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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, |  | For the Six Months Ended June 30,
| 2016 |  | 2017 |  | 2016 |  | 2017
Share-based compensation | $ | 10.8 |  |  | $ | 10.3 |  |  | $ | 20.0 |  |  | $ | 19.7 |
Tax benefit | 4.2 |  |  | 4.0 |  |  | 7.7 |  |  | 7.6 |
Schedule of Company Stock Option Transactions | The following table summarizes transactions in the Company’s stock options:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years)
Unexercised options outstanding - December 31, 2016 | 1.4 |  |  | $ | 108.53 |  |  |
Options granted | 0.0 |  |  | 152.36 |  |  |
Options exercised | (0.6 | ) |  | 96.52 |  |  |
Options forfeited | 0.0 |  |  | 140.26 |  |  |
Unexercised options outstanding - June 30, 2017 | 0.8 |  |  | 116.71 |  |  | 3.6
Exercisable at June 30, 2017 | 0.4 |  |  | 107.81 |  |  | 1.6
Schedule of Fair Value of Options Granted and Assumptions | For the six months ended June 30, 2016 and 2017, the weighted average fair value of options granted was $38.90 and $46.49, per option, respectively, based on the weighted-average grant date assumptions stated below.
|  | For the Six Months Ended June 30,
|  | 2016 |  | 2017
Dividend yield |  | — | % |  | 0.5 | %
Expected volatility |  | 30.6 | % |  | 30.1 | %
Risk-free interest rate |  | 1.6 | % |  | 2.2 | %
Expected life of options (in years) |  | 5.7 |  |  | 5.7 |
Forfeiture rate |  | — | % |  | — | %
Schedule of Company Restricted Stock Unit Transactions | The following table summarizes transactions in the Company’s restricted stock units:
| Restricted Stock Units |  | Weighted Average Grant Date Value
Unvested units - December 31, 2016 | 0.6 |  |  | $ | 168.84 |
Units granted | 0.2 |  |  | 152.89 |
Units vested | (0.2 | ) |  | 167.72 |
Units forfeited | (0.0 | ) |  | 170.52 |
Unvested units - June 30, 2017 | 0.6 |  |  | 162.92 |

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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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