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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory, Net [Abstract]  
Schedule of Inventories
 
December 31, 2017
 
December 31, 2016
( in millions)
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
 
 
 
 
 
 
 
 
 
 
 
Separative work units
$
47.2

 
$
15.0

 
$
32.2

 
$
115.8

 
$
15.2

 
$
100.6

Uranium
105.9

 
62.9

 
43.0

 
61.4

 
42.3

 
19.1

Materials and supplies
—

 
—

 
—

 
0.2

 
—

 
0.2

 
$
153.1

 
$
77.9

 
$
75.2

 
$
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 that process LEU into fuel for use in nuclear reactors.