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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2016
Inventory, Net [Abstract] |
Schedule of Inventories | 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.

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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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -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 S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: 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)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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