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Property, Plant and Equipment (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Property, Plant and Equipment    
Capital expenditures for American Centrifuge Project $ 1,100.0 $ 1,100.0
Capitalized asset retirement obligations 19.3 19.3
Transfer of machinery and equipment to U.S. Department of Energy 44.6  
Transfer from CWIP to depreciating assets 303.1  
Transfer from prepaid assets to depreciating assets 12.3  
Previously capitalized CWIP expensed $ 2.8