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Property, Plant and Equipment Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2013
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | 7. PROPERTY, PLANT AND EQUIPMENT A summary of changes in property, plant and equipment follows (in millions):
| December 31, 2012 |  | Capital Expenditures (Depreciation) |  | Transfers and Retirements |  | Ceasing of Enrichment at Paducah |  | September 30, 2013
Construction work in progress | $ | 2.7 |  |  | $ | — |  |  | $ | (0.6 | ) |  | $ | (1.7 | ) |  | $ | 0.4 |
Leasehold improvements | 183.7 |  |  | — |  |  | (42.3 | ) |  | — |  |  | 141.4 |
Machinery and equipment | 181.7 |  |  | — |  |  | (15.0 | ) |  | — |  |  | 166.7 |
| 368.1 |  |  | — |  |  | (57.9 | ) |  | (1.7 | ) |  | 308.5 |
Accumulated depreciation and amortization | (317.1 | ) |  | (16.2 | ) |  | 55.4 |  |  | (17.6 | ) |  | (295.5 | )
| $ | 51.0 |  |  | $ | (16.2 | ) |  | $ | (2.5 | ) |  | $ | (19.3 | ) |  | $ | 13.0 |
As noted in Note 3, USEC incurred a charge to cost of sales of $19.3 million in the nine months ended September 30, 2013 in connection with the ceasing of enrichment at the Paducah GDP and the related retirements of property, plant and equipment used in the enrichment process.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 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 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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