Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	$ 568.5	$ 568.5
Accumulated amortization	(242.6)	(229.3)
Intangible assets subject to amortization, net amount	325.9	339.2
Total intangible assets, gross carrying amount	582.7	582.7
Intangible assets, net amount	340.1	353.4
FCC Licenses and Spectrum Usage Rights [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	7.4	7.4
Perpetual Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	6.8	6.8
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	545.0	545.0
Accumulated amortization	(221.4)	(208.2)
Intangible assets subject to amortization, net amount	323.6	336.8
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	22.4	22.4
Accumulated amortization	(20.7)	(20.6)
Intangible assets subject to amortization, net amount	1.7	1.8
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross carrying amount	1.1	1.1
Accumulated amortization	(0.5)	(0.5)
Intangible assets subject to amortization, net amount	$ 0.6	$ 0.6