PROPERTY AND EQUIPMENT -Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 924.3	$ 905.5	$ 883.1
Amortization of right-of-use asset	$ 153.0	$ 168.1