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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories follow (in millions):
 
June 30, 2018
 
December 31, 2017
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
7.3

 
$
3.8

 
$
3.5

 
$
47.2

 
$
15.0

 
$
32.2

Uranium
92.7

 
41.3

 
51.4

 
105.9

 
62.9

 
43.0

 
$
100.0

 
$
45.1

 
$
54.9

 
$
153.1

 
$
77.9

 
$
75.2



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