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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Contract asset with customer	$ 65.1	$ 65.5
Segment Reporting Information [Line Items]
Revenues	2,883.4	2,569.9	$ 2,307.9
Total
Segment Reporting Information [Line Items]
Revenues	2,883.4	2,570.0	2,308.3
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Revenues	0.0	(0.1)	(0.4)
Construction Products | Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(45.3)	(9.0)	(13.5)
Construction Products | Total
Segment Reporting Information [Line Items]
Revenues	1,310.2	1,105.1	1,001.3
Engineered Structures | Total
Segment Reporting Information [Line Items]
Revenues	1,189.9	1,047.3	873.5
Transportation Products | Total
Segment Reporting Information [Line Items]
Revenues	383.3	417.6	433.5
Aggregates | Construction Products
Segment Reporting Information [Line Items]
Revenues	761.5	678.6	619.7
Specialty materials and asphalt | Construction Products
Segment Reporting Information [Line Items]
Revenues	463.6	308.3	273.7
Total Construction Materials | Construction Products
Segment Reporting Information [Line Items]
Revenues	1,179.8	977.9	879.9
Construction site support [Member] | Construction Products
Segment Reporting Information [Line Items]
Revenues	130.4	127.2	121.4
Utility and related structures | Engineered Structures
Segment Reporting Information [Line Items]
Revenues	834.7	768.1	687.1
Wind towers | Engineered Structures
Segment Reporting Information [Line Items]
Revenues	355.2	279.2	186.4
Inland barges | Transportation Products
Segment Reporting Information [Line Items]
Revenues	383.3	329.8	280.2
Steel components | Transportation Products
Segment Reporting Information [Line Items]
Revenues	$ 0.0	$ 87.8	$ 153.3

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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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