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Acquisitions and Divestitures - Narrative (Details) $ in Millions		1 Months Ended	3 Months Ended				12 Months Ended
	Oct. 01, 2024 USD ($)	Jul. 31, 2024 USD ($)	Mar. 31, 2025 USD ($) businesses_divested numberOfBusinessesAcquired		Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Aug. 26, 2024 USD ($)
Segment Reporting Information [Line Items]
Contingent Consideration, Asset			$ 15.6
Revenues			632.0			$ 598.6
Total operating profit			55.8			53.4
Proceeds from sale of businesses			0.0			6.7
Goodwill			1,343.2	[1]			$ 1,361.2
Gain on sale of businesses			$ 0.3			7.0
Number of Divestitures | businesses_divested			0
Number of Acquisitions | numberOfBusinessesAcquired			0
Operating lease payments, present value			$ 62.0
Steel components
Segment Reporting Information [Line Items]
Gain on sale of businesses			0.3
Asphalt and other non-operating facility
Segment Reporting Information [Line Items]
Proceeds from sale of businesses							27.3
Term loan
Segment Reporting Information [Line Items]
Long-Term Debt, Gross	$ 700.0		700.0
Unsecured Debt | Senior Notes due 2032
Segment Reporting Information [Line Items]
Long-Term Debt, Gross			600.0				600.0	$ 600.0
Interest rate								6.875%
Construction Products
Segment Reporting Information [Line Items]
Goodwill			843.2				861.2
Engineered Structures
Segment Reporting Information [Line Items]
Goodwill			480.1				480.1
Transportation Products
Segment Reporting Information [Line Items]
Goodwill			19.9				19.9
Transportation Products | Steel components
Segment Reporting Information [Line Items]
Revenues						36.1
Total operating profit						$ 2.5
Proceeds from sale of businesses							55.0
Transportation Products | Steel components | Combined Proceeds
Segment Reporting Information [Line Items]
Proceeds from sale of businesses							110.0
Transportation Products | Steel components | Seller's Note
Segment Reporting Information [Line Items]
Proceeds from sale of businesses							25.0
Transportation Products | Steel components | Earnout Receivable
Segment Reporting Information [Line Items]
Proceeds from sale of businesses							30.0
Aggregates, Phoenix | Construction Products
Segment Reporting Information [Line Items]
Acquisition price		$ 35.0
Stavola
Segment Reporting Information [Line Items]
Operating Leases			12.5
Operating lease payments, present value			12.6
Stavola | Construction Products
Segment Reporting Information [Line Items]
Acquisition price	$ 1,200.0		1,192.0
Transaction Costs			0.7
Revenues			26.4
Total operating profit			(11.0)
Goodwill			333.6
Inventories			23.5
Receivables, net of allowance			69.2
Cash Acquired from Acquisition			$ 17.6
Stavola | Construction Products | Permits
Segment Reporting Information [Line Items]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life			20 years
Stavola | Construction Products | Use Rights
Segment Reporting Information [Line Items]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life			34 years
Stavola | Construction Products | Trade Names
Segment Reporting Information [Line Items]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life			5 years
Ameron | Engineered Structures
Segment Reporting Information [Line Items]
Acquisition price					$ 180.0
Goodwill							42.3
Inventories							18.1
Receivables, net of allowance							12.0
Ameron | Engineered Structures | Trademarks [Member]
Segment Reporting Information [Line Items]
Indefinite-lived intangibles							8.9
Ameron | Engineered Structures | Customer relationships
Segment Reporting Information [Line Items]
Finite-lived intangibles							25.6
Ameron | Engineered Structures | Technology
Segment Reporting Information [Line Items]
Finite-lived intangibles							$ 12.8
[1] (unaudited)

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