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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2007
Dec. 31, 2016
Dec. 31, 2011
Contingency related to spectrum fees      
Commitments and contingencies      
Spectrum fees paid     $ 2.6
Letter of credit sub-facility      
Commitments and contingencies      
Outstanding letters of credit   $ 10.6  
Drawdowns   $ 0.0  
Universal Service Administrative Company      
Commitments and contingencies      
Commitment fee (as a percent)   1.75%  
Lawsuit filed by CTL      
Commitments and contingencies      
Damages asserted $ 200.0    
Litigation proceedings and disputes in Guyana      
Commitments and contingencies      
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity   5 years  
Lawsuit filed by GTT against Digicel      
Commitments and contingencies      
Damages asserted   $ 9.0  
Punitive damages   5.0  
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%