DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018	Mar. 31, 2012 USD ($) derivative_instrument
Derivative [Line Items]
Total exposure to floating rate interest rates	25.00%		25.00%		1.00%
Foreign Exchange Contract
Derivative [Line Items]
Notional amounts of foreign currency exchange contracts	$ 1,192,500,000		$ 1,192,500,000
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	(3,100,000)	$ 1,700,000	21,900,000	$ 2,200,000
March 2012 Interest-Rate Swap Termination
Derivative [Line Items]
Number of interest-rate swap agreements terminated | derivative_instrument						2
Notional amount						$ 350,000,000
Deferred gain (loss) on discontinuation of interest rate fair value hedge						$ 46,100,000
Amortization of interest rate swap gains	0	$ 1,300,000	0	$ 6,000,000.0
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Notional amounts of foreign currency exchange contracts	$ 19,500,000		$ 19,500,000