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Risks and Financial Instruments - Sensitivity analysis of floating interest rate risk (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Scenario I [member]    
Exposure of interest rate risk    
Interest effect on cash equivalents and financial investments R$ 29.3 R$ 32.7
Foreign exchange hedging instruments (assets in CDI) effect 0.1 0.1
Interest effect on debt in DI (44.5) (55.0)
Interest rate hedging instruments (liabilities in CDI) effect (39.2) (33.7)
Incremental expenses, CDI (54.3) (55.9)
Interest effect on debt in TJLP (1.2) (1.7)
Incremental expenses, TJLP (1.2) (1.7)
Foreign exchange hedging instruments (assets in LIBOR) effect 1.7 2.8
Interest effect on debt in LIBOR (3.6) (3.6)
Incremental expenses, LIBOR (1.9) (0.8)
Interest effect on debt in TIIE 0.0 (0.1)
Incremental expenses, TIIE 0.0 (0.1)
Interest effect on debt in SELIC (0.3) (0.4)
Incremental expenses, SELIC (0.3) (0.4)
Scenario II [member]    
Exposure of interest rate risk    
Interest effect on cash equivalents and financial investments 73.3 81.7
Foreign exchange hedging instruments (assets in CDI) effect 0.1 0.2
Interest effect on debt in DI (111.2) (137.4)
Interest rate hedging instruments (liabilities in CDI) effect (85.6) (73.4)
Incremental expenses, CDI (123.4) (128.9)
Interest effect on debt in TJLP (3.0) (4.2)
Incremental expenses, TJLP (3.0) (4.2)
Foreign exchange hedging instruments (assets in LIBOR) effect 4.3 6.9
Interest effect on debt in LIBOR (8.9) (9.1)
Incremental expenses, LIBOR (4.6) (2.2)
Interest effect on debt in TIIE 0.0 (0.3)
Incremental expenses, TIIE 0.0 (0.3)
Interest effect on debt in SELIC (0.6) (1.0)
Incremental expenses, SELIC (0.6) (1.0)
Scenario III [member]    
Exposure of interest rate risk    
Interest effect on cash equivalents and financial investments 146.5 163.3
Foreign exchange hedging instruments (assets in CDI) effect 0.3 0.5
Interest effect on debt in DI (222.3) (274.9)
Interest rate hedging instruments (liabilities in CDI) effect (162.9) (139.6)
Incremental expenses, CDI (238.4) (250.7)
Interest effect on debt in TJLP (6.1) (8.3)
Incremental expenses, TJLP (6.1) (8.3)
Foreign exchange hedging instruments (assets in LIBOR) effect 8.6 13.9
Interest effect on debt in LIBOR (17.8) (18.1)
Incremental expenses, LIBOR (9.2) (4.2)
Interest effect on debt in TIIE 0.0 (0.5)
Incremental expenses, TIIE 0.0 (0.5)
Interest effect on debt in SELIC (1.3) (2.0)
Incremental expenses, SELIC R$ (1.3) R$ (2.0)