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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2025 |  | December 31, 2024
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Backlog | $ | 54.6 |  |  | $ | 49.3 |  |  | $ | 5.3 |  |  | $ | 54.6 |  |  | $ | 46.8 |  |  | $ | 7.8 |
Customer relationships | 68.9 |  |  | 50.5 |  |  | 18.4 |  |  | 68.9 |  |  | 47.1 |  |  | 21.8 |
Total | $ | 123.5 |  |  | $ | 99.8 |  |  | $ | 23.7 |  |  | $ | 123.5 |  |  | $ | 93.9 |  |  | $ | 29.6 |

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