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Revenue (Tables)
 3 Months Ended
Mar. 31, 2026
Revenue Recognition and Deferred Revenue [Abstract]  
Schedule of Disaggregation of Revenue
The table below shows the amount of net sales to external customers for each of the Company's product categories which accounted for 10% or more of consolidated net sales in either period for the three months ended March 31, 2026 and 2025.
Net SalesThree months ended
March 31,
20262025
Aluminum$587.9 $535.8 
Alumina61.3 98.1 
Total$649.2 $633.9 
Schedule of Revenue by Geographic Area
Our net sales are attributed to geographic area based on the location of the selling entity. Included in the consolidated financial statements are the following amounts related to geographic locations:
Net Sales(1)
Three months ended
March 31,
 20262025
United States$561.9 $413.8 
Iceland87.3 220.1 
Total$649.2 $633.9 
(1)Includes sales of primary aluminum, scrap aluminum and alumina, and purchased aluminum and alumina.