Segment Information - Restructuring, Acquisition, Strategic Investment (Details) $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information
Number of reportable segments \| segment	3
Restructuring and other (income) charges, net	$ 186.2	$ 170.2	$ 13.8
Acquisition and other-related (income) costs, net	0.3	4.5	5.9
(Gain) loss on sale of strategic investment	11.4	(19.3)	0.0
Pension and postretirement settlement and curtailment (income) charges, net	0.2	0.0	0.2
Performance Materials
Segment Reporting Information
Restructuring and other (income) charges, net	0.9	9.0	4.8
Acquisition and other-related (income) costs, net	0.0	0.0	0.3
(Gain) loss on sale of strategic investment	(0.1)	(19.3)	0.0
Pension and postretirement settlement and curtailment (income) charges, net	0.0	0.0	0.2
Performance Chemicals
Segment Reporting Information
Restructuring and other (income) charges, net	185.1	144.5	7.0
Acquisition and other-related (income) costs, net	0.3	4.5	5.6
(Gain) loss on sale of strategic investment	9.3	0.0	0.0
Pension and postretirement settlement and curtailment (income) charges, net	0.2	0.0	0.0
Advanced Polymer Technologies segment
Segment Reporting Information
Restructuring and other (income) charges, net	0.2	16.7	2.0
Asset impairment charges		13.3
Acquisition and other-related (income) costs, net	0.0	0.0	0.0
(Gain) loss on sale of strategic investment	2.2	0.0	0.0
Pension and postretirement settlement and curtailment (income) charges, net	$ 0.0	$ 0.0	$ 0.0

The combination of Acquisition-Related Costs and Inventory Step-Up amortization.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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