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Net Earnings (Loss) Per Common Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
(In millions, except per share amounts)
 
2019
 
2018
Basic Net Earnings (Loss) Per Common Share:
 
 
 
 
Numerator:
 
 
 
 
Net earnings (loss)
 
$
57.5

 
$
(200.6
)
Distributed and allocated undistributed net earnings to unvested restricted stockholders
 
(0.1
)
 
(0.2
)
Distributed and allocated undistributed net earnings (loss)
 
57.4

 
(200.8
)
Distributed net earnings - dividends paid to common stockholders
 
(24.8
)
 
(26.3
)
Allocation of undistributed net earnings (loss) to common stockholders
 
$
32.6

 
$
(227.1
)
Denominator:
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.8

 
165.3

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

 
$
0.16

Allocated undistributed net earnings (loss) to common stockholders
 
0.21

 
(1.37
)
Basic net earnings (loss) per common share
 
$
0.37

 
$
(1.21
)
Diluted Net Earnings (Loss) Per Common Share:
 
 
 
 
Numerator:
 
 
 
 
Distributed and allocated undistributed net earnings (loss)
 
$
57.4

 
$
(200.8
)
Add: Allocated undistributed net earnings to unvested restricted stockholders
 
0.1

 
—

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

Net earnings (loss) available to common stockholders - diluted
 
$
57.4

 
$
(200.8
)
Denominator:
 
 
 
 
Weighted average number of common shares outstanding - basic
 
154.8

 
165.3

Effect of contingently issuable shares
 
0.2

 
—

Effect of unvested restricted stock units
 
0.2

 
—

Weighted average number of common shares outstanding - diluted under two-class
 
155.2

 
165.3

Effect of unvested restricted stock - participating security
 
0.2

 
—

Weighted average number of common shares outstanding - diluted under treasury stock
 
155.4

 
165.3

Diluted net earnings (loss) per common share
 
$
0.37

 
$
(1.21
)