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Financial risk management - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
customer
bank
Dec. 31, 2019
USD ($)
customer
bank
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
 [1]
Disclosure of major customers [line items]        
Proportion of sales designated for hedging activities (as a percent) 15.00% 19.50%    
Gain on hedge ineffectiveness recognised in other comprehensive income $ 46,145 $ 54,312    
Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax (26,031) 15,594    
Cash and cash equivalents $ 336,282 $ 290,276 [1],[2] $ 273,635 [1] $ 269,195
Number of major banks | bank 6 8    
Gearing ratio 50.00% 48.00%    
Notional amount $ 72,299 $ 37,965    
Forward contract        
Disclosure of major customers [line items]        
Notional amount $ 42,200 $ 71,700 $ 63,300  
Bottom of range        
Disclosure of major customers [line items]        
Gearing ratio 40.00%      
Top of range        
Disclosure of major customers [line items]        
Gearing ratio 60.00%      
Credit risk        
Disclosure of major customers [line items]        
Number of major banks | bank 5      
Proportion of total cash deposited in major banks (as a percent) 81.00% 85.00%    
Credit risk | Crops        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 80.00% 96.00%    
Number of well-known customers | customer 36 42    
Credit risk | Ethanol        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 100.00% 100.00%    
Number of well-known customers | customer 46 52    
Credit risk | Sugar        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 78.00% 86.00%    
Number of well-known customers | customer 76 66    
Credit risk | Crystal Sugar        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 22.00% 14.00%    
Credit risk | Energy        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 96.00% 94.00%    
Number of well-known customers | customer 52 52    
Credit risk | Dairy        
Disclosure of major customers [line items]        
Proportion of sales (as a percent) 65.00% 70.00%    
Number of well-known customers | customer 21 36    
Interest rate risk | Itau BBA FINAME Loan        
Disclosure of major customers [line items]        
Notional amount $ 400,000      
Interest rate risk | Floating interest rate        
Disclosure of major customers [line items]        
Interest rate on borrowings (as a percent) 1.85%      
Interest rate risk | Fixed interest rate        
Disclosure of major customers [line items]        
Interest rate on borrowings (as a percent) 4.24%      
Currency risk        
Disclosure of major customers [line items]        
Sensitivity analysis for types of market risk (as a percent) 10.00%      
Argentine Peso | Currency risk | Forward contract        
Disclosure of major customers [line items]        
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 1,800      
Brazilian Reais | Euro-bob swap        
Disclosure of major customers [line items]        
Gain (loss) on hedge ineffectiveness recognised in profit or loss (1,600)      
Brazilian Reais | Currency risk | Forward contract        
Disclosure of major customers [line items]        
Notional amount 23,800      
Gain (loss) on hedge ineffectiveness recognised in profit or loss (1,900) $ (1,100)    
U.S. Dollar | Currency risk | Forward contract        
Disclosure of major customers [line items]        
Notional amount 2,400      
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ (30)      
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1
[2] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.