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v3.25.3

GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2021 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1,425.9 | $ 1,423.7 |  | $ 1,423.6 | $ 1,424.0
Goodwill, Period Increase (Decrease) | 2.4 | (0.3) |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (0.1) |  |  |  |
Chlor Alkali Products and Vinyls |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 1,276.3 | 1,276.1 |  | 1,276.4 | 1,276.1
Goodwill, Period Increase (Decrease) | 0.0 | 0.0 |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (0.1) |  |  |  |
Goodwill, Impairment Loss |  |  | $ 557.6 |  |
Epoxy |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 144.8 | 145.2 |  | 144.8 | 145.2
Goodwill, Period Increase (Decrease) | 0.0 | 0.0 |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 0.0 |  |  |  |
Goodwill, Impairment Loss |  |  | $ 142.2 |  |
Winchester |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 4.8 | 2.4 |  | $ 2.4 | $ 2.7
Goodwill, Period Increase (Decrease) | 2.4 | $ (0.3) |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | $ 0.0 |  |  |  |

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