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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 company | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Environmental activities expenses, construction bid costs |  |  | $ 21.5 |  |  |  |
Accrued probable future environmental expenditures |  | $ 150.6 |  |  | $ 150.6 |  | $ 157.2
Environmental loss contingency, statement of financial position |  | 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
Placeholder |  | $ 2.4 |  | $ 38.1 | $ 28.2 | $ 52.5 |
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 |  | $ 36.2 |
Accrued probable future environmental expenditures |  | $ 142.4 |  |  | $ 142.4 |  |

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