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Share-Based Compensation | 3 Months Ended
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Mar. 31, 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 March 31,
| 2013 |  | 2014
Share-based compensation | $ | 5.8 |  |  | $ | 6.5 |
Tax benefit | 2.2 |  |  | 2.5 |
There was $79.3 million and $72.1 million of unrecognized share-based compensation as of December 31, 2013 and March 31, 2014, respectively, which will be recognized over a weighted-average period of approximately three years (assuming no forfeitures). As of March 31, 2014, 0.1 million options outstanding have expiration dates prior to the end of 2014. 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 exercised | (0.1 | ) |  | 71.38 |  |  |
Options forfeited | (0.1 | ) |  | 79.37 |  |  |
Unexercised options outstanding—March 31, 2014 | 2.8 |  |  | 77.90 |  |  | 3.2
Exercisable at March 31, 2014 | 2.3 |  |  | 73.80 |  |  | 3.0
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 vested | (0.1 | ) |  | 121.94 |
Units forfeited | 0.0 |  |  | 94.83 |
Unvested units—March 31, 2014 | 0.4 |  |  | 182.44 |

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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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