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Net Earnings Per Common Share
 3 Months Ended
Mar. 31, 2024
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:
Three Months Ended
March 31,
(In millions, except per share amounts)20242023
Basic Net Earnings Per Common Share:
Numerator:
Net earnings$82.0 $61.9 
Distributed and allocated undistributed net earnings to unvested restricted stockholders— — 
Net earnings available to common stockholders$82.0 $61.9 
Denominator:
Weighted average number of common shares outstanding - basic144.9 144.1 
Basic net earnings per common share:
Basic net earnings per common share$0.57 $0.43 
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders$82.0 $61.9 
Denominator:
Weighted average number of common shares outstanding - basic144.9 144.1 
Effect of dilutive stock shares and units0.5 0.7 
Weighted average number of common shares outstanding - diluted under treasury stock145.4 144.8 
Diluted net earnings per common share$0.56 $0.43