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Sales - Narrative (Details)
ton in Thousands, megawatt_hour in Thousands, cubic_meter in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
ton
cubic_meter
megawatt_hour
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 68.1 $ 63.3 $ 111.8
Soybean      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 3.6    
Derivative notional amount | ton 14,279    
Wheat      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 5.3    
Derivative notional amount | ton 26,273    
Corn      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 8.5    
Derivative notional amount | ton 53,927    
Sugar      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 2.7    
Derivative notional amount | ton 11,498    
Ethanol      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 6.7    
Cubic meters of product | cubic_meter 12,822    
Energy      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 40.3    
MWh of energy | megawatt_hour 636,647