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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories follow (in millions):
 
June 30, 2017
 
December 31, 2016
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
69.1

 
$
10.8

 
$
58.3

 
$
115.8

 
$
15.2

 
$
100.6

Uranium
34.7

 
16.0

 
18.7

 
61.4

 
42.3

 
19.1

Materials and supplies
0.2

 
—

 
0.2

 
0.2

 
—

 
0.2

 
$
104.0

 
$
26.8

 
$
77.2

 
$
177.4

 
$
57.5

 
$
119.9



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