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Net Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted 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)202420232022
Basic Net Earnings Per Common Share:   
Numerator:   
Net earnings$264.7 $341.6 $491.6 
Distributed and allocated undistributed net earnings to unvested restricted stockholders
— — — 
Net earnings available to common stockholders$264.7 $341.6 $491.6 
Denominator:   
Weighted average number of common shares outstanding - basic145.5 144.4 145.9 
Basic net earnings per common share:   
  Basic net earnings per common share$1.82 $2.37 $3.37 
Diluted Net Earnings Per Common Share:   
Numerator:   
Net earnings available to common stockholders$264.7 $341.6 $491.6 
Denominator:   
Weighted average number of common shares outstanding - basic145.5 144.4 145.9 
Effect of dilutive stock shares and units0.5 0.5 1.5 
Weighted average number of common shares outstanding - diluted under treasury stock
146.0 144.9 147.4 
Diluted net earnings per common share$1.81 $2.36 $3.33