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Acquisitions and Divestitures - Narrative (Details) $ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 01, 2024 USD ($)	Aug. 26, 2024 USD ($)	Jul. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) businesses_divested	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Debt issuance costs						$ 23.3	$ 2.0	$ 0.0
Contingent Consideration, Asset				$ 15.4		15.4
Operating leases				12.6		36.7	7.7
Purchase price						1,424.2	119.4	75.6
Goodwill recorded						397.1	40.4	11.6
Revenues						2,569.9	2,307.9	2,242.8
Operating profit (loss)						197.6	217.3	349.0
Acquisition holdback									$ 15.0
Proceeds from sale of businesses						86.6	2.0	271.6
Goodwill				1,361.2		1,361.2	990.7
(Gain) loss on sale of businesses						2.1	(6.4)	(189.0)
Difference between holdback settlement and amount accrued at acquisition							$ 5.0
Number of Divestitures | businesses_divested							0
Holdback payment from acquisition						0.0	$ (10.0)	0.0
Storage tanks
Segment Reporting Information [Line Items]
(Gain) loss on sale of businesses						(6.9)	(6.4)
Steel components
Segment Reporting Information [Line Items]
(Gain) loss on sale of businesses						(21.6)
Asphalt and other non-operating facility
Segment Reporting Information [Line Items]
Selling price of business						27.3
(Gain) loss on sale of businesses						(12.5)
Revolving credit facility | Revolving credit facility
Segment Reporting Information [Line Items]
Debt issuance costs						1.9
Repayments of lines of credit	$ 100.0							155.0
Borrowings from revolving credit facility					$ 160.0	335.0	60.0	80.0
Term Loan
Segment Reporting Information [Line Items]
Long-term debt, gross	700.0			700.0		700.0	0.0
Term Loan | Revolving credit facility
Segment Reporting Information [Line Items]
Debt issuance costs						7.0
Senior Notes due 2032
Segment Reporting Information [Line Items]
Debt issuance costs		$ 8.2
Unsecured Debt | Senior Notes due 2032
Segment Reporting Information [Line Items]
Long-term debt, gross		$ 600.0		600.0		600.0	0.0
Interest rate		6.875%
Construction Products
Segment Reporting Information [Line Items]
Goodwill				861.2		861.2	516.1
Engineered Structures
Segment Reporting Information [Line Items]
Goodwill				480.1		480.1	437.6
Engineered Structures | Storage tanks
Segment Reporting Information [Line Items]
Revenues						0.0	0.0	188.9
Operating profit (loss)								41.1
Engineered Structures | Storage tanks
Segment Reporting Information [Line Items]
Selling price of business								275.0
Transportation Products
Segment Reporting Information [Line Items]
Goodwill				19.9		19.9	37.0
Transportation Products | Steel components
Segment Reporting Information [Line Items]
Revenues						87.8	153.3	127.4
Operating profit (loss)						(19.5)	11.0	0.9
Selling price of business						55.0
Transportation Products | Steel components | Combined Proceeds
Segment Reporting Information [Line Items]
Selling price of business						110.0
Transportation Products | Steel components | Seller's Note
Segment Reporting Information [Line Items]
Selling price of business						25.0
Transportation Products | Steel components | Earnout Receivable
Segment Reporting Information [Line Items]
Selling price of business						30.0
RAMCO | Construction Products
Segment Reporting Information [Line Items]
Purchase price								$ 77.4
Goodwill recorded							13.4
Property, plant, and equipment, including mineral reserves							6.4
RAMCO | Construction Products | Permits
Segment Reporting Information [Line Items]
Useful life of acquired intangible asset								20 years
Intangible asset							54.2
Lake Point | Construction Products
Segment Reporting Information [Line Items]
Purchase price							$ 65.1
Goodwill recorded						15.6
Mineral Reserves				19.1		19.1
Property, plant, and equipment, including mineral reserves				13.3		13.3
Lake Point | Construction Products | Permits
Segment Reporting Information [Line Items]
Intangible asset				11.5		11.5
Stavola | Construction Products
Segment Reporting Information [Line Items]
Business Acquisition, Transaction Costs				25.5		25.5
Purchase price	$ 1,200.0					1,209.6
Property, plant, and equipment, including mineral reserves				743.0		743.0
Revenues						78.2
Operating profit (loss)						4.5
Goodwill				351.5		351.5
Inventories				23.2		23.2
Receivables, net of allowance				69.1		$ 69.1
Stavola | Construction Products | Permits
Segment Reporting Information [Line Items]
Useful life of acquired intangible asset						20 years
Stavola | Construction Products | Beneficial use rights
Segment Reporting Information [Line Items]
Useful life of acquired intangible asset						34 years
Stavola | Construction Products | Trade names
Segment Reporting Information [Line Items]
Useful life of acquired intangible asset						5 years
Ameron | Engineered Structures
Segment Reporting Information [Line Items]
Purchase price					$ 180.0
Property, plant, and equipment, including mineral reserves				60.8		$ 60.8
Intangible asset				12.8		12.8
Goodwill				42.3		42.3
Inventories				18.1		18.1
Receivables, net of allowance				12.0		12.0
Ameron | Engineered Structures | Trademarks
Segment Reporting Information [Line Items]
Trademarks				8.9		8.9
Ameron | Engineered Structures | Customer relationships
Segment Reporting Information [Line Items]
Intangible asset				$ 25.6		$ 25.6
Aggregates, Phoenix | Construction Products
Segment Reporting Information [Line Items]
Purchase price			$ 35.0

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