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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] | Intangible asset balances are as follows (in millions):
| June 30, 2024 |  | December 31, 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Backlog | $ | 54.6 |  |  | $ | 44.1 |  |  | $ | 10.5 |  |  | $ | 54.6 |  |  | $ | 41.6 |  |  | $ | 13.0 |
Customer relationships | 68.9 |  |  | 44.8 |  |  | 24.1 |  |  | 68.9 |  |  | 42.5 |  |  | 26.4 |
Total | $ | 123.5 |  |  | $ | 88.9 |  |  | $ | 34.6 |  |  | $ | 123.5 |  |  | $ | 84.1 |  |  | $ | 39.4 |

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