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Revenue
9 Months Ended
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.