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Net Income Per Share (Tables)
 6 Months Ended
Jun. 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 EndedSix Months Ended
June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Numerator (basic and diluted):  
Net income$21.5  $20.5  $44.0  $37.9  
Less: Dividends paid to participating securities(0.2) (0.1) (0.4) (0.2) 
Less: Undistributed earnings available to participating securities(0.1) (0.1) (0.2) (0.1) 
Undistributed and distributed earnings available to common stockholders$21.2  $20.3  $43.4  $37.6  
Denominator:  
Average number of common shares outstanding30,792.6  30,661.4  30,752.5  30,641.1  
Effect of dilutive stock-based compensation214.1  147.9  205.9  149.9  
Average number of common and potential common shares outstanding31,006.7  30,809.3  30,958.4  30,791.0