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Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 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 EndedNine Months Ended
September 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Numerator (basic and diluted):  
Net income$24.5 $27.7 $68.5 $65.6 
Less: Dividends paid to participating securities(0.1)— (0.5)(0.2)
Less: Undistributed earnings available to participating securities(0.2)(0.1)(0.4)(0.2)
Undistributed and distributed earnings available to common stockholders$24.2 $27.6 $67.6 $65.2 
Denominator:  
Average number of common shares outstanding30,909.7 30,662.8 30,805.3 30,648.4 
Effect of dilutive stock-based compensation232.8 169.1 214.8 156.3 
Average number of common and potential common shares outstanding31,142.5 30,831.9 31,020.1 30,804.7