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Shareholders' Equity
 6 Months Ended
Jun. 30, 2016
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
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Shares repurchased
1.0

 
0.8

 
8.9

 
0.9

Aggregate purchase price
$
50.0

 
$
50.0

 
$
420.6

 
$
59.1

Average purchase price per share
$
48.51

 
$
62.78

 
$
47.35

 
$
62.41



As of June 30, 2016, $125.0 million remained available for share repurchases under the program.
A summary of shares of common stock issued in connection with the exercise of stock options follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Shares issued
0.1

 
0.3

 
0.1

 
0.9

Proceeds from the exercise of stock options
$
2.6

 
$
6.3

 
$
3.2

 
$
18.8

Average exercise price per share
$
26.93

 
$
24.96

 
$
26.08

 
$
21.55



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 (in actual number of shares):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Shares issued
—

 
1,754

 
138,424

 
157,082

Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock
24,125

 
26,928

 
32,885

 
35,927