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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2020
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
 
March 31,
2020

March 31,
2019
Numerator (basic and diluted):
 
 
 

Net income
$
22.5

 
$
17.4

Less: Dividends paid to participating securities
(0.3
)
 
(0.1
)
Undistributed and distributed earnings available to common stockholders
$
22.2

 
$
17.3

 
 
 
 
Denominator:
 

 
 

Average number of common shares outstanding
30,712.3

 
30,620.6

Effect of dilutive stock-based compensation
197.7

 
96.1

Average number of common and potential common shares outstanding
30,910.0

 
30,716.7