Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 480.2	$ 511.5	$ 538.4
Foreign currency adjustments:
Foreign currency translation gain (loss) arising during the period		(18.5)	(100.8)	172.7
Reclassification of foreign currency translations losses		0.0	0.0	13.9
Total foreign currency translation adjustments	[1]	(18.5)	(100.8)	186.6
Derivative instruments:
Unrealized hedging gains (losses) and other, net of tax of $(16.7), $2.6 and $0.5		(69.0)	13.7	(1.2)
Reclassification of deferred hedging (gains) losses and other, included in net income, net of tax of $(3.0), $(3.1) and $(0.1) (3)	[2]	(8.2)	(7.7)	(0.7)
Total derivative instruments, net of tax of $(19.7), $(0.5) and $0.4		(77.2)	6.0	(1.9)
Pension and other postretirement benefits:
Unrealized actuarial gains (losses) and prior service (costs) credits, net of tax of $(1.4), $1.3 and $1.9 (2)	[3]	(6.5)	4.2	0.6
Reclassification of net actuarial and other (gain) loss, amortization of prior service costs and settlement charges, included in net income, net of tax of $2.6, $4.3 and $14.5	[2]	9.9	16.5	51.6
Total pension and other postretirement benefits, net of tax		3.4	20.7	52.2
Other comprehensive income (loss), net of tax		(92.3)	(74.1)	236.9
Comprehensive income (loss)		387.9	437.4	775.3
Less: Comprehensive income (loss) attributable to the noncontrolling interest		(0.5)	3.9	1.4
Comprehensive income (loss) attributable to FMC stockholders		$ 388.4	$ 433.5	$ 773.9

[1] Income taxes are not provided for other outside basis differences inherent in our investments in subsidiaries because the investments and related unremitted earnings are essentially permanent in duration or we have concluded that no additional tax liability will arise upon disposal or remittance. 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 consolidated statements of income (loss) see Note 17 within these consolidated financial statements.

[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. During the years ended December 31, 2018 and 2017, due to the announced plans to separate FMC Lithium and divest FMC Health and Nutrition, respectively, we triggered a curtailment of our U.S. pension plans. As a result, we revalued our pension plans as of October 31, 2018 and March 31, 2017, respectively, in addition to the normal December 31st remeasurement, which resulted in adjustments to comprehensive income. See Note 15 for more information.