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INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Americas Styrenics (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in Unconsolidated Affiliates      
Investments in unconsolidated affiliate $ 252.2 $ 255.1 $ 247.8
AmSty      
Investments in Unconsolidated Affiliates      
Investments in unconsolidated affiliate 252.2 255.1  
Investment in unconsolidated affiliates-difference between carrying amount and underlying equity $ 4.8 8.4  
Percentage of ownership underlying net assets 50.00%    
Amortized weighted average remaining useful life 1.3    
Dividends received from operating activities $ 65.0 $ 95.0 $ 85.0