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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2012
Stock-Based Compensation  
Schedule of Stock-Based Compensation Costs
   
Three Months Ended March 31,
   
2012
   
2011
   
(millions)
Total stock-based compensation costs:
       
Restricted stock and restricted stock units     
  $ 1.2     $ 2.3  
Stock options, performance awards and other         
    0.3       0.5  
Less: costs capitalized as part of inventory        
     -       (0.3 )
Expense included in selling, general and administrative and advanced technology costs
  $ 1.5     $ 2.5  
Total recognized tax benefit
  $ -     $ 0.9