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Segment Information Segment Information (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting [Abstract] |  |
Revenue from top 10 customers | 90.00% |
Revenue from top 4 customers | 50.00% |
Revenue from first customer over 10 percent | 15.00% | 25.00%
Revenue from second customer over 10 percent | 12.00% | 13.00%
Revenue from third customer over 10 percent | 12.00% | 15.00%
Revenue from fourth customer over 10 percent | 11.00% | 10.00%
Assets LEU segment | $ 686.0 | $ 795.3
Assets contract services segment | 27.5 | 24.8
Assets | $ 713.5 | $ 820.1

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- Definition Assets LEU segment + References No definition available. + Details
Name: | leu_AssetsLEUsegment
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Assets contract services segment + References No definition available. + Details
Name: | leu_Assetscontractservicessegment
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Revenue from first customer over 10 percent + References No definition available. + Details
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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
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Balance Type: | na
Period Type: | duration

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

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- Definition Revenue from third customer over 10 percent + References No definition available. + Details
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Namespace Prefix: | leu_
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- Definition Revenue from top 10 customers + References No definition available. + Details
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Namespace Prefix: | leu_
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Balance Type: | na
Period Type: | duration

X
- Definition Revenue from top 4 customers + References No definition available. + Details
Name: | leu_Revenuefromtop4customers
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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