Goodwill and Intangible Assets, Finite-lived intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 200.1	$ 202.0
Finite-Lived Intangible Assets, Accumulated Amortization	(31.7)	(25.3)
Finite-Lived Intangible Assets, Net	168.4	176.7
FMC Agricultural Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	107.6
FMC Health and Nutrition [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	50.7
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	129.6	131.4
Finite-Lived Intangible Assets, Accumulated Amortization	(11.8)	(8.6)
Finite-Lived Intangible Assets, Net	117.8	122.8
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0.6	0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.2)	(0.2)
Finite-Lived Intangible Assets, Net	0.4	0.4
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1.5	1.5
Finite-Lived Intangible Assets, Accumulated Amortization	(0.4)	(0.2)
Finite-Lived Intangible Assets, Net	1.1	1.3
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	63.5	63.6
Finite-Lived Intangible Assets, Accumulated Amortization	(16.9)	(14.4)
Finite-Lived Intangible Assets, Net	46.6	49.2
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4.9	4.9
Finite-Lived Intangible Assets, Accumulated Amortization	(2.4)	(1.9)
Finite-Lived Intangible Assets, Net	$ 2.5	$ 3.0