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Goodwill and Intangibles, net | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles, net | 8. Goodwill and Intangibles, net Goodwill 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 |
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 |
For the six months ended June 30, 2021, FCC licenses decreased $5.5 million predominately related to the reclassification to held-for-sale as a result of our Spectrum segment entering into certain agreements to sell non-core FCC licenses. Definite Lived Intangible Assets 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 |
Amortization expense for definite lived intangible assets was $2.3 million and $1.5 million for the three months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations. Amortization expense for definite lived intangible assets was $3.8 million and $3.0 million for the six months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations. Amortization 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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