SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 1,671.4	$ 2,321.7	$ 5,218.4	$ 7,399.2
United States
Disaggregation of Revenue [Line Items]
Sales	1,110.1	1,449.0	3,484.5	4,513.6
Europe
Disaggregation of Revenue [Line Items]
Sales	162.5	368.7	477.5	1,254.4
Other foreign
Disaggregation of Revenue [Line Items]
Sales	398.8	504.0	1,256.4	1,631.2
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	969.6	1,263.5	3,089.0	3,912.2
Chlor Alkali Products and Vinyls | United States
Disaggregation of Revenue [Line Items]
Sales	651.0	870.8	2,069.8	2,636.6
Chlor Alkali Products and Vinyls | Europe
Disaggregation of Revenue [Line Items]
Sales	57.9	80.9	175.3	233.7
Chlor Alkali Products and Vinyls | Other foreign
Disaggregation of Revenue [Line Items]
Sales	260.7	311.8	843.9	1,041.9
Epoxy
Disaggregation of Revenue [Line Items]
Sales	321.6	644.1	1,016.1	2,206.3
Epoxy | United States
Disaggregation of Revenue [Line Items]
Sales	131.4	201.0	431.8	696.7
Epoxy | Europe
Disaggregation of Revenue [Line Items]
Sales	84.8	280.3	258.8	993.7
Epoxy | Other foreign
Disaggregation of Revenue [Line Items]
Sales	105.4	162.8	325.5	515.9
Winchester
Disaggregation of Revenue [Line Items]
Sales	380.2	414.1	1,113.3	1,280.7
Winchester | United States
Disaggregation of Revenue [Line Items]
Sales	327.7	377.2	982.9	1,180.3
Winchester | Europe
Disaggregation of Revenue [Line Items]
Sales	19.8	7.5	43.4	27.0
Winchester | Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 32.7	$ 29.4	$ 87.0	$ 73.4