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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories follow (in millions):
 
September 30, 2018
 
December 31, 2017
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
31.2

 
$
4.7

 
$
26.5

 
$
47.2

 
$
15.0

 
$
32.2

Uranium
98.2

 
65.5

 
32.7

 
105.9

 
62.9

 
43.0

Total
$
129.4

 
$
70.2

 
$
59.2

 
$
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.