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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2020
company
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Equity Method Investments [Line Items]            
Accrued probable future environmental expenditures   $ 141.3   $ 141.3   $ 146.0
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
Environmental insurance recovery   $ 1.8 $ 21.8 $ 6.7 $ 25.8  
Proceeds from insurance recoveries       34.0    
Gains related to insurance recoveries   0.6   1.3    
Calvert City            
Schedule of Equity Method Investments [Line Items]            
Accrual for environmental loss contingencies, number of companies negotiating consent decree | company 3          
Accrued probable future environmental expenditures   $ 133.3   $ 133.3