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Environmental Compliance (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Environmental Compliance [Abstract] |  |
Accrued liabilities for stored wastes | $ 1.8 | $ 2.1
Accrued lease turnover - Paducah, current | 30.4 | 32.2
Accrued lease turnover - Paducah, noncurrent |  | 10.3
Accrued lease turnover - Portsmouth, current | 5.5 | 6.7
ARO financial assurance | 29.4 |
ARO financial assurance - increase | 6.4 |
Expense of American Centrifuge capital assets - ARO |  | 19.3
Asset Retirement Obligation | $ 22.6 |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Details
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