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Net Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
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)
 
2017
 
2016
 
2015
Basic Net Earnings Per Common Share:
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
Net earnings available to common stockholders
 
$
814.9

 
$
486.4

 
$
335.4

Distributed and allocated undistributed net earnings to non-vested restricted stockholders
 
(4.9
)
 
(3.4
)
 
(2.2
)
Distributed and allocated undistributed net earnings to common stockholders
 
810.0

 
483.0

 
333.2

Distributed net earnings - dividends paid to common stockholders
 
(118.7
)
 
(118.7
)
 
(106.2
)
Allocation of undistributed net earnings to common stockholders
 
$
691.3

 
$
364.3

 
$
227.0

Denominator
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
186.9

 
194.3

 
203.9

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

 
$
0.61

 
$
0.52

Allocated undistributed net earnings to common stockholders
 
3.69

 
1.88

 
1.11

  Basic net earnings per common share
 
$
4.33

 
$
2.49

 
$
1.63

Diluted Net Earnings Per Common Share:
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
Distributed and allocated undistributed net earnings to common stockholders
 
$
810.0

 
$
483.0

 
$
333.2

Add: Allocated undistributed net earnings to unvested restricted stockholders
 
4.3

 
2.6

 
1.6

Less: Undistributed net earnings reallocated to non-vested restricted stockholders
 
(4.3
)
 
(2.6
)
 
(1.6
)
Net earnings available to common stockholders - diluted
 
$
810.0

 
$
483.0

 
$
333.2

Denominator
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
186.9

 
194.3

 
203.9

Effect of contingently issuable shares
 
0.7

 
1.2

 
1.3

Effect of unvested restricted stock units
 
0.7

 
0.7

 
0.7

Weighted average number of common shares outstanding - diluted under two-class
 
188.3

 
196.2

 
205.9

Effect of unvested restricted stock - participating security
 
0.6

 
1.0

 
0.8

Weighted average number of common shares outstanding - diluted under treasury stock
 
188.9

 
197.2

 
206.7

Diluted net earnings per common share
 
$
4.29

 
$
2.46

 
$
1.62