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Biological assets - Significant unobservable inputs (Details)
 12 Months Ended
Dec. 31, 2018
ton / hectare
$ / ton
kilogram / ton
$ / hectare
Dec. 31, 2017
ton / hectare
$ / ton
kilogram / ton
$ / hectare
Sown land – sugarcane | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 60 60
TRS value | kilogram / ton 120 120
Maintenance costs | $ / hectare 500 500
Harvest costs | $ / ton 9.0 9.0
Leasing costs 12 11.4
Sown land – sugarcane | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 100 100
TRS value | kilogram / ton 140 140
Maintenance costs | $ / hectare 700 700
Harvest costs | $ / ton 15 14.0
Leasing costs 14.4 14.4
Sown land – crops, wheat | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.2 1.5
Commercial costs 55 55
Production costs 140 200
Sown land – crops, wheat | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 5.2 5.1
Commercial costs 120 110
Production costs 460 540
Sown land – crops, corn | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 2.2 4
Commercial costs 85 107
Production costs 300 230
Sown land – crops, corn | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 9.4 8
Commercial costs 230 300
Production costs 620 550
Sown land – crops, soybean | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.1 1.4
Commercial costs 55 172
Production costs 260 250
Sown land – crops, soybean | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 4.1 3.4
Commercial costs 110 176
Production costs 460 350
Sown land – crops, sunflower | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.5 2.1
Commercial costs 45 10
Production costs 220 230
Sown land – crops, sunflower | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 2.1 3.5
Commercial costs 80 37
Production costs 360 350
Sown land – rice | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 6 5
Commercial costs | $ / hectare 11 3
Production costs | $ / hectare 830 750
Sown land – rice | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 7.4 5.9
Commercial costs | $ / hectare 14 9
Production costs | $ / hectare 1,090 1,000