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Intangible Assets | 9 Months Ended
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Sep. 30, 2023
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 September 30, 2023 and December 31, 2022, and other intangibles detailed in the table below, excluding fully amortized intangible assets.
|  |  | September 30, 2023 |  | December 31, 2022
| Weighted - Average Remaining Amortization Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
|  |  | (Dollars in millions)
Customer relationships | 1 |  | $ | 6.7 |  |  | $ | 6.0 |  |  | $ | 0.7 |  |  | $ | 6.7 |  |  | $ | 5.6 |  |  | $ | 1.1 |
Permits | 19 |  | 31.7 |  |  | 5.6 |  |  | 26.1 |  |  | 31.7 |  |  | 4.5 |  |  | 27.2 |
Other | 27 |  | 1.6 |  |  | 0.2 |  |  | 1.4 |  |  | 1.6 |  |  | 0.1 |  |  | 1.5 |
Total |  |  | $ | 40.0 |  |  | $ | 11.8 |  |  | $ | 28.2 |  |  | $ | 40.0 |  |  | $ | 10.2 |  |  | $ | 29.8 |
Total amortization expense for intangible assets subject to amortization was $0.5 million for both the three months ended September 30, 2023 and 2022, and $1.6 million and $1.5 million for the nine months ended September 30, 2023 and 2022, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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