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Property, Plant and Equipment Property, Plant and Equipment (Tables) | 6 Months Ended
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Jun. 30, 2014
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | A summary of changes in property, plant and equipment follows (in millions):
| December 31, 2013 |  | Capital Expenditures (Depreciation) |  | Retirements |  | June 30, 2014
Leasehold improvements | $ | 141.1 |  |  | $ | — |  |  | $ | (116.6 | ) |  | $ | 24.5 |
Machinery and equipment | 164.0 |  |  | — |  |  | (51.2 | ) |  | 112.8 |
| 305.1 |  |  | — |  |  | (167.8 | ) |  | 137.3 |
Accumulated depreciation and amortization | (297.2 | ) |  | (3.8 | ) |  | 167.6 |  |  | (133.4 | )
| $ | 7.9 |  |  | $ | (3.8 | ) |  | $ | (0.2 | ) |  | $ | 3.9 |
During 2014, USEC entered into a commission sales agreement with a third-party auctioneer to assist in Paducah GDP asset disposals. Two auctions were held during the second quarter of 2014. Other income includes sales of $1.3 million less asset retirements and related sales expense. Cash proceeds totaled $0.4 million. Additional sales of assets and property are planned for the remainder of 2014.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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