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Income taxes - Narratives (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |
Uncertain tax positions | $ 1.5 | $ 1.5
Operating loss carryforwards | $ 45.1 |
United States |  |
Operating Loss Carryforwards [Line Items] |  |
Effective tax rate | 21.00% |

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