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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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:
Three Months EndedNine Months Ended
 September 30,September 30,
 2021202020212020
Shares repurchased7.9 — 19.2 2.5 
Aggregate purchase price$879.2 $— $1,921.4 $80.0 
Average purchase price per share$111.96 $— $100.13 $31.95 
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 EndedNine Months Ended
 September 30,September 30,
 2021202020212020
Shares issued 0.3 0.6 0.8 0.7 
Proceeds from the exercise of stock options $13.6 $30.5 $42.6 $31.5 
Average exercise price per share$54.27 $48.86 $51.80 $46.37 
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 EndedNine Months Ended
 September 30,September 30,
(In actual number of shares)2021202020212020
Shares issued13,610 10,896 652,802 512,917 
Shares surrendered to AutoNation to satisfy tax withholding obligations
6,318 4,288 230,451 190,888