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Goodwill and Intangibles, Net | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles, Net | 8. Goodwill and Intangibles, Net Goodwill The carrying amounts of goodwill by segment were as follows (in millions):
|  | Infrastructure |  | Spectrum |  | Total
Balance as of December 31, 2024 |  | $ | 105.3 |  |  | $ | 21.4 |  |  | $ | 126.7 |
Translation adjustments |  | 0.2 |  |  | — |  |  | 0.2 |
Balance as of September 30, 2025 |  | $ | 105.5 |  |  | $ | 21.4 |  |  | $ | 126.9 |
Indefinite-lived Intangible Assets The carrying amounts of indefinite-lived intangible assets were as follows (in millions):
|  | September 30, 2025 |  | December 31, 2024
Federal Communications Commission ("FCC") licenses |  | $ | 107.9 |  |  | $ | 107.7 |
Total |  | $ | 107.9 |  |  | $ | 107.7 |
Definite-lived Intangible Assets 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 Life |  | September 30, 2025
|  |  | Gross Carrying Amount | Accumulated Amortization | Net
Trade names |  | 15 years |  | $ | 25.1 |  |  | $ | (12.2) |  |  | $ | 12.9 |
Customer relationships and contracts |  | 11 years |  | 87.5 |  |  | (53.0) |  |  | 34.5 |
Channel sharing arrangements |  | 35 years |  | 12.6 |  |  | (2.4) |  |  | 10.2 |
Other |  | 10 years |  | 3.7 |  |  | (2.2) |  |  | 1.5 |
Total |  |  |  | $ | 128.9 |  |  | $ | (69.8) |  |  | $ | 59.1 |
|  | Weighted-Average Original Useful Life |  | December 31, 2024
|  |  | Gross Carrying Amount | Accumulated Amortization | Net
Trade names |  | 15 years |  | $ | 25.1 |  |  | $ | (11.0) |  |  | $ | 14.1 |
Customer relationships and contracts |  | 11 years |  | 87.4 |  |  | (49.1) |  |  | 38.3 |
Channel sharing arrangements |  | 35 years |  | 12.6 |  |  | (2.2) |  |  | 10.4 |
Other |  | 10 years |  | 3.9 |  |  | (2.0) |  |  | 1.9 |
Total |  |  |  | $ | 129.0 |  |  | $ | (64.3) |  |  | $ | 64.7 |
Amortization expense for definite-lived intangible assets was $1.8 million and $2.0 million for the three months ended September 30, 2025 and 2024, respectively. Amortization expense for definite-lived intangible assets was $5.7 million and $5.8 million for the nine months ended September 30, 2025 and 2024, respectively. Amortization expense is included in Depreciation and amortization in the Condensed Consolidated Statements of Operations.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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