XML 52 R36.htm IDEA: XBRL DOCUMENT v2.4.0.6
Deferred Revenue and Advances from Customers (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Advances from customers $ 39.5 $ 39.5   $ 23.7
DOE RD&D Program funding through July 2012   26.4    
Qualifying expenditures for RD&D Program   12.5    
Other (income) 10.0 10.0 3.7  
DOE contract services [Member]
        
Advances from customers 21.2 21.2   22.3
DOE advanced technology [Member]
        
Advances from customers $ 16.4 $ 16.4