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Inventories
12 Months Ended
Dec. 31, 2015
Inventory, Net [Abstract]  
Inventories
INVENTORIES

Centrus holds natural uranium and the uranium and SWU components of LEU at licensed locations. Components of inventories follow (in millions):
 
December 31, 2015
 
December 31, 2014
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
221.5

 
$
33.1

 
$
188.4

 
$
330.6

 
$
76.6

 
$
254.0

Uranium
97.5

 
73.7

 
23.8

 
131.4

 
82.3

 
49.1

Materials and supplies
0.2

 

 
0.2

 
0.2

 

 
0.2

 
$
319.2

 
$
106.8

 
$
212.4

 
$
462.2

 
$
158.9

 
$
303.3



(a)
Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators that process LEU into fuel for use in nuclear reactors.

In 2015, Centrus exchanged SWU for uranium under a barter contract. SWU revenue of $8.3 million was recognized based on the fair market value of the uranium acquired in exchange for SWU delivered.

Uranium Provided by Customers and Suppliers

Centrus held uranium with estimated values of approximately $0.4 billion as of December 31, 2015 and $0.6 billion as of December 31, 2014 to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet. While in some cases Centrus sells both the SWU and uranium components of LEU to customers, utility customers typically provide uranium to Centrus as part of their enrichment contracts. Title to uranium provided by customers generally remains with the customer until delivery of LEU at which time title to LEU is transferred to the customer and title to uranium is transferred to Centrus.