,300,000
Derivative, notional amount			2,000,000.0		2,000,000.0
Interest Rate Swap, 2019 open swaps
Derivative [Line Items]
Reduction in interest expense					10,000,000	$ 6,000,000
Interest Rate Swap, 2020 open swaps
Derivative [Line Items]
Reduction in interest expense					1,100,000
Minimum | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Forward interest rates of swaps								3.79%
Maximum | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Forward interest rates of swaps								3.94%
Notes 4.90 Percent Due 2019 | Interest rate swaps 2019 note | Fair Value Hedging
Derivative [Line Items]
Derivative, notional amount									$ 700,000,000	$ 700,000,000
Notes 4.90 Percent Due 2019 | Interest Rate Swap, 2019 open swaps | Fair Value Hedging
Derivative [Line Items]
Derivative, notional amount			700,000,000.0		700,000,000.0
Notes 3.0 Percent Due 2020 | Interest rate swaps 2020 note | Fair Value Hedging
Derivative [Line Items]
Derivative, notional amount			$ 750,000,000		$ 750,000,000