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Business Segments
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Business Segments Business SegmentsCentury Aluminum is a producer of primary aluminum, which trades as a global commodity. 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 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 four operating segments into one reportable segment, primary aluminum, based on these factors. In addition, all of our primary aluminum smelters share several key economic factors inherent in their common products and production processes. For example, all of our facilities' revenue is based on the LME price for primary aluminum.
A reconciliation of our consolidated assets to the total of primary aluminum segment assets is provided below.
Segment assets (1)
202020192018
Primary$1,332.0 $1,433.7 $1,480.7 
Corporate, unallocated67.6 66.0 56.8 
Total assets$1,399.6 $1,499.7 $1,537.5 
(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
Included in the consolidated financial statements are the following amounts related to geographic locations:
 202020192018
Net sales: (1)
   
United States$1,007.5 $1,179.6 $1,138.6 
Iceland597.6 657.0 754.6 
Long-lived assets: (2)
   
United States$363.3 $419.1 $396.0 
Iceland511.8 518.0 554.3 
Other68.6 75.3 76.5 
(1)Includes sales of primary aluminum, scrap aluminum and alumina.
(2)Includes long-lived assets other than financial instruments and deferred taxes.
Major customer information
In 2020, revenues from two customers exceeded 10% of our net sales compared to two customers in 2019 and 2018.  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,
 202020192018
Glencore$1,025.5 $1,191.6 $1,204.5 
Southwire195.9 235.4 222.4