SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Net Income to Segment Adjusted EBITDA (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | $ 845.4 | $ 784.3 | $ 1,570.1 | $ 1,569.1 | |
| Cost of sales | (745.7) | (747.7) | (1,408.7) | (1,468.7) | |
| Selling, general and administrative expenses | (100.8) | (78.1) | (188.2) | (169.1) | |
| Equity in earnings (losses) of unconsolidated affiliate | 1.2 | 8.2 | 3.3 | 6.4 | |
| Other income and (expense) | (5.5) | (0.2) | (9.7) | 23.0 | |
| Other segment items | $ 47.6 | $ 15.3 | $ 78.2 | $ 49.9 | |
| Segment reporting, other segment item, composition, description | Other segment items contain activity primarily defined as addbacks to arrive at Adjusted EBITDA included from the loss on extinguishment of long-term debt and certain debt issuance costs; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. | Other segment items contain activity primarily defined as addbacks to arrive at Adjusted EBITDA included from the loss on extinguishment of long-term debt and certain debt issuance costs; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. | Other segment items contain activity primarily defined as addbacks to arrive at Adjusted EBITDA included from the loss on extinguishment of long-term debt and certain debt issuance costs; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. | Other segment items contain activity primarily defined as addbacks to arrive at Adjusted EBITDA included from the loss on extinguishment of long-term debt and certain debt issuance costs; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. | |
| Depreciation and amortization expenses | $ 38.8 | $ 59.8 | $ 88.6 | $ 95.8 | |
| Adjusted EBITDA | 103.6 | 61.3 | 179.5 | 154.2 | |
| Investments in unconsolidated affiliate | 210.2 | 224.0 | 210.2 | 224.0 | $ 206.9 |
| Capital expenditures | 10.0 | 9.8 | 21.3 | 18.5 | |
| Engineered Materials | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 291.5 | 293.2 | 554.5 | 570.5 | |
| Latex Binders | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 247.9 | 204.2 | 444.4 | 413.5 | |
| Polymer Solutions | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 306.0 | 286.9 | 571.2 | 585.1 | |
| Operating Segments | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 845.4 | 784.3 | 1,570.1 | 1,569.1 | |
| Cost of sales | (745.7) | (747.7) | (1,408.7) | (1,468.7) | |
| Selling, general and administrative expenses | (40.8) | (45.8) | (82.2) | (79.0) | |
| Equity in earnings (losses) of unconsolidated affiliate | 1.2 | 8.2 | 3.3 | 6.4 | |
| Other income and (expense) | 0.7 | (0.7) | 1.1 | 24.8 | |
| Other segment items | 5.1 | 11.1 | 11.7 | 18.3 | |
| Depreciation and amortization expenses | 37.7 | 51.9 | 84.2 | 83.3 | |
| Adjusted EBITDA | 103.6 | 61.3 | 179.5 | 154.2 | |
| Investments in unconsolidated affiliate | 210.2 | 224.0 | 210.2 | 224.0 | |
| Capital expenditures | 9.9 | 9.3 | 21.2 | 17.4 | |
| Operating Segments | Engineered Materials | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 291.5 | 293.2 | 554.5 | 570.5 | |
| Cost of sales | (256.5) | (274.1) | (498.7) | (535.2) | |
| Selling, general and administrative expenses | (18.0) | (19.6) | (36.7) | (36.1) | |
| Other income and (expense) | 0.2 | 0.1 | 0.2 | 0.3 | |
| Other segment items | 0.1 | 0.5 | 2.2 | (0.1) | |
| Depreciation and amortization expenses | 25.9 | 31.0 | 55.4 | 57.4 | |
| Adjusted EBITDA | 43.2 | 31.1 | 76.9 | 56.8 | |
| Capital expenditures | 3.5 | 3.7 | 7.7 | 7.1 | |
| Operating Segments | Latex Binders | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 247.9 | 204.2 | 444.4 | 413.5 | |
| Cost of sales | (228.2) | (188.9) | (407.9) | (371.5) | |
| Selling, general and administrative expenses | (10.2) | (8.8) | (19.6) | (17.6) | |
| Other income and (expense) | (0.4) | (0.8) | |||
| Other segment items | (0.2) | (0.1) | 0.1 | ||
| Depreciation and amortization expenses | 6.5 | 10.7 | 15.4 | 17.6 | |
| Adjusted EBITDA | 15.8 | 16.8 | 32.2 | 41.3 | |
| Capital expenditures | 3.7 | 4.0 | 8.1 | 7.6 | |
| Operating Segments | Polymer Solutions | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 306.0 | 286.9 | 571.2 | 585.1 | |
| Cost of sales | (261.0) | (284.7) | (502.1) | (562.0) | |
| Selling, general and administrative expenses | (12.6) | (17.4) | (25.9) | (25.3) | |
| Other income and (expense) | 0.5 | (0.4) | 0.9 | 25.3 | |
| Other segment items | 5.2 | 10.6 | 9.6 | 18.3 | |
| Depreciation and amortization expenses | 5.3 | 10.2 | 13.4 | 8.3 | |
| Adjusted EBITDA | 43.4 | 5.2 | 67.1 | 49.7 | |
| Capital expenditures | 2.7 | 1.6 | 5.4 | 2.7 | |
| Operating Segments | Americas Styrenics | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Equity in earnings (losses) of unconsolidated affiliate | 1.2 | 8.2 | 3.3 | 6.4 | |
| Adjusted EBITDA | 1.2 | 8.2 | 3.3 | 6.4 | |
| Investments in unconsolidated affiliate | 210.2 | 224.0 | 210.2 | 224.0 | |
| Corporate | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Selling, general and administrative expenses | (60.0) | (32.3) | (106.0) | (90.1) | |
| Other income and (expense) | (6.2) | 0.5 | (10.8) | (1.8) | |
| Other segment items | 42.5 | 4.2 | 66.5 | 31.6 | |
| Depreciation and amortization expenses | 1.1 | 7.9 | 4.4 | 12.5 | |
| Capital expenditures | $ 0.1 | $ 0.5 | $ 0.1 | $ 1.1 | |