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Derivatives, Hedging Programs and Other Financial Instruments - Summary of Derivative Positions (Details) Mmlb in Millions | 9 Months Ended
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Sep. 30, 2022 EUR (€) Mmlb MWh MMBTU
Purchase | Natural Gas |
Derivative [Line Items] |
Derivative non-monetary notional amount | MMBTU | 3,900,000
Purchase | Natural Gas | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Purchase | Natural Gas | Maximum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2025
Purchase | Aluminum |
Derivative [Line Items] |
Derivative non-monetary notional amount | 87.9
Purchase | Aluminum | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Purchase | Aluminum | Maximum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2023
Purchase | Midwest premium swap contracts |
Derivative [Line Items] |
Derivative non-monetary notional amount | 52.3
Purchase | Midwest premium swap contracts | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Purchase | Midwest premium swap contracts | Maximum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2023
Purchase | Alloying Metals |
Derivative [Line Items] |
Derivative non-monetary notional amount | 2.0
Purchase | Alloying Metals | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Purchase | Alloying Metals | Maximum |
Derivative [Line Items] |
Derivative maturity period | Nov. 30, 2023
Purchase | Foreign Exchange Contract |
Derivative [Line Items] |
Derivative notional amount | € | € 1,126,066
Purchase | Foreign Exchange Contract | Minimum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2022
Purchase | Foreign Exchange Contract | Maximum |
Derivative [Line Items] |
Derivative maturity period | Feb. 29, 2024
Purchase | Electricity |
Derivative [Line Items] |
Derivative non-monetary notional amount | MWh | 55,225
Purchase | Electricity | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Purchase | Electricity | Maximum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2022
Sales | Aluminum |
Derivative [Line Items] |
Derivative non-monetary notional amount | 15.0
Sales | Aluminum | Minimum |
Derivative [Line Items] |
Derivative maturity period | Oct. 31, 2022
Sales | Aluminum | Maximum |
Derivative [Line Items] |
Derivative maturity period | Dec. 31, 2022

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