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Net Income Per Share(Tables)
 9 Months Ended
Sep. 30, 2014
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
 
Nine Months Ended
 
September 30,
2014
 
September 30,
2013
 
September 30,
2014
 
September 30,
2013
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
23.0

 
$
29.1

 
$
71.2

 
$
85.8

Less: Dividends paid to participating securities
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.2
)
Less: Undistributed earnings available to participating securities
(0.1
)
 
(0.2
)
 
(0.4
)
 
(0.6
)
Undistributed and distributed earnings available to common stockholders
$
22.8

 
$
28.8

 
$
70.5

 
$
85.0

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
30,098.3

 
31,092.6

 
30,284.9

 
31,042.2

Effect of dilutive stock-based compensation
127.2

 
187.7

 
117.8

 
171.1

Average number of common and potential common shares outstanding
30,225.5

 
31,280.3

 
30,402.7

 
31,213.3