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Business Segments | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Business Segments | Business Segments Century Aluminum is a producer of primary aluminum, which trades as a global commodity, and owns a 55% interest in a bauxite mining and alumina refinery joint venture. We are organized as a holding company with each of our operating primary aluminum smelters managed and operated as a separate facility reporting to our corporate headquarters. Each of our operating primary aluminum smelters and our bauxite and alumina refinery meets the definition of an operating segment. We evaluated the similar economic and other characteristics, including nearly identical products, production processes, customers and distribution and have aggregated our five operating segments into one reportable segment, primary aluminum, based on these factors. In addition, all of our operating segments share several key economic factors inherent in their common products and production processes. For example, all of our facilities' revenue is based on market pricing. Our facilities have a similar customer base and utilize similar distribution methods to ship products. A reconciliation of our consolidated assets to the total of primary aluminum segment assets is provided below.
Segment assets (1) | 2023 |  | 2022 |  | 2021
Primary | $ | 1,808.1 |  |  | $ | 1,432.4 |  |  | $ | 1,513.3 |
Corporate, unallocated | 38.4 |  |  | 39.6 |  |  | 56.6 |
Total assets | $ | 1,846.5 |  |  | $ | 1,472.0 |  |  | $ | 1,569.9 |
(1)Segment assets include accounts receivable, due from affiliates, prepaid and other current assets, leases - right of use assets, inventory, intangible assets and property, plant and equipment, net; the remaining assets are unallocated corporate assets. Geographic information Our net sales are attributed to geographic area based on the location of the selling operation. Included in the consolidated financial statements are the following amounts related to geographic locations:
| 2023 |  | 2022 |  | 2021
Net sales: (1) |  |  |  |  |
United States | $ | 1,358.6 |  |  | $ | 1,737.2 |  |  | $ | 1,413.0 |
Iceland | 826.8 |  |  | 1,040.1 |  |  | 799.5 |
Long-lived assets: (2) |  |  |  |  |
United States | $ | 219.1 |  |  | $ | 244.9 |  |  | $ | 400.1 |
Iceland | 529.4 |  |  | 491.0 |  |  | 490.1 |
Jamaica | 275.8 |  |  | — |  |  | — |
Other | 55.1 |  |  | 58.3 |  |  | 61.5 |
(1)Includes sales of primary aluminum, scrap aluminum and alumina, and purchased aluminum and alumina. (2)Includes long-lived assets other than financial instruments and deferred taxes. Major customer information Revenues from one customer in 2023 and two customers in 2022 and 2021 exceeded 10% of our net sales . A loss of these customers could have a material adverse effect on our results of operations. The net sales related to the customers is as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Glencore | $ | 1,612.1 |  |  | $ | 1,671.1 |  |  | $ | 1,337.0 |
Southwire | — |  |  | 331.3 |  |  | 304.6 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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