Business Segments

12 Months Ended

Dec. 31, 2018

Century 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⁾	2018		2017		2016
Primary	$	1,480.7	$	1,531.0	$	1,493.0
Corporate, unallocated	56.8		50.6		47.3
Total assets	$	1,537.5	$	1,581.6	$	1,540.3


⁽¹⁾	Segment assets include accounts receivable, due from affiliates, prepaid and other current 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:



	2018		2017		2016
Net sales:
United States	$	1,138.6	$	938.4	$	808.9
Iceland	754.6		650.7		510.2
Long-lived assets: ⁽¹⁾
United States	$	396.0	$	370.0	$	395.1
Iceland	554.3		583.0		625.9
Other	76.5		75.0		78.7


⁽¹⁾	Includes long-lived assets other than financial instruments and deferred taxes.

Major customer information

In 2018, revenues from two customers exceeded 10% of our net sales compared to one customer in 2017 and 2016. 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,
	2018		2017		2016
Glencore	$	1,204.5	$	1,198.1	$	1,178.6
Southwire	222.4		77.2		—