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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Reconciliation of assets from segment to consolidated | A reconciliation of our consolidated assets to the total of primary aluminum segment assets is provided below.
Segment assets (1) | 2020 |  | 2019 |  | 2018
Primary | $ | 1,332.0 |  |  | $ | 1,433.7 |  |  | $ | 1,480.7 |
Corporate, unallocated | 67.6 |  |  | 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.
Schedule of revenue from external customers and long-lived assets, by geographical areas | Included in the consolidated financial statements are the following amounts related to geographic locations:
| 2020 |  | 2019 |  | 2018
Net sales: (1) |  |  |  |  |
United States | $ | 1,007.5 |  |  | $ | 1,179.6 |  |  | $ | 1,138.6 |
Iceland | 597.6 |  |  | 657.0 |  |  | 754.6 |
Long-lived assets: (2) |  |  |  |  |
United States | $ | 363.3 |  |  | $ | 419.1 |  |  | $ | 396.0 |
Iceland | 511.8 |  |  | 518.0 |  |  | 554.3 |
Other | 68.6 |  |  | 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.
Schedule of revenue by major customers by reporting segments | 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,
| 2020 |  | 2019 |  | 2018
Glencore | $ | 1,025.5 |  |  | $ | 1,191.6 |  |  | $ | 1,204.5 |
Southwire | 195.9 |  |  | 235.4 |  |  | 222.4 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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