Goodwill and Intangible Assets, Indefinite Life Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 39.0	$ 39.0
Finite and Indefinite lived intangible assets, gross	239.1	241.0
Finite-Lived Intangible Assets, Accumulated Amortization	31.7	25.3
Intangible Assets, Net (Excluding Goodwill)	207.4	215.7
FMC Agricultural Solutions [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	35.2
FMC Health and Nutrition [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	3.2
FMC Minerals [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	0
Trade Names [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	36.3	36.3
Other Intangible Assets [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 2.7	$ 2.7