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Acquisition of businesses (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Cash Flows Relating to Acquisitions
Cash flows relating to acquisitions
 
         
          2021
$m
         
         2020
$m
         
         2019
$m
  
Cash paid on acquisition, including working capital settlement
       
 
–
 
       
 
–
 
       
 
299
 
Settlement of stamp duty liability
       
 
–
 
       
 
–
 
       
 
3
 
Less: cash and cash equivalents acquired
       
 
–
 
       
 
–
 
       
 
(7
) 
Less: working capital settlement received in year following acquisition
       
 
–
 
       
 
–
 
       
 
(3
) 
Net cash outflow arising on acquisitions
       
 
–
 
       
 
–
 
       
 
292