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Debt - Casthouse and Surety (Details)
€ in Millions
1 Months Ended
Nov. 30, 2021
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
EUR (€)
Dec. 31, 2022
USD ($)
Dec. 09, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Casthouse Facility            
Debt Instrument [Line Items]            
Debt instrument, term 8 years          
Credit facility maximum amount $ 130,000,000          
Debt instrument, quarterly installment fee 1.739%          
Debt instrument, remaining payment after drawdown of funds 60.00%          
Medium-term notes, outstanding borrowings   $ 86,900,000        
Casthouse Facility | Iceland revolving line of credit            
Debt Instrument [Line Items]            
Secured debt   86,200,000   $ 49,400,000    
Medium-term Notes            
Debt Instrument [Line Items]            
Credit facility maximum amount | €           € 13.6
Medium-term Notes | EURIBOR            
Debt Instrument [Line Items]            
Long-term debt due to affiliates   $ 4,800,000 € 4.5      
Iceland term facility | Iceland revolving line of credit            
Debt Instrument [Line Items]            
Stated interest rate, percentage   3.20% 3.20%      
Secured debt   $ 0   1,200,000    
Vlissingen facility agreement | Secured Debt | Vlissingen            
Debt Instrument [Line Items]            
Face amount         $ 90,000,000  
Vlissingen facility agreement | Iceland revolving line of credit            
Debt Instrument [Line Items]            
Stated interest rate, percentage   8.75% 8.75%      
Secured debt   $ 10,000,000.0   $ 0    
Surety Bond            
Debt Instrument [Line Items]            
Loss contingency accrual   $ 6,600,000