Condensed Consolidated Statements of Changes in Equity Statement - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock, $0.10 Par Value	Capital In Excess of Par	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Non-controlling Interest
Beginning balance at Dec. 31, 2020		$ 2,984.2	$ 100.0	$ 3,084.2	$ 18.6	$ 860.2	$ 4,506.4	$ 98.5	$ 4,604.9	$ (282.2)	$ 1.5	$ (280.7)	$ (2,141.2)	$ 22.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		185.1					184.5							0.6
Stock compensation plans		9.6				5.2							4.4
Shares for benefit plan trust		(0.1)											(0.1)
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[1]	1.4								1.4
Net hedging gains (losses) and other, net of income tax	[1]	44.6								44.6
Foreign currency translation adjustments	[1]	(49.8)								(49.5)				(0.3)
Dividends		(62.0)					(62.0)
Repurchases of common stock		(82.7)											(82.7)
Ending balance at Mar. 31, 2021		3,130.3		3,130.3	18.6	865.4	4,727.4		4,727.4	(284.2)		(284.2)	(2,219.6)	22.7
Beginning balance at Dec. 31, 2020		2,984.2	$ 100.0	3,084.2	18.6	860.2	4,506.4	$ 98.5	4,604.9	(282.2)	$ 1.5	(280.7)	(2,141.2)	22.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		552.3
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022		4.7
Ending balance at Sep. 30, 2021		3,154.0		3,154.0	18.6	874.6	4,968.9		4,968.9	(291.2)		(291.2)	(2,442.5)	25.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to FMC stockholders		548.9
Beginning balance at Mar. 31, 2021		3,130.3		3,130.3	18.6	865.4	4,727.4		4,727.4	(284.2)		(284.2)	(2,219.6)	22.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		205.0					204.7							0.3
Stock compensation plans		5.6				5.1							0.5
Shares for benefit plan trust		2.5											2.5
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[1]	1.5								1.5
Net hedging gains (losses) and other, net of income tax	[1]	(40.9)								(40.9)
Foreign currency translation adjustments	[1]	15.3								14.9				0.4
Dividends		(62.0)					(62.0)
Repurchases of common stock		(25.2)											(25.2)
Ending balance at Jun. 30, 2021		3,232.1		3,232.1	18.6	870.5	4,870.1		4,870.1	(308.7)		(308.7)	(2,241.8)	23.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		162.2					159.7							2.5
Stock compensation plans		4.1				4.1							0.0
Shares for benefit plan trust		(0.7)											(0.7)
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[1]	1.8								1.8
Net hedging gains (losses) and other, net of income tax	[1]	42.2								42.2
Foreign currency translation adjustments	[1]	(26.8)								(26.5)				(0.3)
Dividends	[1]	(60.9)					(60.9)
Repurchases of common stock		(200.0)											(200.0)
Ending balance at Sep. 30, 2021		3,154.0		3,154.0	18.6	874.6	4,968.9		4,968.9	(291.2)		(291.2)	(2,442.5)	25.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to FMC stockholders		159.7
Beginning balance at Dec. 31, 2021		3,143.7		3,143.7	18.6	880.4	5,092.9		5,092.9	(325.5)		(325.5)	(2,542.1)	19.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		211.6					207.4							4.2
Stock compensation plans		14.5				10.5							4.0
Shares for benefit plan trust		0.1											0.1
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[2]	3.6								3.6
Net hedging gains (losses) and other, net of income tax	[2]	(84.1)								(84.1)
Foreign currency translation adjustments	[2]	(39.4)								(39.4)				0.0
Dividends		(66.9)					(66.9)
Repurchases of common stock		(8.6)											(8.6)
Distributions to noncontrolling interests		(0.5)												(0.5)
Ending balance at Mar. 31, 2022		3,174.0		3,174.0	18.6	890.9	5,233.4		5,233.4	(445.4)		(445.4)	(2,546.6)	23.1
Beginning balance at Dec. 31, 2021		3,143.7		3,143.7	18.6	880.4	5,092.9		5,092.9	(325.5)		(325.5)	(2,542.1)	19.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		461.1
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022		6.7
Ending balance at Sep. 30, 2022		3,203.6			18.6	903.3	5,354.8			(542.0)			(2,546.5)	15.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to FMC stockholders		462.6
Beginning balance at Mar. 31, 2022		3,174.0		3,174.0	18.6	890.9	5,233.4		5,233.4	(445.4)		(445.4)	(2,546.6)	23.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		131.2					134.2							(3.0)
Stock compensation plans		6.9				6.6							0.3
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[2]	3.2								3.2
Net hedging gains (losses) and other, net of income tax	[2]	48.0								48.0
Foreign currency translation adjustments	[2]	(77.3)								(76.0)				(1.3)
Dividends		(66.9)					(66.9)
Ending balance at Jun. 30, 2022		3,219.1		$ 3,219.1	18.6	897.5	5,300.7		$ 5,300.7	(470.2)		$ (470.2)	(2,546.3)	18.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		118.3												(2.7)
Stock compensation plans		5.9				5.8							0.1
Total pension and other postretirement benefits, net of tax expense (benefit) of $1.2 as computed and zero as reported for the three months ended September 30, 2022	[2]	(0.1)								(0.1)
Net hedging gains (losses) and other, net of income tax	[2]	20.1								20.1
Foreign currency translation adjustments	[2]	(92.5)								(91.8)				(0.7)
Dividends		(66.9)					(66.9)
Repurchases of common stock		(0.3)											(0.3)
Ending balance at Sep. 30, 2022		3,203.6			$ 18.6	$ 903.3	5,354.8			$ (542.0)			$ (2,546.5)	$ 15.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to FMC stockholders		$ 121.0					$ 121.0

[1] See condensed consolidated statements of comprehensive income (loss).

[2] See condensed consolidated statements of comprehensive income (loss).