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Employee benefits - Movement in the present value of the defined benefit pension plan obligation and present value of plan assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance $ 70.7 $ 70.4
Benefits paid by the plan (4.4) (4.9)
Current service cost and interest 5.3 4.2
Foreign currency exchange changes in plan measured in a currency different from the entity's functional currency (7.0) 1.1
Actuarial gains (loss) recognized in other comprehensive income (11.7) (0.1)
Ending balance 52.9 70.7
Present value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 31.1 30.7
Contribution paid by the Group 2.1 0.3
Benefits paid by the plan (2.0) (2.5)
Return on plan assets 0.8 0.7
Foreign currency exchange changes in plan measured in a currency different from the entity's functional currency (2.5) 0.6
Actuarial gains (loss) recognized in other comprehensive income (2.7) 1.3
Ending balance $ 26.8 $ 31.1