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Net Earnings Per Common Share
 9 Months Ended
Sep. 30, 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
September 30,		Nine Months Ended
September 30,
(In millions, except per share amounts)2024202320242023
Basic Net Earnings Per Common Share:
Numerator:
Net earnings$91.7 $56.6 $272.0 $217.6 
Distributed and allocated undistributed net earnings to unvested restricted stockholders— — — — 
Net earnings available to common stockholders$91.7 $56.6 $272.0 $217.6 
Denominator:
Weighted average number of common shares outstanding - basic145.8 144.5 145.5 144.3 
Basic net earnings per common share:
Basic net earnings per common share$0.63 $0.39 $1.87 $1.51 
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders$91.7 $56.6 $272.0 $217.6 
Denominator:
Weighted average number of common shares outstanding - basic145.8 144.5 145.5 144.3 
Effect of dilutive stock shares and units0.3 0.4 0.3 0.5 
Weighted average number of common shares outstanding - diluted under treasury stock146.1 144.9 145.8 144.8 
Diluted net earnings per common share$0.63 $0.39 $1.87 $1.50