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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Feb. 28, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Amortization of intangible assets		$ 0.2	$ 0.1	$ 0.5	$ 0.3
FCC spectrum licenses
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		$ (16.1)
Big sandy acquisition
Business Acquisition [Line Items]
Aggregate purchase price	$ 10.0
Property, plant and equipment acquired	4.6
Goodwill	2.6
Customer relationships \| Big sandy acquisition
Business Acquisition [Line Items]
Subscriber relationship acquired	$ 2.8