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Segment Information Segment Information (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting [Abstract] |  |
Revenue from top 10 customers | 95.00%leu_Revenuefromtop10customers |
Revenue from top 3 customers | 62.00%leu_Revenuefromtop3customers |
Revenue from first customer over 10 percent | 31.00%leu_Revenuefromfirstcustomerover10percent |
Revenue from second customer over 10 percent | 18.00%leu_Revenuefromsecondcustomerover10percent |
Revenue from third customer over 10 percent | 13.00%leu_Revenuefromthirdcustomerover10percent |
Revenue from fourth customer over 10 percent |  | 20.00%leu_Revenuefromfourthcustomerover10percent

X
- Definition Revenue from first customer over 10 percent + References No definition available. + Details
Name: | leu_Revenuefromfirstcustomerover10percent
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from fourth customer over 10 percent + References No definition available. + Details
Name: | leu_Revenuefromfourthcustomerover10percent
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from second customer over 10 percent + References No definition available. + Details
Name: | leu_Revenuefromsecondcustomerover10percent
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from third customer over 10 percent + References No definition available. + Details
Name: | leu_Revenuefromthirdcustomerover10percent
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from top 10 customers + References No definition available. + Details
Name: | leu_Revenuefromtop10customers
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from top 3 customers + References No definition available. + Details
Name: | leu_Revenuefromtop3customers
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration