ACQUISITIONS - NARRATIVE (Details) R$ in Millions, $ in Millions, ₨ in Billions										3 Months Ended		4 Months Ended	9 Months Ended
	Aug. 24, 2018 USD ($)	Aug. 24, 2018 BRL (R$)	May 31, 2018 USD ($) site	May 31, 2018 INR (₨) site	Mar. 31, 2018 USD ($) site	Mar. 31, 2018 INR (₨)	Nov. 17, 2017 USD ($)	Nov. 17, 2017 concrete_pole	Nov. 17, 2017 route_miles_of_fiber	Sep. 30, 2018 USD ($) site	Sep. 30, 2018 INR (₨)	Sep. 30, 2018 USD ($) site	Sep. 30, 2018 USD ($) site	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Revenue of acquiree since acquisition date										$ 81.5			$ 136.5
Business combination gross margin										27.4			47.7
Accounts payable										122.9		$ 122.9	122.9	$ 142.9
Vodafone
Business Acquisition [Line Items]
Purchase price					$ 587.9
Vodafone | Communication Sites
Business Acquisition [Line Items]
Number of communications sites acquired | site					10,200
Purchase price					$ 587.9	₨ 38.3
Accounts payable					$ 1.1
Other Acquisitions
Business Acquisition [Line Items]
Purchase price													259.2
Accounts payable										$ 7.8		$ 7.8	$ 7.8
Other Acquisitions | Communication Sites
Business Acquisition [Line Items]
Number of communications sites acquired | site										1,114		1,114	1,114
Purchase price													$ 259.2
Cemig Acquisition
Business Acquisition [Line Items]
Purchase price	$ 138.9	R$ 571.0
Idea Cellular Infrastructure Services Limited
Business Acquisition [Line Items]
Percentage of interests acquired			100.00%	100.00%
Number of communications sites acquired | site			9,700	9,700
Total consideration			$ 635.5									$ 625.9
Idea Cellular Infrastructure Services Limited | Communication Sites
Business Acquisition [Line Items]
Total consideration			$ 635.5	₨ 42.8						$ 625.9	₨ 42.2
Entities With Urban Telecommunications Assets In Mexico
Business Acquisition [Line Items]
Percentage of interests acquired							100.00%	100.00%	100.00%
Total consideration							$ 505.8						$ 499.7
Number of concrete poles (more than) and fiber acquired								50,000	2,100