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Net Income Per Common Share Computations (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Calculation
The following is a reconciliation of the numerator and denominator of the net income per common share computations:
 
Years Ended December 31,
(in millions, except per share data)
2018
 
2017
 
2016
Numerator for basic net income per common share:
 
 
 
 
 
Net income from continuing operations
$
182.6

 
$
122.4

 
$
96.7

Net income from continuing operations allocated to participating securities
—

 
(0.1
)
 
(1.0
)
Net income from discontinued operations
170.2

 
18.1

 
11.4

Numerator for basic net income per common share
$
352.8

 
$
140.4

 
$
107.1

 
 
 
 
 
 
Numerator for diluted net income from continuing operations per common share
$
182.6

 
$
122.4

 
$
96.7

 
 
 
 
 
 
Numerator for diluted net income per common share
$
352.8

 
$
140.5

 
$
108.1

 
 
 
 
 
 
Denominator for net income per common share:
 
 
 
 
 
Basic
41.3

 
47.2

 
49.3

Plus dilutive effect of stock awards
0.3

 
0.6

 
0.6

Plus dilutive effect of participating securities
—

 
0.2

 
0.6

Diluted
41.6

 
48.0

 
50.5

 
 
 
 
 
 
Net income per common share data:
 
 
 
 
 
Basic
 
 
 
 
 
Continuing operations
$
4.42

 
$
2.59

 
$
1.94

Discontinued operations
$
4.12

 
$
0.38

 
$
0.23

Net income per common share - basic
$
8.54

 
$
2.97

 
$
2.17

 
 
 
 
 
 
Diluted
 
 


 


Continuing operations
$
4.39

 
$
2.55

 
$
1.92

Discontinued operations
$
4.09

 
$
0.37

 
$
0.22

Net income per common share - diluted
$
8.48

 
$
2.92

 
$
2.14