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Overview and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2025
Accounting Policies [Abstract] |
Disaggregation of Revenue | Revenues Total revenues for the Company's reportable segments are presented below:
| Three Months Ended March 31,
| 2025 |  | 2024
| (in millions)
Aggregates | $ | 165.3 |  |  | $ | 158.9 |
Specialty materials and asphalt | 73.2 |  |  | 63.2 |
Aggregates intrasegment sales | (4.1) |  |  | (0.4) |
Total Construction Materials | 234.4 |  |  | 221.7 |
Construction site support | 28.4 |  |  | 29.5 |
Construction Products | 262.8 |  |  | 251.2 |
Utility, wind, and related structures | 284.8 |  |  | 231.6 |
Engineered Structures | 284.8 |  |  | 231.6 |
Inland barges | 84.4 |  |  | 79.7 |
Steel components(1) | — |  |  | 36.1 |
Transportation Products | 84.4 |  |  | 115.8 |
Segment Totals before Eliminations | 632.0 |  |  | 598.6 |
Eliminations | — |  |  | — |
Consolidated Total | $ | 632.0 |  |  | $ | 598.6 |
(1) On August 16, 2024, the Company completed the divestiture of its steel components business.
Unsatisfied Performance Obligations | Unsatisfied Performance Obligations The following table includes estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially satisfied as of March 31, 2025:
| Unsatisfied performance obligations as of March 31, 2025 |  |
| Total Amount |  |  |  |
| (in millions) |  |  |  |
Engineered Structures: |  |  |  |  |
Utility, wind, and related structures | $ | 1,094.1 |  |  |  |  |
Transportation Products: |  |  |  |  |
Inland barges | $ | 333.6 |  |  |  |  |
Approximately 59% of the unsatisfied performance obligations for our utility, wind, and related structures in our Engineered Structures segment are expected to be delivered during 2025, approximately 15% are expected to be delivered during 2026, and the remainder are expected to be delivered through 2028. Approximately 63% of the unsatisfied performance obligations for inland barges in our Transportation Products segment are expected to be delivered during 2025, and the remainder are expected to be delivered in 2026.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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