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Equity - Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
May 11, 2016
Jul. 06, 2011
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2013
Restricted stock            
Stock-based incentive plan awards            
Compensation expense, net of capitalization     $ 6.6 $ 6.6    
Restricted stock | Employees            
Stock-based incentive plan awards            
Vesting period     3 years      
Awards earned     61,398      
Weighted average fair value of shares granted during the period (in dollars per share)     $ 208.99      
Restricted stock | Non-employee Directors            
Stock-based incentive plan awards            
Vesting period 1 year          
Awards earned 6,437          
Weighted average fair value of shares granted during the period (in dollars per share) $ 203.24          
LTIP Retention Award to Chairman and CEO            
Stock-based incentive plan awards            
Grant Date Fair Value   $ 120.3        
Awards earned   1,000,000        
Service period   8 years        
LTIP Retention Award to Chairman and CEO | A Units            
Stock-based incentive plan awards            
Awards earned         360,000  
LTIP Retention Award to Chairman and CEO | A Units | Maximum            
Stock-based incentive plan awards            
Awards that may be earned           360,000
LTIP Retention Award to Chairman and CEO | B Units | Maximum            
Stock-based incentive plan awards            
Awards that may be earned           360,000
LTIP Retention Award to Chairman and CEO | C Units | Maximum            
Stock-based incentive plan awards            
Awards that may be earned           280,000
LTIP program            
Stock-based incentive plan awards            
Vesting period     2 years      
Vesting rights percentage     50.00%      
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period     10.00%      
Compensation expense, net of capitalization     $ 19.5 $ 18.6    
1-year 2010 LTIP Program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     133,673      
Performance period     1 year      
Grant Date Fair Value     $ 7.2      
2-year 2010 LTIP Program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     337,006      
Performance period     2 years      
Grant Date Fair Value     $ 14.8      
3-year 2010 LTIP Program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     489,654      
Performance period     3 years      
Grant Date Fair Value     $ 23.0      
2011-2013 LTIP Program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     469,848      
Grant Date Fair Value     $ 35.0      
2012-2014 LTIP Program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     401,203      
Grant Date Fair Value     $ 35.0      
2013-2015 LTIP program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in shares)     482,779      
Grant Date Fair Value     $ 29.5      
2014-2016 LTIP program | LTIP Units            
Stock-based incentive plan awards            
Grant Date Fair Value     30.0      
2015-2017 LTIP program | LTIP Units            
Stock-based incentive plan awards            
Grant Date Fair Value     29.9      
2016-2018 LTIP program | LTIP Units            
Stock-based incentive plan awards            
Grant Date Fair Value     $ 28.8