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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of finite-lived intangible assets | There were no changes in the carrying amount of goodwill during the fiscal years ended December 31, 2022 and 2021, respectively.
|  |  | December 31, 2022 |  | December 31, 2021
| Weighted - Average Remaining Amortization Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
|  |  | (Dollars in millions)
Customer relationships | 2 |  | 6.7 |  |  | 5.6 |  |  | 1.1 |  |  | 6.7 |  |  | 5.0 |  |  | 1.7 |
Permits | 20 |  | 31.7 |  |  | 4.5 |  |  | 27.2 |  |  | 31.7 |  |  | 3.1 |  |  | 28.6 |
Other | 28 |  | 1.6 |  |  | 0.1 |  |  | 1.5 |  |  | 1.6 |  |  | 0.1 |  |  | 1.5 |
Total |  |  | $ | 40.0 |  |  | $ | 10.2 |  |  | $ | 29.8 |  |  | $ | 40.0 |  |  | $ | 8.2 |  |  | $ | 31.8 |
Schedule of finite-lived intangible assets, future amortization expense | Based on the carrying value of finite-lived intangible assets as of December 31, 2022, we estimate amortization expense for each of the next five years as follows:
| (Dollars in millions)
2023 | $ | 2.0 |
2024 | 1.9 |
2025 | 1.5 |
2026 | 1.5 |
2027 | 1.4 |
Thereafter | 21.5 |
Total | $ | 29.8 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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