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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Assumptions Used | The table below summarizes the assumptions used to calculate the fair value of service-based stock options by year of grant:
|  | 2018 |  | 2017
Weighted average expected life (in years) |  | 6.0 |  |  | 6.0 |
Weighted average exercise price |  | $ | 158.23 |  |  | $ | 104.95 |
Expected stock price volatility |  | 27.35 | % |  | 30.67 | %
Risk-free interest rate |  | 2.69 | % |  | 2.13 | %
Weighted average fair value |  | $ | 51.27 |  |  | $ | 35.58 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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