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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