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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2013
Inventory, Net [Abstract] |
Schedule of Inventories | Components of inventories follow (in millions):
| December 31, 2013 |  | December 31, 2012
| Current Assets |  | Current Liabilities (a) |  | Inventories, Net |  | Current Assets |  | Current Liabilities (a) |  | Inventories, Net
Separative work units | $ | 628.4 |  |  | $ | 200.0 |  |  | $ | 428.4 |  |  | $ | 880.9 |  |  | $ | 382.7 |  |  | $ | 498.2 |
Uranium | 335.4 |  |  | 299.7 |  |  | 35.7 |  |  | 703.7 |  |  | 567.3 |  |  | 136.4 |
Materials and supplies | 3.8 |  |  | — |  |  | 3.8 |  |  | 8.6 |  |  | — |  |  | 8.6 |
| $ | 967.6 |  |  | $ | 499.7 |  |  | $ | 467.9 |  |  | $ | 1,593.2 |  |  | $ | 950.0 |  |  | $ | 643.2 |
(a) | Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators.

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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