v3.26.3
Debt and Other Obligations - Schedule of Other Short-Term Debt and Obligations (Details)
$ in Millions
Sep. 30, 2026
USD ($)
Sep. 30, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Debt Instrument [Line Items]        
Repurchase Agreement $ 19.4   $ 43.0  
Total of Other Short-term Debt and Obligations 320.9   289.8  
Revolving Credit Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding 124.9   58.8  
Borrowing capacity 397.4 € 350,000,000    
Revolving Credit Facility | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Borrowing capacity 265.7 € 234,000,000.0 275.0 € 234,000,000.0
Revolving Credit Facility | OEC GmbH outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 141.9   127.9  
Revolving Credit Facility | OEC LLC outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 2.8   19.4  
Revolving Credit Facility | OEC Huaibei outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 0.0   4.6  
Working Capital Loans | Korea Working Capital Loans (capacity $53.5 million)        
Debt Instrument [Line Items]        
Borrowing capacity 53.5      
Working Capital Loans | Korea Working Capital Loans (capacity $53.5 million) | Uncommitted        
Debt Instrument [Line Items]        
Outstanding 0.0   1.7  
Working Capital Loans | Korea Working Capital Loans (capacity $53.5 million) | Committed        
Debt Instrument [Line Items]        
Outstanding 12.9   17.3  
Working Capital Loans | China Working Capital Loans (capacity $24.9 million) | China Working Capital Loans (capacity $24.9 million)        
Debt Instrument [Line Items]        
Outstanding 19.0   $ 17.1  
Borrowing capacity $ 24.9