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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill |
| Domestic Coke |  | Logistics |  | Total
| (Dollars in millions)
Net balances at December 31, 2018 | $ | 3.4 |  |  | $ | 73.5 |  |  | $ | 76.9 |
Impairment | — |  |  | (73.5) |  |  | (73.5) |
Net balances at December 31, 2019 and 2020 | $ | 3.4 |  |  | $ | — |  |  | $ | 3.4 |
Schedule of Finite-Lived Intangible Assets | The components of other intangible assets, net, excluding fully amortized intangible assets, were as follows:
|  |  | December 31, 2020 |  | December 31, 2019
| Weighted - Average Remaining Amortization Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
|  |  | (Dollars in millions)
Customer contracts | — |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7.7 |  |  | $ | 7.2 |  |  | $ | 0.5 |
Customer relationships | 4 |  | 6.7 |  |  | 4.5 |  |  | 2.2 |  |  | 6.7 |  |  | 3.9 |  |  | 2.8 |
Permits | 22 |  | 31.7 |  |  | 1.7 |  |  | 30.0 |  |  | 31.7 |  |  | 0.3 |  |  | 31.4 |
Other | 30 |  | 1.6 |  |  | — |  |  | 1.6 |  |  | — |  |  | — |  |  | — |
Total |  |  | $ | 40.0 |  |  | $ | 6.2 |  |  | $ | 33.8 |  |  | $ | 46.1 |  |  | $ | 11.4 |  |  | $ | 34.7 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Based on the carrying value of finite-lived intangible assets as of December 31, 2020, we estimate amortization expense for each of the next five years as follows:
| (Dollars in millions)
2021 | $ | 2.0 |
2022 | 2.0 |
2023 | 2.0 |
2024 | 1.9 |
2025 | 1.5 |
Thereafter | 24.4 |
Total | $ | 33.8 |

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