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17 Borrowings and financing (Details 5)
 12 Months Ended
Dec. 31, 2020
Adjusted EBITDA / adjusted financial expenses [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Equal to or higher than 2.80
Adjusted net debt / adjusted EBITDA [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Equal to or lower than 3.80
Adjusted total debt / adjusted EBITDA [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Lower than 3.65
Other onerous debt / adjusted EBITDA [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Equal to or lower than 1.30 [1]
Adjusted current ratio [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Higher than 1.00
EBITDA / paid financial expenses [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Equal to or higher than 2.35
Net debt / adjusted EBITDA [member]  
Disclosure of detailed information about borrowings [line items]  
Restrictive ratios Equal to or lower than 3.50
[1] "Other Onerous Debts" correspond to the sum of pension obligations and health care plan, installment payment of tax debts and installment payment of debts with the electricity supplier.