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Incentive, Retirement and Deferred Compensation Plans - Performance Unit Fair Value Assumptions (Details) (Performance Units, USD $)
12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Performance Units
   
Employee Compensation Plans [Line Items]    
Expected price volatility range, minimum 27.00%  
Expected price volatility range, maximum 44.80%  
Risk-free interest rate 0.40%  
Fair value per unit (at grant date)   $ 69.38
Fair value per unit (at December 31, 2013) $ 97.06