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Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2014
Predecessor [Member]
Inventory [Line Items]
Separative work units inventory	$ 628.4leu_SeparativeWorkUnitsInventory / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Uranium inventory	335.4leu_UraniumInventory / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Materials and supplies	3.8us-gaap_OtherInventorySupplies / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Inventories	967.6us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Separative work units owed to customers and suppliers	200.0leu_SeparativeWorkUnitsOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Uranium owed to customers and suppliers	299.7leu_UraniumOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Inventories owed to customers and suppliers	499.7leu_InventoriesOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Separative work units net of liability	428.4leu_SeparativeWorkUnitsNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Uranium inventory net of liability	35.7leu_UraniumInventoryNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Inventories, net	467.9leu_InventoryNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Successor [Member]
Inventory [Line Items]
Separative work units inventory		330.6leu_SeparativeWorkUnitsInventory / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Uranium inventory		131.4leu_UraniumInventory / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Materials and supplies		0.2us-gaap_OtherInventorySupplies / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inventories		462.2us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	499.4us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Separative work units owed to customers and suppliers		76.6leu_SeparativeWorkUnitsOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Uranium owed to customers and suppliers		82.3leu_UraniumOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inventories owed to customers and suppliers		158.9leu_InventoriesOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember	173.1leu_InventoriesOwedToCustomersAndSuppliers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Separative work units net of liability		254.0leu_SeparativeWorkUnitsNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Uranium inventory net of liability		49.1leu_UraniumInventoryNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inventories, net		$ 303.3leu_InventoryNetOfLiability / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

X

- Definition

Cost of SWU and uranium inventories owed related to the transfer of title from USEC to customer at fabricator whereby fabricator has elected to order less material from USEC than is required. Amounts owed are satisfied when fabricator orders future bulk deliveries.

+ References

No definition available.

+ Details

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

X

- Definition

Inventory net of Liability

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of separative work unit ("SWU") inventory. SWU is held as the SWU component of low enriched uranium. A SWU is the standard measure of uranium enrichment using a standard formula derived from the physics of enrichment. SWU costs are based on production costs and purchase costs. SWU inventory is valued at the lower of cost or market.

+ References

No definition available.

+ Details

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

X

- Definition

Separative work units inventory net of liability

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Separative work units owed to customers and suppliers

+ References

No definition available.

+ Details

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Namespace Prefix:	leu_
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X

- Definition

Carrying amount as of the balance sheet date of uranium inventory. Uranium is held in the form of natural uranium and as the uranium component of low enriched uranium. Uranium inventory is valued at the lower of cost or market.

+ References

No definition available.

+ Details

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

X

- Definition

Uranium inventory net of liability

+ References

No definition available.

+ Details

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Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Uranium owed to customers and suppliers

+ References

No definition available.

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Namespace Prefix:	leu_
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X

- Details

Name:	us-gaap_InventoryLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ 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 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

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

- Definition

Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Inventory

-URI http://asc.fasb.org/extlink&oid=6516093



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(5))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

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- Details

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