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Shareholders' Equity / Partners' Capital - Redemption of Series A and B Participating Preferred Shares (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 03, 2017
market
shares
Dec. 31, 2013
Mar. 31, 2014
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
Class of Stock [Line Items]            
Preferred shares, shares outstanding (in shares)       38,350,000 37,010,000  
Preferred shares, par value (in dollars per share) | $ / shares       $ 0.01 $ 0.01  
Conversion ratio 1.13106          
Series B Participating Preferred Stock            
Class of Stock [Line Items]            
Preferred shares, shares outstanding (in shares) 4,400,000          
Cumulative annual cash dividend rate 5.00%   5.00% 5.00% 5.00% 5.00%
Series A Participating Preferred Stock            
Class of Stock [Line Items]            
Preferred shares, shares outstanding (in shares) 5,060,000          
Cumulative annual cash dividend rate 5.00% 5.00%   5.00% 5.00% 5.00%
Preferred shares, par value (in dollars per share) | $ / shares       $ 0.01    
Conversions (in shares) 12,398,276          
Class A common shares/units            
Class of Stock [Line Items]            
Percent of cumulative change in value of an index 50.00%          
Number of markets used in calculation | market 20          
Preferred stock redemption premium | $       $ 42.4