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Net Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
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)
 
2019
 
2018
 
2017
Basic Net Earnings Per Common Share:
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
Net earnings
 
$
263.0

 
$
193.1

 
$
814.9

Distributed and allocated undistributed net earnings to unvested restricted stockholders
 
(0.5
)
 
(0.9
)
 
(4.9
)
Distributed and allocated undistributed net earnings
 
262.5

 
192.2

 
810.0

Distributed net earnings - dividends paid to common stockholders
 
(98.7
)
 
(101.7
)
 
(118.7
)
Allocation of undistributed net earnings to common stockholders
 
$
163.8

 
$
90.5

 
$
691.3

Denominator
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.3

 
159.4

 
186.9

Basic net earnings per common share:
 
 
 
 
 
 
Distributed net earnings
 
$
0.64

 
$
0.64

 
$
0.64

Allocated undistributed net earnings to common stockholders
 
1.06

 
0.57

 
3.69

  Basic net earnings per common share
 
$
1.70

 
$
1.21

 
$
4.33

Diluted Net Earnings Per Common Share:
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
Distributed and allocated undistributed net earnings to common stockholders
 
$
262.5

 
$
192.2

 
$
810.0

Add: Allocated undistributed net earnings to unvested restricted stockholders
 
0.4

 
0.5

 
4.3

Less: Undistributed net earnings reallocated to unvested restricted stockholders
 
(0.4
)
 
(0.5
)
 
(4.3
)
Net earnings available to common stockholders - diluted
 
$
262.5

 
$
192.2

 
$
810.0

Denominator
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.3

 
159.4

 
186.9

Effect of contingently issuable shares
 
0.2

 
0.1

 
0.7

Effect of unvested restricted stock units
 
0.3

 
0.3

 
0.7

Weighted average number of common shares outstanding - diluted under two-class
 
154.8

 
159.8

 
188.3

Effect of unvested restricted stock - participating security
 
0.4

 
0.4

 
0.6

Weighted average number of common shares outstanding - diluted under treasury stock
 
155.2

 
160.2

 
188.9

Diluted net earnings per common share
 
$
1.69

 
$
1.20

 
$
4.29