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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation A summary of share-based compensation is as follows:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2013 |  | 2014 |  | 2013 |  | 2014
Share-based compensation | $ | 5.7 |  |  | $ | 8.7 |  |  | $ | 11.5 |  |  | $ | 15.2 |
Tax benefit | 2.2 |  |  | 3.4 |  |  | 4.4 |  |  | 5.8 |
There was $79.3 million and $70.5 million of unrecognized share-based compensation as of December 31, 2013 and June 30, 2014, respectively, which will be recognized over a weighted-average period of approximately three years (assuming no forfeitures). 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, 2013 | 3.0 |  |  | $ | 77.71 |  |  |
Options granted | 0.0 |  |  | 186.34 |  |  |
Options exercised | (0.4 | ) |  | 66.27 |  |  |
Options forfeited | (0.0 | ) |  | 81.50 |  |  |
Unexercised options outstanding—June 30, 2014 | 2.6 |  |  | 79.30 |  |  | 3.0
Exercisable at June 30, 2014 | 2.0 |  |  | 75.04 |  |  | 2.8
Restricted Stock The following table summarizes the transactions of the Company's restricted stock units:
| Restricted Stock |  | Weighted Average Grant Date Value
Unvested units—December 31, 2013 | 0.5 |  |  | $ | 176.38 |
Units granted | 0.0 |  |  | 189.63 |
Units vested | (0.1 | ) |  | 132.88 |
Units forfeited | (0.0) |  |  | 122.72 |
Unvested units—June 30, 2014 | 0.4 |  |  | 183.39 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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