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Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Deferred Finance Costs, Beginning Balance | $ 1.6 us-gaap_DeferredFinanceCostsNoncurrentNet | $ 6.6 us-gaap_DeferredFinanceCostsNoncurrentNet |
Deferred financing costs, additions | 0.7 leu_DeferredFinancingCostsAdditions | 2.2 leu_DeferredFinancingCostsAdditions |
Deferred financing costs, reductions | (1.6)leu_DeferredFinancingCostsAmortization | (7.2)leu_DeferredFinancingCostsAmortization |
Deferred Finance Costs, End Balance | 0.7 us-gaap_DeferredFinanceCostsNoncurrentNet | 1.6 us-gaap_DeferredFinanceCostsNoncurrentNet | 0.7 us-gaap_DeferredFinanceCostsNoncurrentNet
Convertible notes, non-current [Member] |  |  |
Deferred Finance Costs, Beginning Balance | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember | 3.6 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember |
Deferred financing costs, additions | 0 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember | (1.8)leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember |
Deferred financing costs, reductions | 0 leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember | (1.8)leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember |
Deferred Finance Costs, End Balance | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertiblenotesnoncurrentMember |
Bank credit facilities [Member] |  |  |
Deferred Finance Costs, Beginning Balance | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember | 3.0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember |
Deferred financing costs, additions | 0 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember | 2.2 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember |
Deferred financing costs, reductions | 0 leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember | (5.2)leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember |
Deferred Finance Costs, End Balance | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_BankCreditFacilitiesMember |
Convertible notes [Member] |  |  |
Deferred Finance Costs, Beginning Balance | 1.6 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember |  |
Deferred financing costs, additions | 0 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember | 1.8 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember |
Deferred financing costs, reductions | (1.6)leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember | (0.2)leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember |
Deferred Finance Costs, End Balance | 0 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember | 1.6 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_ConvertibleNotesMember |
PIK toggle notes [Member] |  |  |
Deferred Finance Costs, Beginning Balance |  |  | 0.7 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_PIKtogglenotesMember
Deferred financing costs, additions | 0.7 leu_DeferredFinancingCostsAdditions / us-gaap_StatementScenarioAxis = leu_PIKtogglenotesMember |  |
Deferred financing costs, reductions |  |  | 0.1 leu_DeferredFinancingCostsAmortization / us-gaap_StatementScenarioAxis = leu_PIKtogglenotesMember
Deferred Finance Costs, End Balance | $ 0.7 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_PIKtogglenotesMember |  | $ 0.7 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_StatementScenarioAxis = leu_PIKtogglenotesMember

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- Definition Deferred financing costs, additions + References No definition available. + Details
Name: | leu_DeferredFinancingCostsAdditions
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred financing costs, amortization + References No definition available. + Details
Name: | leu_DeferredFinancingCostsAmortization
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
Name: | us-gaap_DeferredFinanceCostsNoncurrentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_StatementScenarioAxis=leu_BankCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=leu_ConvertibleNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=leu_ConvertiblenotesnoncurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=leu_PIKtogglenotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |