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Goodwill and Other Intangible Assets - Goodwill by segment (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 1,348.9	$ 1,361.2
Construction Products
Goodwill [Line Items]
Goodwill	848.8	861.2
Engineered Structures
Goodwill [Line Items]
Goodwill	480.2	480.1
Transportation Products
Goodwill [Line Items]
Goodwill	$ 19.9	$ 19.9

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- Definition

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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