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Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Fair Value and Assumptions
The estimated fair value of our 2015 SARs awards and related underlying assumptions are shown in the table below.
 
2015
Estimated fair value
$
18.16

Quarterly dividend rate
$
0.38

Expected term of stock appreciation rights, in years
4.7

Risk-free interest rate
1.2
%
Dividend yield
2.6
%
Expected stock price volatility
29.2
%
Present value of dividends
$
6.90