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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Information
Separative work units	$ 297.9	$ 404.2	$ 936.7	$ 1,001.8
Uranium	21.3	79.3	103.1	164.5
Revenue LEU Segment	319.2	483.5	1,039.8	1,166.3
Contract services revenue	55.3	81.1	169.6	202.7
Total revenue	374.5	564.6	1,209.4	1,369.0
LEU segment gross profit	20.7	32.1	65.5	89.1
Contract services segment gross profit	6.2	5.9	8.5	19.7
Gross profit	26.9	38.0	74.0	108.8
Advanced technology costs	26.0	28.6	86.2	80.3
Selling, general and administrative	15.6	14.0	47.8	43.4
Other (income)		(12.4)	(3.7)	(32.4)
Operating income (loss)	(14.7)	7.8	(56.3)	17.5
Interest expense (income), net	0.1	4.9	(0.1)	4.8
Income (loss) before income taxes	(14.8)	2.9	(56.2)	12.7
Upper limit of intersegment sales between the reportable segments	$ 0.1	$ 0.1	$ 0.1	$ 0.1

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