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Stock Option and Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2012
Stock Option and Incentive Plans |
Summary of the Company's stock option plan activity |
|  | Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |
--- | --- | --- | --- | --- | --- | --- | ---
Unexercised options outstanding—January 1, 2012 |  |  | 5.1 |  | $ | 68.18 |  |  |  |
Options granted |  |  | 0.0 |  |  | 107.63 |  |  |  |
Options exercised |  |  | (0.3 | ) |  | 51.76 |  |  |  |
Options forfeited |  |  | (0.0 | ) |  | 116.35 |  |  |  |
Unexercised options outstanding—March 31, 2012 |  |  | 4.8 |  |  | 69.19 |  |  | 4.3 |
Exercisable at March 31, 2012 |  |  | 2.7 |  |  | 62.91 |  |  | 3.6 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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