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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2022
Stockholders' Equity Note [Abstract]  
Shares Repurchased Under Stock Repurchase Program
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 
Common Stock Issued With The Exercise Of Stock Options
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 
Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock And Restricted Stock Units
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