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Derivatives - Narrative (Details)
€ in Millions, kr in Millions
12 Months Ended
Dec. 31, 2023
DKK (kr)
MMBTU
MWh
Boe
t
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Supply Commitment [Line Items]        
Restricted cash | $     $ 0 $ 0
LME forward financial sales contracts        
Supply Commitment [Line Items]        
Open position to offset fixed prices | t 36,633      
Fixed to Floating Swap        
Supply Commitment [Line Items]        
Open position to offset fixed prices | t 318      
Nord Pool Swaps | Nordural Grundartangi ehf        
Supply Commitment [Line Items]        
Derivative liability (in MwH) | MWh 0      
Indiana Hub Power Price Swaps        
Supply Commitment [Line Items]        
Derivative liability (in MwH) | MWh 0      
USD ISK Forward Swap | Not Designated as Hedging Instrument | Short        
Supply Commitment [Line Items]        
Derivative, forward contracts | kr kr 397.0      
USD Euro Forward Swap | Not Designated as Hedging Instrument | Short        
Supply Commitment [Line Items]        
Derivative, forward contracts | €   € 1.8    
Henry Hub Natural Gas Price Swaps        
Supply Commitment [Line Items]        
Derivative liability (in MwH) | MMBTU 0      
HFO Price Swaps        
Supply Commitment [Line Items]        
Derivative liability (in MwH) | Boe 180,000