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Incentive, Retirement and Deferred Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2013
Compensation Related Costs [Abstract]  
Performance Unit Fair Value Assumptions
The following table presents a summary of the fair value of the performance units and the related assumptions as of December 31, 2013.
 
 
 
 
Expected price volatility range
27.0
%
-
44.8
%
Risk-free interest rate
 
 
0.4
%
Fair value per unit (at grant date)
 
 
$
69.38

Fair value per unit (at December 31, 2013)
 
 
$
97.06