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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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