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Risks and Financial Instruments - Position of hedging instruments (Detail)
R$ in Millions, $ in Millions
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Summary of risks and financial instruments [line items]        
Fair value R$ 319.4   R$ (77.9)  
Amounts receivable 3,382.3      
Amounts payable 3,062.9      
Exchange Rate Swap Receivable In U S Dollars [member] | Payables in CDI interest rate [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   $ (1,311.8)    
Gross result [member]        
Summary of risks and financial instruments [line items]        
Fair value 347.3   (73.2)  
Amounts receivable 3,410.2      
Amounts payable 3,062.9      
Income tax [member]        
Summary of risks and financial instruments [line items]        
Fair value (27.9)   (4.7)  
Amounts receivable (27.9)      
Positive result [member]        
Summary of risks and financial instruments [line items]        
Fair value 363.3   85.8  
Amounts receivable 2,296.3      
Amounts payable 1,932.9      
Negative result [member]        
Summary of risks and financial instruments [line items]        
Fair value (43.9)   (163.7)  
Amounts receivable 1,086.0      
Amounts payable 1,130.0      
Designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member]        
Summary of risks and financial instruments [line items]        
Fair value 35.4   (114.4)  
Amounts receivable 1,551.2      
Amounts payable 1,515.8      
Designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Receivables In U S Dollars LIBOR [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   150.0   $ 240.0
Fair value 577.5   788.6  
Amounts receivable 577.5      
Designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Receivables in US dollars fixed [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   245.0   203.6
Fair value 973.7   665.6  
Amounts receivable 973.7      
Designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Payables in CDI interest rate [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   (395.0)   (443.6)
Fair value (1,515.8)   (1,568.6)  
Amounts payable 1,515.8      
Designated as hedge accounting [member] | Interest rate swaps in brazilian reais [member]        
Summary of risks and financial instruments [line items]        
Fair value 35.6   (3.3)  
Amounts receivable 859.1      
Amounts payable 823.5      
Designated as hedge accounting [member] | Interest rate swaps in brazilian reais [member] | Receivables in fixed interest rates ipca [member]        
Summary of risks and financial instruments [line items]        
Notional amount 806.1   566.1  
Fair value 859.1   583.3  
Amounts receivable 859.1      
Designated as hedge accounting [member] | Interest rate swaps in brazilian reais [member] | Payables cdi [member]        
Summary of risks and financial instruments [line items]        
Notional amount (806.1)   (566.1)  
Fair value (823.5)   (586.6)  
Amounts payable 823.5      
Designated as hedge accounting [member] | Options [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   149.4    
Fair value 0.3      
Amounts receivable 0.3      
Designated as hedge accounting [member] | Options [member] | Zero Cost Collar Reaisx US Dollars [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   149.4    
Fair value 0.3      
Amounts receivable 0.3      
Not designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member]        
Summary of risks and financial instruments [line items]        
Fair value 276.0   44.4  
Amounts receivable 965.7      
Amounts payable 689.7      
Not designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Receivables In U S Dollars LIBOR [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   60.0   60.0
Fair value 234.1   195.7  
Amounts receivable 234.1      
Not designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Receivables in US dollars fixed [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   856.8   753.0
Fair value 731.6   157.5  
Amounts receivable 731.6      
Not designated as hedge accounting [member] | Exchange Rate Swap Receivable In U S Dollars [member] | Payables in CDI interest rate [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   (916.8)   (813.0)
Fair value (689.7)   (308.8)  
Amounts payable 689.7      
Not designated as hedge accounting [member] | Exchange rate swaps payable in US dollars coupon [member]        
Summary of risks and financial instruments [line items]        
Fair value     0.1  
Amounts receivable 33.9      
Amounts payable 33.9      
Not designated as hedge accounting [member] | Exchange rate swaps payable in US dollars coupon [member] | Receivables in cdi interest rates [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   8.9   9.1
Fair value 33.9   29.9  
Amounts receivable 33.9      
Not designated as hedge accounting [member] | Exchange rate swaps payable in US dollars coupon [member] | Payables in us dollars fixed [member]        
Summary of risks and financial instruments [line items]        
Notional amount | $   $ (8.9)   $ (9.1)
Fair value (33.9)   R$ (29.8)  
Amounts payable R$ 33.9