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Debt - Casthouse Facility Narrative (Details)
€ in Millions
Nov. 02, 2021
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
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   $ 130,000,000      
Casthouse Facility | Iceland revolving line of credit          
Debt Instrument [Line Items]          
Stated interest rate, percentage   8.84%      
Secured debt   $ 119,800,000 $ 98,800,000    
Medium-term Notes          
Debt Instrument [Line Items]          
Credit facility maximum amount | €         € 13.6
Iceland Term Facility | Iceland revolving line of credit          
Debt Instrument [Line Items]          
Stated interest rate, percentage   3.20%      
Vlissingen facility agreement | Iceland revolving line of credit          
Debt Instrument [Line Items]          
Stated interest rate, percentage   8.75%      
Face amount       $ 90,000,000  
Secured debt   $ 10,000,000      
Industrial revenue bonds, variable          
Debt Instrument [Line Items]          
Maximum variable interest rate   12.00%      
Surety Bond          
Debt Instrument [Line Items]          
Loss contingency accrual   $ 6,600,000