v3.26.1
Equity - Non-controlling interests financial information (Details) - USD ($)
12 Months Ended
Nov. 05, 2009
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Non-controlling interests   $ 96,640,000 $ 113,738,000 $ 121,825,000
Quebec Silicon General Partner        
Proportion of ownership interest in subsidiary   51.00%    
WVA Manufacturing, LLC        
Additional cost per operating agreement $ 100      
Non-controlling interests   $ 51,936,000 65,576,000  
WVA Manufacturing, LLC | Globe Specialty Metals Inc        
Production output sold (as a percentage) 51.00%      
WVA Manufacturing, LLC | Dow Corning Corporation        
Production output sold (as a percentage) 49.00%      
WVA Manufacturing, LLC | Dow Corning Corporation | Globe Specialty Metals Inc        
Membership interest sold (as a percentage) 49.00%      
Quebec Silicon Limited Partnership        
Additional cost per operating agreement   50    
Non-controlling interests   $ 49,184,000 $ 45,938,000  
Quebec Silicon Limited Partnership | Globe Specialty Metals Inc        
Production output sold (as a percentage)   51.00%    
Quebec Silicon Limited Partnership | Dow Corning Corporation        
Production output sold (as a percentage)   49.00%