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Net Earnings (Loss) Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2019
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)
 
2019
 
2018
 
2019
 
2018
Basic Net Earnings (Loss) Per Common Share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Net earnings (loss)
 
$
68.0

 
$
79.0

 
$
158.7

 
$
(7.2
)
Distributed and allocated undistributed net earnings to unvested restricted stockholders
 
(0.1
)
 
(0.4
)
 
(0.3
)
 
(0.4
)
Distributed and allocated undistributed net earnings (loss)
 
67.9

 
78.6

 
158.4

 
(7.6
)
Distributed net earnings - dividends paid to common stockholders
 
(24.6
)
 
(25.0
)
 
(74.1
)
 
(76.9
)
Allocation of undistributed net earnings (loss) to common stockholders
 
$
43.3

 
$
53.6

 
$
84.3

 
$
(84.5
)
Denominator:
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.0

 
157.2

 
154.4

 
160.8

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
 
0.28

 
0.34

 
0.55

 
(0.53
)
Basic net earnings (loss) per common share
 
$
0.44

 
$
0.50

 
$
1.03

 
$
(0.05
)
Diluted Net Earnings (Loss) Per Common Share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Distributed and allocated undistributed net earnings (loss)
 
$
67.9

 
$
78.6

 
$
158.4

 
$
(7.6
)
Add: Allocated undistributed net earnings to unvested restricted stockholders
 
0.1

 
0.3

 
0.2

 
—

Less: Undistributed net earnings reallocated to unvested restricted stockholders
 
(0.1
)
 
(0.3
)
 
(0.2
)
 
—

Net earnings (loss) available to common stockholders - diluted
 
$
67.9

 
$
78.6

 
$
158.4

 
$
(7.6
)
Denominator:
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.0

 
157.2

 
154.4

 
160.8

Effect of contingently issuable shares
 
0.2

 
0.1

 
0.2

 
—

Effect of unvested restricted stock units
 
0.3

 
0.3

 
0.3

 
—

Weighted average number of common shares outstanding - diluted under two-class
 
154.5

 
157.6

 
154.9

 
160.8

Effect of unvested restricted stock - participating security
 
0.3

 
0.4

 
0.3

 
—

Weighted average number of common shares outstanding - diluted under treasury stock
 
154.8

 
158.0

 
155.2

 
160.8

Diluted net earnings (loss) per common share
 
$
0.44

 
$
0.50

 
$
1.02

 
$
(0.05
)