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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]          
Accrued probable future environmental expenditures $ 117.2   $ 117.2   $ 118.3
Expense related to environmental activities $ 13.0 $ 3.0 $ 14.4 $ 5.0  
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
Calvert City          
Schedule of Equity Method Investments [Line Items]          
Accrued probable future environmental expenditures $ 107.9   $ 107.9