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Preferred Shares - Preferred Share Series Information (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 17, 2017 | Jun. 16, 2017
Series E |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Convertible preferred shares tendered for conversion |  |  | 133,969 |
Annualized fixed dividend rate | 5.194% |  |  |
Bond yield | 1.544% |  |  |
Dividend rate on preference shares, term | 3.65% |  |  |
Preferred Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Fixed rate reset term |  | 5 years |  |
Amount per share redeemable at reset date |  | $ 25.00 |  |
Series C |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Convertible preferred shares tendered for conversion |  |  |  | 827,628
Annualized fixed dividend rate | 4.027% |  |  |
Bond yield | 0.927% |  |  |
Dividend rate on preference shares, term | 3.10% |  |  |

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