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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Assumptions and Fair Values for RSUs Granted in the Period The assumptions and fair value for the RSUs granted during the six months ended June 30, 2019 are included in the following table on a per share basis.
 
2019
Fair value of RSUs granted
$
39.65

Expected term (years)
4

Expected volatility
13.98
%
Risk-free rate
2.52
%