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Net Earnings Per Common Share
 6 Months Ended
Jun. 30, 2020
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 under the two-class method: 
Three Months Ended
June 30,		Six Months Ended
June 30,
(In millions, except per share amounts)2020201920202019
Basic Net Earnings Per Common Share:
Numerator:
Net earnings$100.1  $33.2  $226.7  $90.7  
Distributed and allocated undistributed net earnings to unvested restricted stockholders
—  (0.1) (0.1) (0.2) 
Distributed and allocated undistributed net earnings
100.1  33.1  226.6  90.5  
Distributed net earnings - dividends paid to common stockholders
(24.9) (24.6) (49.7) (49.4) 
Allocation of undistributed net earnings to common stockholders
$75.2  $8.5  $176.9  $41.1  
Denominator:
Weighted average number of common shares outstanding - basic155.6  154.5  155.1  154.6  
Basic net earnings per common share:
Distributed net earnings$0.16  $0.16  $0.32  $0.32  
Allocated undistributed net earnings to common stockholders
0.48  0.06  1.14  0.27  
Basic net earnings per common share$0.64  $0.22  $1.46  $0.59  
Diluted Net Earnings Per Common Share:
Numerator:
Distributed and allocated undistributed net earnings
$100.1  $33.1  $226.6  $90.5  
Add: Allocated undistributed net earnings to unvested restricted stockholders
—  —  0.1  0.1  
Less: Undistributed net earnings reallocated to unvested restricted stockholders
—  —  (0.1) (0.1) 
Net earnings available to common stockholders - diluted$100.1  $33.1  $226.6  $90.5  
Denominator:
Weighted average number of common shares outstanding - basic155.6  154.5  155.1  154.6  
Effect of contingently issuable shares 0.1  0.3  0.1  0.2  
Effect of unvested restricted stock units0.2  0.2  0.2  0.2  
Weighted average number of common shares outstanding - diluted under two-class
155.9  155.0  155.4  155.0  
Effect of unvested restricted stock - participating security—  0.3  —  0.3  
Weighted average number of common shares outstanding - diluted under treasury stock
155.9  155.3  155.4  155.3  
Diluted net earnings per common share$0.64  $0.21  $1.46  $0.58