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GOVERNMENT GRANTS (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Universal Service Fund programs
Government Grants
Number of fund disbursement programs | item				4
Mobility Funds
Government Grants
Mobility Funds received		$ 21.1		$ 21.1
Mobility Funds | US Telecom
Government Grants
Grant funds used to offset fixed asset related costs		7.2		7.2
Grant funds used to offset operating expenses		13.9		13.9
High-Cost Support Program | HURRICANES IRMA AND MARIA | Grants
Government Grants
Revenue			$ 8.2		$ 8.2
High-Cost Support Program | US Telecom
Government Grants
Revenue		0.3	0.3	0.6	0.6
High-Cost Support Program | International Telecom
Government Grants
Revenue		4.1	4.1	8.2	8.2
E-Rate, Lifeline and Rural Health Care Support Programs
Government Grants
Revenue		1.6	$ 2.1	3.2	$ 4.3
E-Rate
Government Grants
Grant Funds Awarded				$ 15.4
Tribal Bidding Credit
Government Grants
Wireless service spectrum (in Mhz)				600
Revenue						$ 7.4
Grant funds used to offset fixed asset related costs		5.4		$ 5.4
Grant funds used to offset operating expenses		2.0		2.0
Connect America Fund Phase II Auction
Government Grants
Revenue		$ 1.5		$ 1.5
Grant Funds Awarded	$ 79.9
Grant fund term	10 years

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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