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Preferred Shares - Series A Cumulative Fixed Redeemable Rate Reset Preferred Shares Conversion (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 17, 2016
Disclosure of classes of share capital [line items]        
Number of shares issued upon conversion       1,824,620
Series A        
Disclosure of classes of share capital [line items]        
Number of shares converted into other classes of shares       1,824,620
Number of shares issued upon conversion 10,200,000 10,200,000    
Number of shares outstanding 10,200,000 10,200,000   12,000,000.0
Payment period for cumulative preferential cash dividends 5 years      
Annualized fixed dividend rate 2.709%      
Series F        
Disclosure of classes of share capital [line items]        
Shares Required To Cause Conversion of Securities, Trigger 1,000,000      
Series B        
Disclosure of classes of share capital [line items]        
Number of shares issued upon conversion 1,800,000 1,800,000    
Number of shares outstanding 1,800,000 1,800,000    
Payment period for cumulative preferential cash dividends 5 years      
Annualized fixed dividend rate 2.03%      
Series E        
Disclosure of classes of share capital [line items]        
Number of shares converted into other classes of shares     0  
Number of shares issued upon conversion 9,000,000.0 9,000,000.0    
Number of shares outstanding 9,000,000.0 9,000,000.0    
Annualized fixed dividend rate 5.194%      
Series D        
Disclosure of classes of share capital [line items]        
Shares Required To Cause Conversion of Securities, Trigger 1,000,000      
Series C        
Disclosure of classes of share capital [line items]        
Number of shares converted into other classes of shares     0  
Number of shares issued upon conversion 11,000,000.0 11,000,000.0    
Number of shares outstanding 11,000,000.0 11,000,000.0    
Annualized fixed dividend rate 4.027%      
Series G        
Disclosure of classes of share capital [line items]        
Number of shares issued upon conversion 6,600,000 6,600,000    
Shares Required To Cause Conversion of Securities, Trigger 1,000,000      
Number of shares outstanding 6,600,000 6,600,000    
Annualized fixed dividend rate 4.988%