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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Share-Based Compensation | The following is a summary of share-based compensation expense:
| For the Three Months Ended March 31,
| 2015 |  | 2016
Share-based compensation | $ | 8.0 |  |  | $ | 9.2 |
Tax benefit | 3.1 |  |  | 3.6 |
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, 2015 | 1.4 |  |  | $ | 96.18 |  |  |
Options granted | 0.4 |  |  | 122.40 |  |  |
Options exercised | (0.1 | ) |  | 80.32 |  |  |
Unexercised options outstanding - March 31, 2016 | 1.7 |  |  | 103.09 |  |  | 3.1
Exercisable at March 31, 2016 | 1.3 |  |  | 95.19 |  |  | 1.9
Schedule of Fair Value of Options Granted and Assumptions | The weighted average fair value of options granted during the three months ended March 31, 2015 and 2016 was $53.59 and $38.90 per option, respectively, based on the weighted-average grant date assumptions stated below.
|  | For the Three Months Ended March 31,
|  | 2015 |  | 2016
Dividend yield |  | — | % |  | — | %
Expected volatility(1) |  | 27.9 | % |  | 30.6 | %
Risk-free interest rate(2) |  | 1.4 | % |  | 1.6 | %
Expected life of options (in years)(3) |  | 5.0 |  |  | 5.7 |
Forfeiture rate |  | — | % |  | — | %
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(1) | Expected volatility is based on historical and implied volatility.
(2) | Risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of the grant.
(3) | Expected life of options (in years) is based on the Company’s historical data and expected exercise behavior.
Schedule of Company Restricted Stock Unit Transactions | The following table summarizes the transactions of the Company’s restricted stock units:
| Restricted Stock Units |  | Weighted Average Grant Date Value
Unvested units - December 31, 2015 | 0.6 |  |  | $ | 192.04 |
Units granted | 0.2 |  |  | 122.43 |
Units vested | (0.2 | ) |  | 181.00 |
Units forfeited | (0.0) |  |  | 197.79 |
Unvested units - March 31, 2016 | 0.6 |  |  | 169.57 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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