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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2020
company
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Equity Method Investments [Line Items]              
Payment of post-acquisition date earnout liability   $ 4.7 $ 1.8   $ 8.6 $ 6.7  
Accrued probable future environmental expenditures   $ 132.3     $ 132.3   $ 141.2
Environmental loss contingency, statement of financial position   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
Proceeds from insurance recoveries       $ 34.0      
Calvert City              
Schedule of Equity Method Investments [Line Items]              
Accrual for environmental loss contingencies, number of companies negotiating consent decree | company 3            
Payment of post-acquisition date earnout liability             $ 21.3
Environment remediation expense, extension period (in years)             2 years
Accrued probable future environmental expenditures   $ 123.1     $ 123.1   $ 133.2