Goodwill and Intangible Assets, Finite-lived intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 237.3	$ 240.9
Finite-Lived Intangible Assets, Accumulated Amortization	(47.4)	(37.7)
Finite-Lived Intangible Assets, Net	189.9	203.2
FMC Agricultural Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	103.0
FMC Health and Nutrition [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	85.7
FMC Minerals [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	1.2
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	155.6	159.3
Finite-Lived Intangible Assets, Accumulated Amortization	(21.0)	(15.2)
Finite-Lived Intangible Assets, Net	134.6	144.1
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1.8	0.4
Finite-Lived Intangible Assets, Accumulated Amortization	(0.1)	0
Finite-Lived Intangible Assets, Net	1.7	0.4
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1.3	1.3
Finite-Lived Intangible Assets, Accumulated Amortization	(0.6)	(0.4)
Finite-Lived Intangible Assets, Net	0.7	0.9
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	75.0	75.6
Finite-Lived Intangible Assets, Accumulated Amortization	(23.3)	(19.3)
Finite-Lived Intangible Assets, Net	51.7	56.3
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3.6	4.3
Finite-Lived Intangible Assets, Accumulated Amortization	(2.4)	(2.8)
Finite-Lived Intangible Assets, Net	$ 1.2	$ 1.5