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Note 22 - Interest-Bearing Loans and Borrowings - Liabilities (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent R$ 1,231.9 R$ 1,765.7
Interest-bearing loans and borrowings, current 1,321.1 3,630.6
Secured bank loans [member]    
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent 589.3 665.8
Interest-bearing loans and borrowings, current 879.6 1,381.4
Unsecured bank loans [member]    
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent 413.7 609.9
Interest-bearing loans and borrowings, current 394.3 1,910.1
Debentures and unsecured bond issues [member]    
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent 102.7 100.8
Interest-bearing loans and borrowings, current 296.4
Other unsecured loans [member]    
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent 101.5 356.2
Interest-bearing loans and borrowings, current 38.4 33.5
Financial leasing [member]    
Statement Line Items [Line Items]    
Interest-bearing loans and borrowings, noncurrent 24.7 33.0
Interest-bearing loans and borrowings, current R$ 8.8 R$ 9.2