Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Sep. 07, 2021
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	$ 964.4	$ 963.0	$ 963.0
Accumulated amortization	(71.5)	(41.4)
Intangible assets subject to amortization, net amount	892.9	921.6
Intangible assets not subject to amortization			$ 6.6
Total intangible assets, gross carrying amount	971.1	969.7
Intangible assets, net amount	899.6	928.3
FCC Licenses and Spectrum Usage Rights [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	6.7	6.7
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	851.1	850.0
Accumulated amortization	(62.2)	(36.2)
Intangible assets subject to amortization, net amount	788.9	813.8
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	108.3	108.0
Accumulated amortization	(8.9)	(5.0)
Intangible assets subject to amortization, net amount	99.4	103.0
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	5.0	5.0
Accumulated amortization	(0.4)	(0.2)
Intangible assets subject to amortization, net amount	$ 4.6	$ 4.8