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Overview and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
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,
 20252024
 (in millions)
Aggregates$165.3 $158.9 
Specialty materials and asphalt73.2 63.2 
Aggregates intrasegment sales(4.1)(0.4)
Total Construction Materials234.4 221.7 
Construction site support28.4 29.5 
Construction Products262.8 251.2 
Utility, wind, and related structures284.8 231.6 
Engineered Structures284.8 231.6 
Inland barges84.4 79.7 
Steel components(1)
— 36.1 
Transportation Products84.4 115.8 
Segment Totals before Eliminations632.0 598.6 
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.