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Net Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Earnings Per Common Share
The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the years ended December 31:
 Year Ended December 31,
(In millions, except per share amounts)202020192018
Basic Net Earnings Per Common Share:   
Numerator   
Net earnings$502.9 $263.0 $193.1 
Distributed and allocated undistributed net earnings to unvested restricted stockholders
(0.2)(0.5)(0.9)
Distributed and allocated undistributed net earnings
502.7 262.5 192.2 
Distributed net earnings - dividends paid to common stockholders(99.4)(98.7)(101.7)
Allocation of undistributed net earnings to common stockholders$403.3 $163.8 $90.5 
Denominator   
Weighted average number of common shares outstanding - basic155.2 154.3 159.4 
Basic net earnings per common share:   
Distributed net earnings$0.64 $0.64 $0.64 
Allocated undistributed net earnings to common stockholders2.60 1.06 0.57 
  Basic net earnings per common share$3.24 $1.70 $1.21 
Diluted Net Earnings Per Common Share:   
Numerator   
Distributed and allocated undistributed net earnings to common stockholders
$502.7 $262.5 $192.2 
Add: Allocated undistributed net earnings to unvested restricted stockholders
0.1 0.4 0.5 
Less: Undistributed net earnings reallocated to unvested restricted stockholders
(0.1)(0.4)(0.5)
Net earnings available to common stockholders - diluted$502.7 $262.5 $192.2 
Denominator   
Weighted average number of common shares outstanding - basic155.2 154.3 159.4 
Effect of unvested restricted stock - nonparticipating security0.1 — — 
Effect of contingently issuable shares0.2 0.2 0.1 
Effect of unvested restricted stock units0.5 0.3 0.3 
Weighted average number of common shares outstanding - diluted under two-class
156.0 154.8 159.8 
Effect of unvested restricted stock - participating security— 0.4 0.4 
Weighted average number of common shares outstanding - diluted under treasury stock
156.0 155.2 160.2 
Diluted net earnings per common share$3.22 $1.69 $1.20