Convertible Preferred Stock and Common Stock Warrants (Notes)	12 Months Ended
Dec. 31, 2013
Convertible Preferred Stock and Common Stock Warrants [Abstract]
Preferred Stock [Text Block]	CONVERTIBLE PREFERRED STOCK AND COMMON STOCK WARRANTS In May 2010, Toshiba and B&W signed a securities purchase agreement to make a $200 million investment in USEC. Under the terms of the agreement, Toshiba and B&W each agreed to invest $100 million in USEC over three phases, each of which is subject to specific closing conditions. Closing for the first phase occurred in September 2010 and USEC received $75 million. Subsequent closings for the second and third phases are subject to certain conditions, including securing a $2 billion loan guarantee from DOE. Under our proposed Plan, the investments of Toshiba and B&W will be restructured. Refer to "Chapter 11 Filing" in Note 1. At the September 2010 closing, Toshiba and B&W purchased 75,000 shares of Series B-1 12.75% convertible preferred stock, and warrants to purchase 250,000 shares of common stock (adjusted for 1-for-25 reverse stock split) at an exercise price of $187.50 per share, which will be exercisable in the future. As of December 31, 2013, the convertible preferred stock balance of $113.9 million includes additional shares of convertible preferred stock totaling $38.9 million representing dividends paid-in-kind either issued or payable. The convertible preferred stock balance of $113.9 million equates to 17.1 million shares of common stock based on the arithmetic average of the daily volume-weighted average share price for USEC common stock as of December 31, 2013 for the preceding 20 trading days, or $6.66 per share. The effect of dilutive securities on net income per share is provided in Note 18. Prior to obtaining shareholder approval, the preferred stock may not be converted into an aggregate number of shares of common stock in excess of 19.99% of the shares of USEC’s common stock outstanding on May 25, 2010 (approximately 0.9 million shares adjusted for 1-for-25 reverse stock split), in compliance with the rules of the New York Stock Exchange. If a share issuance limitation were to exist at the time of share conversion, any preferred stock shares subject to the share issuance limitation would be subject to optional or mandatory redemption for, at USEC's option, cash or SWU consideration. However, USEC’s ability to redeem may be limited by Delaware law.

CONVERTIBLE PREFERRED STOCK AND COMMON STOCK WARRANTS

In May 2010, Toshiba and B&W signed a securities purchase agreement to make a $200 million investment in USEC. Under the terms of the agreement, Toshiba and B&W each agreed to invest $100 million in USEC over three phases, each of which is subject to specific closing conditions. Closing for the first phase occurred in September 2010 and USEC received $75 million. Subsequent closings for the second and third phases are subject to certain conditions, including securing a $2 billion loan guarantee from DOE. Under our proposed Plan, the investments of Toshiba and B&W will be restructured. Refer to "Chapter 11 Filing" in Note 1.

At the September 2010 closing, Toshiba and B&W purchased 75,000 shares of Series B-1 12.75% convertible preferred stock, and warrants to purchase 250,000 shares of common stock (adjusted for 1-for-25 reverse stock split) at an exercise price of $187.50 per share, which will be exercisable in the future. As of December 31, 2013, the convertible preferred stock balance of $113.9 million includes additional shares of convertible preferred stock totaling $38.9 million representing dividends paid-in-kind either issued or payable. The convertible preferred stock balance of $113.9 million equates to 17.1 million shares of common stock based on the arithmetic average of the daily volume-weighted average share price for USEC common stock as of December 31, 2013 for the preceding 20 trading days, or $6.66 per share. The effect of dilutive securities on net income per share is provided in Note 18.

Prior to obtaining shareholder approval, the preferred stock may not be converted into an aggregate number of shares of common stock in excess of 19.99% of the shares of USEC’s common stock outstanding on May 25, 2010 (approximately 0.9 million shares adjusted for 1-for-25 reverse stock split), in compliance with the rules of the New York Stock Exchange. If a share issuance limitation were to exist at the time of share conversion, any preferred stock shares subject to the share issuance limitation would be subject to optional or mandatory redemption for, at USEC's option, cash or SWU consideration. However, USEC’s ability to redeem may be limited by Delaware law.