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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Fair Value of Employee Stock Options Granted and Determined by Black-Scholes Valuation Model Assumptions | The weighted-average assumptions used and the calculated weighted-average fair values of the first measurement period for the 2020 LTIP and the RTSR portion of the 2019 LTIP are as follows:
| 2020 |  | 2019 |
Risk-free interest rate | 0.15 | % |  | 2.23 | % |
Expected volatility | 27.52 | % |  | 19.64 | % |
Weighted-average fair value of units granted | $ | 92.25 |  |  | $ | 123.44 |  |
Share payout | 100.90 | % |  | 115.04 | % |
The fair value of each option grant is estimated using the Black-Scholes option pricing model. The weighted-average assumptions used and the calculated weighted-average fair values of options granted in 2020 and 2019 are as follows:
| 2020 |  | 2019 |  |
Expected dividend yield | 3.51 | % |  | 2.94 | % |  |
Risk-free interest rate | 1.26 | % |  | 2.60 | % |  |
Expected life (in years) | 7.5 |  | 7.5 |  |
Expected volatility | 19.25 | % |  | 17.79 | % |  |
Weighted-average fair value of options granted | $ | 11.74 |  |  | $ | 16.34 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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