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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Reporting Information
 
Three Months Ended 
 March 31,
 
2017
 
2016
 
(in millions)
Revenue
 
 
 
LEU segment:
 
 
 
Separative work units
$
0.8

 
$
59.3

Uranium
—

 
14.3

 
0.8

 
73.6

Contract services segment
6.4

 
16.4

Revenue
$
7.2

 
$
90.0

 
 
 
 
Segment Gross Profit (Loss)
 

 
 

LEU segment
$
(1.5
)
 
$
8.1

Contract services segment
(1.0
)
 
7.7

Gross profit (loss)
$
(2.5
)

$
15.8