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RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		40 Months Ended	41 Months Ended	55 Months Ended	99 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6.8	$ 8.3	$ 19.2	$ 60.9	$ 15.1	$ 80.1				$ 208.3
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	0.0	3.3	0.0						17.9
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.7	0.0	1.7	39.7						37.2
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5.1	8.3	9.3	8.4						73.3
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	$ 0.0	4.9	$ 12.8						79.9
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
McIntosh Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges							0.0
McIntosh Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges							6.4
McIntosh Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges							11.4
McIntosh Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ 2.7
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
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0.0
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0.0
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								13.8
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 0.0
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
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									2.1
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0.0
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									22.2
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 58.9
Epoxy Optimization Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5.8		$ 13.3		$ 9.3	$ 71.1				90.8
Epoxy Optimization Plan | Epoxy | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										15.8
Epoxy Optimization Plan | Epoxy | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										30.8
Epoxy Optimization Plan | Epoxy | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										25.9
Epoxy Optimization Plan | Epoxy | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 18.3

X

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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