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REGULATORY FRAMEWORK - Spectrum (Details)
$ in Millions
 12 Months Ended
Mar. 06, 2018
Jan. 04, 2018
USD ($)
item
Jul. 05, 2017
USD ($)
area
item
May 12, 2017
item
Mar. 07, 2017
item
Feb. 20, 2017
item
Jan. 14, 2015
Dec. 31, 2018
item
Feb. 27, 2018
USD ($)
Dec. 31, 2017
USD ($)
Regulatory framework                    
Usage period of the auctioned frequency bands               15 years    
Spectrum allocation period     15 years              
Number of areas free of interference in spectrum allocation | area     13              
Number of provincial capitals in spectrum allocation     18              
Amount payable for spectrum allocation | $     $ 55.9              
Penalty percentage on spectrum allocation     15              
License period for Cellular Mobile Telephony and Internet Access and Data Transmission Services 5 years                  
Number of licensees for subscription television services               2    
Term non-satellite audiovisual communication services spectrum             15 years      
1033-E/17 | Minimum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)           905        
Frequency band awarded, two (in MHz)           950        
1033-E/17 | Maximum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)           915        
Frequency band awarded, two (in MHz)           960        
1034-E/17 | Minimum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)           2,500        
1034-E/17 | Maximum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)           2,690        
1299-E/17                    
Regulatory framework                    
Migration period         2 years          
1299-E/17 | Minimum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)         2,550          
Frequency band awarded, two (in MHz)         (2,670)          
1299-E/17 | Maximum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)         2,560          
Frequency band awarded, two (in MHz)         2,680          
3687-E/17 | Minimum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)       2,500            
3687-E/17 | Maximum                    
Regulatory framework                    
Frequency band awarded, one (in MHz)       2,690            
Nucleo                    
Regulatory framework                    
Deposit to be paid | $                   $ 15.0
Number of sub-bands awarded   2                
Consideration paid for each sub-bands | $   $ 12.0                
Auction price cancellation | $                 $ 9.0