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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation
A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
 
Three Months Ended

Six Months Ended
 
June 30,
2018

June 30,
2017

June 30,
2018

June 30,
2017
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
25.8

 
$
22.3

 
$
46.3

 
$
36.0

Less: Dividends paid to participating securities
—

 
(0.1
)
 
(0.1
)
 
(0.2
)
Less: Undistributed earnings available to participating securities
(0.2
)
 
(0.1
)
 
(0.2
)
 
(0.1
)
Undistributed and distributed earnings available to common stockholders
$
25.6

 
$
22.1

 
$
46.0

 
$
35.7

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
30,565.8

 
30,412.9

 
30,527.4

 
30,389.0

Effect of dilutive stock-based compensation
140.1

 
133.8

 
135.6

 
128.1

Average number of common and potential common shares outstanding
30,705.9

 
30,546.7

 
30,663.0

 
30,517.1