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Inventories | 3 Months Ended
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Mar. 31, 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):
| March 31, 2016 |  | December 31, 2015
| Current Assets |  | Current Liabilities (a) |  | Inventories, Net |  | Current Assets |  | Current Liabilities (a) |  | Inventories, Net
Separative work units | $ | 169.9 |  |  | $ | 16.9 |  |  | $ | 153.0 |  |  | $ | 221.5 |  |  | $ | 33.1 |  |  | $ | 188.4 |
Uranium | 41.2 |  |  | 31.0 |  |  | 10.2 |  |  | 97.5 |  |  | 73.7 |  |  | 23.8 |
Materials and supplies | 0.2 |  |  | — |  |  | 0.2 |  |  | 0.2 |  |  | — |  |  | 0.2 |
| $ | 211.3 |  |  | $ | 47.9 |  |  | $ | 163.4 |  |  | $ | 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. In the three months ended March 31, 2016, a valuation adjustment of $0.5 million was charged to cost of sales 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 $0.4 billion as of March 31, 2016 and 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. 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. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 + Details
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