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Preferred Shares - Characteristics Specific to Series of Preferred Shares (Details) | 12 Months Ended
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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%

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