PROPERTY AND EQUIPMENT (Schedule of Finance Lease Assets Included in Property Plant and Equipment) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Towers
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,695.9
Accumulated depreciation	(1,062.0)
Property and equipment, net	1,633.9
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment	167.0
Accumulated depreciation	(65.3)
Property and equipment, net	101.7
Land
Property, Plant and Equipment [Line Items]
Property and equipment	150.9
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	45.9
Accumulated depreciation	(13.1)
Property and equipment, net	$ 32.8