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Segment Information (Segment Reporting Information) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Geographic Areas, Revenues from External Customers [Abstract]                      
Revenue United States                 $ 1,024.4 $ 1,538.0 $ 1,259.3
Revenue Japan                 105.6 182.1 199.7
Revenue Other Countries                 177.5 142.0 141.8
Revenue Foreign                 283.1 324.1 341.5
Total Revenue 398.5 303.8 284.8 320.4 403.3 563.0 353.8 542.0 1,307.5 1,862.1 1,600.8
Revenues [Abstract]                      
Separative work units                 1,222.9 1,821.8 1,330.9
Uranium                 71.2 26.0 131.8
Revenue from low enriched uranium segment                 1,294.1 1,847.8 1,462.7
Contract services                 13.4 14.3 138.1
Total Revenue 398.5 303.8 284.8 320.4 403.3 563.0 353.8 542.0 1,307.5 1,862.1 1,600.8
LEU segment gross profit                 (94.7) 129.3 71.6
Contract services segment gross profit                 (0.2) 0.1 3.8
Gross profit                 (94.9) 129.4 75.4
LEU Segment Assets 1,646.0       2,208.5       1,646.0 2,208.5 3,491.4
NAC assets 0       15.6       0 15.6 20.1
Other contract services segment assets 59.5       42.3       59.5 42.3 37.8
Contract Services Segment Assets 59.5       57.9       59.5 57.9 57.9
Total Assets $ 1,705.5       $ 2,266.4       $ 1,705.5 $ 2,266.4 $ 3,549.3