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Net Earnings (Loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Net Earnings / (Loss) Per Share
The calculation of Net earnings (loss) per share — basic was as follows:
 
Year Ended December 31  2011   2010   2009  
Net earnings (loss) available to common shareholders $ 251.6  $ (263.6) $ (9.2)
Weighted-average common shares outstanding (in millions) 81.6   81.0   78.3  
Total $ 3.08  $ (3.26) $ (0.12)
 
The calculation of Net earnings (loss) per share — diluted was as follows:
 
Year Ended December 31  2011   2010   2009  
Net earnings (loss) available to common shareholders $ 251.6  $ (263.6) $ (9.2)
Weighted-average common shares outstanding (in millions) 81.6   81.0   78.3  
Effect of dilutive securities — stock options (in millions)  0.7      
Effect of other share-based awards (in millions)  0.5      
   82.8   81.0   78.3  
Total $ 3.04  $ (3.26) $ (0.12)
 
Detail of anti-dilutive stock based awards
Due to the net loss for the years ended December 31, 2010 and 2009, the assumed exercise of share-based awards had an antidilutive effect and therefore was not included in the calculation of Net loss per share—diluted. The number, exercise prices and weighted-average remaining life of these antidilutive awards were as follows:
 
   2011   2010   2009  
Shares (in thousands)  3,074   6,583   6,231  
Exercise price ranges $52–$93  $11–$93  $9–$93  
Weighted-average remaining life  6.3 years   5.8 years   6.2 years