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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period
The assumptions and fair values for the RSUs granted for the nine months ended September 30, 2015 are included in the following table on a per share basis.
 
2015
Fair value of RSUs granted
$
38.55

Expected term (years)
4

Expected volatility
—

Expected dividend yield
1.88
%
Risk-free rate
0.81
%