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Share and Unit-Based Plans - Long-Term Incentive Plan Units (Details)
12 Months Ended
Mar. 04, 2016
$ / shares
shares
Jan. 07, 2016
Jan. 01, 2016
$ / shares
shares
Dec. 31, 2015
shares
Mar. 06, 2015
$ / shares
shares
Jan. 12, 2015
Jan. 01, 2015
$ / shares
shares
Dec. 31, 2014
shares
Mar. 07, 2014
$ / shares
shares
Jan. 01, 2014
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Stock units                          
Share and unit-based plans                          
Conversion rate                     1    
Granted (shares)                     85,601 77,282 75,309
Granted (in dollars per share) | $ / shares                     $ 79.22 $ 86.53 $ 60.50
Vested (shares)                     69,259 86,761 68,253
LTIP units                          
Share and unit-based plans                          
Conversion rate                     1    
Granted (shares)                     480,371 424,442 725,908
Granted (in dollars per share) | $ / shares                 $ 60.25   $ 65.00 $ 74.71 $ 51.71
Level of percentile ranking at which awards vested (as a percent)   130.00%       150.00%              
Absolute return requirement (shares)                   3.00%      
Vested (shares)       55,934       136,465     214,114 414,822 679,213
Risk free rate (as a percent)     1.32%       0.25%            
Volatility rate (as a percent)     20.31%       16.81%            
LTIP units | LTIP units that vest in equal installments over a service period ending December 31, 2018                          
Share and unit-based plans                          
Granted (shares)     58,786                    
Granted (in dollars per share) | $ / shares     $ 80.69                    
LTIP units | Market-Indexed LTIP units that vest in equal installments over a service period ending December 31, 2018                          
Share and unit-based plans                          
Granted (shares)     266,899                    
Granted (in dollars per share) | $ / shares     $ 53.32                    
LTIP units | LTIP units that are fully vested on the grant date                          
Share and unit-based plans                          
Granted (shares) 154,686                        
Granted (in dollars per share) | $ / shares $ 79.20                        
LTIP units | 2014 LTIP Units Series 2                          
Share and unit-based plans                          
Granted (shares)                   70,042      
Granted (in dollars per share) | $ / shares                   $ 58.89      
LTIP units | 2014 LTIP Units Series 1                          
Share and unit-based plans                          
Granted (shares)                 246,471 272,930      
Granted (in dollars per share) | $ / shares                   $ 45.34      
LTIP units | 2015 LTIP Units Series 1                          
Share and unit-based plans                          
Granted (shares)             49,451            
Granted (in dollars per share) | $ / shares             $ 83.41            
LTIP units | 2015 LTIP Units Series 2                          
Share and unit-based plans                          
Granted (shares)             186,450            
Granted (in dollars per share) | $ / shares             $ 66.37            
LTIP units | 2015 LTIP Units Series 3                          
Share and unit-based plans                          
Granted (shares)         132,607                
Granted (in dollars per share) | $ / shares         $ 86.72