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Business Combinations, Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Business Combinations Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents the changes in the carrying value of our goodwill (in millions of dollars):
|  | As of December 31, |
|  | 2023 |  |  | 2022 |
Gross carrying value 1: |  |  |  |  |  |
Beginning balance |  | $ | 57.7 |  |  | $ | 57.7 |
Warrick impairment |  |  | — |  |  |  | (20.5 | )
Ending balance |  |  | 57.7 |  |  |  | 37.2 |
Accumulated impairment loss 1 |  |  | (38.9 | ) |  |  | (18.4 | )
Net carrying value |  | $ | 18.8 |  |  | $ | 18.8 |
1. The gross carrying value and accumulated impairment loss excludes $25.2 million of goodwill recorded in conjunction with our acquisition of IMT.
Schedule of Gross Carrying Amount and Accumulated Amortization By Major Intangible Asset Class | The following table presents the gross carrying amount and accumulated amortization by major intangible asset class (in millions of dollars, except amortization periods):
|  | Weighted- Average Amortization Period (in years) |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |
As of December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  | 19 |  |  | $ | 68.1 |  |  | $ | (26.1 | ) |  | $ | 42.0 |
Trade name |  |  | 10 |  |  |  | 2.4 |  |  |  | (1.2 | ) |  |  | 1.2 |
Non-compete agreement |  |  | 5 |  |  |  | 5.4 |  |  |  | (5.4 | ) |  |  | — |
Favorable lease contracts |  |  | 120 |  |  |  | 7.0 |  |  |  | (0.2 | ) |  |  | 6.8 |
Total |  |  |  |  | $ | 82.9 |  |  | $ | (32.9 | ) |  | $ | 50.0 |
As of December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  | 19 |  |  | $ | 68.1 |  |  | $ | (21.9 | ) |  | $ | 46.2 |
Trade name |  |  | 10 |  |  |  | 2.4 |  |  |  | (1.0 | ) |  |  | 1.4 |
Non-compete agreement |  |  | 5 |  |  |  | 5.4 |  |  |  | (4.6 | ) |  |  | 0.8 |
Favorable lease contracts |  |  | 120 |  |  |  | 7.0 |  |  |  | (0.1 | ) |  |  | 6.9 |
Total |  |  |  |  | $ | 82.9 |  |  | $ | (27.6 | ) |  | $ | 55.3 |
Schedule of Expected Amortization of Intangible Assets | The following table presents the expected amortization of intangible assets for each of the next five calendar years and thereafter as of December 31, 2023 (in millions of dollars):
2024 |  | $ | 4.5 |
2025 |  |  | 4.5 |
2026 |  |  | 4.5 |
2027 |  |  | 4.5 |
2028 |  |  | 4.4 |
Thereafter |  |  | 27.6 |
Total |  | $ | 50.0 |

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