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GOODWILL AND INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying value of goodwill were as follows:
| Chlor Alkali Products and Vinyls |  | Epoxy |  | Winchester |  | Total
Goodwill | ($ in millions)
Balance at January 1, 2025(1) | $ | 1,276.4 |  |  | $ | 144.8 |  |  | $ | 2.4 |  |  | $ | 1,423.6 |
Acquisition activity | — |  |  | — |  |  | 2.0 |  |  | 2.0 |
Foreign currency translation adjustment | (0.1) |  |  | — |  |  | — |  |  | (0.1) |
Balance at June 30, 2025(1) | $ | 1,276.3 |  |  | $ | 144.8 |  |  | $ | 4.4 |  |  | $ | 1,425.5 |
Balance at January 1, 2026(1) | $ | 1,276.3 |  |  | $ | 144.8 |  |  | $ | 6.5 |  |  | $ | 1,427.6 |
Foreign currency translation adjustment | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Balance at June 30, 2026(1) | $ | 1,276.4 |  |  | $ | 144.8 |  |  | $ | 6.5 |  |  | $ | 1,427.7 |
(1)Includes cumulative goodwill impairment of $557.6 million and $142.2 million in Chlor Alkali Products and Vinyls and Epoxy, respectively.
Schedule of Finite-Lived Intangible Assets | Intangible assets consisted of the following:
| June 30, 2026 |  | December 31, 2025 |  | June 30, 2025
| Gross Amount |  | Accumulated Amortization |  | Net |  | Gross Amount |  | Accumulated Amortization |  | Net |  | Gross Amount |  | Accumulated Amortization |  | Net
Intangible Assets | ($ in millions)
Customers, customer contracts and relationships | $ | 521.8 |  |  | $ | (374.3) |  |  | $ | 147.5 |  |  | $ | 524.4 |  |  | $ | (358.4) |  |  | $ | 166.0 |  |  | $ | 677.6 |  |  | $ | (493.7) |  |  | $ | 183.9 |
Trade names | 3.5 |  |  | (1.4) |  |  | 2.1 |  |  | 3.5 |  |  | (1.2) |  |  | 2.3 |  |  | 3.7 |  |  | (1.0) |  |  | 2.7 |
Acquired technology | 11.4 |  |  | (9.6) |  |  | 1.8 |  |  | 11.3 |  |  | (9.4) |  |  | 1.9 |  |  | 94.8 |  |  | (94.2) |  |  | 0.6 |
Other | 4.9 |  |  | (0.7) |  |  | 4.2 |  |  | 4.9 |  |  | (0.7) |  |  | 4.2 |  |  | 7.2 |  |  | (0.7) |  |  | 6.5 |
Total intangible assets | $ | 541.6 |  |  | $ | (386.0) |  |  | $ | 155.6 |  |  | $ | 544.1 |  |  | $ | (369.7) |  |  | $ | 174.4 |  |  | $ | 783.3 |  |  | $ | (589.6) |  |  | $ | 193.7 |

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