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Share and Unit-Based Plans - Nonvested Equity Awards (Details)
 6 Months Ended
Jun. 30, 2017
$ / shares
shares
LTIP Units  
Units  
Balance at beginning of period (in shares) | shares 322,572
Granted (in shares) | shares 506,906
Vested (in shares) | shares (134,742)
Balance at end of period (in shares) | shares 694,736
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 58.18
Granted (in dollars per share) | $ / shares 55.33
Vested (in dollars per share) | $ / shares 66.57
Balance at end of period (in dollars per share) | $ / shares $ 54.48
Phantom Stock Units  
Units  
Balance at beginning of period (in shares) | shares 5,845
Granted (in shares) | shares 6,772
Vested (in shares) | shares (5,268)
Balance at end of period (in shares) | shares 7,349
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 81.47
Granted (in dollars per share) | $ / shares 71.73
Vested (in dollars per share) | $ / shares 76.29
Balance at end of period (in dollars per share) | $ / shares $ 76.20
Stock Units  
Units  
Balance at beginning of period (in shares) | shares 148,428
Granted (in shares) | shares 85,979
Vested (in shares) | shares (78,573)
Balance at end of period (in shares) | shares 155,834
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 78.53
Granted (in dollars per share) | $ / shares 66.53
Vested (in dollars per share) | $ / shares 75.79
Balance at end of period (in dollars per share) | $ / shares $ 73.28