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Net Earnings per Common Share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Net Earnings per Common Share Net Earnings per Common Share
The following table shows the calculation of basic and diluted net earnings per common share: 
 Year Ended December 31,
(In millions, except per share amounts)202320222021
Basic Net Earnings Per Common Share:   
Numerator:   
Net earnings$341.6 $491.6 $506.8 
Distributed and allocated undistributed net earnings to unvested restricted stockholders
— — — 
Net earnings available to common stockholders$341.6 $491.6 $506.8 
Denominator:   
Weighted average number of common shares outstanding - basic144.4 145.9 150.9 
Basic net earnings per common share:   
  Basic net earnings per common share$2.37 $3.37 $3.36 
Diluted Net Earnings Per Common Share:   
Numerator:   
Net earnings available to common stockholders$341.6 $491.6 $506.8 
Denominator:   
Weighted average number of common shares outstanding - basic144.4 145.9 150.9 
Effect of dilutive stock shares and units0.5 1.5 1.5 
Weighted average number of common shares outstanding - diluted under treasury stock
144.9 147.4 152.4 
Diluted net earnings per common share$2.36 $3.33 $3.32 
PSU Awards
We included contingently issuable shares using the treasury stock method for our PSU awards in the diluted weighted average number of common shares outstanding based on the number of contingently issuable shares that would be issued assuming the end of our reporting period was the end of the relevant PSU award contingency period. The calculation of diluted weighted average shares outstanding related to PSUs was 0.2 million in 2023, 0.8 million in 2022, and 0.6 million in 2021.
SLO Awards
The SLO program was terminated following the 2022 performance year and there are no contingently issuable shares under such program as of December 31, 2023. The dilutive impact associated with SLO awards for 2023, 2022 and 2021 was nominal.