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Revenue
 9 Months Ended
Sep. 30, 2025
Revenue Recognition and Deferred Revenue [Abstract]  
Revenue
3.    Revenue
We enter into contracts to sell mainly primary aluminum to our customers. Revenue is recognized when our performance obligations with our customers are satisfied. Our obligations under the contracts are satisfied when we transfer control of our primary aluminum to our customers which is generally upon shipment or delivery to customer directed locations. For aluminum, the amount of consideration we receive, thus the revenue we recognize, is a function of volume delivered, market price of primary aluminum, which is based on the LME, plus regional premiums and any value-added product premiums. For alumina, consideration is based on the alumina pricing index, plus Atlantic differential.
The payment terms and conditions in our contracts vary and are not significant to our revenue. We complete an appropriate credit evaluation for each customer at contract inception. Customer payments are due in arrears and are recognized as Accounts receivable - net and Due from affiliates in our Consolidated Balance Sheets.
In connection with our sales agreements with certain customers, including Glencore, we invoice the customer prior to physical shipment of goods for a majority of production generated from each of our U.S. domestic smelters. For those sales, revenue is recognized only when the customer has specifically requested such treatment and has made a commitment to
purchase the product. The goods must be complete, ready for shipment and separated from other inventory with control over the goods passing to the customer. We must retain no further performance obligations.
Contract liabilities are recorded when cash payments are received or due in advance of performance. Amounts recognized in Due to affiliates was $41.4 million and $41.2 million, as of September 30, 2025 and December 31, 2024, respectively.
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 and nine months ended September 30, 2025 and 2024.
Net SalesThree months ended
September 30,		Nine months ended
September 30,
2025202420252024
Aluminum$573.5 $489.6 $1,677.9 $1,393.9 
Alumina58.7 49.5 216.3 195.5 
Total$632.2 $539.1 $1,894.2 $1,589.4 
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
September 30,		Nine months ended
September 30,
 2025202420252024
United States$435.8 $336.3 $1,241.4 $1,011.2 
Iceland196.4 202.8 652.8 578.2 
Total Net sales
$632.2 $539.1 $1,894.2 $1,589.4 
(1)Includes sales of primary aluminum, scrap aluminum and alumina, and purchased aluminum and alumina.