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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation 
Schedule of Stock-Based Compensation Costs
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2011
   
2010
   
2011
   
2010
 
Total stock-based compensation costs (millions):
                       
Restricted stock and restricted stock units
  $ 1.6     $ 1.3     $ 6.0     $ 6.2  
Stock options, performance awards and other
    0.3       0.4       1.1       1.5  
Less: costs capitalized as part of inventory
     -       (0.1 )     (0.4 )     (0.3 )
Expense included in selling, general and administrative and advanced technology costs
  $ 1.9     $ 1.6     $ 6.7     $ 7.4  
Total after-tax expense
  $ 1.2     $ 1.1     $ 4.3     $ 4.8  
                                 
Additional information:
                               
Stock options exercised
    -       92,754       -       115,630  
Intrinsic value of stock options exercised (millions)
    -     $ 0.1       -     $ 0.2  
Cash received from exercise of stock options (millions)
    -     $ 0.4       -     $ 0.5  
Schedule of Assumptions in the Option Pricing Model
 
Three Months Ended September 30, 
Nine Months Ended September 30, 
 
2011
2010
2011
2010
Risk-free interest rate
-
0.78%
-
0.78
1.43%
Expected dividend yield
-
-
-
 
-
 
Expected volatility
-
75%
-
72
75%
Expected option life (years)
-
4.1
-
4
4.1
Weighted-average grant date fair value
-
$3.09
-
$2.81
Options granted
0
6,968
0
773,018