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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2023 USD ($) | Feb. 29, 2020 company | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Accrued probable future environmental expenditures |  |  | $ 147.6 |  | $ 147.6 |  | $ 118.3
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Accrued expenses and other current liabilities, Other Liabilities, Noncurrent |  | Accrued expenses and other current liabilities, Other Liabilities, Noncurrent |  | Accrued expenses and other current liabilities, Other Liabilities, Noncurrent
Expense related to environmental activities |  |  | $ 38.1 | $ 18.8 | $ 52.5 | $ 23.8 |
Calvert City |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Accrual for environmental loss contingencies, number of companies negotiating consent decree | company |  | 3 |  |  |  |  |
Accrual for environmental loss contingencies, period increase (decrease) | $ 36.2 |  |  |  |  |  |
Accrued probable future environmental expenditures |  |  | $ 138.5 |  | $ 138.5 |  |

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