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Net Income Per Share (Tables)
 9 Months Ended
Sep. 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 EndedNine Months Ended
September 30,
2021		September 30,
2020		September 30,
2021		September 30,
2020
Numerator (basic and diluted):  
Net income$12.2 $24.5 $35.6 $68.5 
Less: Dividends paid to participating securities(0.2)(0.1)(0.5)(0.5)
Less: Undistributed earnings available to participating securities— (0.2)— (0.4)
Undistributed and distributed earnings available to common stockholders$12.0 $24.2 $35.1 $67.6 
Denominator:  
Average number of common shares outstanding31,046.1 30,909.7 31,022.1 30,805.3 
Effect of dilutive stock-based compensation354.9 232.8 359.5 214.8 
Average number of common and potential common shares outstanding31,401.0 31,142.5 31,381.6 31,020.1