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Trade and other receivables (Details 3)
12 Months Ended
Dec. 31, 2018
Current balance  
%  Impairment loss estimate by stretch 0.10%
0 a 3 months  
%  Impairment loss estimate by stretch 4.30%
3 a 6 months  
%  Impairment loss estimate by stretch 32.60%
6 a 12 months  
%  Impairment loss estimate by stretch 100.00%
More than 12 months  
%  Impairment loss estimate by stretch 100.00%