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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
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,
2021		June 30,
2020		June 30,
2021		June 30,
2020
Numerator (basic and diluted):  
Net income$1.8 $21.5 $23.4 $44.0 
Less: Dividends paid to participating securities(0.2)(0.2)(0.3)(0.4)
Less: Undistributed earnings available to participating securities0.1 (0.1)— (0.2)
Undistributed and distributed earnings available to common stockholders$1.7 $21.2 $23.1 $43.4 
Denominator:  
Average number of common shares outstanding31,045.1 30,792.6 31,009.9 30,752.5 
Effect of dilutive stock-based compensation357.3 214.1 361.8 205.9 
Average number of common and potential common shares outstanding31,402.4 31,006.7 31,371.7 30,958.4