Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	$ 963.0	$ 193.2
Accumulated amortization	(41.4)	(51.5)
Intangible assets subject to amortization, net amount	921.6	141.7
Intangible assets not subject to amortization	6.6
Intangible assets, gross carrying amount	969.7	199.6
Intangible assets, net amount	928.3	148.1
FCC Licenses and Spectrum Usage Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	6.7	6.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	850.0	141.6
Accumulated amortization	(36.2)	(38.9)
Intangible assets subject to amortization, net amount	813.8	102.7
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	108.0	41.7
Accumulated amortization	(5.0)	(9.4)
Intangible assets subject to amortization, net amount	103.0	32.3
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	5.0	9.9
Accumulated amortization	(0.2)	(3.2)
Intangible assets subject to amortization, net amount	$ 4.8	$ 6.7