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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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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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