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v2.4.1.9

Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
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Successor [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Utility Customer Receivables | $ 36.3 leu_UtilityCustomerReceivables / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
DOE pro-rata share of Cooperative Agreement funding | 0 leu_RdDProgramQualifyingExpendituresToDateDoeShareReceivable / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Contract Services Customer Receivables | 22.6 leu_ContractServicesCustomerReceivables / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Accounts Receivable, Net | 58.9 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 90.0 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Predecessor [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Utility Customer Receivables |  |  | 129.3 leu_UtilityCustomerReceivables / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
DOE pro-rata share of Cooperative Agreement funding |  |  | 20.1 leu_RdDProgramQualifyingExpendituresToDateDoeShareReceivable / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Contract Services Customer Receivables |  |  | 13.6 leu_ContractServicesCustomerReceivables / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Accounts Receivable, Net |  |  | $ 163.0 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition Contract Services Customer Receivables + References No definition available. + Details
Name: | leu_ContractServicesCustomerReceivables
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable + References No definition available. + Details
Name: | leu_RdDProgramQualifyingExpendituresToDateDoeShareReceivable
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Utility Customer Receivables + References No definition available. + Details
Name: | leu_UtilityCustomerReceivables
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
Name: | us-gaap_AccountsReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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