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RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 64 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 10.5 | $ 9.1 | $ 7.4 | $ 4.0 | $ 19.6 | $ 11.4 | $ 279.5
Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 1.6 | 0.8 | 0.0 | 0.0 |  |  | 86.5
Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 | 4.1 | 3.8 | 1.6 |  |  | 36.2
Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 8.9 | 4.1 | 3.6 | 2.2 |  |  | 111.6
Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 | $ 0.1 | 0.0 | $ 0.2 |  |  | 45.2
Chlor Alkali Products and Vinyls |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 151.0
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 |  |  |  |  |  |  | 12.5
Chlor Alkali Products and Vinyls | Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 70.0
Chlor Alkali Products and Vinyls | Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 6.9
Epoxy |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 125.4
Epoxy | Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 24.9
Epoxy | Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 20.6
Epoxy | Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 41.6
Epoxy | Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 38.3
Winchester |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 0.0 |  | $ 0.0 |  | $ 0.0 | $ 0.0 |
Other |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 3.1
Other | Write-off of equipment and facility |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 0.0
Other | Employee severance and related benefit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 3.1
Other | Facility exit costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 0.0
Other | Lease and other contract termination costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 0.0

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