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Property, Plant and Equipment (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Property, Plant and Equipment    
Expense of American Centrifuge capital assets   $ 1,100,000,000
Expense of American Centrifuge property, plant and eqipment   1,075,600,000
Expense of American Centrifuge prepaid assets   9,900,000
Expense of American Centrifuge deferred financing costs   6,700,000
Transfers and retirements of property, plant and equipment 44,600,000 47,400,000
Accelerated propery, plant and equipment expenses   5,600,000
Previously capitalized CWIP expensed   3,500,000
Accelerated depreciation expense   $ 2,100,000