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Share and Unit-Based Plans - Nonvested Equity Awards (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
LTIP Units
  
Units (in shares)  
Balance at beginning of period 0
Granted 589,443
Vested (246,471)
Forfeited 0
Balance at end of period 342,972
Value (in dollars per share)  
Balance at beginning of period $ 0.00 [1]
Granted $ 53.18 [1]
Vested $ 60.25 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 48.11 [1]
Stock awards
  
Units (in shares)  
Balance at beginning of period 19,001
Granted 0
Vested (9,812)
Forfeited 0
Balance at end of period 9,189
Value (in dollars per share)  
Balance at beginning of period $ 56.77 [1]
Granted $ 0.00 [1]
Vested $ 54.45 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 59.25 [1]
Phantom stock units
  
Units (in shares)  
Balance at beginning of period 17,575
Granted 7,451
Vested (9,771)
Forfeited 0
Balance at end of period 15,255
Value (in dollars per share)  
Balance at beginning of period $ 58.66 [1]
Granted $ 61.78 [1]
Vested $ 60.91 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 58.74 [1]
Stock units
  
Units (in shares)  
Balance at beginning of period 137,318
Granted 70,389
Vested (68,035)
Forfeited 0
Balance at end of period 139,672
Value (in dollars per share)  
Balance at beginning of period $ 57.24 [1]
Granted $ 60.23 [1]
Vested $ 55.08 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 59.80 [1]
[1] Value represents the weighted average grant date fair value.