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Income Per Common Share Computations (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
Three Months Ended March, 31
(in millions, except per share data)
2018
 
2017
Numerator for basic net income per common share:
 
 
 
Net income from continuing operations
$
14.1

 
$
2.2

Net income from continuing operations allocated to participating securities
—

 
(0.1
)
Net income from discontinued operations
167.9

 
5.1

Numerator for basic net income per common share
$
182.0

 
$
7.2

 
 
 
 
Numerator for diluted net income from continuing operations per common share
$
14.1

 
$
2.2

Numerator for diluted net income per common share:
$
182.0

 
$
7.3

 
 
 
 
Denominator for net income per common share:
 
 
 
Basic
14.4

 
16.3

Plus dilutive effect of stock awards
0.1

 
0.2

Plus dilutive effect of participating securities
—

 
0.3

Diluted
14.5

 
16.8

 
 
 
 
Net income per common share data:
 
 
 
Basic
 
 
 
Continuing operations
$
0.98

 
$
0.13

Discontinued operations
$
11.63

 
$
0.31

Net income per common share - basic
$
12.61

 
$
0.44

 
 
 
 
Diluted
 
 
 
Continuing operations
$
0.97

 
$
0.13

Discontinued operations
$
11.58

 
$
0.31

Net income per common share - diluted
$
12.55

 
$
0.44