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Shareholders' Equity
 3 Months Ended
Mar. 31, 2014
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,
 
2014
 
2013
Shares repurchased
2.4

 
0.1

Aggregate purchase price
$
115.7

 
$
2.2

Average purchase price per share
$
47.92

 
$
39.42



In January 2014, our Board of Directors authorized the repurchase of an additional $250 million of shares of our common stock. As of March 31, 2014, $400.0 million remained available under our stock repurchase authorization limit.
A summary of shares of common stock issued in connection with the exercise of stock options follows:
 
Three Months Ended
 
March 31,
 
2014
 
2013
Shares issued
0.7

 
0.4

Proceeds from the exercise of stock options
$
15.3

 
$
7.9

Average exercise price per share
$
20.84

 
$
19.49



The following table presents a summary of shares of common stock issued in connection with grants of restricted stock and shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock:
 
Three Months Ended
 
March 31,
 
2014
 
2013
Shares issued
145,188

 
137,144

Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock
11,203

 
6,131