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Segment Information - Depreciation and amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information      
Depreciation and amortization $ 108.3 $ 122.8 $ 108.8
Performance Materials      
Segment Reporting Information      
Depreciation and amortization 38.7 38.3 36.1
Performance Chemicals      
Segment Reporting Information      
Depreciation and amortization 38.8 53.2 43.1
Advanced Polymer Technologies segment      
Segment Reporting Information      
Depreciation and amortization $ 30.8 $ 31.3 $ 29.6