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Net Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Net Earnings Per Share [Abstract]  
Net Earnings Per Share
The calculation of net earnings per share – basic and net earnings per share – diluted were as follows:

3 Months Ended
March 31,
2013
2012
Net earnings per share – basic:
Net earnings available to common shareholders
$
23.9
$
40.2
Weighted-average common shares outstanding
77.1
80.2
$
0.31
$
0.50
Net earnings per share – diluted:
Net earnings available to common shareholders
$
23.9
$
40.2
Weighted-average common shares outstanding
77.1
80.2
Effect of dilutive securities – stock options
0.6
0.4
Effect of other share-based awards
0.5
0.3
78.2
80.9
$
0.31
$
0.50
 
There were 3.4 million and 4.1 million share-based awards excluded from the calculation of net earnings per share – diluted for the three months ended March 31, 2013 and 2012, respectively, as the exercise price for these awards was greater than the average market price of the common shares during the period.