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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 966.6	[1]	$ 958.5
Construction Products
Goodwill [Line Items]
Goodwill	492.0		483.9
Engineered Structures
Goodwill [Line Items]
Goodwill	437.6		437.6
Transportation Products
Goodwill [Line Items]
Goodwill	$ 37.0		$ 37.0
[1] (unaudited)

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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