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Inventories (Narrative) (Details) - USD ($) $ in Billions	Jun. 30, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Inventories provided by customers and suppliers	$ 0.5	$ 0.6

X

- Definition

Uranium held by USEC to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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