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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2011
Contingency related to spectrum fees    
Commitments and contingencies    
Spectrum fees paid   $ 2.6
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%