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Goodwill and Intangible Assets - Intangibles by Segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Finite-lived $ 1,081.4   $ 1,081.4   $ 1,089.4
Indefinite-lived 1,658.5   1,658.5   $ 1,542.4
Amortization expense 15.9 $ 5.6 47.0 $ 15.9  
FMC Agricultural Solutions          
Segment Reporting Information [Line Items]          
Finite-lived 1,080.5   1,080.5    
Indefinite-lived 1,658.5   1,658.5    
FMC Lithium          
Segment Reporting Information [Line Items]          
Finite-lived 0.9   0.9    
Indefinite-lived $ 0.0   $ 0.0