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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Separative work units	$ 537.9	$ 308.5
Uranium		14.0
Revenue from low enriched uranium segment	537.9	322.5
Contract services revenue	23.6	58.0
Total revenue	561.5	380.5
LEU segment gross profit	36.7	15.3
Contract services segment gross profit	2.1	(1.4)
Gross profit	38.8	13.9
Advanced technology costs	36.8	26.7
Selling, general and administrative	14.9	15.5
Special charge for workforce reductions and advisory costs	6.4
Other (income)		(3.7)
Operating income (loss)	(19.3)	(24.6)
Interest expense (income), net	12.6	(0.2)
Income (loss) before income taxes all segments	$ (31.9)	$ (24.4)

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