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Stock Repurchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock Repurchase Plan [Abstract] |
Schedule of stock repurchase activity |
|  | Number of shares repurchased |  |  | Average price paid per share |  |  | Amount available for future repurchases (in millions) |
2010 |  |  | 687,340 |  |  | $ | 168.06 |  |  | $ | 107.7 |
2011 |  |  | 1,581,444 |  |  | $ | 128.15 |  |  | $ | 80.0 |
2012 |  |  | 484,841 |  |  | $ | 51.56 |  |  | $ | 95.0 |

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- Definition Schedule of stock repurchase activity. + References No definition available. + Details
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