INCOME TAXES (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Tax benefit	$ 113,000,000.0	$ 85,700,000
Tax Cuts and Jobs Act, change in tax rate, deferred tax asset, income tax expense		2,400,000
Valuation allowance	194,200,000	151,900,000	$ 142,000,000.0	$ 144,400,000
Unrecognized tax benefits that would impact the ETR	158,100,000	93,700,000
Increase (decrease) in unrecognized tax benefit	72,000,000.0
Decrease in unrecognized tax benefits, from lapse of statue of limitations and effective settlements	2,500,000	9,300,000	400,000
Unrecognized tax benefits, income tax penalties and interest	10,300,000	8,000,000.0	5,000,000.0
Decrease in income tax penalties and interest expense	2,700,000	16,200,000	600,000
Unrecognized tax benefits, income tax penalties and interest accrued	26,600,000	$ 19,100,000
Eaton Towers Acquisition
Income Tax Contingency [Line Items]
Increase (decrease) in unrecognized tax benefit	63,600,000
Minimum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	0
Maximum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 53,000,000.0
Ghana Revenue Authority | Foreign
Income Tax Contingency [Line Items]
Tax benefit related to deduction			$ 17,800,000