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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2015
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,
| 2014 |  | 2015 |  | 2014 |  | 2015
Share-based compensation | $ | 8.7 |  |  | $ | 9.1 |  |  | $ | 15.2 |  |  | $ | 17.1 |
Tax benefit | 3.4 |  |  | 3.5 |  |  | 5.8 |  |  | 6.6 |
There was $56.8 million and $86.3 million of unrecognized share-based compensation as of December 31, 2014 and June 30, 2015, 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, 2014 | 2.3 |  |  | $ | 83.42 |  |  |
Options granted | 0.0 |  |  | 199.86 |  |  |
Options exercised | (0.9 | ) |  | 65.60 |  |  |
Options forfeited | (0.0 | ) |  | 101.29 |  |  |
Unexercised options outstanding—June 30, 2015 | 1.4 |  |  | 94.29 |  |  | 2.5
Exercisable at June 30, 2015 | 1.3 |  |  | 91.76 |  |  | 2.4
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, 2014 | 0.4 |  |  | $ | 182.83 |
Units granted | 0.3 |  |  | 197.93 |
Units vested | (0.2 | ) |  | 174.19 |
Units forfeited | (0.0 | ) |  | 190.76 |
Unvested units—June 30, 2015 | 0.5 |  |  | 192.10 |
Of the 0.3 million units granted in January 2015, 0.2 million contained service-based vesting conditions and the remaining 0.1 million vest if both a requisite service period and certain performance conditions have been satisfied. The fair values of the awards were based on the closing price of the Company’s common stock on the date of grant and will be recognized as compensation expense over a service period of four years.

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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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: 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 3: 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 4: 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 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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