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Segments - Reconciliation of Segment Reporting to Consolidated (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | segment     6    
Sales to external customers $ 569.7 $ 951.8 $ 1,423.2 $ 1,964.9  
Equity in earnings of unconsolidated affiliates 14.4 40.3 24.2 72.5  
Adjusted EBITDA 9.4 123.6 88.3 251.7  
Investment in unconsolidated affiliates 212.3   212.3   $ 188.1
Depreciation and amortization $ 34.8 34.7 71.1 68.7  
Capital expenditures     $ 48.2 47.6  
Americas Styrenics          
Segment Reporting Information [Line Items]          
Percentage of ownership underlying net assets 50.00%   50.00%   50.00%
Investment in unconsolidated affiliates $ 212.3   $ 212.3   $ 188.1
Latex Binders Segment          
Segment Reporting Information [Line Items]          
Sales to external customers 164.9 230.2 384.0 454.1  
Latex Binders Segment | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA 17.0 20.6 38.6 38.1  
Synthetic Rubber Segment          
Segment Reporting Information [Line Items]          
Sales to external customers 36.4 112.1 138.0 236.7  
Synthetic Rubber Segment | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (27.7) 12.9 (12.5) 21.7  
Performance Plastics Segment [Member]          
Segment Reporting Information [Line Items]          
Sales to external customers 189.0 347.5 494.2 716.8  
Performance Plastics Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (5.6) 34.2 31.2 69.9  
Polystyrene [Member]          
Segment Reporting Information [Line Items]          
Sales to external customers 155.8 207.1 338.6 435.6  
Polystyrene [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA 14.8 16.2 26.6 32.9  
Feedstocks [Member]          
Segment Reporting Information [Line Items]          
Sales to external customers 23.6 54.9 68.4 121.7  
Feedstocks [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (3.5) (0.6) (19.8) 16.6  
Americas Styrenics [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Adjusted EBITDA $ 14.4 $ 40.3 $ 24.2 $ 72.5