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Shareholders' Equity
 3 Months Ended
Mar. 31, 2022
Stockholders' Equity Note [Abstract]  
Shareholders' Equity SHAREHOLDERS’ EQUITY
A summary of shares repurchased under our stock repurchase program authorized by our Board of Directors follows:
Three Months Ended
 March 31,
 20222021
Shares repurchased3.5 3.8 
Aggregate purchase price$380.9 $306.1 
Average purchase price per share$110.04 $79.76 

As of March 31, 2022, $513.7 million remained available under our stock repurchase limit most recently authorized by our Board of Directors.
We have 5.0 million authorized shares of preferred stock, par value $0.01 per share, none of which are issued or outstanding. The Board of Directors has the authority to issue the preferred stock in one or more series and to establish the rights, preferences, and dividends of such preferred stock.
A summary of shares of common stock issued in connection with the exercise of stock options follows:
Three Months Ended
 March 31,
20222021
Shares issued (in actual number of shares)22,396 419,069 
Proceeds from the exercise of stock options $0.9 $21.2 
Average exercise price per share$38.21 $50.57 

The following table presents a summary of shares of common stock issued in connection with the settlement of RSUs, as well as shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock and settlement of RSUs:
Three Months Ended
 March 31,
20222021
Shares issued0.8 0.6 
Shares surrendered to AutoNation to satisfy tax withholding obligations
0.3 0.2