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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2011
Stock-Based Compensation  
Schedule of Stock-Based Compensation Costs
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2011
   
2010
   
2011
   
2010
 
   
(millions)
 
Total stock-based compensation costs:
                       
Restricted stock and restricted stock units
  $ 2.1     $ 2.0     $ 4.4     $ 4.9  
Stock options, performance awards and other
    0.3       0.4       0.8       1.1  
Less: costs capitalized as part of inventory
    (0.1 )     (0.1 )     (0.4 )     (0.2 )
Expense included in selling, general and administrative and advanced technology costs
  $ 2.3     $ 2.3     $ 4.8     $ 5.8  
Total after-tax expense
  $ 1.5     $ 1.4     $ 3.1     $ 3.7  
Schedule of Assumptions in the Option Pricing Model
 
Three Months Ended June 30, 
Six Months Ended June 30, 
 
2011
2010
2011
2010
Risk-free interest rate
-
-
-
1.4%
Expected dividend yield
-
-
-
-
Expected volatility
-
-
-
72%
Expected option life
-
-
-
4 years
Weighted-average grant date fair value
-
-
-
$2.81
Options granted
0
0
0
766,050