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Overview and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Accounting Policies [Abstract]
Contract asset with customer		$ 67.6		$ 65.5
Segment Reporting Information [Line Items]
Revenues		632.0	$ 598.6
Operating segments
Segment Reporting Information [Line Items]
Revenues		632.0	598.6
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Revenues		0.0	0.0
Construction Products | Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Revenues		(4.1)	(0.4)
Construction Products | Operating segments
Segment Reporting Information [Line Items]
Revenues		262.8	251.2
Engineered Structures | Operating segments
Segment Reporting Information [Line Items]
Revenues		284.8	231.6
Transportation Products | Operating segments
Segment Reporting Information [Line Items]
Revenues		84.4	115.8
Aggregates | Construction Products
Segment Reporting Information [Line Items]
Revenues		165.3	158.9
Specialty materials and asphalt | Construction Products
Segment Reporting Information [Line Items]
Revenues		73.2	63.2
Total Construction Materials | Construction Products
Segment Reporting Information [Line Items]
Revenues		234.4	221.7
Construction Site Support | Construction Products
Segment Reporting Information [Line Items]
Revenues		28.4	29.5
Utility, wind, and related structures | Engineered Structures
Segment Reporting Information [Line Items]
Revenues		284.8	231.6
Inland barges | Transportation Products
Segment Reporting Information [Line Items]
Revenues		84.4	79.7
Steel components | Transportation Products
Segment Reporting Information [Line Items]
Revenues	[1]	$ 0.0	$ 36.1
[1] On August 16, 2024, the Company completed the divestiture of its steel components business.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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