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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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