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31. Risks and Financial Instruments (Details 6)
R$ in Millions, $ in Millions
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2016
USD ($)
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Fair value R$ (77.9)   R$ 16.2  
Amounts receivable 2,415.9      
Amounts payable 2,493.8      
Exchange rate swaps receivable in U.S. dollars        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   $ 0.0   $ 0.0
Fair value (70.0)   52.7  
Amounts receivable 1,807.4      
Amounts payable 1,877.4      
Exchange rate swaps receivable in U.S. dollars | Receivables in U.S. dollars (LIBOR)        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   300.0   350.0
Fair value 984.3   1,149.7  
Amounts receivable 984.3      
Amounts payable 0.0      
Exchange rate swaps receivable in U.S. dollars | Receivables in U.S. dollars (Fixed)        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   956.6   1,062.4
Fair value 823.1   1,084.6  
Amounts receivable 823.1      
Amounts payable 0.0      
Exchange rate swaps receivable in U.S. dollars | Payables in CDI interest rate        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   (1,256.6)   (1,412.4)
Fair value (1,877.4)   (2,181.6)  
Amounts receivable 0.0      
Amounts payable 1,877.4      
Exchange rate swaps payable in U.S. dollars + COUPON        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   0.0   0.0
Fair value 0.1   0.4  
Amounts receivable 29.9      
Amounts payable 29.8      
Exchange rate swaps payable in U.S. dollars + COUPON | Receivables in CDI interest rates        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   9.1   8.5
Fair value 29.9   28.3  
Amounts receivable 29.9      
Amounts payable 0.0      
Exchange rate swaps payable in U.S. dollars + COUPON | Payables in U.S. dollars (Fixed)        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount | $   $ (9.1)   $ (8.5)
Fair value (29.8)   (27.9)  
Amounts receivable 0.0      
Amounts payable 29.8      
Interest rate swaps in Brazilian Reais | Receivables in fixed interest rates + IPCA        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount 566.1   0.0  
Fair value 583.3   0.0  
Amounts receivable 583.3      
Amounts payable 0.0      
Payables in CDI interest rate        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount 0.0   0.0  
Fair value (3.3)   0.0  
Amounts receivable 583.3      
Amounts payable 586.6      
Payables in CDI interest rate | Payables in CDI        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Notional amount (566.1)   0.0  
Fair value (586.6)   0.0  
Amounts receivable 0.0      
Amounts payable 586.6      
Gross result        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Fair value (73.2)   53.1  
Amounts receivable 2,420.6      
Amounts payable 2,493.8      
Income tax        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Fair value (4.7)   (36.9)  
Amounts receivable (4.7)      
Amounts payable 0.0      
Positive result        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Fair value 85.8   218.5  
Negative result        
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]        
Fair value R$ (163.7)   R$ (202.3)