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Related party disclosures (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure [Abstract]  
Summary of Total Compensation of Key Management Personnel
Key management personnel
Total compensation      
    2024
$m
             2023
$m		              2022
$m		  
Short-term employment benefits    
20.1
      18.6         18.7  
Contributions to defined contribution pension plans    
0.4
      0.5         0.5  
Equity compensation benefits
a
   
16.4
      15.8         13.4  
     
36.9
      34.9         32.6  
 
a.
As measured in accordance with IFRS 2 ‘Share-based Payment’.
Summary of Related Party Disclosures for Associates and Joint Ventures
Associates and joint ventures
        
    2024
$m
             2023
$m		              2022
$m		  
Fee revenue    
12
      11         9  
Amounts receivable (net)    
41
      19         10  
Amounts payable    
–
      (10 )        –