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Net Earnings Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Earnings Per Share

(6) Net Earnings Per Share

The calculation of net earnings per share - basic and net earnings per share - diluted were as follows:

 

Year Ended December 31

 

2019

 

 

2018

 

 

2017

 

Net earnings available to common shareholders:

 

$

465.7

 

 

$

556.7

 

 

$

545.4

 

Weighted-average common shares outstanding (in millions):

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-average common shares outstanding - basic

 

 

59.9

 

 

 

64.6

 

 

 

67.1

 

Effect of dilutive securities - stock options

 

 

—

 

 

 

0.1

 

 

 

0.2

 

Effect of other share-based awards

 

 

0.4

 

 

 

0.4

 

 

 

0.6

 

Weighted-average common shares outstanding - diluted

 

 

60.3

 

 

 

65.1

 

 

 

67.9

 

Net earnings per share - basic

 

$

7.78

 

 

$

8.62

 

 

$

8.13

 

Net earnings per share - diluted

 

$

7.72

 

 

$

8.56

 

 

$

8.04

 

 

There were certain share-based awards excluded from the calculation of net earnings per share - diluted for the year ended December 31, 2019 and 2018, because their impact was anti-dilutive. No share-based awards were excluded from the calculation for the year ended December 31, 2017. The number, exercise prices and weighted-average remaining life of these antidilutive awards were as follows:

 

 

 

2019

 

 

2018

 

 

2017

 

Shares (in thousands)

 

 

401

 

 

 

264

 

 

 

—

 

Exercise price

 

$

99

 

 

$

109

 

 

$

—

 

Weighted-average remaining life

 

0.9 years

 

 

1.2 years

 

 

 

—