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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Assumptions and Fair Values for RSUs Granted in the Period
The assumptions and fair value for the RSUs granted during the nine months ended September 30, 2018 are included in the following table on a per share basis.
 
2018
Fair value of RSUs granted
$
37.13

Expected term (years)
4

Expected volatility

Expected dividend yield
1.68
%
Risk-free rate
2.26
%