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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
12 Months Ended
Oct. 05, 2020
item
Dec. 31, 2020
USD ($)
Dec. 31, 2011
USD ($)
Contingency related to spectrum fees      
Commitments and contingencies      
Spectrum fees paid     $ 2.6
Litigation proceedings and disputes in Guyana      
Commitments and contingencies      
Number of competitors issued service licenses | item 2    
Legal claims regarding tax filings with the Guyana Revenue Authority      
Commitments and contingencies      
Future payments related to disputed tax assessments   $ 44.1  
Accrued contingent liability   $ 5.0  
Legal claims regarding tax filings with the Guyana Revenue Authority | Minimum      
Commitments and contingencies      
Percentage of return on investment ensured by the government of Guyana   15.00%