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Net Income Per Share(Tables)
 9 Months Ended
Sep. 30, 2013
Net Income 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,
2013
 
September 30,
2012
 
September 30,
2013
 
September 30,
2012
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
29.1

 
$
27.7

 
$
85.8

 
$
63.3

Less: Dividends paid to participating securities
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
Less: Undistributed earnings available to participating securities
(0.2
)
 
(0.3
)
 
(0.6
)
 
(0.7
)
Undistributed and distributed earnings available to common stockholders
$
28.8

 
$
27.4

 
$
85.0

 
$
62.5

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
31,092.6

 
30,659.9

 
31,042.2

 
31,097.4

Effect of dilutive stock-based compensation
187.7

 
392.7

 
171.1

 
362.9

Average number of common and potential common shares outstanding
31,280.3

 
31,052.6

 
31,213.3

 
31,460.3