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Inventories | 12 Months Ended
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Dec. 31, 2016
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, 2016 |  | December 31, 2015
| Current Assets |  | Current Liabilities (a) |  | Inventories, Net |  | Current Assets |  | Current Liabilities (a) |  | Inventories, Net
Separative work units | $ | 115.8 |  |  | $ | 15.2 |  |  | $ | 100.6 |  |  | $ | 221.5 |  |  | $ | 33.1 |  |  | $ | 188.4 |
Uranium | 61.4 |  |  | 42.3 |  |  | 19.1 |  |  | 97.5 |  |  | 73.7 |  |  | 23.8 |
Materials and supplies | 0.2 |  |  | — |  |  | 0.2 |  |  | 0.2 |  |  | — |  |  | 0.2 |
| $ | 177.4 |  |  | $ | 57.5 |  |  | $ | 119.9 |  |  | $ | 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 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.

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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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