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Revenue Recognition - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
product
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]    
Maximum payment term 360 days  
Period between delivery and receipt of payment 1 year  
Opening contract liability revenue recognized $ 492.7  
Contract with customer, liability $ 347.1 $ 492.7
Expected maximum duration of contract 1 year  
Tolling services period 5 years  
Service arrangement, payment period 30 days  
Amortization period 1 year  
Transfer period, adjustment threshold 1 year  
Remaining performance obligation, contract period, disclosure threshold 1 year  
Minimum    
Disaggregation of Revenue [Line Items]    
Contract payment term 30 days  
Maximum    
Disaggregation of Revenue [Line Items]    
Contract payment term 90 days  
FMC Agricultural Solutions    
Disaggregation of Revenue [Line Items]    
Number of product categories | product 3