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Intangible Assets | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 3. 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 |
Total amortization expense for intangible assets subject to amortization was $0.4 million and $0.5 million for the three months ended June 30, 2025 and 2024, respectively, and $0.7 million and $1.0 million for the six months ended June 30, 2025 and 2024, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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