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Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document and Entity Information
Entity Registrant Name	USEC INC
Entity Central Index Key	0001065059
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		4,948,235
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3

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