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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions, ₨ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
segment
Dec. 31, 2019
segment
Sep. 30, 2019
segment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
INR (₨)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Concentration Risk [Line Items]              
Purchase of redeemable noncontrolling interest $ 524.4     $ 425.7 ₨ 29.4 $ 425.7  
Purchase of redeemable noncontrolling interest $ 0.0     0.0      
Number of reportable segments | segment 6 6 5        
Additional Paid-in Capital              
Concentration Risk [Line Items]              
Purchase of redeemable noncontrolling interest $ (142.2)     (52.4)      
Accumulated Other Comprehensive Loss              
Concentration Risk [Line Items]              
Purchase of redeemable noncontrolling interest $ 142.2     $ 52.4      
ATC Europe              
Concentration Risk [Line Items]              
Ownership interest percentage 51.00%            
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 49.00%            
ATC, TIPL              
Concentration Risk [Line Items]              
Ownership interest percentage 79.00% 63.00%     63.00% 63.00%  
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 21.00%           37.00%
Ghana and Uganda Subsidiaries              
Concentration Risk [Line Items]              
Ownership interest percentage 100.00% 51.00%     51.00% 51.00%  
Purchase of redeemable noncontrolling interest $ 524.4            
Payments for repurchase of redeemable noncontrolling interest, interest portion $ 1.4            
Uganda Subsidiary              
Concentration Risk [Line Items]              
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 49.00%            
Ghana Subsidiary              
Concentration Risk [Line Items]              
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 49.00%