PROPERTY AND EQUIPMENT (Summary of Property and Equipment Including FInance Lease Right-of-Use Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total	$ 19,325.6
Less accumulated depreciation	(7,241.2)
Property and equipment, net	$ 12,084.4
Total		$ 17,717.2
Less accumulated depreciation		(6,470.1)
Property and equipment, net		11,247.1
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Towers
Property, Plant and Equipment [Line Items]
Total	$ 13,930.7
Total		12,777.9
Towers | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Equipment
Property, Plant and Equipment [Line Items]
Total	$ 1,897.3
Total		1,667.3
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total	$ 638.9
Total		628.5
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	32 years
Land and Improvements
Property, Plant and Equipment [Line Items]
Total	$ 2,486.1
Total		2,285.4
Land and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total	$ 372.6
Total		$ 358.1