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Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]        
Proceeds from issuance of class A common shares   $ 414,100,000 $ 0 $ 0
Class A Common Shares/units        
Class of Stock [Line Items]        
Common stock, shares issued (in shares) 14,950,000      
Proceeds from issuance of class A common shares $ 411,700,000      
Stock issuance costs 200,000 600,000 $ 0 $ 0
At the Market - Common Share Offering Program | Class A Common Shares/units        
Class of Stock [Line Items]        
Capital shares amount authorized for future issuance 500,000,000.0 $ 500,000,000.0    
Common stock, shares issued (in shares)   86,130,000,000    
Proceeds from issuance of class A common shares   $ 2,400,000    
Stock issuance costs   400,000    
Shares reserved for future issuance $ 497,600,000 $ 497,600,000