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RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 52 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 7.4 | $ 4.0 | $ 6.8 | $ 8.3 | $ 11.4 | $ 15.1 | $ 237.8
Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 79.9
Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 3.8 | 1.6 | 0.0 | 0.0 |  |  | 23.6
Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 3.6 | 2.2 | 5.1 | 8.3 |  |  | 93.7
Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 | $ 0.2 | 1.7 | $ 0.0 |  |  | 40.6
Chlor Alkali Products and Vinyls |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 127.0
Chlor Alkali Products and Vinyls | Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 61.6
Chlor Alkali Products and Vinyls | Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 2.0
Chlor Alkali Products and Vinyls | Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 57.0
Chlor Alkali Products and Vinyls | Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 6.4
Epoxy |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 110.8
Epoxy | Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 18.3
Epoxy | Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 21.6
Epoxy | Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 36.7
Epoxy | Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 34.2
Winchester |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 0.0 |  | $ 0.0 |  | $ 0.0 | $ 0.0 |

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