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Property, Plant and Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Property, Plant and Equipment |  |
Capital expenditures for American Centrifuge Project | $ 1,100.0 | $ 1,100.0
Capitalized asset retirement obligations | 19.3 | 19.3
Transfer of machinery and equipment to U.S. Department of Energy | 44.6 |
Transfer from CWIP to depreciating assets | 303.1 |
Transfer from prepaid assets to depreciating assets | 12.3 |
Previously capitalized CWIP expensed | $ 2.8 |

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- Definition The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 37, 41, 42, 43, 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -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 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition Cumulative capital expenditures for American Centrifuge Project + References No definition available. + Details
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- Definition Capitalized asset retirement obligations + References No definition available. + Details
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- Definition Transfer from CWIP to depreciating assets (leashold improvements, machinery and equipment + References No definition available. + Details
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