Goodwill and Other Intangible Assets, net - Carrying Amount (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Goodwill [Line Items]
Goodwill	$ 4.3	$ 4.3
Performance Materials
Goodwill [Line Items]
Goodwill	4.3	4.3
Pavement Technologies Segment
Goodwill [Line Items]
Goodwill	0.0	0.0
Impairment losses	306.6	306.6
Advanced Polymer Technologies segment
Goodwill [Line Items]
Goodwill	0.0	0.0
Impairment losses	$ 183.8	$ 183.8

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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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details