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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
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,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
Numerator (basic and diluted):
 
 
 

 
 
 
 
Net income
$
22.3

 
$
26.0

 
$
36.0

 
$
47.1

Less: Dividends paid to participating securities
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
Less: Undistributed earnings available to participating securities
(0.1
)
 
(0.2
)
 
(0.1
)
 
(0.2
)
Undistributed and distributed earnings available to common stockholders
$
22.1

 
$
25.8

 
$
35.7

 
$
46.8

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Average number of common shares outstanding
30,412.9

 
30,313.2

 
30,389.0

 
30,304.1

Effect of dilutive stock-based compensation
133.8

 
134.5

 
128.1

 
131.1

Average number of common and potential common shares outstanding
30,546.7

 
30,447.7

 
30,517.1

 
30,435.2