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COMMITMENTS AND CONTINGENCIES- Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 29, 2020
company
Loss Contingencies [Line Items]            
Environment remediation expense, completion of certain remedial action activities     $ 20.6      
Environmental activities expenses, construction bid costs   $ 19.8        
Accrued probable future environmental expenditures $ 146.0 $ 146.0 $ 157.2 $ 118.3 $ 124.5  
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other current liabilities, Other non-current liabilities Accrued expenses and other current liabilities, Other non-current liabilities Accrued expenses and other current liabilities, Other non-current liabilities      
Insurance recoveries   $ 34.7 $ 1.7 $ 8.3    
Insurance recoveries, cash received $ 0.7          
Estimated insurance recoveries to be received 34.0 34.0        
Calvert City            
Loss Contingencies [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 $ 137.7 $ 137.7