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Preferred Shares - Characteristics Specific to Series of Preferred Shares (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
Series A  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 0.67725
Series A | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 2.03%
Series B  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 0.93575
Series B | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 2.03%
Series C  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 1.00675
Series C | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.10%
Series D  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 0
Series D | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.10%
Series E  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 1.29850
Series E | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.65%
Series F  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 0
Series F | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.65%
Series G  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 1.32500
Series G | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.80%
Series H  
Disclosure of classes of share capital [line items]  
Annual dividend rate per share $ 0
Series H | Benchmark  
Disclosure of classes of share capital [line items]  
Rate spread over Benchmark 3.80%