Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Tables)

v3.8.0.1
Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Fair Value Assumptions for Performance Awards
The fair values of the senior executives' performance share award grants with a TSR modifier for grants in 2018 and 2017 were $61.59 and $64.82, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
 
2018
 
2017
Risk-free interest rate
2.4
%
 
1.5
%
Dividend yield
1.3
%
 
1.1
%
Volatility factor
38.9
%
 
38.3
%
Expected life of award
2.9 years

 
2.9 years