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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Business) (Details)
₨ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
joint_venture
Dec. 31, 2019
INR (₨)
joint_venture
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of joint ventures the Company has a controlling interest in (in joint ventures) | joint_venture 2 2  
Payments to acquire additional interests in subsidiariy $ 68.5    
Adjustment to noncontrolling interest due to merger $ (68.5)   $ (20.5)
Payments to acquire interest in joint venture | ₨   ₨ 523.0  
Ghana Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 51.00% 51.00%  
Number of joint ventures the Company has a controlling interest in (in joint ventures) | joint_venture 1 1  
Uganda Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 51.00% 51.00%  
Number of joint ventures the Company has a controlling interest in (in joint ventures) | joint_venture 1 1  
ATC Europe      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 51.00% 51.00%  
MTN Group Limited | Ghana Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 49.00% 49.00%  
MTN Group Limited | Uganda Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 49.00% 49.00%  
PGGM | ATC Europe      
Schedule of Equity Method Investments [Line Items]      
Company's ownership percentage 49.00% 49.00%  
South African Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Controlling interest percentage 100.00% 100.00% 81.00%
Noncontrolling owners, ownership percentage 19.00% 19.00%  
Additional Paid-in Capital      
Schedule of Equity Method Investments [Line Items]      
Adjustment to noncontrolling interest due to merger $ (49.5)   $ (16.5)
Accumulated Other Comprehensive Loss      
Schedule of Equity Method Investments [Line Items]      
Adjustment to noncontrolling interest due to merger (3.1)   0.5
Noncontrolling Interests      
Schedule of Equity Method Investments [Line Items]      
Adjustment to noncontrolling interest due to merger $ (15.9)   $ (4.5)