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Goodwill and Intangibles, Net | 3 Months Ended
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Mar. 31, 2024
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 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 |
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 |
There were no impairment charges recorded to definite lived intangible assets for the three months ended March 31, 2024 and 2023. 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 |  | March 31, 2024 |  | December 31, 2023
|  |  | Gross Carrying Amount | Accumulated Amortization | Net |  | Gross Carrying Amount | Accumulated Amortization | Net
Trade names |  | 15 years |  | $ | 25.1 |  |  | $ | (9.7) |  |  | $ | 15.4 |  |  | $ | 25.2 |  |  | $ | (9.4) |  |  | $ | 15.8 |
Customer relationships and contracts |  | 11 years |  | 87.5 |  |  | (45.3) |  |  | 42.2 |  |  | 87.6 |  |  | (44.2) |  |  | 43.4 |
Channel sharing arrangements |  | 35 years |  | 12.6 |  |  | (1.9) |  |  | 10.7 |  |  | 12.6 |  |  | (1.8) |  |  | 10.8 |
Other |  | 12 years |  | 3.9 |  |  | (1.4) |  |  | 2.5 |  |  | 3.9 |  |  | (1.3) |  |  | 2.6 |
Total |  |  |  | $ | 129.1 |  |  | $ | (58.3) |  |  | $ | 70.8 |  |  | $ | 129.3 |  |  | $ | (56.7) |  |  | $ | 72.6 |
There were no impairment charges recorded to definite lived intangible assets for the three months ended March 31, 2024 and 2023. Amortization expense for definite lived intangible assets was $1.9 million and $3.9 million for the three months ended March 31, 2024 and 2023, respectively, and was 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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