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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Contract asset with customer	$ 65.5	$ 66.8
Segment Reporting Information [Line Items]
Revenues	2,569.9	2,307.9	$ 2,242.8
Total
Segment Reporting Information [Line Items]
Revenues	2,570.0	2,308.3	2,242.8
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Revenues	0.1	0.4	0.0
Construction Products | Total
Segment Reporting Information [Line Items]
Revenues	1,105.1	1,001.3	923.5
Engineered Structures | Total
Segment Reporting Information [Line Items]
Revenues	1,047.3	873.5	1,002.0
Transportation Products | Total
Segment Reporting Information [Line Items]
Revenues	417.6	433.5	317.3
Aggregates and specialty materials | Construction Products
Segment Reporting Information [Line Items]
Revenues	977.9	879.9	821.4
Construction site support [Member] | Construction Products
Segment Reporting Information [Line Items]
Revenues	127.2	121.4	102.1
Utility, wind, and related structures | Engineered Structures
Segment Reporting Information [Line Items]
Revenues	1,047.3	873.5	813.1
Storage tanks | Engineered Structures
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	188.9
Inland barges | Transportation Products
Segment Reporting Information [Line Items]
Revenues	329.8	280.2	189.9
Steel components | Transportation Products
Segment Reporting Information [Line Items]
Revenues	$ 87.8	$ 153.3	$ 127.4

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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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