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Property, Plant and Equipment (Narrative) (Details) (USD $) In Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010
Property, Plant and Equipment |  |
Capital expenditures for American Centrifuge Project | $ 1,213.9 | $ 1,143.8
Capitalized asset retirement obligations | 19.3 | 19.3
Expensed centrifuge machines | 9.6 |
Upper range of potential future expense for centrifuge machine disposal | $ 100.0 |

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