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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Cash Flows [Abstract]      
Asset retirement obligation $ 30.7 $ 35.7  
Other cash payments to contract manufacturers 17.4 51.7 $ 13.1
Net proceeds received from initial public offering of FMC Lithium 0.0 0.0 363.6
Cash paid for interest, net of capitalized interest 141.8 140.9 133.4
Income taxes paid, net of refunds 82.1 130.9 135.3
Net interest payments     0.0
Tax payments, net of refunds     10.0
Noncash additions to property, plant and equipment 14.7 18.2 $ 3.1
Asset retirement obligation 30.7 $ 35.7  
Furadan product exit      
Statement of Cash Flows [Abstract]      
Asset retirement obligation 3.6    
Asset retirement obligation $ 3.6