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Derivatives (Details)
€ in Millions
12 Months Ended
Dec. 31, 2021
EUR (€)
MWh
t
LME Swap  
Supply Commitment [Line Items]  
Open position to offset fixed prices 123,216
Midwest Premium (MWP)  
Supply Commitment [Line Items]  
Open position to offset fixed prices 207,000
Fixed to Floating Swap  
Supply Commitment [Line Items]  
Open position to offset fixed prices 8,245
FX Swap  
Supply Commitment [Line Items]  
Derivative asset | € € 42.2
Indiana Hub Power Price Swaps  
Supply Commitment [Line Items]  
Derivative liability (in MwH) | MWh 350,400
Grundartangi | Nordpool Power Price Swap  
Supply Commitment [Line Items]  
Derivative liability (in MwH) | MWh 1,664,400