SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 1,844.3	$ 2,461.4
United States
Disaggregation of Revenue [Line Items]
Sales	1,248.0	1,464.1
Europe
Disaggregation of Revenue [Line Items]
Sales	176.9	432.1
Other foreign
Disaggregation of Revenue [Line Items]
Sales	419.4	565.2
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	1,117.1	1,245.2
Chlor Alkali Products and Vinyls | United States
Disaggregation of Revenue [Line Items]
Sales	766.5	819.4
Chlor Alkali Products and Vinyls | Europe
Disaggregation of Revenue [Line Items]
Sales	72.4	70.4
Chlor Alkali Products and Vinyls | Other foreign
Disaggregation of Revenue [Line Items]
Sales	278.2	355.4
Epoxy
Disaggregation of Revenue [Line Items]
Sales	360.7	789.5
Epoxy | United States
Disaggregation of Revenue [Line Items]
Sales	151.6	242.8
Epoxy | Europe
Disaggregation of Revenue [Line Items]
Sales	96.6	359.0
Epoxy | Other foreign
Disaggregation of Revenue [Line Items]
Sales	112.5	187.7
Winchester
Disaggregation of Revenue [Line Items]
Sales	366.5	426.7
Winchester | United States
Disaggregation of Revenue [Line Items]
Sales	329.9	401.9
Winchester | Europe
Disaggregation of Revenue [Line Items]
Sales	7.9	2.7
Winchester | Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 28.7	$ 22.1