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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Reporting Information
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2013
 
2012
 
2013
 
2012
 
(millions)
Revenue
 
 
 
 
 
 
 
LEU segment:
 
 
 
 
 
 
 
Separative work units
$
267.4

 
$
347.2

 
$
557.6

 
$
885.1

Uranium
13.9

 
3.6

 
41.5

 
3.6

 
281.3

 
350.8

 
599.1

 
888.7

Contract services segment
3.5

 
3.0

 
6.1

 
7.1

 
$
284.8

 
$
353.8

 
$
605.2

 
$
895.8

 
 
 
 
 
 
 
 
Segment Gross Profit (Loss)
 

 
 

 
 
 
 
LEU segment
$
(46.9
)
 
$
10.4

 
$
(32.9
)
 
$
47.1

Contract services segment
—

 
(0.2
)
 
(0.7
)
 
(0.2
)
Gross profit (loss)
$
(46.9
)
 
$
10.2

 
$
(33.6
)
 
$
46.9