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Segments - Reconciliation of Segment Reporting to Consolidated (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
segment
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | segment     6    
Adjusted EBITDA $ (12.9) $ 198.4 $ 377.6 $ 668.0  
Equity in earnings of unconsolidated affiliates 22.8 17.1 83.8 70.2  
Investment in unconsolidated affiliates 269.2   269.2   $ 247.8
Capital expenditures     94.0 64.7  
Engineered Materials          
Segment Reporting Information [Line Items]          
Adjusted EBITDA 7.5 32.7 76.2 68.5  
Latex Binders          
Segment Reporting Information [Line Items]          
Adjusted EBITDA 31.0 37.1 90.6 86.2  
Base Plastics          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (14.9) 87.9 99.8 235.0  
Polystyrene          
Segment Reporting Information [Line Items]          
Adjusted EBITDA 18.7 51.2 87.0 149.6  
Feedstocks          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (78.0) (27.6) (59.8) 58.5  
Americas Styrenics [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA $ 22.8 $ 17.1 $ 83.8 $ 70.2  
AmSty          
Segment Reporting Information [Line Items]          
Percentage of ownership underlying net assets 50.00%   50.00%   50.00%
Investment in unconsolidated affiliates $ 269.2   $ 269.2   $ 247.8
AmSty | Americas Styrenics [Member]          
Segment Reporting Information [Line Items]          
Percentage of ownership underlying net assets 50.00%   50.00%