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Income taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income taxes 16. Income taxesThe effective income tax rate for the three and six months ended June 30, 2021 was 27.8% and 26.7% respectively, compared with 24.1% and 23.9% respectively, for the three and six months ended June 30, 2020. The increase in the effective tax rate for both the three and six months ended June 30, 2021 compared to the three and six months ended June 30, 2020 was