Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended								3 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 FMC's Stockholders' Equity		Sep. 30, 2014 Noncontrolling Interest [Member]		Dec. 31, 2014 Noncontrolling Interest [Member]	Oct. 03, 2014 Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity, beginning balance					$ 1,572.1				$ 1,519.8		$ 52.3
Net income	60.1		19.9		243.8		276.1		231.0		12.8
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options					18.9				18.9		0
Excess tax benefit from share-based compensation					4.4				4.4		0
Shares for benefit plan trust					(0.9)				(0.9)		0
Net unrealized pension and other benefit actuarial gains/(losses) and prior service (cost) credits	5.5		5.9		18.1	[1]	27.5		18.1	[1]	0	[1]
Unrealized hedging gains/(losses) and other	0.5		0.3		7.2	[1]	(5.0)		7.2	[1]	0	[1]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(34.7)	[2]	14.9	[2]	11.7	[1],[2]	1.4	[2]	12.7	[1]	(1.0)	[1]
Dividends					(60.0)				(60.0)		0
Shares repurchased, value					(4.3)				(4.3)		0
Distributions to noncontrolling interests					28.5				25.5		3.0
Total equity, ending balance	1,784.3				1,784.3				1,723.2		61.1
Payments of Ordinary Dividends, Common Stock					58.1	[3]	55.6	[3]
Common Stock, Dividends, Per Share, Declared					$ 0.45
Dividends, payment date	Oct. 16, 2014
Dividends payable, current	20.1				20.1
Dividends, record date	Sep. 30, 2014
Remaining authorized repurchase amount	250.0				250.0
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	6.25%				6.25%
Noncontrolling Interest, Ownership Percentage by Parent	93.75%				93.75%									100.00%
Payments of Ordinary Dividends, Noncontrolling Interest					21.4		89.9
Proceeds from (Payments to) Noncontrolling Interests													$ 77.1

[1] See condensed consolidated statements of comprehensive income.

[2] Income taxes are not provided on the equity in undistributed earnings of our foreign subsidiaries or affiliates since it is our intention that such earnings will remain invested in those affiliates permanently. The amount for the nine months end September 30, 2014 includes reclassification to net income due to the divestiture of our FMC Peroxygens business, see Note 15 within these condensed consolidated financial statements for more information. In accordance with accounting guidance, this amount was previously factored into the lower of cost or fair value test associated with the 2013 Peroxygens' asset held for sale write-down charges.

[3] See Note 14 regarding quarterly cash dividend