v3.25.2
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