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Share capital - Share repurchases (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2018 | May 04, 2016
Share repurchase [Abstract] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 200,000,000.0 | $ 100,000,000.0
Stock Repurchase Program, Increase in Authorized Amount |  |  |  | $ 148,300,000 |
Payments for Repurchase of Common Stock | $ 0 | $ 0 | $ 138,705,000 |  |
Stock Repurchased and Retired During Period, Shares |  |  | 10,311,123 |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 13.45 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 61,300,000 |  |  |  |

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