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Biological assets - Significant unobservable inputs (Details)
 12 Months Ended
Dec. 31, 2017
ton / hectare
$ / ton
kilogram / ton
$ / hectare
Dec. 31, 2016
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 11.4 12.0
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 700 600
Harvest costs | $ / ton 14.0 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 1.5 2.0
Commercial costs 50 66
Production costs 200 170
Sown land – crops, wheat | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 5.1 2.8
Commercial costs 110 97
Production costs 540 250
Sown land – crops, corn | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 4.0 5.4
Commercial costs 107 150
Production costs 230 350
Sown land – crops, corn | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 8.0 7.7
Commercial costs 300 225
Production costs 500 550
Sown land – crops, soybean | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.4 2.7
Commercial costs 172 70
Production costs 250 270
Sown land – crops, soybean | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 3.4 3.8
Commercial costs 176 110
Production costs 350 400
Sown land – crops, sunflower | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 2.1 1.5
Commercial costs 10 65
Production costs 230 200
Sown land – crops, sunflower | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 3.5 2.1
Commercial costs 37 90
Production costs 350 300
Sown land – rice | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 5.0 5.1
Commercial costs | $ / hectare 3 8
Production costs | $ / hectare 750 750
Sown land – rice | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 5.9 6.1
Commercial costs | $ / hectare 9 15
Production costs | $ / hectare 1,000 1,000