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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
2016
 
June 30,
2015
 
June 30,
2016
 
June 30,
2015
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
26.0

 
$
23.4

 
$
47.1

 
$
42.2

Less: Dividends paid to participating securities
—

 
—

 
(0.1
)
 
(0.2
)
Less: Undistributed earnings available to participating securities
(0.2
)
 
(0.3
)
 
(0.2
)
 
(0.3
)
Undistributed and distributed earnings available to common stockholders
$
25.8

 
$
23.1

 
$
46.8

 
$
41.7

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
30,313.2

 
30,274.3

 
30,304.1

 
30,226.6

Effect of dilutive stock-based compensation
134.5

 
122.7

 
131.1

 
118.8

Average number of common and potential common shares outstanding
30,447.7

 
30,397.0

 
30,435.2

 
30,345.4