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Auditor's remuneration paid to Ernst & Young LLP (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Auditor's Remuneration Paid
   
2020
$m
   2019
$m		   2018
$m		 
Audit of the Financial Statements
a
  
 
3.0
 
   3.0    3.3 
  
 
 
   
 
 
   
 
 
 
Audit of subsidiaries
  
 
3.3
 
   3.2    2.9 
  
 
 
   
 
 
   
 
 
 
Audit-related assurance services
  
 
0.2
 
   0.2    0.2 
  
 
 
   
 
 
   
 
 
 
Other assurance services
b
  
 
1.1
 
   1.3    1.3 
  
 
 
   
 
 
   
 
 
 
Other
non-audit
services not covered by the above
  
 
0.1
 
   0.1    0.1 
  
 
 
   
 
 
   
 
 
 
   
7.7
   
7.8
   
7.8
 
  
 
 
   
 
 
   
 
 
 
 
a
 
In 2018, included $0.4m of additional fees for specific procedures performed in relation to the implementation of new accounting standards.
b
 
Excludes fees of $0.2m which have not yet been incurred.