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SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 1,644.0	$ 1,702.7	$ 3,279.3	$ 3,547.0
United States
Disaggregation of Revenue [Line Items]
Sales	1,211.9	1,126.4	2,400.9	2,374.4
Europe
Disaggregation of Revenue [Line Items]
Sales	127.3	138.2	259.3	315.0
Other foreign
Disaggregation of Revenue [Line Items]
Sales	304.8	438.1	619.1	857.6
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	920.3	1,002.3	1,804.9	2,119.4
Chlor Alkali Products and Vinyls | United States
Disaggregation of Revenue [Line Items]
Sales	671.5	652.3	1,307.1	1,418.8
Chlor Alkali Products and Vinyls | Europe
Disaggregation of Revenue [Line Items]
Sales	45.0	45.0	80.8	117.4
Chlor Alkali Products and Vinyls | Other foreign
Disaggregation of Revenue [Line Items]
Sales	203.8	305.0	417.0	583.2
Epoxy
Disaggregation of Revenue [Line Items]
Sales	317.7	333.8	659.0	694.5
Epoxy | United States
Disaggregation of Revenue [Line Items]
Sales	166.8	148.8	338.1	300.4
Epoxy | Europe
Disaggregation of Revenue [Line Items]
Sales	74.9	77.4	164.2	174.0
Epoxy | Other foreign
Disaggregation of Revenue [Line Items]
Sales	76.0	107.6	156.7	220.1
Winchester
Disaggregation of Revenue [Line Items]
Sales	406.0	366.6	815.4	733.1
Winchester | United States
Disaggregation of Revenue [Line Items]
Sales	373.6	325.3	755.7	655.2
Winchester | Europe
Disaggregation of Revenue [Line Items]
Sales	7.4	15.8	14.3	23.6
Winchester | Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 25.0	$ 25.5	$ 45.4	$ 54.3

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