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Goodwill and Intangibles, net (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of the Changes in the Carrying Amount of Goodwill by Reporting Unit | The carrying amount of goodwill by segment was as follows (in millions):
|  | Infrastructure |  | Spectrum |  | Total
Balance at December 31, 2020 |  | $ | 89.6 |  |  | $ | 21.4 |  |  | $ | 111.0 |
Acquisitions |  | 10.3 |  |  | — |  |  | 10.3 |
Translation |  | (0.2) |  |  | — |  |  | (0.2) |
Balance at June 30, 2021 |  | $ | 99.7 |  |  | $ | 21.4 |  |  | $ | 121.1 |
Schedule of Indefinite-Lived Intangible Assets | The carrying amount of indefinite-lived intangible assets was as follows (in millions):
|  | June 30, 2021 |  | December 31, 2020
FCC licenses |  | $ | 107.5 |  |  | $ | 113.0 |
Other |  | — |  |  | — |
Total |  | $ | 107.5 |  |  | $ | 113.0 |
Schedule of Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class were as follows (in millions):
|  | Weighted-Average Original Useful Life |  | June 30, 2021 |  | December 31, 2020
|  |  | Gross Carrying Amount | Accumulated Amortization | Net |  | Gross Carrying Amount | Accumulated Amortization | Net
Trade names |  | 14 years |  | $ | 25.4 |  |  | $ | (5.4) |  |  | $ | 20.0 |  |  | $ | 18.0 |  |  | $ | (4.6) |  |  | $ | 13.4 |
Customer relationships and contracts |  | 11 years |  | 85.4 |  |  | (14.5) |  |  | 70.9 |  |  | 36.4 |  |  | (12.1) |  |  | 24.3 |
Channel sharing arrangements |  | 35 years |  | 20.1 |  |  | (1.9) |  |  | 18.2 |  |  | 20.2 |  |  | (1.6) |  |  | 18.6 |
Other |  | 8 years |  | 8.4 |  |  | (3.0) |  |  | 5.4 |  |  | 5.5 |  |  | (2.7) |  |  | 2.8 |
Total |  |  |  | $ | 139.3 |  |  | $ | (24.8) |  |  | $ | 114.5 |  |  | $ | 80.1 |  |  | $ | (21.0) |  |  | $ | 59.1 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Excluding the impact of any future acquisitions, dispositions or change in foreign currency, the Company estimates the annual amortization expense of amortizable intangible assets for the next five fiscal years will be as follows (in millions):
|  | Estimated Amortization
2021 |  | $ | 7.8 |
2022 |  | 15.6 |
2023 |  | 11.1 |
2024 |  | 8.0 |
2025 |  | 7.3 |
Thereafter |  | 64.7 |
Total |  | $ | 114.5 |

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