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Inventories (Narrative) (Details) (USD $) In Billions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Inventory, Net [Abstract] |  |
Inventories provided by customers and suppliers | $ 0.6 leu_InventoriesProvidedByCustomersAndSuppliers | $ 1.3 leu_InventoriesProvidedByCustomersAndSuppliers
Decline in Uranium Quantities Provided by Customers and Suppliers | 52.00%leu_DeclineInUraniumQuantitiesProvidedByCustomersAndSuppliers |

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- Definition Decline in Uranium Quantities Provided by Customers and Suppliers + References No definition available. + Details
Name: | leu_DeclineInUraniumQuantitiesProvidedByCustomersAndSuppliers
Namespace Prefix: | leu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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