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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accrued probable future environmental expenditures | $ 131.6 |  | $ 131.6 |  | $ 124.5
Expense related to environmental activities | 18.8 | $ 9.4 | 23.8 | $ 22.4 |
Insurance recoveries | 0.1 |  | 8.3 | $ 4.5 |
Calvert City |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accrued probable future environmental expenditures | $ 120.9 |  | $ 120.9 |  |

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