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Common shares - Dividend payments (Details) - $ / shares
12 Months Ended
Dec. 15, 2023
Sep. 15, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 15, 2022
Jun. 15, 2022
Mar. 15, 2022
Dec. 15, 2021
Sep. 29, 2021
Jun. 15, 2021
Mar. 15, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangements [Abstract]                            
Dividends paid per share (in USD per share) $ 0.35 $ 0.25 $ 0.25 $ 0.20 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 1.05 $ 0.40 $ 0.40