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Net Income Per Share (Tables)
 9 Months Ended
Sep. 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

Nine Months Ended
 
September 30,
2018

September 30,
2017

September 30,
2018

September 30,
2017
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
41.0

 
$
25.8

 
$
87.3

 
$
61.8

Less: Dividends paid to participating securities
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.3
)
Less: Undistributed earnings available to participating securities
(0.2
)
 
(0.1
)
 
(0.4
)
 
(0.2
)
Undistributed and distributed earnings available to common stockholders
$
40.7

 
$
25.6

 
$
86.7

 
$
61.3

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
30,569.6

 
30,422.8

 
30,541.6

 
30,400.4

Effect of dilutive stock-based compensation
153.2

 
146.7

 
141.5

 
134.3

Average number of common and potential common shares outstanding
30,722.8

 
30,569.5

 
30,683.1

 
30,534.7