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Biological assets - Significant Unobservable Inputs (Details)
 12 Months Ended
Dec. 31, 2019
ton / hectare
$ / ton
kilogram / ton
$ / hectare
Dec. 31, 2018
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 12
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 15
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 0.95 1.2
Commercial costs 6 55
Production costs 115 140
Sown land – crops, wheat | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 4.69 5.2
Commercial costs 43 120
Production costs 574 460
Sown land – crops, corn | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 2.5 2.2
Commercial costs 2 85
Production costs 198 300
Sown land – crops, corn | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 10 9.4
Commercial costs 51 230
Production costs 859 620
Sown land – crops, soybean | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.19 1.1
Commercial costs 7 55
Production costs 159 260
Sown land – crops, soybean | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 3.8 4.1
Commercial costs 59 110
Production costs 679 460
Sown land – crops, sunflower | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 1.6 1.5
Commercial costs 2 45
Production costs 233 220
Sown land – crops, sunflower | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 3 2.1
Commercial costs 71 80
Production costs 641 360
Sown land – rice | Bottom of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 6.5 6
Commercial costs | $ / hectare 8 11
Production costs | $ / hectare 750 830
Sown land – rice | Top of range    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Plant yields 7.5 7.4
Commercial costs | $ / hectare 12 14
Production costs | $ / hectare 950 1,090