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Net Earnings Per Share
 12 Months Ended
Dec. 31, 2023
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

 

2023

 

 

2022

 

 

2021

 

Net earnings available to common shareholders:

 

$

88.8

 

 

$

373.8

 

 

$

382.4

 

Weighted-average common shares outstanding (in millions):

 

 

 

 

 

 

 

 

 

Weighted-average common shares outstanding - basic

 

 

49.8

 

 

 

52.2

 

 

 

54.5

 

Effect of dilutive securities - stock options

 

 

—

 

 

 

—

 

 

 

0.2

 

Effect of other share-based awards

 

 

0.6

 

 

 

0.6

 

 

 

0.7

 

Weighted-average common shares outstanding - diluted

 

 

50.4

 

 

 

52.8

 

 

 

55.4

 

Net earnings per share - basic

 

$

1.78

 

 

$

7.17

 

 

$

7.01

 

Net earnings per share - diluted

 

$

1.76

 

 

$

7.08

 

 

$

6.91

 

 

There were 0.6 million, 0.5 million and 0.1 million share-based awards excluded from the calculation of net earnings per share - diluted for the years ended December 31, 2023, 2022 and 2021, respectively, because their impact was anti-dilutive.