Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income		$ 538.4	$ 211.7	$ 498.5
Foreign currency adjustments:
Foreign currency translation gain (loss) arising during the period		172.7	(48.7)	(97.3)
Reclassification of foreign currency translations losses		13.9	0.0	0.0
Total foreign currency translation adjustments	[1]	186.6	(48.7)	(97.3)
Derivative instruments:
Unrealized hedging gains (losses) and other, net of tax of $0.5, ($0.2) and $0.4		(1.2)	7.3	0.7
Reclassification of deferred hedging (gains) losses and other, included in net income, net of tax of ($0.1), $3.3 and ($2.7)		(0.7)	6.0	(3.0)
Total derivative instruments, net of tax of $0.4, $3.1 and ($2.3)		(1.9)	13.3	(2.3)
Pension and other postretirement benefits:
Unrealized actuarial gains (losses) and prior service (costs) credits, net of tax of ($16.1), $70.9 and $103.9	[2]	0.6	(26.9)	(26.4)
Reclassification of net actuarial and other (gain) loss, amortization of prior service costs and settlement charges, included in net income, net of tax of $23.2, $12.9 and $21.8	[3]	51.6	39.2	44.1
Total pension and other postretirement benefits, net of tax of $16.4, $12.9 and $7.1		52.2	12.3	17.7
Other comprehensive income (loss), net of tax		236.9	(23.1)	(81.9)
Comprehensive income		775.3	188.6	416.6
Less: Comprehensive income attributable to the noncontrolling interest		1.4	0.6	9.1
Comprehensive income attributable to FMC stockholders		$ 773.9	$ 188.0	$ 407.5

[1] 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 indefinitely. The amount for 2017 includes reclassification to net income due to the divestiture of our FMC Health and Nutrition segment which includes the portion of FMC Health and Nutrition sold to DuPont and the Omega-3 business sold to Pelagia AS. See Note 9 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 2017 Omega-3 asset held for sale write-down charges.

[2] At December 31 of each year, we remeasure our pension and postretirement plan obligations at which time we record any actuarial gains (losses) and prior service (costs) credits to other comprehensive income. During the year ended December 31, 2017, due to the announced plans to divest of FMC Health and Nutrition business, we triggered a curtailment of our U.S. pension plans. As a result, we revalued our pension plans as of March 31, 2017 in addition to the normal December 31st remeasurement, which resulted in adjustments to comprehensive income. See Note 13 for more information.

[3] For more detail on the components of these reclassifications and the affected line item in the consolidated statements of income (loss) see Note 15 within these consolidated financial statements.