v3.25.2
Debt and Other Obligations - Schedule of Other Short-Term Debt and Obligations (Details)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Debt Instrument [Line Items]        
Repurchase Agreement $ 54,400,000   $ 36,500,000  
Total of Other Short-term Debt and Obligations 330,600,000   250,900,000  
Revolving Credit Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding 35,200,000   0  
Borrowing capacity 351,600,000 € 300,000,000    
Revolving Credit Facility | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Borrowing capacity 274,200,000 € 234,000,000.0 243,100,000 € 234,000,000.0
Revolving Credit Facility | OEC GmbH outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 166,500,000   147,800,000  
Revolving Credit Facility | OEC LLC outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 20,100,000   14,000,000.0  
Revolving Credit Facility | OEC Huaibei outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 19,700,000   16,500,000  
Working Capital Loan | Korea Working Capital Loans (capacity $53.5 million)        
Debt Instrument [Line Items]        
Borrowing capacity 53,500,000      
Working Capital Loan | Korea Working Capital Loans (capacity $53.5 million) | Uncommitted        
Debt Instrument [Line Items]        
Outstanding 1,900,000   1,700,000  
Working Capital Loan | Korea Working Capital Loans (capacity $53.5 million) | Committed        
Debt Instrument [Line Items]        
Outstanding 18,500,000   22,700,000  
Working Capital Loan | China Working Capital Loans (capacity $17.0 million) | China Working Capital Loans (capacity $17.0 million)        
Debt Instrument [Line Items]        
Outstanding 14,300,000   $ 11,700,000  
Borrowing capacity $ 17,000,000.0