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Preferred Shares - Series Cumulative Redeemable Rate Reset Preferred Shares Conversion (Details) - $ / shares
 12 Months Ended
Mar. 01, 2021
Dec. 23, 2020
Nov. 03, 2020
Sep. 17, 2017
Jun. 16, 2017
Dec. 31, 2020
Dec. 31, 2019
Aug. 30, 2019
Mar. 17, 2016
Disclosure of classes of share capital [line items]                  
Remaining balance threshold for conversion to other series (in shares) 1,000,000                
Dividends declared per share   $ 0.0450 $ 0.0425            
Series G                  
Disclosure of classes of share capital [line items]                  
Convertible Preferred Shares , Threshold For Required Shares Conversion       1,000,000,000,000          
Convertible preferred shares tendered for conversion               140,730  
Annualized fixed dividend rate           4.988%      
Bond yield           1.188%      
Dividend rate on preference shares, spread           3.80%      
Number of shares outstanding           6,600,000 6,600,000    
Dividends declared per share   0.31175              
Series E                  
Disclosure of classes of share capital [line items]                  
Convertible Preferred Shares , Threshold For Required Shares Conversion       1,000,000,000,000          
Convertible preferred shares tendered for conversion       133,969          
Annualized fixed dividend rate           5.194%      
Bond yield           1.544%      
Bond yield, period           5 years      
Dividend rate on preference shares, spread           3.65%      
Number of shares outstanding           9,000,000.0 9,000,000.0    
Dividends declared per share   0.32463              
Series C                  
Disclosure of classes of share capital [line items]                  
Convertible Preferred Shares , Threshold For Required Shares Conversion         1,000,000,000,000        
Convertible preferred shares tendered for conversion         827,628        
Annualized fixed dividend rate           4.027%      
Bond yield           0.927%      
Bond yield, period           5 years      
Dividend rate on preference shares, spread           3.10%      
Number of shares outstanding           11,000,000.0 11,000,000.0    
Dividends declared per share   0.25169              
Series A                  
Disclosure of classes of share capital [line items]                  
Annualized fixed dividend rate           2.709%      
Bond yield 0.847%                
Bond yield, period 5 years                
Dividend rate on preference shares, spread 2.03%                
Number of shares converted into other classes of shares                 1,824,620
Number of shares outstanding           10,200,000 10,200,000   12,000,000.0
Payment period for cumulative preferential cash dividends           5 years      
Dividends declared per share   0.16931              
Series A | Later than four years and not later than five years                  
Disclosure of classes of share capital [line items]                  
Annualized fixed dividend rate 2.877%                
Series B                  
Disclosure of classes of share capital [line items]                  
Annualized fixed dividend rate           2.03%      
Bond yield 0.073%                
Dividend rate on preference shares, spread 2.03%         2.03%      
Number of shares outstanding           1,800,000 1,800,000    
Payment period for cumulative preferential cash dividends           5 years      
Dividends declared per share   $ 0.13186              
Series B | Later than four years and not later than five years                  
Disclosure of classes of share capital [line items]                  
Annualized fixed dividend rate 2.103%