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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) (0.30%) 5.00% (0.30%) 2.90%
Discrete income tax expense $ 0.5   $ 2.0  
Annual effective tax rate 0.014 0.028