Environmental Compliance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
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

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.

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant