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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |
Allowance for expected losses | $ 0.5 | $ 1.0
Hawesville |  |
Property, Plant and Equipment [Line Items] |  |
Production capacity | 75.00% |
Minimum | Building and Improvements |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 10 years |
Minimum | Machinery and Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 5 years |
Minimum | Technology and Software |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 3 years |
Maximum | Building and Improvements |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 45 years |
Maximum | Machinery and Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 35 years |
Maximum | Technology and Software |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 7 years |
Glencore |  |
Schedule of Equity Method Investments [Line Items] |  |
Glencore beneficial ownership | 42.90% |
Glencore economic ownership | 46.10% |

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