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Revenue | 9 Months Ended
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Sep. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract] |
Revenue | Revenue We recognize revenue in accordance with ASC 606, “Revenue from Contracts with Customers” and the related amendments (“ASC 606”). We disaggregate our revenue by geographical region as follows:
Net Sales |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
United States |  | $ | 277.1 |  |  | $ | 286.6 |  |  | $ | 911.9 |  |  | $ | 834.2 |
Iceland |  | 160.9 |  |  | 195.2 |  |  | 489.3 |  |  | 572.1 |
Total |  | $ | 438.0 |  |  | $ | 481.8 |  |  | $ | 1,401.2 |  |  | $ | 1,406.3 |
Trade accounts receivable - net as of September 30, 2019 decreased by $10.9 million from December 31, 2018 due to a decrease in sales resulting from lower realized LME prices.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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