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Restructuring and impairment costs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Restructuring Cost and Reserve [Line Items]          
Impairment of long-lived assets $ 306.7   $ 0.0 $ 306.7 $ 0.0
January 2023 Restructuring Plan          
Restructuring Cost and Reserve [Line Items]          
Number of positions eliminated, percent       5.00%  
Restructuring charges $ (0.1) $ 9.7   $ 9.6