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Goodwill and Intangibles, net (Tables) | 6 Months Ended
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Jun. 30, 2019
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 were as follows (in millions):
| Construction | Marine Services |  | Energy |  | Telecom |  | Insurance | Broadcasting | Total
Balance at December 31, 2018 |  | $ | 82.2 |  |  | $ | 14.3 |  |  | $ | 2.1 |  |  | $ | 4.4 |  |  | $ | 47.3 |  |  | $ | 21.4 |  |  | $ | 171.7 |
Measurement period adjustment |  | 7.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.1 |
Impairments |  | — |  |  | — |  |  | — |  |  | (0.4 | ) |  | — |  |  | — |  |  | (0.4 | )
Balance at June 30, 2019 |  | $ | 89.3 |  |  | $ | 14.3 |  |  | $ | 2.1 |  |  | $ | 4.0 |  |  | $ | 47.3 |  |  | $ | 21.4 |  |  | $ | 178.4 |
Schedule of Indefinite-Lived Intangible Assets | Balances of indefinite-lived intangible assets as of June 30, 2019 and December 31, 2018 were as follows (in millions):
|  | June 30, 2019 |  | December 31, 2018
FCC licenses |  | $ | 132.6 |  |  | $ | 120.6 |
State licenses |  | 2.5 |  |  | 2.5 |
Total |  | $ | 135.1 |  |  | $ | 123.1 |
Schedule of Intangible Assets Subject to Amortization | The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class is as follows (in millions):
|  | Weighted-Average Original Useful Life |  | June 30, 2019 |  | December 31, 2018
|  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trade names |  | 13 Years |  | $ | 26.0 |  |  | $ | (7.0 | ) |  | $ | 19.0 |  |  | $ | 25.9 |  |  | $ | (5.9 | ) |  | $ | 20.0 |
Customer relationships |  | 10 Years |  | 53.6 |  |  | (11.5 | ) |  | 42.1 |  |  | 53.6 |  |  | (7.2 | ) |  | 46.4 |
Channel sharing arrangements |  | 40 Years |  | 25.2 |  |  | (0.5 | ) |  | 24.7 |  |  | 25.2 |  |  | — |  |  | 25.2 |
Developed technology |  | 5 Years |  | 1.2 |  |  | (1.2 | ) |  | — |  |  | 1.2 |  |  | (1.2 | ) |  | — |
Other |  | 6 Years |  | 5.5 |  |  | (1.5 | ) |  | 4.0 |  |  | 5.5 |  |  | (1.0 | ) |  | 4.5 |
Total |  |  |  | $ | 111.5 |  |  | $ | (21.7 | ) |  | $ | 89.8 |  |  | $ | 111.4 |  |  | $ | (15.3 | ) |  | $ | 96.1 |
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):
Fiscal Year |  | Estimated Amortization Expense
2019 |  | $ | 5.5 |
2020 |  | $ | 8.1 |
2021 |  | $ | 7.9 |
2022 |  | $ | 7.7 |
2023 |  | $ | 6.9 |

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