SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended		84 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023
Sales [Abstract]
Sales	$ 1,844.3	$ 2,461.4
Income before taxes:
Income (loss) before taxes	194.8	523.6
Corporate/Other:
Environmental expense	3.2	5.6
Restructuring charges	(60.9)	(3.1)	$ (357.5)
Other operating income	0.5	0.0
Interest expense	(42.4)	(32.9)
Interest income	1.1	0.4
Non-operating pension income	5.7	9.6
Corporate/other
Corporate/Other:
Environmental expense	3.2	5.6
Other corporate and unallocated costs	(34.3)	(30.3)
Restructuring charges	(60.9)	(3.1)
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	1,117.1	1,245.2
Income before taxes:
Income (loss) before taxes	245.9	328.6
Epoxy
Sales [Abstract]
Sales	360.7	789.5
Income before taxes:
Income (loss) before taxes	21.4	138.0
Winchester
Sales [Abstract]
Sales	366.5	426.7
Income before taxes:
Income (loss) before taxes	$ 61.0	$ 118.9