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Net Earnings Per Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Net Earnings Per Share
Net Earnings Per Share

The calculations of net earnings per share – basic and net earnings per share – diluted were as follows:
 
 
3 Months Ended
 
9 Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
Net earnings available to common shareholders
 
$
158.0

 
$
137.7

 
$
398.4

 
$
329.1

 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding (in millions)
 
 
 
 
 
 
 
 
   Weighted-average common shares outstanding - basic
 
64.5

 
66.8

 
65.6

 
67.3

        Effect of dilutive securities - stock options
 
0.1

 
0.2

 
0.1

 
0.2

        Effect of other share-based awards
 
0.4

 
0.6

 
0.4

 
0.6

   Weighted-average common shares outstanding - diluted
 
65.0

 
67.6

 
66.1

 
68.1

 
 
 
 
 
 
 
 
 
 Net earnings per share - basic
 
$
2.45

 
$
2.06

 
$
6.08

 
$
4.89

 Net earnings per share - diluted
 
$
2.43

 
$
2.04

 
$
6.03

 
$
4.84



There were 0.3 million and 0.1 million share-based awards excluded from the calculation of net earnings per share – diluted for the three months ended September 30, 2018 and 2017, respectively, and the calculation of net earnings per share – diluted for the nine months ended September 30, 2018 and 2017, respectively, because their impact was anti-dilutive.