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Share and Unit-Based Plans - SARs Narrative (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 06, 2016
Jan. 05, 2016
Dec. 08, 2015
Dec. 07, 2015
Dec. 31, 2013
Share and unit-based plans                
Distributions paid, per share (in dollars per share)   $ 4.63 $ 2.51          
SARs                
Share and unit-based plans                
Term of award (in years) 10 years              
Grant date of award (in dollars per share) $ 9.67              
Volatility rate (as a percent) 25.85%              
Dividend yield (as a percent) 3.69%              
Risk free rate (as a percent) 1.20%              
Current value (in dollars per share) $ 59.57              
Expected term (in years) 8 years              
Stock appreciation units balance (shares) 284,146 417,783 772,639 427,968   417,783 407,823 1,070,991
Stock appreciation weighted average price (in dollars per share) $ 53.85 $ 55.13 $ 56.67 $ 53.85 $ 55.13 $ 55.13 $ 56.49 $ 56.66
SARS granted prior to 2012                
Share and unit-based plans                
Grant date of award (in dollars per share) $ 7.68              
Volatility rate (as a percent) 22.52%              
Dividend yield (as a percent) 5.23%              
Risk free rate (as a percent) 3.15%              
Current value (in dollars per share) $ 61.17              
Expected term (in years) 8 years