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Basis of Presentation (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Sep. 30, 2014
Reduction in amount of third party debt obligations |  | 55.00%
Gain on sale of subsidiary | $ 35.6 |

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- Definition Reduction in amount of third party debt obligations + References No definition available. + Details
Name: | leu_Reductioninamountofthirdpartydebtobligations
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
Name: | us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration