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Share and Unit-Based Plans - SARs (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Stock Options (in shares)  
Forfeited 0
Value (in dollars per share)  
Forfeited $ 0.00 [1]
SARs
  
SARs (in shares)  
Balance at beginning of period 1,070,991
Granted 0
Exercised (in shares) 0
Forfeited 0
Balance at end of period 1,070,991
Value (in dollars per share)  
Balance at beginning of period $ 56.66
Granted $ 0.00
Exercised $ 0.00
Forfeited $ 0.00 [1]
Balance at beginning of period $ 56.66
Stock options
  
Stock Options (in shares)  
Balance at beginning of period 10,068
Granted 0
Exercised 0
Balance at end of period 10,068
Value (in dollars per share)  
Balance at beginning of period $ 59.57
Granted $ 0.00
Exercised $ 0.00
Balance at end of period $ 59.57
[1] Value represents the weighted average grant date fair value.