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INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Americas Styrenics (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Investments in Unconsolidated Affiliates
Investments in unconsolidated affiliate	$ 269.0		$ 269.0		$ 252.2
AmSty
Investments in Unconsolidated Affiliates
Investments in unconsolidated affiliate	269.0		269.0		252.2
Investment in unconsolidated affiliates-difference between carrying amount and underlying equity	$ 10.0		$ 10.0		$ 4.8
Percentage of ownership underlying net assets	50.00%		50.00%		50.00%
Amortized weighted average remaining useful life			3.3
Dividends received from operating activities	$ 5.0	$ 10.0	$ 5.0	$ 30.0

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