Shareholders' Equity (Tables)
| 9 Months Ended |
|---|
Sep. 30, 2011 |
|---|
| Stockholders' Equity Note [Abstract] | |
| Shares Repurchased Under Share Repurchase Program | | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | September 30, | | September 30, | | 2011 | | 2010 | | 2011 | | 2010 | Shares repurchased | 5.7 |
| | 2.9 |
| | 10.8 |
| | 25.9 |
| Aggregate purchase price | $ | 195.9 |
| | $ | 55.0 |
| | $ | 365.6 |
| | $ | 506.6 |
| Average purchase price per share | $ | 34.66 |
| | $ | 19.08 |
| | $ | 33.85 |
| | $ | 19.59 |
|
|
| Common Stock Issued With The Exercise Of Stock Options | | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | September 30, | | September 30, | | 2011 | | 2010 | | 2011 | | 2010 | Shares issued | 1.4 |
| | 1.6 |
| | 3.8 |
| | 1.9 |
| Proceeds from exercise of stock options | $ | 26.3 |
| | $ | 24.5 |
| | $ | 66.3 |
| | $ | 30.1 |
| Average exercise price per share | $ | 18.35 |
| | $ | 15.35 |
| | $ | 17.54 |
| | $ | 15.53 |
|
|
| Restricted Stock Grants And Shares Surrendered to Satisfy Tax Withholdings | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | September 30, | | September 30, | | 2011 | | 2010 | | 2011 | | 2010 | Shares issued | — |
| | — |
| | 163,892 |
| | 188,740 |
| Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock | 11,688 |
| | 12,796 |
| | 42,985 |
| | 33,485 |
|
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