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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Information
Separative work units	$ 330.3	$ 331.0	$ 638.8	$ 597.6
Uranium	67.8	69.6	81.8	85.2
Revenue LEU Segment	398.1	400.6	720.6	682.8
Contract services revenue	56.3	59.1	114.3	121.6
Total revenue	454.4	459.7	834.9	804.4
LEU segment gross profit	29.5	42.0	44.8	57.0
Contract services segment gross profit	3.7	2.1	2.3	13.8
Gross profit	33.2	44.1	47.1	70.8
Advanced technology costs	33.5	26.0	60.2	51.7
Selling, general and administrative	16.7	14.3	32.2	29.4
Other (income)		(10.3)	(3.7)	(20.0)
Operating income (loss)	(17.0)	14.1	(41.6)	9.7
Interest expense (income), net			(0.2)	(0.1)
Income (loss) before income taxes	(17.0)	14.1	(41.4)	9.8
Upper limit of intersegment sales between the reportable segments	$ 0.1	$ 0.1	$ 0.1	$ 0.1

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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

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