XML 44 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
Property, Plant and Equipment (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant and Equipment          
Capital expenditures for American Centrifuge Project $ 1,119.0   $ 1,119.0 $ 1,143.8  
Interest costs capitalized during period     33.4 31.6 22.9
Capitalized asset retirement obligations 19.3   19.3    
Expensed centrifuge machines 127.1 9.6      
ACP spending reduction in October 2011     30.00%    
Upper range of potential ACP asset impairment expense     $ 1,100.0