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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2025
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 and nine months ended September 30, 2025 and 2024.
Net Sales |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Aluminum |  | $ | 573.5 |  |  | $ | 489.6 |  |  | $ | 1,677.9 |  |  | $ | 1,393.9 |
Alumina |  | 58.7 |  |  | 49.5 |  |  | 216.3 |  |  | 195.5 |
Total |  | $ | 632.2 |  |  | $ | 539.1 |  |  | $ | 1,894.2 |  |  | $ | 1,589.4 |
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 September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
United States |  | $ | 435.8 |  |  | $ | 336.3 |  |  | $ | 1,241.4 |  |  | $ | 1,011.2 |
Iceland |  | 196.4 |  |  | 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.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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