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Share-Based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Share-Based Compensation |
Schedule of transactions of the Company's stock options |
|  | Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |
--- | --- | --- | --- | --- | --- | --- | ---
Unexercised options outstanding—December 31, 2012 |  |  | 3.8 |  | $ | 74.04 |  |  |  |
Options exercised |  |  | (0.5 | ) |  | 65.30 |  |  |  |
Unexercised options outstanding—March 31, 2013 |  |  | 3.3 |  |  | 75.25 |  |  | 4.0 |
Exercisable at March 31, 2013 |  |  | 2.1 |  |  | 69.56 |  |  | 3.6 |
Summary of transactions of the Company's restricted stock |
|  | Restricted Stock |  | Weighted Average Grant Date Value |
--- | --- | --- | --- | --- | ---
Unvested units—December 31, 2012 |  |  | 0.4 |  | $ | 84.53 |
Units issued |  |  | (0.1 | ) |  | 85.63 |
Unvested units—March 31, 2013 |  |  | 0.3 |  |  | 84.49 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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