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Net Earnings (Loss) Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Earnings Per Common Share
The following table shows the calculation of basic and diluted net earnings (loss) per common share under the two-class method:
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions, except per share amounts)
 
2018
 
2017
 
2018
 
2017
Basic Net Earnings (Loss) Per Common Share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Net earnings (loss)
 
$
79.0

 
$
787.5

 
$
(7.2
)
 
$
848.4

Distributed and allocated undistributed net earnings to unvested restricted stockholders
 
(0.4
)
 
(5.0
)
 
(0.4
)
 
(5.3
)
Distributed and allocated undistributed net earnings (loss)
 
78.6

 
782.5

 
(7.6
)
 
843.1

Distributed net earnings - dividends paid to common stockholders
 
(25.0
)
 
(30.1
)
 
(76.9
)
 
(91.5
)
Allocation of undistributed net earnings (loss) to common stockholders
 
$
53.6

 
$
752.4

 
$
(84.5
)
 
$
751.6

Denominator:
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
157.2

 
186.9

 
160.8

 
190.9

Basic net earnings per common share:
 
 
 
 
 
 
 
 
Distributed net earnings
 
$
0.16

 
$
0.16

 
$
0.48

 
$
0.48

Allocated undistributed net earnings (loss) to common stockholders
 
0.34

 
4.03

 
(0.53
)
 
3.94

Basic net earnings (loss) per common share
 
$
0.50

 
$
4.19

 
$
(0.05
)
 
$
4.42

Diluted Net Earnings (Loss) Per Common Share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Distributed and allocated undistributed net earnings (loss)
 
$
78.6

 
$
782.5

 
$
(7.6
)
 
$
843.1

Add: Allocated undistributed net earnings to unvested restricted stockholders
 
0.3

 
4.8

 
—

 
4.8

Less: Undistributed net earnings reallocated to unvested restricted stockholders
 
(0.3
)
 
(4.8
)
 
—

 
(4.8
)
Net earnings (loss) available to common stockholders - diluted
 
$
78.6

 
$
782.5

 
$
(7.6
)
 
$
843.1

Denominator:
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
157.2

 
186.9

 
160.8

 
190.9

Effect of contingently issuable shares
 
0.1

 
0.7

 
—

 
0.7

Effect of unvested restricted stock units
 
0.3

 
0.7

 
—

 
0.7

Weighted average number of common shares outstanding - diluted under two-class
 
157.6

 
188.3

 
160.8

 
192.3

Effect of unvested restricted stock - participating security
 
0.4

 
0.6

 
—

 
0.6

Weighted average number of common shares outstanding - diluted under treasury stock
 
158.0

 
188.9

 
160.8

 
192.9

Diluted net earnings (loss) per common share
 
$
0.50

 
$
4.15

 
$
(0.05
)
 
$
4.37