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Acquisitions and Divestitures - Narrative (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 24, 2026 USD ($) | Oct. 01, 2024 USD ($) | Aug. 26, 2024 USD ($) | Jul. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2025 USD ($) numberOfBusinessesAcquired businesses_divested | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) businesses_divested | Dec. 31, 2021 USD ($) | Jun. 17, 2025 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 0.8 | $ 23.3 | $ 2.0 |  |
Contingent Consideration, Asset |  |  |  |  |  | 2.2 |  |  |  |
Purchase price |  |  |  |  |  | (17.6) | 1,424.2 | 119.4 |  |
Goodwill recorded, net |  |  |  |  |  | (12.3) | 397.1 | 40.4 |  |
Revenues |  |  |  |  |  | 2,883.4 | 2,569.9 | 2,307.9 |  |
Operating profit (loss) |  |  |  |  |  | 341.9 | 197.6 | 217.3 |  |
Acquisition holdback |  |  |  |  |  |  |  |  | $ 15.0 |
Goodwill |  |  |  |  |  | 1,348.9 | 1,361.2 |  |  |
(Gain) loss on sale of businesses |  |  |  |  |  | $ 14.7 |  |  |  |
Difference between holdback settlement and amount accrued at acquisition |  |  |  |  |  |  |  | $ 5.0 |  |
Number of Divestitures | businesses_divested |  |  |  |  |  | 0 |  | 0 |  |
Holdback payment from acquisition |  |  |  |  |  | $ 0.0 | 0.0 | $ (10.0) |  |
Number of Acquisitions | numberOfBusinessesAcquired |  |  |  |  |  | 0 |  |  |  |
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 |  |  |
Borrowings under revolving credit facility |  |  |  |  | $ 160.0 |  |  | 60.0 |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  | $ 700.0 |  |  |  | $ 536.5 | 700.0 |  |  | $ 698.3
Term Loan | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | 0.8 | 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 |  |  |
Interest rate |  |  | 6.875% |  |  |  |  |  |  |
Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 848.8 | 861.2 |  |  |
Engineered Structures |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 480.2 | 480.1 |  |  |
Transportation Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 19.9 | 19.9 |  |  |
Transportation Products | Steel components |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 87.8 | 153.3 |  |
Operating profit (loss) |  |  |  |  |  |  | (19.5) | 11.0 |  |
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 |  |  |
Transportation Products | Inland barges |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 383.3 | 329.8 |  |  |
Operating profit (loss) |  |  |  |  |  | 60.8 | 49.7 |  |  |
Transportation Products | Inland barges | Subsequent Event |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Selling price of business | $ 450.0 |  |  |  |  |  |  |  |  |
Lake Point | Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 65.1 |  |
Goodwill recorded, net |  |  |  |  |  |  | 15.6 |  |  |
Mineral Reserves |  |  |  |  |  |  | 19.1 |  |  |
Property, plant, and equipment, including mineral reserves |  |  |  |  |  |  | 13.3 |  |  |
Lake Point | Construction Products | Permits |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset |  |  |  |  |  |  | 11.5 |  |  |
Stavola |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 78.2 |  |  |
Operating profit (loss) |  |  |  |  |  |  | 4.5 |  |  |
Stavola | Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  | 25.5 |  |  |
Purchase price |  | $ 1,200.0 |  |  |  | 1,192.0 |  |  |  |
Property, plant, and equipment, including mineral reserves |  |  |  |  |  | 742.6 |  |  |  |
Goodwill |  |  |  |  |  | 339.3 |  |  |  |
Inventories |  |  |  |  |  | 23.5 |  |  |  |
Receivables, net of allowance |  |  |  |  |  | 69.2 |  |  |  |
Cash Acquired from Acquisition |  |  |  |  |  | $ 17.6 |  |  |  |
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 |  |  |
Intangible asset |  |  |  |  |  |  | 12.8 |  |  |
Goodwill |  |  |  |  |  |  | 42.3 |  |  |
Inventories |  |  |  |  |  |  | 18.1 |  |  |
Receivables, net of allowance |  |  |  |  |  |  | 12.0 |  |  |
Ameron | Engineered Structures | Trademarks |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  |  |  |  | 8.9 |  |  |
Ameron | Engineered Structures | Customer relationships |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset |  |  |  |  |  |  | $ 25.6 |  |  |
Aggregates, Phoenix | Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 35.0 |  |  |  |  |  |

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