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Intangible Assets (Tables) | 9 Months Ended
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Sep. 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):
| September 30, 2024 |  | December 31, 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Backlog | $ | 54.6 |  |  | $ | 45.4 |  |  | $ | 9.2 |  |  | $ | 54.6 |  |  | $ | 41.6 |  |  | $ | 13.0 |
Customer relationships | 68.9 |  |  | 45.9 |  |  | 23.0 |  |  | 68.9 |  |  | 42.5 |  |  | 26.4 |
Total | $ | 123.5 |  |  | $ | 91.3 |  |  | $ | 32.2 |  |  | $ | 123.5 |  |  | $ | 84.1 |  |  | $ | 39.4 |

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