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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of transactions of the Company's stock options | The following table summarizes the 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 | (0.6 | ) |  | 64.13 |  |  |
Unexercised options outstanding—June 30, 2013 | 3.2 |  |  | 75.81 |  |  | 3.8
Exercisable at June 30, 2013 | 2.0 |  |  | 70.21 |  |  | 3.4
Summary of transactions of the Company's restricted stock | The following table summarizes the 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—June 30, 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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