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Goodwill and Other Intangible Assets, net - Carrying Amount (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]      
Goodwill, beginning balance $ 527.5 $ 518.5  
Segment change reallocation   0.0  
Foreign currency translation (3.2) 9.0  
Goodwill impairment charge (349.1) 0.0 $ 0.0
Goodwill, ending balance 175.2 527.5 518.5
Goodwill 524.3    
Accumulated impairment losses (349.1)    
Goodwill, net 175.2 527.5 518.5
Performance Materials      
Goodwill [Roll Forward]      
Goodwill, beginning balance 4.3 4.3  
Segment change reallocation   0.0  
Foreign currency translation 0.0 0.0  
Goodwill impairment charge 0.0    
Goodwill, ending balance 4.3 4.3 4.3
Goodwill 4.3    
Accumulated impairment losses 0.0    
Goodwill, net 4.3 4.3 4.3
Performance Chemicals      
Goodwill [Roll Forward]      
Goodwill, beginning balance 349.4 514.2  
Segment change reallocation   (165.0)  
Foreign currency translation (0.3) 0.2  
Goodwill impairment charge (349.1)    
Goodwill, ending balance 0.0 349.4 514.2
Goodwill 349.1    
Accumulated impairment losses (349.1)    
Goodwill, net 0.0 349.4 514.2
Advanced Polymer Technologies segment      
Goodwill [Roll Forward]      
Goodwill, beginning balance 173.8 0.0  
Segment change reallocation   165.0  
Foreign currency translation (2.9) 8.8  
Goodwill impairment charge 0.0    
Goodwill, ending balance 170.9 173.8 0.0
Goodwill 170.9    
Accumulated impairment losses 0.0    
Goodwill, net $ 170.9 $ 173.8 $ 0.0