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Capital and other commitments (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Capital and Other Commitments
   
2019
   2018 
   
$m
   $m 
Contracts placed for expenditure not provided for in the Group Financial Statements:
          
Property, plant and equipment
a
  
 
52
 
   46 
   
 
 
   
 
 
 
Intangible assets
  
 
7
 
   7 
   
 
 
   
 
 
 
Key money
  
 
135
 
   83 
   
 
 
   
 
 
 
   
 
194
 
   136 
   
 
 
   
 
 
 
 
a
 
2018 included a commitment to spend
$33
m on the acquired UK portfolio (see note 11) within two and a half years of the acquisition date.