Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 269.6	$ (123.8)
Foreign currency adjustments:
Foreign currency translation gain (loss) arising during the period		49.7	43.2
Total foreign currency translation adjustments	[1]	49.7	43.2
Derivative instruments:
Unrealized hedging gains (losses) and other, net of tax of ($0.7) and ($2.1) for the three months ended March 31, 2018 and 2017, respectively		1.5	1.1
Reclassification of deferred hedging (gains) losses and other, included in net income, net of tax of ($0.2 and ($0.2) for the three months ended March 31, 2018 and 2017, respectively	[2]	0.4	(0.5)
Total derivative instruments, net of tax of ($0.8) and ($2.3) for the three months ended March 31, 2018 and 2017, respectively		1.9	0.6
Pension and other postretirement benefits:
Unrealized actuarial gains (losses) and prior service (costs) credits, net of tax of ($0.7) and $2.7 for the three months ended March 31, 2018 and 2017, respectively	[3]	0.6	4.4
Reclassification of net actuarial and other (gain) loss and amortization of prior service costs, included in net income, net of tax of $1.6 and $2.6 for the three months ended March 31, 2018 and 2017, respectively	[2]	3.0	4.9
Total pension and other postretirement benefits, net of tax of $0.9 and $5.3 for the three months ended March 31, 2018 and 2017, respectively		3.6	9.3
Other comprehensive income (loss), net of tax		55.2	53.1
Comprehensive income (loss)		324.8	(70.7)
Less: Comprehensive income (loss) attributable to the noncontrolling interest		2.8	0.6
Comprehensive income (loss) attributable to FMC stockholders		$ 322.0	$ (71.3)

[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. Note, in the first quarter of 2017, we changed our assertion on unremitted earnings for certain foreign subsidiaries as a result of the sale of our FMC Health and Nutrition segment.

[2] For more detail on the components of these reclassifications and the affected line item in the condensed consolidated statements of income (loss) see Note 14.

[3] 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. The interim adjustments noted above typically reflect the foreign currency translation impacts from the unrealized actuarial gains (losses) and prior service (costs) credits related to our foreign pension and postretirement plans. During the three months ended March 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 which resulted in adjustments to comprehensive income. See Note 15 for more information.