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RESTRUCTURING CHARGES (Details 1) $ in Millions	3 Months Ended				6 Months Ended		40 Months Ended	41 Months Ended	55 Months Ended	99 Months Ended
	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Oct. 21, 2021 T	Dec. 11, 2019 T
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6.8	$ 8.3	$ 19.2	$ 60.9	$ 15.1	$ 80.1				$ 208.3
Inception to date Amounts Utilized (cash)										112.2
Inception to date Amounts Utilized (non-cash)										79.9
Epoxy Optimization Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5.8		13.3		9.3	71.1				90.8
Additional restructuring and related expected cost	15.0				15.0		$ 15.0	$ 15.0	$ 15.0	15.0
McIntosh Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1		2.5		2.0	3.9	20.5
Additional restructuring and related expected cost	20.0				20.0		20.0	20.0	20.0	20.0
McIntosh Restructuring Capacity Reduction | T											400,000
Freeport 2021 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3		1.4		0.7	2.1		13.8
Additional restructuring and related expected cost	5.0				5.0		5.0	5.0	5.0	5.0
Freeport 2019 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6		$ 2.0		3.1	$ 3.0			83.2
Additional restructuring and related expected cost	$ 15.0				$ 15.0		$ 15.0	$ 15.0	$ 15.0	$ 15.0
Freeport Chlor Alkali Capacity Reduction | T												230,000

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Freeport, TX chlor alkali production capacity reduction announced on December 11, 2019.

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Reduction of diaphragm-grade chlor alkali capacity at our McIntosh, AL facility announced in 2021.

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