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Auditor's remuneration paid to Ernst & Young LLP (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Auditor's Remuneration Paid
   
2019

$m
   2018
$m		   2017
$m		 
Audit of the Financial Statements
a
  
 
3.0
 
   3.3    3.0 
   
 
 
   
 
 
   
 
 
 
Audit of subsidiaries
  
 
3.2
 
   2.9    2.2 
   
 
 
   
 
 
   
 
 
 
Audit-related assurance services
  
 
0.2
 
   0.2    0.2 
   
 
 
   
 
 
   
 
 
 
Other assurance services
  
 
1.3
 
   1.3    1.0 
   
 
 
   
 
 
   
 
 
 
Tax compliance
  
 
—
 
   —      0.1 
   
 
 
   
 
 
   
 
 
 
Other
non-audit
services not covered by the above
  
 
0.1
 
   0.1    0.2 
   
 
 
   
 
 
   
 
 
 
   
 
7.8
 
         7.8          6.7 
   
 
 
   
 
 
   
 
 
 
 
a
Includes $nil (2018: $0.4m, 2017: $0.5m) of additional fees for specific procedures performed in relation to the implementation of new accounting standards.