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Goodwill and Other Intangible Assets - Goodwill by segment (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 1,361.2 | $ 990.7
Construction Products |  |
Goodwill [Line Items] |  |
Goodwill | 861.2 | 516.1
Engineered Structures |  |
Goodwill [Line Items] |  |
Goodwill | 480.1 | 437.6
Transportation Products |  |
Goodwill [Line Items] |  |
Goodwill | $ 19.9 | $ 37.0

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