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Income taxes - Rate reconciliation (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 21, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]              
Computed "expected" tax benefit 35.00%         21.00% 21.00%
State income tax benefit           2.80% 3.40%
Permanent differences           (0.50%) (0.30%)
Foreign rate differential           0.20% (0.10%)
Remeasurement gain (loss)           0.50% 0.00%
Tax credits           2.20% 2.30%
Valuation allowance           (1.10%) (0.50%)
Transaction costs           (0.40%) (0.10%)
Deferred rate change           (0.30%) (0.20%)
GILTI inclusion           (0.0050) (0.0130)
Other           (0.20%) 0.90%
Effective Income Tax Rate Reconciliation, Percent, Total   26.70% 23.10% 27.00% 23.60% 23.70% 25.10%