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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
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:
20202019
Risk-free interest rate0.15 %2.23 %
Expected volatility27.52 %19.64 %
Weighted-average fair value of units granted $92.25  $123.44  
Share payout100.90 %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:
20202019
Expected dividend yield3.51 %2.94 %
Risk-free interest rate1.26 %2.60 %
Expected life (in years)7.57.5
Expected volatility19.25 %17.79 %
Weighted-average fair value of options granted$11.74  $16.34