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Income Per Common Share Computations
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
(in millions, except per share data)
2017
 
2016
 
2017
 
2016
Numerator for basic income per common share:
 
 
 
 
 
 
 
Net income
$
16.7

 
$
8.7

 
$
102.3

 
$
81.3

Net income allocated to participating securities
—

 
(0.1
)
 
(0.1
)
 
(1.4
)
Numerator for basic income per common share
$
16.7

 
$
8.6

 
$
102.2

 
$
79.9

 
 
 
 
 
 
 
 
Numerator for diluted income per common share
$
16.7

 
$
8.7

 
$
102.3

 
$
81.3

 
 
 
 
 
 
 
 
Denominator for basic and diluted net income per common share:
 
 
 
 
 
 
 
Basic-weighted average shares
15.3

 
16.4

 
15.9

 
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-adjusted weighted average shares
15.5

 
16.9

 
16.2

 
17.0

 
 
 
 
 
 
 
 
Income per common share:
 
 
 
 
 
 
 
Basic
$
1.09

 
$
0.52

 
$
6.43

 
$
4.85

Diluted
$
1.08

 
$
0.52

 
$
6.32

 
$
4.79