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SEGMENT INFORMATION (Details 3) - 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
Transferred over Time
Disaggregation of Revenue [Line Items]
Sales	37.8	26.1	57.6	48.8
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 | Caustic soda
Disaggregation of Revenue [Line Items]
Sales	376.8	454.9	732.5	1,001.7
Chlor Alkali Products and Vinyls | Chlorine, chlorine-derivatives and other co-products
Disaggregation of Revenue [Line Items]
Sales	543.5	547.4	1,072.4	1,117.7
Epoxy
Disaggregation of Revenue [Line Items]
Sales	317.7	333.8	659.0	694.5
Epoxy | Aromatics and allylics
Disaggregation of Revenue [Line Items]
Sales	128.3	128.7	283.2	271.0
Epoxy | Epoxy resins
Disaggregation of Revenue [Line Items]
Sales	189.4	205.1	375.8	423.5
Winchester
Disaggregation of Revenue [Line Items]
Sales	406.0	366.6	815.4	733.1
Winchester | Commercial
Disaggregation of Revenue [Line Items]
Sales	222.0	199.4	464.8	399.9
Winchester | Military and law enforcement
Disaggregation of Revenue [Line Items]
Sales	$ 184.0	$ 167.2	$ 350.6	$ 333.2

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