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%