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Contracted concessional assets (Tables)
6 Months Ended
Jun. 30, 2020
Contracted concessional assets [Abstract]  
Movements of contracted concessional assets
The detail of contracted concessional assets included in the heading ‘Contracted concessional assets’ as of June 30, 2020 and December 31, 2019 is as follows:

  
Balance as of
June 30,
2020
  
Balance as of
December 31,
2019
 
  
($ in thousands)
 
Contracted concessional assets cost
  
10,435,825
   
10,384,597
 
Amortization and impairment
  
(2,400,935
)
  
(2,223,468
)
Total
  
8,034,890
   
8,161,129