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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) 0.00% 0.40% (0.30%) (0.30%)
Discrete income tax expense $ 0.9   $ 1.5  
Annual effective tax rate 0.014 (0.005)