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REDEEMABLE NONCONTROLLING INTERESTS - Narrative (Details)
€ in Millions, $ in Millions, ₨ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
INR (₨)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
INR (₨)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
INR (₨)
Dec. 31, 2018
Apr. 21, 2016
Redeemable Noncontrolling Interest [Line Items]                    
Consideration paid for redemption   $ 175.7     $ 861.7   $ 425.7      
Purchases of redeemable noncontrolling interests   37.9     0.0   0.0      
Additional Paid-in Capital                    
Redeemable Noncontrolling Interest [Line Items]                    
Purchases of redeemable noncontrolling interests   84.2     209.2   52.4      
Accumulated Other Comprehensive Loss                    
Redeemable Noncontrolling Interest [Line Items]                    
Purchases of redeemable noncontrolling interests   $ (46.3)     $ (209.2)   $ (52.4)      
Tata Teleservices                    
Redeemable Noncontrolling Interest [Line Items]                    
Percentage of ownership before transaction         100.00% 100.00% 50.00% 50.00%    
Consideration paid for redemption         $ 337.3 ₨ 24.8 $ 425.7 ₨ 29.4    
IDFC                    
Redeemable Noncontrolling Interest [Line Items]                    
Percentage of ownership before transaction             100.00% 100.00%    
ATC TIPL                    
Redeemable Noncontrolling Interest [Line Items]                    
Ownership Percentage   100.00% 100.00% 100.00% 92.00% 92.00% 79.00% 79.00% 63.00%  
Noncontrolling ownership interest percentage         8.00% 8.00% 21.00% 21.00% 37.00%  
ATC TIPL | Macquarie                    
Redeemable Noncontrolling Interest [Line Items]                    
Percentage of ownership before transaction   100.00% 100.00% 100.00%            
Consideration paid for redemption   $ 173.2 ₨ 12.9              
Ghana And Uganda Subsidiaries                    
Redeemable Noncontrolling Interest [Line Items]                    
Consideration paid for redemption         $ 524.4          
Payments for repurchase of redeemable noncontrolling interest, interest portion $ 1.4                  
Ownership Percentage   100.00% 100.00% 100.00% 51.00% 51.00%        
Eure-et-Loir                    
Redeemable Noncontrolling Interest [Line Items]                    
Consideration paid for redemption   $ 2.5   € 2.2            
Viom Transaction                    
Redeemable Noncontrolling Interest [Line Items]                    
Percentage of interests acquired                   51.00%