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Income Per Common Share Computations
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Common Share Computations
The following is a reconciliation of the numerator and denominator of the net income per common share computations:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions, except per share data)
2017
 
2016
 
2017
 
2016
Numerator for basic income per common share:
 
 
 
 
 
 
 
Net income
$
78.3

 
$
69.8

 
$
85.6

 
$
72.6

Net income allocated to participating securities
—

 
(1.3
)
 
(0.1
)
 
(1.3
)
Numerator for basic income per common share
$
78.3

 
$
68.5

 
$
85.5

 
$
71.3

 
 
 
 
 
 
 
 
Numerator for diluted income per common share
$
78.3

 
$
69.8

 
$
85.6

 
$
72.6

 
 
 
 
 
 
 
 
Denominator for basic and diluted net income per common share:
 
 
 
 
 
 
 
Basic
16.1

 
16.5

 
16.2

 
16.5

Plus dilutive effect of stock awards
0.2

 
0.2

 
0.2

 
0.2

Plus dilutive effect of participating securities
—

 
0.3

 
0.1

 
0.3

Diluted
16.3

 
17.0

 
16.5

 
17.0

 
 
 
 
 
 
 
 
Income per common share:
 
 
 
 
 
 
 
Basic
$
4.86

 
$
4.16

 
$
5.27

 
$
4.32

Diluted
$
4.81

 
$
4.11

 
$
5.18

 
$
4.27