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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2018
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Reporting Information
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
Revenue
 
 
 
 
 
 
 
LEU Segment:
 
 
 
 
 
 
 
Separative work units
$
17.6

 
$
43.5

 
$
68.2

 
$
82.2

Uranium
11.3

 
—

 
14.9

 
—

Total
28.9

 
43.5

 
83.1

 
82.2

Contract Services Segment
5.2

 
6.8

 
26.1

 
19.3

Total revenue
$
34.1

 
$
50.3

 
$
109.2

 
$
101.5

 
 
 
 
 
 
 
 
Segment Gross Profit (Loss)
 
 
 
 
 
 
 
LEU Segment
$
8.0

 
$
10.8

 
$
(15.5
)
 
$
4.3

Contract Services Segment
(0.2
)
 
0.5

 
7.3

 
(0.6
)
Gross profit (loss)
$
7.8

 
$
11.3

 
$
(8.2
)
 
$
3.7