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Employee benefits - Composition (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Presented as non-current liabilities:    
Present value of obligations (see section (f) below) $ 52.9 $ 70.7
Fair value of the plan assets (see section (f) below) (26.8) (31.1)
Recognized liability for defined benefit obligations 26.1 39.6
Termination benefit-liability for early retirement 6.6 10.2
Other long-term benefits 12.5 15.8
Non-current 45.2 65.6
Presented as current liabilities:    
Liability for annual leave 9.0 9.0
Current portion of liability for early retirement 2.8 4.3
Current (Note 14) 11.8 13.3
Total employee benefits 57.0 78.9
Presented in the statement of financial position as follows:    
Total employee benefits $ 57.0 $ 78.9