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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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