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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-Based Compensation | The following table presents share-based compensation expense:
| For the Three Months Ended March 31,
| 2017 |  | 2018
Share-based compensation | $ | 9.4 |  |  | $ | 10.7 |
Tax benefit | 3.6 |  |  | 2.7 |
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, 2017 | 0.6 |  |  | $ | 122.04 |  |  |
Options granted | 0.0 |  |  | 203.22 |  |  |
Options exercised | (0.0 | ) |  | 98.69 |  |  |
Options forfeited | — |  |  | — |  |  |
Unexercised options outstanding - March 31, 2018 | 0.6 |  |  | 124.49 |  |  | 3.8
Exercisable at March 31, 2018 | 0.2 |  |  | 120.03 |  |  | 2.0
Schedule of Fair Value of Options Granted and Assumptions | The weighted average grant date assumptions used to estimate the fair value of options granted were as follows:
|  | For the Three Months Ended March 31,
|  | 2017 |  | 2018
Dividend yield |  | 0.5 | % |  | 0.7 | %
Expected volatility |  | 30.1 | % |  | 24.6 | %
Risk-free interest rate |  | 2.2 | % |  | 2.6 | %
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, 2017 | 0.4 |  |  | $ | 162.32 |
Units granted | 0.2 |  |  | 203.23 |
Units vested | (0.0 | ) |  | 204.40 |
Units forfeited | (0.0 | ) |  | 173.41 |
Unvested units - March 31, 2018 | 0.6 |  |  | 172.59 |

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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