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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both June 30, 2025 and December 31, 2024, and other intangibles detailed in the table below, excluding fully amortized intangible assets.
|  |  | June 30, 2025 |  | December 31, 2024
| Weighted - Average Remaining Amortization Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
|  |  | (Dollars in millions)
Permits | 17 |  | 31.7 |  |  | 7.9 |  |  | 23.8 |  |  | 31.7 |  |  | 7.3 |  |  | 24.4 |
Other | 25 |  | 1.6 |  |  | 0.3 |  |  | 1.3 |  |  | 1.6 |  |  | 0.2 |  |  | 1.4 |
Total |  |  | $ | 33.3 |  |  | $ | 8.2 |  |  | $ | 25.1 |  |  | $ | 33.3 |  |  | $ | 7.5 |  |  | $ | 25.8 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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