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Shareholders' Equity / Partners' Capital - Share Repurchase Program (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Class A Common Shares/units        
Class of Stock [Line Items]        
Repurchase of class A common stock, authorized amount       $ 300,000,000.0
Weighted-average price of shares (in dollars per share)     $ 19.36  
Total cost of class A common shares     $ 34,900,000  
Remaining repurchase authorization amount $ 265,100,000      
Class A Common Shares/units | Common Stock        
Class of Stock [Line Items]        
Repurchases and retire of class A common shares (in shares) 0 0 1,800,000  
Preferred shares        
Class of Stock [Line Items]        
Repurchase of class A common stock, authorized amount       $ 250,000,000.0
Remaining repurchase authorization amount $ 250,000,000.0