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Shareholders' Equity | 3 Months Ended
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Mar. 31, 2018
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,
| 2018 |  | 2017
Shares repurchased | 0.5 |  |  | — |
Aggregate purchase price | $ | 26.6 |  |  | $ | — |
Average purchase price per share | $ | 48.38 |  |  | $ | — |
As of March 31, 2018, $87.1 million remained available for share repurchases under the program. In April 2018, our Board of Directors authorized the repurchase of an additional $250 million of shares of our common stock. A summary of shares of common stock issued in connection with the exercise of stock options follows:
| Three Months Ended
| March 31,
| 2018 |  | 2017
Shares issued | 0.3 |  |  | 0.6 |
Proceeds from the exercise of stock options | $ | 13.3 |  |  | $ | 21.5 |
Average exercise price per share | $ | 51.15 |  |  | $ | 34.03 |
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 (in actual number of shares):
| Three Months Ended
| March 31,
| 2018 |  | 2017
Shares issued | 112,824 |  |  | — |
Shares surrendered to AutoNation to satisfy tax withholding obligations | 45,690 |  |  | 8,124 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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