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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2015
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 |  | Six Months Ended
| June 30, |  | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Shares repurchased | 0.8 |  |  | 1.1 |  |  | 0.9 |  |  | 3.6 |
Aggregate purchase price | $ | 50.0 |  |  | $ | 64.1 |  |  | $ | 59.1 |  |  | $ | 179.8 |
Average purchase price per share | $ | 62.78 |  |  | $ | 56.05 |  |  | $ | 62.41 |  |  | $ | 50.53 |
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 |  | Six Months Ended
| June 30, |  | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Shares issued | 0.3 |  |  | 0.3 |  |  | 0.9 |  |  | 1.1 |
Proceeds from the exercise of stock options | $ | 6.3 |  |  | $ | 6.8 |  |  | $ | 18.8 |  |  | $ | 22.1 |
Average exercise price per share | $ | 24.96 |  |  | $ | 19.44 |  |  | $ | 21.55 |  |  | $ | 20.39 |
Restricted Stock Grants And Shares Surrendered to Satisfy Tax Withholdings | 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,
| 2015 |  | 2014 |  | 2015 |  | 2014
Shares issued | 1,754 |  |  | 4,692 |  |  | 157,082 |  |  | 149,880 |
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock | 26,928 |  |  | 33,274 |  |  | 35,927 |  |  | 44,477 |

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- Definition Tabular disclosure of shares of common stock issued in connection with grants of restricted stock and shares surrendered to the company to satisfy tax withholding obligations in connection with the vesting of restricted stock. + References No definition available. + Details
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- Definition Tabular disclosure of shares issued in connection with the exercise of stock options including the total proceeds received and the average exercise price per share. + References No definition available. + Details
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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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