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Preferred Shares - Series A Cumulative Fixed Redeemable Rate Reset Preferred Shares Conversion (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 17, 2016
Disclosure of classes of share capital [line items]        
Number of shares issued upon conversion 38,600,000 38,600,000   1,824,620.00
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
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 9,000,000    
Number of shares outstanding 9,000,000 9,000,000    
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 11,000,000    
Number of shares outstanding 11,000,000 11,000,000    
Annualized fixed dividend rate 4.027%