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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
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 Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Shares repurchased
—

 
9.2

 
2.1

 
10.1

Aggregate purchase price
$
—

 
$
400.0

 
$
100.0

 
$
434.9

Average purchase price per share
$
—

 
$
43.28

 
$
47.58

 
$
42.99
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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Shares issued
0.1

 
0.1

 
0.4

 
0.7

Proceeds from the exercise of stock options
$
1.8

 
$
1.9

 
$
16.0

 
$
24.7

Average exercise price per share
$
16.67

 
$
35.27

 
$
39.20

 
$
33.77
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 grants of restricted stock and settlement of restricted stock units (“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
 
Nine Months Ended
 
September 30,
 
September 30,
(In actual number of shares)
2018
 
2017
 
2018
 
2017
Shares issued
—

 
—

 
122,661

 
20,000

Shares surrendered to AutoNation to satisfy tax withholding obligations
—

 
141

 
55,420

 
26,061