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SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Segment Reporting to Consolidated (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($) | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Number of operating segments | segment |  |  | 5 |  |
Total Segment Adjusted EBITDA | $ 89.3 | $ 74.1 | $ 160.8 | $ 136.5 |
Engineered Materials |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Adjusted EBITDA | 25.2 | 11.8 | 29.5 | 0.1 |
Latex Binders |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Adjusted EBITDA | 25.6 | 23.5 | 51.3 | 47.5 |
Plastics Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Adjusted EBITDA | 16.3 | 24.6 | 39.0 | 48.2 |
Polystyrene |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Adjusted EBITDA | 6.6 | 1.7 | 19.2 | 10.6 |
Americas Styrenics |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Segment Adjusted EBITDA | $ 15.6 | $ 12.5 | $ 21.8 | $ 30.1 |
AmSty |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of ownership underlying net assets | 50.00% |  | 50.00% |  | 50.00%
AmSty | Americas Styrenics |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of ownership underlying net assets | 50.00% |  | 50.00% |  |

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- Definition A non-GAAP measure defined as income from continuing operations before interest expense, net; provision for income taxes; depreciation and amortization expense; loss on extinguishment of long-term debt; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring and other items. + References No definition available. + Details
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