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Net Income Per Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Net Income Per Share 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 

During the three months ended September 30, 2024 and 2023, there were 0.3 million and less than 0.1 million shares, respectively, from stock-based compensation plans not included in the computation of diluted net income per share because their impact was antidilutive. There were 0.3 million and 0.1 million antidilutive shares excluded during the nine months ended September 30, 2024 and 2023, respectively.
In February 2023, the Board of Directors approved a share repurchase program under which we may repurchase up to $1.0 billion in shares of common stock. The share repurchase program does not have an expiration date under which we may repurchase common stock on the open market or in privately-negotiated transactions. The number of shares to be repurchased and the timing of such transactions will depend on a variety of factors, including market conditions. The below table summarizes the details of the Company's repurchases of common stock under this program:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Shares repurchased170,771 77,329 1,409,786 753,399 
Total cost of repurchases ($ in millions)$52.4 $27.8 $506.5 $261.3 
Average price per repurchased share$306.34 $360.25 $359.24 $346.86