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Goodwill and Intangibles, Net (Tables)
 6 Months Ended
Jun. 30, 2025
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 as of December 31, 2024
$105.3 $21.4 $126.7 
Translation adjustments
0.2 — 0.2 
Balance as of June 30, 2025
$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):
June 30,
2025		December 31, 2024
Federal Communications Commission ("FCC") licenses
$107.7 $107.7 
Total$107.7 $107.7 
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 LifeJune 30, 2025
Gross Carrying AmountAccumulated AmortizationNet
Trade names15 years$25.1 $(11.8)$13.3 
Customer relationships and contracts11 years87.5 (51.7)35.8 
Channel sharing arrangements35 years12.6 (2.3)10.3 
Other10 years3.7 (2.2)1.5 
Total$128.9 $(68.0)$60.9 

Weighted-Average Original Useful LifeDecember 31, 2024
Gross Carrying AmountAccumulated AmortizationNet
Trade names15 years$25.1 $(11.0)$14.1 
Customer relationships and contracts11 years87.4 (49.1)38.3 
Channel sharing arrangements35 years12.6 (2.2)10.4 
Other10 years3.9 (2.0)1.9 
Total$129.0 $(64.3)$64.7