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Segment information - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information    
Assets $ 2,736.5 $ 2,469.0
Operating Segments    
Segment Reporting Information    
Assets 2,662.0 2,391.8
Operating Segments | Performance Materials    
Segment Reporting Information    
Assets 784.6 716.2
Operating Segments | Performance Chemicals    
Segment Reporting Information    
Assets 1,877.4 1,675.6
Corporate and other    
Segment Reporting Information    
Assets $ 74.5 $ 77.2