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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible asset balances are as follows (in millions):
| December 31, 2024 |  | December 31, 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Backlog | $ | 54.6 |  |  | $ | 46.8 |  |  | $ | 7.8 |  |  | $ | 54.6 |  |  | $ | 41.6 |  |  | $ | 13.0 |
Customer relationships | 68.9 |  |  | 47.1 |  |  | 21.8 |  |  | 68.9 |  |  | 42.5 |  |  | 26.4 |
Total | $ | 123.5 |  |  | $ | 93.9 |  |  | $ | 29.6 |  |  | $ | 123.5 |  |  | $ | 84.1 |  |  | $ | 39.4 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):
2025 | $ | 8.4 |
2026 | 7.2 |
2027 | 6.0 |
2028 | 4.6 |
2029 | 3.4 |
Thereafter | — |
Total | $ | 29.6 |

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- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + Details
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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://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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