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Income taxes - Summary of Income (Loss) Before Income Tax Expense (Benefit) by Jurisdiction (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income tax expense (benefit) | $ 138,486 | $ 69,374 | $ 127,324 | $ (183,218) | $ 29,020 | $ (15,312) | $ 52,991 | $ 134,633 | $ 151,966 | $ 201,332 | $ (321,479)
Bermuda |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 113,646 | 197,973 | (273,697)
United States |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 38,159 | 3,245 | (47,771)
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | $ 161 | $ 114 | $ (11)

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