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Employee benefits (Tables)
 12 Months Ended
Dec. 31, 2022
Employee benefits  
Schedule of composition of employee benefits
    2022     2021  
   

US $ in millions

  
             
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
  
Schedule of movement in the present value of the defined benefit pension plan obligation and present value of plan assets and composition
  (f) Movement in the present value of the defined benefit pension plan obligation
   
2022
    
2021
  
   
US $ in millions
  
             
Defined benefit obligation at January 1
    
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 recognized in other comprehensive income
    
(11.7
)
    
(0.1
)
Defined benefit obligation at December 31
    
52.9
      
70.7
  
   
2022
    
2021
  
   
US $ in millions
  
             
Fair value of plan assets at January 1
    
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
  
Fair value of plan assets at December 31
    
26.8
      
31.1
  
  Plan assets composition

​

  
   
2022
    
2021
  
   
US $ in millions
  
             
Equity instruments
    
8.5
      
9.4
  
Debt instruments
    
12.8
      
15.0
  
Cash and deposits
    
2.4
      
2.0
  
Other
    
3.1
      
4.7
  
     
26.8
      
31.1
  
Schedule of relevant discount rates under actuarial assumptions

​

  

2022

    

2021

    

2020

  

Early retirement

    

4.7%-4.8

 %    

1.0%-1.2

%

    

0.9%-1.0

%

Annual absence

    

5.1%-5.2

%

    

2.6%-2.9

%

    

2.4%-2.5

%

Tuition fees

    

4.8%-5.0

%

    

1.6%-2.2

%

    

1.3%-1.9

%

Defined benefit plan

    

3.8%-5.3

%

    

0.7%-3.3

%

    

1.0%-2.7

%
Schedule of sensitivity analysis of actuarial assumptions
  Reasonably possible changes to one of the relevant actuarial assumptions, assuming other assumptions constant, would have affected the defined benefit obligation by the amounts below:

​

  

Defined benefit obligation

  

​

  

At December 31, 2022

  

​

  

Increase

    

Decrease

  

​

  

US $ in millions

  
       

Discount rate (0.5% movement)

    

(1.4

)

  

1.3

  

Future benefit growth (0.5% movement)

    

2.2

      

(2.2

)