SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Net Income to Segment Adjusted EBITDA (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | $ 784.3 | $ 920.0 | $ 1,569.1 | $ 1,824.0 | |
| Cost of sales | (747.7) | (851.6) | (1,468.7) | (1,695.0) | |
| Selling, general and administrative expenses | (78.1) | (70.1) | (169.1) | (140.2) | |
| Equity in earnings of unconsolidated affiliates | 8.2 | 15.6 | 6.4 | 21.8 | |
| Other income and (expense) | (0.2) | 3.3 | 23.0 | (0.5) | |
| Other segment items | $ 15.3 | $ 3.0 | $ 49.9 | $ 10.1 | |
| 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 | $ 59.8 | $ 46.6 | $ 95.8 | $ 91.6 | |
| Adjusted EBITDA | 61.3 | 89.3 | 154.2 | 160.8 | |
| Investments in unconsolidated affiliate | 224.0 | 269.0 | 224.0 | 269.0 | $ 222.6 |
| Capital expenditures | 9.8 | 14.2 | 18.5 | 29.9 | |
| Engineered Materials | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 293.2 | 323.8 | 570.5 | 606.3 | |
| Latex Binders | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 204.2 | 252.4 | 413.5 | 493.9 | |
| Polymer Solutions | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 286.9 | 343.8 | 585.1 | 723.8 | |
| Amount recognized during performance obligation | 26.0 | ||||
| Operating Segments | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 784.3 | 920.0 | 1,569.1 | 1,824.0 | |
| Cost of sales | (747.7) | (851.6) | (1,468.7) | (1,695.0) | |
| Selling, general and administrative expenses | (45.8) | (39.7) | (79.0) | (78.7) | |
| Equity in earnings of unconsolidated affiliates | 8.2 | 15.6 | 6.4 | 21.8 | |
| Other income and (expense) | (0.7) | 2.6 | 24.8 | 1.7 | |
| Other segment items | 11.1 | 0.4 | 18.3 | 4.8 | |
| Depreciation and amortization | 51.9 | 42.0 | 83.3 | 82.2 | |
| Adjusted EBITDA | 61.3 | 89.3 | 154.2 | 160.8 | |
| Investments in unconsolidated affiliate | 224.0 | 269.0 | 224.0 | 269.0 | |
| Capital expenditures | 9.3 | 13.7 | 17.4 | 29.2 | |
| Operating Segments | Engineered Materials | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 293.2 | 323.8 | 570.5 | 606.3 | |
| Cost of sales | (274.1) | (301.4) | (535.2) | (583.3) | |
| Selling, general and administrative expenses | (19.6) | (18.1) | (36.1) | (31.6) | |
| Other income and (expense) | 0.1 | 0.8 | 0.3 | 0.9 | |
| Other segment items | 0.5 | (0.2) | (0.1) | (2.4) | |
| Depreciation and amortization | 31.0 | 27.1 | 57.4 | 52.7 | |
| Adjusted EBITDA | 31.1 | 32.0 | 56.8 | 42.6 | |
| Capital expenditures | 3.7 | 7.2 | 7.1 | 15.6 | |
| Operating Segments | Latex Binders | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 204.2 | 252.4 | 413.5 | 493.9 | |
| Cost of sales | (188.9) | (224.5) | (371.5) | (437.5) | |
| Selling, general and administrative expenses | (8.8) | (9.3) | (17.6) | (18.9) | |
| Other income and (expense) | (0.4) | (0.4) | (0.8) | (1.0) | |
| Other segment items | 0.1 | 0.1 | 0.2 | ||
| Depreciation and amortization | 10.7 | 7.3 | 17.6 | 14.6 | |
| Adjusted EBITDA | 16.8 | 25.6 | 41.3 | 51.3 | |
| Capital expenditures | 4.0 | 4.7 | 7.6 | 9.6 | |
| Operating Segments | Polymer Solutions | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Net sales | 286.9 | 343.8 | 585.1 | 723.8 | |
| Cost of sales | (284.7) | (325.7) | (562.0) | (674.2) | |
| Selling, general and administrative expenses | (17.4) | (12.3) | (25.3) | (28.2) | |
| Other income and (expense) | (0.4) | 2.2 | 25.3 | 1.8 | |
| Other segment items | 10.6 | 0.4 | 18.3 | 7.0 | |
| Depreciation and amortization | 10.2 | 7.6 | 8.3 | 14.9 | |
| Adjusted EBITDA | 5.2 | 16.0 | 49.7 | 45.1 | |
| Capital expenditures | 1.6 | 1.8 | 2.7 | 4.0 | |
| Operating Segments | Americas Styrenics | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Equity in earnings of unconsolidated affiliates | 8.2 | 15.6 | 6.4 | 21.8 | |
| Other segment items | 0.1 | ||||
| Adjusted EBITDA | 8.2 | 15.7 | 6.4 | 21.8 | |
| Investments in unconsolidated affiliate | 224.0 | 269.0 | 224.0 | 269.0 | |
| Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | |||||
| SEGMENTS AND GEOGRAPHIC INFORMATION | |||||
| Selling, general and administrative expenses | (32.3) | (30.4) | (90.1) | (61.5) | |
| Other income and (expense) | 0.5 | 0.7 | (1.8) | (2.2) | |
| Other segment items | 4.2 | 2.6 | 31.6 | 5.3 | |
| Depreciation and amortization | 7.9 | 4.6 | 12.5 | 9.4 | |
| Capital expenditures | $ 0.5 | $ 0.5 | $ 1.1 | $ 0.7 | |