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Property, Plant and Equipment Property, Plant and Equipment (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Abstract]          
Asset Retirement Charges $ 19,800,000   $ 19,800,000    
Expense of American Centrifuge capital assets       1,100,000,000  
Expense of American Centrifuge property, plant and equipment       1,075,600,000  
Expense of prepaid assets       9,900,000  
Expense of deferred financing costs       6,700,000  
Transfers and retirements of machinery   $ 44,600,000 $ 19,800,000 $ 47,400,000 $ 0