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Revenue (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2025 and 2024.
Net Sales |  | Three months ended June 30, |  | Six months ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Aluminum |  | $ | 568.6 |  |  | $ | 454.9 |  |  | $ | 1,104.4 |  |  | $ | 904.3 |
Alumina |  | 59.5 |  |  | 105.9 |  |  | 157.6 |  |  | 146.0 |
Total |  | $ | 628.1 |  |  | $ | 560.8 |  |  | $ | 1,262.0 |  |  | $ | 1,050.3 |
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:
| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Net sales: (1) |  |  |  |  |  |  |
United States | $ | 391.8 |  |  | $ | 375.0 |  |  | 805.6 |  |  | $ | 675.0 |
Iceland | 236.3 |  |  | 185.8 |  |  | $ | 456.4 |  |  | 375.3 |
Total Net sales | $ | 628.1 |  |  | $ | 560.8 |  |  | $ | 1,262.0 |  |  | $ | 1,050.3 |
(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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