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Goodwill and Intangibles, Net (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of the Changes in the Carrying Amount of Goodwill by Reporting Unit
The carrying amounts of goodwill by segment were as follows (in millions):
 
Infrastructure
SpectrumTotal
Balance at December 31, 2020$89.6 $21.4 $111.0 
Acquisition16.7 — 16.7 
Translation(0.3)— (0.3)
Balance at December 31, 2021$106.0 $21.4 $127.4 
Translation(0.3)— (0.3)
Balance as of December 31, 2022$105.7 $21.4 $127.1 
Schedule of Indefinite-Lived Intangible Assets
The carrying amounts of indefinite-lived intangible assets as of the periods indicated were as follows (in millions):
December 31,
20222021
FCC licenses$106.3 $106.5 
Total$106.3 $106.5 
Schedule of Intangible Assets Subject to Amortization
The gross carrying amounts and accumulated amortization of definite lived intangible assets by major intangible asset class as of the periods indicated were as follows (in millions):
December 31,
Weighted-Average Original Useful Life20222021
Gross Carrying AmountAccumulated AmortizationNetGross Carrying AmountAccumulated AmortizationNet
Trade names14 years$25.4 $(8.0)$17.4 $25.4 $(6.3)$19.1 
Customer relationships and contracts11 years87.6 (35.4)52.2 87.7 (21.6)66.1 
Channel sharing arrangements35 years12.6 (1.4)11.2 12.6 (1.1)11.5 
Other12 years4.1 (1.1)3.0 8.5 (3.3)5.2 
Total$129.7 $(45.9)$83.8 $134.2 $(32.3)$101.9 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Future estimated annual amortization expense for intangible assets as of December 31, 2022 is as follows (in millions):
Estimated Amortization
2023$11.1 
20247.4 
20257.3 
20266.9 
20274.7 
Thereafter46.4 
Total$83.8