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Share Transactions - Issuance of preferred shares (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]      
Proceeds from issuance of preferred shares, net   $ 485,821 $ 0
Series G Preferred Shares      
Class of Stock [Line Items]      
Preferred shares issued $ 500,000    
Preferred shares, dividend rate (as a percent)   4.55%  
Preferred shares, par value per share   $ 0.01  
Liquidation preference per share   25,000  
Preferred shares, redemption price per share   $ 25,000  
Proceeds from issuance of preferred shares, net $ 485,800    
Series G Depositary Share Equivalent      
Class of Stock [Line Items]      
Preference shares, number of shares issued 20.0    
Proportionate interest of preference shares, per depositary share   0.10%  
Liquidation preference per share   $ 25  
Preferred shares, redemption price per share   $ 25  
Depositary Series E Preferred Stock      
Class of Stock [Line Items]      
Preferred shares, dividend rate (as a percent)   5.25%  
Preferred shares, redemption price per share   $ 25