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

X

- Definition

Contract Services Customer Receivables

+ References

No definition available.

+ Details

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Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- Details

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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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: