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Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Basic to Diluted Net Income Per Share
The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:
Three Months Ended
September 30,
Nine Months Ended
September 30,
($ in millions)2024202320242023
Net income$136.0 $161.3 $362.6 $456.4 
Weighted average common shares outstanding72.8 74.3 73.1 74.4 
Dilutive effect of equity awards, based on the treasury stock method
0.6 1.0 0.7 1.1 
Weighted average shares assuming dilution73.4 75.3 73.8 75.5 
Schedule of Repurchase of Common Stock The below table summarizes the details of the Company's repurchases of common stock under this program:
Three Months Ended
September 30,
Nine Months Ended
September 30,
2024202320242023
Shares repurchased170,771 77,329 1,409,786 753,399 
Total cost of repurchases ($ in millions)$52.4 $27.8 $506.5 $261.3 
Average price per repurchased share$306.34 $360.25 $359.24 $346.86