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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Separative work units	$ 347.2	$ 330.3	$ 885.1	$ 638.8
Uranium	3.6	67.8	3.6	81.8
Revenue from low enriched uranium segment	350.8	398.1	888.7	720.6
Contract services revenue	14.0	56.3	37.6	114.3
Total revenue	364.8	454.4	926.3	834.9
LEU segment gross profit	10.4	29.5	47.1	44.8
Contract services segment gross profit	1.9	3.7	4.0	2.3
Gross profit	12.3	33.2	51.1	47.1
Advanced technology costs	85.7	33.5	122.5	60.2
Selling, general and administrative	14.8	16.7	29.7	32.2
Special charge for workforce reductions and advisory costs	3.2		9.6
Other (income)	(10.0)		(10.0)	(3.7)
Operating (loss)	(81.4)	(17.0)	(100.7)	(41.6)
Interest expense (income), net	12.6		25.2	(0.2)
(Loss) before income taxes all segments	$ (94.0)	$ (17.0)	$ (125.9)	$ (41.4)

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