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Net Income Per Share(Tables)
 3 Months Ended
Mar. 31, 2014
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
 
March 31,
2014
 
March 31,
2013
Numerator (basic and diluted):
 
 
 
Net income
$
23.2

 
$
30.1

Less: Dividends paid to participating securities
(0.1
)
 
(0.1
)
Less: Undistributed earnings available to participating securities
(0.1
)
 
(0.2
)
Undistributed and distributed earnings available to common stockholders
$
23.0

 
$
29.8

 
 
 
 
Denominator:
 
 
 
Average number of common shares outstanding
30,665.9

 
30,945.6

Effect of dilutive stock-based compensation
112.3

 
163.3

Average number of common and potential common shares outstanding
30,778.2

 
31,108.9