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v3.26.1

GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2022 | Dec. 31, 2025 | Dec. 31, 2024
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1,427.7 | $ 1,425.5 |  | $ 1,427.6 | $ 1,423.6
Goodwill, Foreign Currency Translation Gain (Loss) | 0.1 | (0.1) |  |  |
Goodwill, Period Increase (Decrease) |  | 2.0 |  |  |
Chlor Alkali Products and Vinyls |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 1,276.4 | 1,276.3 |  | 1,276.3 | 1,276.4
Goodwill, Foreign Currency Translation Gain (Loss) | 0.1 | (0.1) |  |  |
Goodwill, Impairment Loss |  |  | $ 557.6 |  |
Goodwill, Period Increase (Decrease) |  | 0.0 |  |  |
Epoxy |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 144.8 | 144.8 |  | 144.8 | 144.8
Goodwill, Foreign Currency Translation Gain (Loss) | 0.0 | 0.0 |  |  |
Goodwill, Impairment Loss |  |  | $ 142.2 |  |
Goodwill, Period Increase (Decrease) |  | 0.0 |  |  |
Winchester |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 6.5 | 4.4 |  | $ 6.5 | $ 2.4
Goodwill, Foreign Currency Translation Gain (Loss) | $ 0.0 | 0.0 |  |  |
Goodwill, Period Increase (Decrease) |  | $ 2.0 |  |  |

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