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Related party disclosures (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Total Compensation of Key Management Personnel
        
         2021  
$m  
         
        2020
$m
         
        2019  
$m  
Total compensation of key management personnel
      
 
           
 
 
 
       
 
Short-term employment benefits
      
19.3  
           
 
10.5
 
       
15.8  
Contributions to defined contribution pension plans
      
0.5  
           
 
0.3
 
       
0.5  
Equity compensation benefits
a
     
8.1  
           
 
2.3
 
       
12.1  
 
      
27.9  
           
 
13.1
 
       
28.4  
 
a
 
As measured in accordance with IFRS 2 ‘Share-based Payment’.
Summary of Related Party Disclosures for Associates and Joint Ventures
 
        
         2021  
$m  
         
        2020
$m
        
        2019 
$m 
Associates
      
 
           
 
 
 
      
 
Fee revenue from associates
      
3  
           
 
1
 
      
10 
Amounts owed by associates
      
11  
           
 
11
 
      
3 
Amounts owed to associates
      
–  
           
 
(4
) 
      
(4)