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Segment information - Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information
Assets	$ 2,022.6	$ 2,623.3
Operating Segments
Segment Reporting Information
Assets	1,959.6	2,554.1
Operating Segments | Performance Materials
Segment Reporting Information
Assets	781.6	738.0
Operating Segments | Performance Chemicals
Segment Reporting Information
Assets	613.0	1,218.1
Operating Segments | Advanced Polymer Technologies segment
Segment Reporting Information
Assets	565.0	598.0
Corporate and other
Segment Reporting Information
Assets	$ 63.0	$ 69.2

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