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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of 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 |
Schedule of Company Stock Option Transactions | 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
Schedule of Company Restricted Stock Unit Transactions | 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 Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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