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Quarterly Results of Operations (Unaudited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations (Unaudited)
21. QUARTERLY RESULTS OF OPERATIONS (Unaudited)

(in millions, except per share data)
March 31,
2012
June 30,
2012
Sept. 30,
2012
Dec. 31,
2012
Year
2012
March 31,
2011
June 30,
2011
Sept. 30,
2011
Dec. 31,
2011
Year
2011
Revenue
$ 561.5 $ 364.8 $ 570.5 $ 421.3 $ 1,918.1 $ 380.5 $ 454.4 $ 374.5 $ 462.4 $ 1,671.8
Cost of sales
522.7 352.5 533.0 371.9 1,780.1 366.6 421.2 347.6 452.2 1,587.6
Gross profit
38.8 12.3 37.5 49.4 138.0 13.9 33.2 26.9 10.2 84.2
Advanced technology costs
36.8 85.7 45.1 1,146.4 (a) 1,314.0 26.7 33.5 26.0 187.0 (c) 273.2
Selling, general and administrative
14.9 14.8 12.8 13.6 56.1 15.5 16.7 15.6 14.3 62.1
Special charge for workforce reductions and advisory costs
 6.4 3.2 1.5 1.2 12.3
Other (income) (b)
- (10.0 ) (34.6 ) (47.5 ) (92.1 ) (3.7 ) - - - (3.7 )
Operating income (loss)
(19.3 ) (81.4 ) 12.7 (1,064.3 ) (1,152.3 ) (24.6 ) (17.0 ) (14.7 ) (191.1 ) (247.4 )
Interest expense
12.7 12.7 12.3 12.7 50.4 - 0.1 0.2 11.3 11.6
Interest (income)
(0.1 ) (0.1 ) (0.2 ) (1.5 ) (1.9 ) (0.2 ) (0.1 ) (0.1 ) (0.1 ) (0.5 )
Income (loss) before income taxes
(31.9 ) (94.0 ) 0.6 (1,075.5 ) (1,200.8 ) (24.4 ) (17.0. ) (14.8 ) (202.3 ) (258.5 )
Provision (benefit) for income taxes
(3.1 ) (2.0 ) (3.9 ) 8.8 (0.2 ) (7.8 ) 4.2 (7.9 ) 244.1 (d) 232.6
Net income (loss)
$ (28.8 ) $ (92.0 ) $ 4.5 $ (1,084.3 ) $ (1,200.6 ) $ (16.6 ) $ (21.2 ) $ (6.9 ) $ (446.4 ) $ (491.1 )
Net income (loss) per share – basic and diluted
 $ (.24 ) $ (.76 ) $ .04 $ (8.84 ) $ (9.84 ) $ (.14 ) $ (.18 ) $ (.06 ) $ (3.68 ) $ (4.07 )
Weighted average number of shares outstanding:
Basic and diluted
122.3 121.7 122.6 122.6 122.0 119.6 121.1 121.3 121.3 120.8

(a)
Based on our internal analysis concluded as part of our annual assessment, all previously capitalized costs related to the American Centrifuge project were expensed as of December 31, 2012. Capitalization of expenditures related to the American Centrifuge project has ceased until commercial deployment resumes. See Notes 4 and 18 for further details related to the American Centrifuge program.
 
(b)
Pro-rata cost sharing support from DOE for partial funding of American Centrifuge activities. See "American Centrifuge – Project Funding" in Note 18.
 
(c)
Includes expense of $127.1 million of previously capitalized construction work in progress consisting of centrifuge machines determined to no longer be compatible with the commercial plant design for the American Centrifuge Plant. In addition, USEC expensed $9.9 million of previously capitalized prepayments made to an ACP supplier for materials that will not be purchased prior to expiration of the contract.
 
(d)
Includes an increase to the valuation allowance against net deferred taxes of $319.5 million. See Note 14.
 
The amounts previously reported for provision for income taxes, net (loss), and net (loss) per share – basic and diluted for the quarter and year ended December 31, 2011 have been revised. Refer to Note 1 under "Deferred Income Taxes" for a description of the impacts from the revision. The calculation of net income per share and average number of shares outstanding on a dilutive basis for the years ended December 31, 2012, 2011 and 2010 is provided in Note 16. No dilutive effect is recognized in periods in which a net loss has occurred or in which the assumed conversion effect of convertible securities is antidilutive.