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Goodwill and Intangibles, Net (Tables) | 12 Months Ended
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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 |  | Spectrum |  | Total
Balance at December 31, 2020 |  | $ | 89.6 |  |  | $ | 21.4 |  |  | $ | 111.0 |
Acquisition |  | 16.7 |  |  | — |  |  | 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,
|  | 2022 |  | 2021
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 Life |  | 2022 |  | 2021
|  |  | Gross Carrying Amount | Accumulated Amortization | Net |  | Gross Carrying Amount | Accumulated Amortization | Net
Trade names |  | 14 years |  | $ | 25.4 |  |  | $ | (8.0) |  |  | $ | 17.4 |  |  | $ | 25.4 |  |  | $ | (6.3) |  |  | $ | 19.1 |
Customer relationships and contracts |  | 11 years |  | 87.6 |  |  | (35.4) |  |  | 52.2 |  |  | 87.7 |  |  | (21.6) |  |  | 66.1 |
Channel sharing arrangements |  | 35 years |  | 12.6 |  |  | (1.4) |  |  | 11.2 |  |  | 12.6 |  |  | (1.1) |  |  | 11.5 |
Other |  | 12 years |  | 4.1 |  |  | (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 |
2024 |  | 7.4 |
2025 |  | 7.3 |
2026 |  | 6.9 |
2027 |  | 4.7 |
Thereafter |  | 46.4 |
Total |  | $ | 83.8 |

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