DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Effects of Interest Rate Swap on Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 30, 2015	Mar. 31, 2013	Nov. 19, 2010
Derivative Instruments, Gain (Loss)
Gain Recognized on Exit of Interest Rate Swap Arrangement	$ 1,600,000	$ 1,600,000
4.625% Senior notes due 2020	0	413,700,000
Long-term debt, less current portion	$ 5,419,000,000.0	5,789,800,000
Debt Instrument, Basis Spread on Variable Rate	2.298%
Balance of Senior Notes Mature During Q4 2020	$ 412,200,000
Senior notes due 2020 [Member]
Derivative Instruments, Gain (Loss)
Debt Instrument, Interest Rate, Stated Percentage	4.625%			2.625%		4.625%
Long-term debt, less current portion	$ 500,000,000.0
Senior notes due 2020 [Member]
Derivative Instruments, Gain (Loss)
Long-term debt, less current portion	0	300,000,000.0			$ 600,000,000.0
4.625SeniorNotesDue2020RedeemedValue	187,900,000
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss)
Fair Value Hedge Liabilities	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)	800,000	6,700,000	$ (7,200,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,600,000	1,600,000	0
Currency Swap [Member]
Derivative Instruments, Gain (Loss)
Fair Value Hedge Liabilities	40,400,000	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)	(43,600,000)	6,000,000.0	21,600,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0	$ 0	$ 0