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Share capital and other equity - Non-cumulative preference shares (Details) - $ / shares | Dec. 31, 2021 | Dec. 31, 2020
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Series U, Non-cumulative preference shares of US$0.01 |  |
Share capital |  |
Par value | $ 0.01 |
Number of shares | 10,130 |
Redemption price per share | $ 100,000 |
Non-cumulative preference shares of 0.01 |  |
Share capital |  |
Par value | $ 0.01 |
Number of shares | 10,000 | 10,000

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