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Derivatives, Hedging Programs and Other Financial Instruments - Summary of Derivative Positions (Details) - 12 months ended Dec. 31, 2022 - Purchase Mmlb in Millions | EUR (€) Mmlb MMBTU | GBP (£) Mmlb MMBTU
--- | --- | ---
Natural Gas |  |
Derivative [Line Items] |  |
Derivative non-monetary notional amount | MMBTU | 3,480,000 | 3,480,000
Natural Gas | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | Jan. 31, 2023 |
Natural Gas | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Dec. 31, 2025 |
British Pounds |  |
Derivative [Line Items] |  |
Derivative notional amount | £ |  | £ 202,128
British Pounds | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | May 31, 2023 |
British Pounds | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Sep. 30, 2023 |
Aluminum |  |
Derivative [Line Items] |  |
Derivative non-monetary notional amount | 63.0 | 63.0
Aluminum | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | Jan. 31, 2023 |
Aluminum | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Feb. 29, 2024 |
Midwest premium swap contracts |  |
Derivative [Line Items] |  |
Derivative non-monetary notional amount | 63.0 | 63.0
Midwest premium swap contracts | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | Jan. 31, 2023 |
Midwest premium swap contracts | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Feb. 29, 2024 |
Alloying Metals |  |
Derivative [Line Items] |  |
Derivative non-monetary notional amount | 1.2 | 1.2
Alloying Metals | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | Jan. 31, 2023 |
Alloying Metals | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Nov. 30, 2023 |
Euros |  |
Derivative [Line Items] |  |
Derivative notional amount | € | € 908,441 |
Euros | Minimum |  |
Derivative [Line Items] |  |
Derivative maturity period | Mar. 31, 2023 |
Euros | Maximum |  |
Derivative [Line Items] |  |
Derivative maturity period | Feb. 29, 2024 |

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