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Biological assets - Significant unobservable inputs (Details) | 12 Months Ended
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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

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