COMMITMENTS AND CONTINGENCIES (Narrative) (Details) ₨ in Millions, $ in Millions				12 Months Ended
	Dec. 05, 2016 USD ($)	Dec. 05, 2016 INR (₨)	Mar. 27, 2015 USD ($) communications_site renewalPeriod	Dec. 31, 2020 USD ($) communications_site communicationSite renewalOption	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Aggregate purchase price				$ 1,031.7	$ 991.3	$ 913.2
Loss contingency, foreign income tax assessment	$ 69.8	₨ 4,750
Verizon Transaction
Loss Contingencies [Line Items]
Capital leased assets, number of units | communications_site			11,250
Right to lease, weighted average term			28 years
Aggregate purchase option price for towers			$ 5,000.0
Customer lease, initial term			10 years
Successive terms to renew lease | renewalPeriod			8
AT&T Transaction
Loss Contingencies [Line Items]
Number of units leased | communications_site				2,100
Aggregate purchase option price for towers				$ 973.4
Successive terms to renew lease | renewalOption				5
Renewal term			5 years	5 years
Operating lease, term of contract				27 years
Number of sites acquired life to date | communicationSite				331
Number of communications sites acquired | communicationSite				103
Aggregate purchase price				$ 55.7