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Acquisitions and Divestitures - Purchase price allocation (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2024 | Jun. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 1,348.9 | $ 1,361.2 |  |
Purchase price |  |  | (17.6) | 1,424.2 | $ 119.4 |
Goodwill recorded, net |  |  | (12.3) | 397.1 | 40.4 |
Acquisition holdback |  |  |  |  |  | $ 15.0
Construction Products |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  | 848.8 | 861.2 |  |
Engineered Structures |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  | 480.2 | 480.1 |  |
Stavola | Construction Products |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Cash |  |  | 0.7 |  |  |
Receivables, net of allowance |  |  | 69.2 |  |  |
Inventories |  |  | 23.5 |  |  |
Other current assets |  |  | 2.6 |  |  |
Property, plant, and equipment, including mineral reserves |  |  | 742.6 |  |  |
Goodwill |  |  | 339.3 |  |  |
Intangibles |  |  | 40.4 |  |  |
Other assets |  |  | 23.2 |  |  |
Accounts payable |  |  | (18.0) |  |  |
Accrued liabilities |  |  | (2.6) |  |  |
Advance billings |  |  | (0.8) |  |  |
Other liabilities |  |  | (28.1) |  |  |
Purchase price | $ 1,200.0 |  | $ 1,192.0 |  |  |
Stavola | Construction Products | Beneficial use rights |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Useful life of acquired intangible asset |  |  | 34 years |  |  |
Stavola | Construction Products | Permits |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Useful life of acquired intangible asset |  |  | 20 years |  |  |
Stavola | Construction Products | Trade names |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Useful life of acquired intangible asset |  |  | 5 years |  |  |
Ameron | Engineered Structures |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Receivables, net of allowance |  |  |  | 12.0 |  |
Inventories |  |  |  | 18.1 |  |
Property, plant, and equipment, including mineral reserves |  |  |  | 60.8 |  |
Goodwill |  |  |  | 42.3 |  |
Intangible asset |  |  |  | 12.8 |  |
Purchase price |  | $ 180.0 |  |  |  |
Ameron | Engineered Structures | Trademarks |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Trademarks |  |  |  | 8.9 |  |
Ameron | Engineered Structures | Customer relationships |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Intangible asset |  |  |  | 25.6 |  |
Lake Point | Construction Products |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Property, plant, and equipment, including mineral reserves |  |  |  | 13.3 |  |
Mineral Reserves |  |  |  | 19.1 |  |
Purchase price |  |  |  |  | $ 65.1 |
Goodwill recorded, net |  |  |  | 15.6 |  |
Lake Point | Construction Products | Permits |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Intangible asset |  |  |  | $ 11.5 |  |

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