Segment Information - Assets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Segment Reporting [Line Items]
Total assets	$ 1,503.4	$ 1,651.1
Assets of discontinued operations	0.0	35.4
Operating Segments
Segment Reporting [Line Items]
Total assets	1,454.9	1,561.3
Operating Segments \| Performance Materials
Segment Reporting [Line Items]
Total assets	843.9	822.7
Operating Segments \| Pavement Technologies
Segment Reporting [Line Items]
Total assets	299.0	357.7
Operating Segments \| Advanced Polymer Technologies segment
Segment Reporting [Line Items]
Total assets	312.0	380.9
Corporate and other
Segment Reporting [Line Items]
Total assets	$ 48.5	$ 54.4

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References + 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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