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Segment Information (Tables)
6 Months Ended
Jun. 30, 2019
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents revenue from separative work units (“SWU”) and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
United States
$
2.6

 
$
32.9

 
$
37.7

 
$
54.0

Foreign

 

 

 
0.2

Revenue - SWU and uranium
$
2.6

 
$
32.9

 
$
37.7

 
$
54.2

Segment Reporting Information
The following table presents the Company’s segment information (in millions):

 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Revenue
 
 
 
 
 
 
 
LEU segment:
 
 
 
 
 
 
 
Separative work units
$

 
$
32.9

 
$
12.4

 
$
50.6

Uranium
2.6

 

 
25.3

 
3.6

Total
2.6

 
32.9

 
37.7

 
54.2

Contract services segment
8.0

 
6.5

 
11.6

 
20.9

Total revenue
$
10.6

 
$
39.4

 
$
49.3

 
$
75.1

 
 
 
 
 
 
 
 
Segment Gross Profit (Loss)
 
 
 
 
 
 
 
LEU segment
$
(5.1
)
 
$
(10.0
)
 
$
(8.3
)
 
$
(23.5
)
Contract services segment
0.8

 
(0.7
)
 
(1.5
)
 
7.5

Gross loss
$
(4.3
)
 
$
(10.7
)
 
$
(9.8
)
 
$
(16.0
)


Revenue from Major Customers (10% or More of Total Revenue)

In the three months ended June 30, 2019, one customer in the LEU segment represented $2.6 million of revenue and one customer in the contract services segment represented $6.3 million of revenue. In the six months ended June 30, 2019, one customer in the LEU segment represented $35.0 million of revenue and one customer in the contract services segment represented $8.7 million of revenue.

In the three months ended June 30, 2018, individual customers in the LEU segment represented $18.6 million and $14.3 million of revenue, and one customer in the contract services segment represented $4.5 million of revenue. In the six months ended June 30, 2018, individual customers in the LEU segment represented $30.7 million and $14.4 million of revenue, and individual customers in the contract services segment represented $9.9 million and $9.2 million of revenue.