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Net Earnings Per Share
 12 Months Ended
Dec. 31, 2022
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

 

2022

 

 

2021

 

 

2020

 

Net earnings available to common shareholders:

 

$

373.8

 

 

$

382.4

 

 

$

23.8

 

Weighted-average common shares outstanding (in millions):

 

 

 

 

 

 

 

 

 

Weighted-average common shares outstanding - basic

 

 

52.2

 

 

 

54.5

 

 

 

58.0

 

Effect of dilutive securities - stock options

 

 

—

 

 

 

0.2

 

 

 

—

 

Effect of other share-based awards

 

 

0.6

 

 

 

0.7

 

 

 

0.3

 

Weighted-average common shares outstanding - diluted

 

 

52.8

 

 

 

55.4

 

 

 

58.3

 

Net earnings per share - basic

 

$

7.17

 

 

$

7.01

 

 

$

0.41

 

Net earnings per share - diluted

 

$

7.08

 

 

$

6.91

 

 

$

0.41

 

 

There were 0.5 million, 0.1 million and 0.6 million share-based awards excluded from the calculation of net earnings per share - diluted for the years ended December 31, 2022, 2021 and 2020, respectively, because their impact was anti-dilutive.