v3.26.1
COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2020
company
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Equity Method Investments [Line Items]          
Environmental activities expenses, construction bid costs         $ 19.8
Accrued expenses and other assets and liabilities, net   $ 3.9 $ 4.9    
Accrued probable future environmental expenditures   $ 134.9   $ 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  
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        
Accrued expenses and other assets and liabilities, net       $ 21.3  
Environment remediation expense, extension period (in years)       2 years  
Accrued probable future environmental expenditures   $ 125.5