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Auditor's remuneration (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Auditor's Remuneration Paid
          
      2021
$m
          
      2020
$m
         
      2019
$m
  
Audit of the Financial Statements
        
 
3.7
 
        
 
3.0
 
       
 
3.0
 
Audit of subsidiaries
        
 
3.4
 
        
 
3.3
 
       
 
3.2
 
Audit-related assurance services
        
 
0.2
 
        
 
0.2
 
       
 
0.2
 
Other assurance services
a
       
 
0.7
 
        
 
1.1
 
       
 
1.3
 
Other
non-audit
services not covered by the above
        
 
–
 
        
 
0.1
 
       
 
0.1
 
 
        
 
8.0
 
        
 
7.7
 
       
 
7.8
 
 
a
 
In 2020, excluded fees of $0.2m which had not been incurred as at 31 December 2020.