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31. Risks and Financial Instruments (Details 1)
R$ in Millions
Dec. 31, 2017
BRL (R$)
Scenario I  
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]  
Income statement effect R$ (2.6)
Shareholders' equity effect (140.4)
Total (143.0)
Income statement effect 2.6
Shareholders' equity effect 140.4
Total 143.0
Scenario II  
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]  
Income statement effect (6.5)
Shareholders' equity effect (351.1)
Total (357.6)
Income statement effect 6.5
Shareholders' equity effect 351.1
Total 357.6
Scenario III  
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]  
Income statement effect (13.0)
Shareholders' equity effect (702.2)
Total (715.2)
Income statement effect 13.0
Shareholders' equity effect 702.2
Total R$ 715.2