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Finance costs (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Financial Income and Expenses
   
2019

$m
   2018
Restated
$m		   2017
Restated
$m		 
Financial income
               
   
 
 
   
 
 
   
 
 
 
Financial income on deposits and money market funds
  
 
3
 
   2    1 
   
 
 
   
 
 
   
 
 
 
Interest income on loans and other assets
  
 
3
 
   3    3 
   
 
 
   
 
 
   
 
 
 
   
 
6
 
   5    4 
   
 
 
   
 
 
   
 
 
 
Financial expenses
               
   
 
 
   
 
 
   
 
 
 
Interest expense on bonds and syndicated facility
  
 
78
 
   
61
    
58
 
   
 
 
   
 
 
   
 
 
 
Interest expense on lease liabilities
  
 
41
 
   39    39 
   
 
 
   
 
 
   
 
 
 
Capitalised interest
  
 
(5
)
 
   (5)    (6) 
Unwind of discount on deferred purchase consideration
a
  
 
1
 
   
1
    —   
   
 
 
   
 
 
   
 
 
 
Other charges
b
  
 
6
 
   5    4 
   
 
 
   
 
 
   
 
 
 
   
 
121
 
   101    95 
   
 
 
   
 
 
   
 
 
 
 
a
Fair value gains/(losses) on contingent purchase consideration have been disclosed on the face of the Group income statement. The 2018 comparatives have been restated accordingly.
b
Other charges comprise bank charges and non-bank interest expense.