ORGANIZATION AND BUSINESS - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 386.0	$ 412.6
Lease revenue	38.7	37.6
Total telecommunications services revenue	424.7	450.2
United States
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	171.7	204.2
Europe
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	205.3	196.5
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 9.0	$ 11.9