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Net Earnings Per Common Share
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Net Earnings Per Common Share Net Earnings Per Common ShareThe following table shows the calculation of basic and diluted net earnings per common share:
Three Months Ended
June 30,		Six Months Ended
June 30,
(In millions, except per share amounts)2022202120222021
Basic Net Earnings Per Common Share:
Numerator:
Net earnings$113.9 $108.1 $263.1 $218.2 
Distributed and allocated undistributed net earnings to unvested restricted stockholders— — — — 
Net earnings available to common stockholders$113.9 $108.1 $263.1 $218.2 
Denominator:
Weighted average number of common shares outstanding - basic146.0 151.4 146.8 152.8 
Basic net earnings per common share:
Basic net earnings per common share$0.78 $0.71 $1.79 $1.43 
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders$113.9 $108.1 $263.1 $218.2 
Denominator:
Weighted average number of common shares outstanding - basic146.0 151.4 146.8 152.8 
Effect of dilutive stock shares and units1.5 1.3 1.7 1.2 
Weighted average number of common shares outstanding - diluted under treasury stock147.5 152.7 148.5 154.0 
Diluted net earnings per common share$0.77 $0.71 $1.77 $1.42