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Related party disclosures (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Total Compensation of Key Management Personnel
   
2020
$m
   2019
$m		   2018
$m		 
Total compensation of key management personnel
      
Short-term employment benefits
  
 
10.5
 
   15.8    18.2 
  
 
 
   
 
 
   
 
 
 
Contributions to defined contribution pension plans
  
 
0.3
 
   0.5    0.5 
  
 
 
   
 
 
   
 
 
 
Equity compensation benefits
a
  
 
2.3
 
   12.1    13.0 
  
 
 
   
 
 
   
 
 
 
  
 
13.1
 
   28.4    31.7 
  
 
 
   
 
 
   
 
 
 
 
a
As measured in accordance with IFRS 2.
Summary of Related Party Disclosures for Associates and Joint Ventures
Related party disclosures for associates and joint ventures are as follows:
 
   
Associates
  
Joint ventures
   
Total
 
   
2020
$m
  2019
$m		  2018
$m		  
2020
$m
   2019
$m		   2018
$m		   
2020
$m
  2019
$m		  2018
$m		 
Revenue from associates and joint ventures
  
 
1
 
  10   9  
 
—  
 
   —      1   
 
1
 
  10   10 
  
 
 
  
 
 
  
 
 
  
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
 
Other amounts owed by associates and joint ventures
  
 
11
 
  3   1  
 
—  
 
   —      —     
 
11
 
  3   1 
  
 
 
  
 
 
  
 
 
  
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
 
Amounts owed to associates and joint ventures
  
 
(4
) 
  (4)   (2)  
 
—  
 
   —      —     
 
(4
) 
  (4)   (2)