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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue:
Separative work units										$ 1,330.9	$ 1,521.4	$ 1,647.0
Uranium										131.8	236.1	180.7
Revenue from low enriched uranium segment										1,462.7	1,757.5	1,827.7
Contract services revenue										209.1	277.9	209.1
Total revenue		462.4	374.5	454.4	380.5	666.4	564.6	459.7	344.7	1,671.8	2,035.4	2,036.8
LEU segment gross profit										71.6	134.3	187.4
Contract services segment gross profit										12.6	24.1	17.3
Gross profit										84.2	158.4	204.7
Special charges	0.6											4.1
Advanced technology costs		187.0	26.0	33.5	26.7	29.9	28.6	26.0	25.7	273.2	110.2	118.4
Selling, general and administrative		14.3	15.6	16.7	15.5	15.5	14.0	14.3	15.1	62.1	58.9	58.8
Other (income)					(3.7)	(12.0)	(12.4)	(10.3)	(9.7)	(3.7)	(44.4)	(70.7)
Operating income (loss)										(247.4)	33.7	94.1
Interest expense (income) and issuance costs, net										11.1	6.8	(0.1)
Income (loss) before income taxes all segments										$ (258.5)	$ 26.9	$ 94.2

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