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Revenue
 6 Months Ended
Jun. 30, 2020
Revenue Recognition and Deferred Revenue [Abstract]  
Revenue RevenueWe disaggregate our revenue by geographical region as follows:
Net Sales
Three months ended June 30,
Six months ended June 30,
2020
2019
2020
2019
United States$247.9  $309.5  $522.0  $634.8  
Iceland154.0  163.6  301.1  328.4  
Total$401.9  $473.1  $823.1  $963.2  
Trade accounts receivable - net as of June 30, 2020 decreased by $34.2 million from December 31, 2019 due to a decrease in sales resulting from lower regional premiums and realized LME prices, and timing of receivable collections.