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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