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Net Earnings Per Share
6 Months Ended
Jun. 30, 2011
Net Earnings Per Share [Abstract]  
Net Earnings Per Share
(7) Net Earnings Per Share
 
The calculation of Net Earnings Per Share – Basic and Net Earnings Per Share – Diluted was as follows:
 
   
3 Months Ended
  
6 Months Ended
 
   
June 30,
  
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Net Earnings Per Share – Basic:
            
Net earnings available to common shareholders
 $72.7  $32.7  $108.4  $35.5 
Weighted-average common shares outstanding
  82.0   81.5   82.0   80.1 
   $0.89  $0.40  $1.32  $0.44 
Net Earnings Per Share – Diluted:
                
Net earnings available to common shareholders
 $72.7  $32.7  $108.4  $35.5 
Weighted-average common shares outstanding
  82.0   81.5   82.0   80.1 
Effect of dilutive securities – stock options
  1.0   0.8   1.1   0.9 
Effect of other stock-based awards
  0.3   0.2   0.6   0.2 
    83.3   82.5   83.7   81.2 
   $0.87  $0.40  $1.30  $0.44 

There were 1.7 million and 3.2 million stock-based awards excluded from the calculation of Net Earnings Per Share – Diluted for the three months ended June 30, 2011 and 2010, respectively, and 1.7 million and 2.6 million stock-based awards excluded from the calculation of Net Earnings Per Share – Diluted for the six months ended June 30, 2011 and 2010, respectively, as the exercise price for these awards was greater than the average market price of the common shares during the period.