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Goodwill and Intangibles, Net (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2023
$105.7 $21.4 $127.1 
Translation
(0.2)— (0.2)
Balance as of March 31, 2024
$105.5 $21.4 $126.9 
Schedule of Indefinite-Lived Intangible Assets
The carrying amounts of indefinite-lived intangible assets were as follows (in millions):
March 31,
2024		December 31, 2023
FCC licenses$106.3 $106.3 
Total$106.3 $106.3 
Schedule of Intangible Assets Subject to Amortization
The gross carrying amounts and accumulated amortization of definite lived intangible assets by major intangible asset class were as follows (in millions):
Weighted-Average Original Useful LifeMarch 31, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNetGross Carrying AmountAccumulated AmortizationNet
Trade names15 years$25.1 $(9.7)$15.4 $25.2 $(9.4)$15.8 
Customer relationships and contracts11 years87.5 (45.3)42.2 87.6 (44.2)43.4 
Channel sharing arrangements35 years12.6 (1.9)10.7 12.6 (1.8)10.8 
Other12 years3.9 (1.4)2.5 3.9 (1.3)2.6 
Total$129.1 $(58.3)$70.8 $129.3 $(56.7)$72.6