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COMMITMENTS AND CONTINGENCIES - Litigation (Details)
$ in Millions
3 Months Ended 108 Months Ended
Mar. 31, 2021
USD ($)
subsidiary
Dec. 31, 2016
USD ($)
May 31, 2017
USD ($)
Litigation and Contingencies      
Payments to DOR $ 2.1    
Number of subsidiaries that received assessment notice | subsidiary 2    
Consolidated Communications Enterprise Services Inc. (CCES)      
Litigation and Contingencies      
Litigation amount accrued $ 1.5    
Consolidated Communications of Pennsylvania Company LLC (CCPA)      
Litigation and Contingencies      
Litigation amount accrued $ 0.7    
Assessment by Commonwealth of Pennsylvania Department of Revenue | Maximum      
Litigation and Contingencies      
Potential liability amount guaranteed     $ 5.0
Assessment by Commonwealth of Pennsylvania Department of Revenue | Consolidated Communications Enterprise Services Inc. (CCES)      
Litigation and Contingencies      
Total additional tax liability calculated by the auditors   $ 6.1  
Assessment by Commonwealth of Pennsylvania Department of Revenue | Consolidated Communications of Pennsylvania Company LLC (CCPA)      
Litigation and Contingencies      
Total additional tax liability calculated by the auditors   $ 7.4