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Deferred Revenue and Advances from Customers (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Advances from customers $ 65.4 $ 65.4   $ 23.7
Other (income) 34.6 44.6 3.7  
DOE contract services [Member]
        
Advances from customers 20.6 20.6   22.3
DOE advanced technology [Member]
        
Advances from customers 43.1 43.1    
DOE initial RD&D Program funding   87.7    
Cash collateral deposits received   55.6    
Cash collateral deposits expected to be received   32.1    
Qualifying expenditures for RD&D Program   55.7    
Other (income)   $ 44.6