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Subsequent events
 12 Months Ended
Dec. 31, 2022
Subsequent Events [Abstract]  
Subsequent events Subsequent eventsOn January 17, 2023, our wholly owned subsidiary, Mt. Holly Commerce Park LLC, entered into a binding agreement, subject to ordinary course conditions, to sell approximately 133 acres of land for approximately $28.5 million. We previously formed the commerce park, located near our Mt. Holly smelter, to develop excess land at the site and to assist the county with bringing additional business and commerce to the area.