Restructuring and Other (Income) Charges, net - Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]
Performance Chemicals repositioning	$ 0.0	$ 0.7	$ 1.2	$ 2.1
Other	0.2	0.3	1.2	8.0
Restructuring charges	0.2	1.0	2.4	10.1
Severance and other employee-related costs
Restructuring Cost and Reserve [Line Items]
Performance Chemicals repositioning	0.0	0.0	0.0	0.0
Other	0.2	0.1	0.7	2.6
Restructuring charges	0.2	0.1	0.7	2.6
Other charges (income)
Restructuring Cost and Reserve [Line Items]
Performance Chemicals repositioning	0.0	0.7	0.8	2.1
Other	0.0	0.2	0.5	1.0
Restructuring charges	0.0	0.9	1.3	3.1
Asset disposal charges
Restructuring Cost and Reserve [Line Items]
Performance Chemicals repositioning	0.0	0.0	0.4	0.0
Other	0.0	0.0	0.0	4.4
Restructuring charges	$ 0.0	$ 0.0	$ 0.4	$ 4.4

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- 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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