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Inventories | 6 Months Ended
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Jun. 30, 2016
Inventory, Net [Abstract] |
Inventories | INVENTORIES Centrus holds uranium at licensed locations in the form of natural uranium and as the uranium component of low enriched uranium (“LEU”). Centrus also holds separative work units (“SWU”) as the SWU component of LEU at licensed locations (e.g., fabricators) to meet book transfer requests by customers. Fabricators process LEU into fuel for use in nuclear reactors. Components of inventories follow (in millions):
| June 30, 2016 |  | December 31, 2015
| Current Assets |  | Current Liabilities (a) |  | Inventories, Net |  | Current Assets |  | Current Liabilities (a) |  | Inventories, Net
Separative work units | $ | 159.8 |  |  | $ | 18.5 |  |  | $ | 141.3 |  |  | $ | 221.5 |  |  | $ | 33.1 |  |  | $ | 188.4 |
Uranium | 41.2 |  |  | 21.0 |  |  | 20.2 |  |  | 97.5 |  |  | 73.7 |  |  | 23.8 |
Materials and supplies | 0.2 |  |  | — |  |  | 0.2 |  |  | 0.2 |  |  | — |  |  | 0.2 |
| $ | 201.2 |  |  | $ | 39.5 |  |  | $ | 161.7 |  |  | $ | 319.2 |  |  | $ | 106.8 |  |  | $ | 212.4 |
(a) | Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators.
Inventories are valued at the lower of cost or net realizable value. Valuation adjustments of $0.7 million were charged to cost of sales in the six months ended June 30, 2016, including $0.2 million in the second quarter, for the Company’s uranium inventory to reflect declines in uranium market price indicators. Uranium Provided by Customers and Suppliers Centrus held uranium with estimated values of approximately $242 million as of June 30, 2016, and $437 million as of December 31, 2015, to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet. The reduction reflects a 28% decline in quantities and a 23% decline in uranium spot price indicators. 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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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