Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Nov. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Amortization expense		$ 0.2	$ 0.2		$ 0.6	$ 0.6
FCC Spectrum licenses
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired		12.1		$ 16.1
FCC Spectrum licenses | Subsequent Event
Finite-Lived Intangible Assets [Line Items]
Assets refund	$ 4.0
Beam Fixed Wireless Network | Discontinued Operations, Held-for-sale
Finite-Lived Intangible Assets [Line Items]
Discontinued operation, indefinite-lived intangible assets		13.8			13.8
Discontinued operation, finite-lived intangible assets		5.9			5.9
Discontinued operation, finite-lived intangible assets, liabilities incurred		$ 3.8			$ 3.8