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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories follow (in millions):
 
June 30, 2016
 
December 31, 2015
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
159.8

 
$
18.5

 
$
141.3

 
$
221.5

 
$
33.1

 
$
188.4

Uranium
41.2

 
21.0

 
20.2

 
97.5

 
73.7

 
23.8

Materials and supplies
0.2

 
—

 
0.2

 
0.2

 
—

 
0.2

 
$
201.2

 
$
39.5

 
$
161.7

 
$
319.2

 
$
106.8

 
$
212.4



(a)
Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators.