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SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended				6 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
Sales [Abstract]
Sales	$ 1,644.0		$ 1,702.7		$ 3,279.3	$ 3,547.0
Income before Taxes
Income (loss) before taxes	96.6		177.9		156.9	372.7
Corporate/Other:
Environmental expense	6.4		13.0		12.2	16.2
Restructuring charges	(6.8)	$ (8.3)	(19.2)	$ (60.9)	(15.1)	(80.1)	$ (208.3)
Other operating income	0.0		27.0		0.2	27.5
Interest expense	(46.6)		(45.3)		(91.2)	(87.7)
Interest income	0.9		1.1		1.7	2.2
Non-operating pension income	5.9		5.4		12.7	11.1
Gain on Sale of Domestic Private Trucking Fleet and Operations			27.0			27.0
Corporate/other
Corporate/Other:
Environmental expense	6.4		13.0		12.2	16.2
Other corporate and unallocated costs	(17.0)		(22.4)		(42.8)	(56.7)
Restructuring charges	(6.8)		(19.2)		(15.1)	(80.1)
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	920.3		1,002.3		1,804.9	2,119.4
Income before Taxes
Income (loss) before taxes	99.3		180.1		175.9	426.0
Epoxy
Sales [Abstract]
Sales	317.7		333.8		659.0	694.5
Income before Taxes
Income (loss) before taxes	(3.0)		(0.5)		(14.8)	20.9
Winchester
Sales [Abstract]
Sales	406.0		366.6		815.4	733.1
Income before Taxes
Income (loss) before taxes	$ 70.3		$ 64.7		$ 142.5	$ 125.7

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