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Note 22 - Interest-Bearing Loans and Borrowings - Debt Interest Rates (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Balance, current R$ 1,560.6 R$ 1,321.1
Balance, non-current 862.1 1,231.9
Debt denominated in USD [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 32.4 6.4
Balance, non-current 9.9 16.5
Debt denominated in USD [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 538.8 78.3
Balance, non-current 91.2 476.9
Debt denominated in CAD dollars [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 743.9 685.9
Balance, non-current 9.3
Debt denominated in other Latin American currencies [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 11.5 199.1
Balance, non-current 212.1
Debt denominated in other Latin American currencies [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Balance, current
Balance, non-current 5.0
Reais debt [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 121.5 147.7
Balance, non-current 286.1 405.0
Reais debt [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 75.3 165.3
Balance, non-current 162.3 237.0
Reais debt related to ICMS [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Balance, current 37.2 38.4
Balance, non-current R$ 91.2 R$ 91.5
Weighted average [member] | Debt denominated in USD [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 4.40% 3.83%
Weighted average [member] | Debt denominated in USD [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 3.59% 2.74%
Weighted average [member] | Debt denominated in CAD dollars [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 2.43% 2.00%
Weighted average [member] | Debt denominated in other Latin American currencies [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 9.96% 9.27%
Weighted average [member] | Debt denominated in other Latin American currencies [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 2.33%
Weighted average [member] | Reais debt [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 7.05% 6.63%
Weighted average [member] | Reais debt [member] | Floating interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 9.08% 9.22%
Weighted average [member] | Reais debt related to ICMS [member] | Fixed interest rate [member]    
Statement Line Items [Line Items]    
Average rate percentage 5.79% 5.57%