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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accrued probable future environmental expenditures | $ 119.9 |  | $ 119.9 |  | $ 124.5
Expense related to environmental activities | 3.0 | $ 12.5 | 5.0 | $ 13.0 |
Insurance recoveries | 7.6 |  | 8.2 | $ 4.5 |
Calvert City |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accrued probable future environmental expenditures | $ 107.7 |  | $ 107.7 |  |

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