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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Assumptions Used | The table below presents the weighted average fair value of service-based stock options by year of grant and the assumptions used in estimating those fair values:
|  | 2019 |  | 2018
Weighted average grant date fair value |  | $ | 58.28 |  |  | $ | 51.27 |
Weighted average expected life (in years) |  | 6.0 |  |  | 6.0 |
Weighted average exercise price |  | $ | 184.81 |  |  | $ | 158.23 |
Expected stock price volatility |  | 27.21 | % |  | 27.35 | %
Risk-free interest rate |  | 2.37 | % |  | 2.69 | %

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + 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=118255775&loc=d3e1928-114920 + Details
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