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GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2020
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]          
Goodwill $ 1,423.4 $ 1,420.9   $ 1,424.0 $ 1,420.9
Goodwill, Purchase Accounting Adjustments (0.3)        
Goodwill, Foreign Currency Translation Gain (Loss) (0.3) 0.0      
Chlor Alkali Products and Vinyls          
Goodwill [Line Items]          
Goodwill 1,275.9 1,275.8   1,276.1 1,275.8
Goodwill, Purchase Accounting Adjustments 0.0        
Goodwill, Foreign Currency Translation Gain (Loss) (0.2) 0.0      
Goodwill, Impairment Loss     $ 557.6    
Epoxy          
Goodwill [Line Items]          
Goodwill 145.1 145.1   145.2 145.1
Goodwill, Purchase Accounting Adjustments 0.0        
Goodwill, Foreign Currency Translation Gain (Loss) (0.1) 0.0      
Goodwill, Impairment Loss     $ 142.2    
Winchester          
Goodwill [Line Items]          
Goodwill 2.4 0.0   $ 2.7 $ 0.0
Goodwill, Purchase Accounting Adjustments (0.3)        
Goodwill, Foreign Currency Translation Gain (Loss) $ 0.0 $ 0.0