GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,420.9	$ 1,420.2	$ 1,420.6	$ 1,420.2
Foreign currency translation adjustment	0.3	0.0
Chlor Alkali Products and Vinyls
Goodwill [Line Items]
Goodwill	1,275.9	1,275.3	1,275.6	1,275.3
Foreign currency translation adjustment	0.3	0.0
Epoxy
Goodwill [Line Items]
Goodwill	145.0	144.9	$ 145.0	$ 144.9
Foreign currency translation adjustment	$ 0.0	$ 0.0