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Investments in joint ventures - Narrative (Details) - Financial guarantee contracts - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Disclosure of joint ventures [line items]    
Percent of profit 5.00%  
Total capital percent 20.00%  
CHS AGRO S.A.    
Disclosure of joint ventures [line items]    
Financial debt guaranteed   $ 9.8