OTHER OPERATING EXPENSES (Imairment Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of intangible asset impairment [Line Items]
Impairment charges	$ 94.2	$ 394.0	$ 211.4
Tower and network location intangible assets
Schedule of intangible asset impairment [Line Items]
Impairment charges	77.4	284.9	108.7
Tenant relationships
Schedule of intangible asset impairment [Line Items]
Impairment charges	0.0	107.3	100.1
Other
Schedule of intangible asset impairment [Line Items]
Impairment charges	$ 16.8	1.8	2.6
Tata Teleservices | Tower and network location intangible assets
Schedule of intangible asset impairment [Line Items]
Impairment charges		258.3
Aircel, Asia | Tenant relationships
Schedule of intangible asset impairment [Line Items]
Impairment charges		$ 107.3
Property | Asia | Tower and network location intangible assets
Schedule of intangible asset impairment [Line Items]
Impairment charges			$ 81.0