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Debt - Casthouse and Surety (Details)
€ in Millions
1 Months Ended
Nov. 30, 2021
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
EUR (€)
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   $ 70,000,000      
Medium-term Notes          
Debt Instrument [Line Items]          
Credit facility maximum amount | €         € 13.6
Medium-term Notes | EURIBOR          
Debt Instrument [Line Items]          
Outstanding borrowings   $ 8,600,000 € 8.0    
Iceland term facility | Iceland revolving line of credit          
Debt Instrument [Line Items]          
Stated interest rate, percentage   3.20% 3.20%    
Vlissingen facility agreement | Secured Debt | Vlissingen          
Debt Instrument [Line Items]          
Face amount       $ 90,000,000  
Surety Bond          
Debt Instrument [Line Items]          
Loss contingency accrual   $ 6,600,000