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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Stockholders' Equity Note [Abstract]  
Shares Repurchased Under Share Repurchase Program
A summary of shares repurchased under our stock repurchase program authorized by our Board of Directors follows:
202120202019
Shares repurchased22.3 7.2 1.3 
Aggregate purchase price$2,303.2 $382.3 $44.7 
Average purchase price per share$103.18 $52.76 $35.51 
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:
202120202019
Shares issued1.0 1.1 0.4 
Proceeds from the exercise of stock options$54.5 $52.7 $12.7 
Average exercise price per share$53.13 $49.91 $33.87 
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:
202120202019
Shares issued0.7 0.5 0.3 
Shares surrendered to AutoNation to satisfy tax withholding obligations
0.2 0.2 0.1