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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) 0.40% 9.60% (0.30%) 23.20%
Discrete income tax expense (benefit) $ (0.1)   $ (0.1)  
Annual effective tax rate (0.005) 0.212