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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

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