Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings attributable to FMC stockholders:
Income from continuing operations attributable to FMC stockholders	$ 76.8	$ 74.5	$ 314.2	$ 325.1
Discontinued operations, net of income taxes	(20.5)	(56.6)	(83.2)	(58.3)
Net income attributable to FMC stockholders	56.3	17.9	231.0	266.8
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	0.2	0.2	0.6	1.1
Net income allocable to common stockholders	$ 56.1	$ 17.7	$ 230.4	$ 265.7
Basic earnings per common share attributable to FMC stockholders:
Continuing operations	$ 0.57	$ 0.55	$ 2.35	$ 2.39
Discontinued operations	$ (0.15)	$ (0.42)	$ (0.62)	$ (0.43)
Net income	$ 0.42	$ 0.13	$ 1.73	$ 1.96
Diluted earnings per common share attributable to FMC stockholders:
Continuing operations	$ 0.57	$ 0.55	$ 2.34	$ 2.38
Discontinued operations	$ (0.15)	$ (0.42)	$ (0.62)	$ (0.43)
Net income	$ 0.42	$ 0.13	$ 1.72	$ 1.95
Shares:
Weighted average number of shares of common stock outstanding - Basic	133,409,000	134,146,000	133,288,000	135,779,000
Weighted average additional shares assuming conversion of potential common shares	936,000	816,000	997,000	921,000
Shares – diluted basis	134,345,000	134,962,000	134,285,000	136,700,000
Antidilutive shares excluded from diluted EPS	267,000	0	371,000