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Revenue (Tables)
6 Months Ended
Jun. 30, 2018
Revenue Recognition and Deferred Revenue [Abstract]  
Disaggregation of revenue
We disaggregate our revenue by geographical region as follows:
Net Sales
 
For the three months ended June 30, 2018
 
For the six months ended June 30, 2018
United States
 
$
279.4

 
$
547.6

Iceland
 
190.6

 
376.9

Total
 
$
470.0

 
$
924.5