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Business Segments
 12 Months Ended
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)
202320222021
Primary$1,808.1 $1,432.4 $1,513.3 
Corporate, unallocated38.4 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:
 202320222021
Net sales: (1)
   
United States$1,358.6 $1,737.2 $1,413.0 
Iceland826.8 1,040.1 799.5 
Long-lived assets: (2)
   
United States$219.1 $244.9 $400.1 
Iceland529.4 491.0 490.1 
Jamaica275.8 — — 
Other55.1 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,
202320222021
Glencore$1,612.1 $1,671.1 $1,337.0 
Southwire— 331.3 304.6