Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Antidilutive shares excluded from diluted EPS (in shares)	500	400	400	200
Earnings (loss) attributable to FMC stockholders:
Continuing operations, net of income taxes	$ 137.2	$ 169.4	$ 504.8	$ 581.3
Discontinued operations, net of income taxes	(16.2)	(9.7)	(42.2)	(32.4)
Net income (loss) attributable to FMC stockholders	121.0	159.7	462.6	548.9
Less: Distributed and undistributed earnings allocable to restricted award holders	(0.3)	(0.4)	(1.1)	(1.3)
Net income (loss) allocable to common stockholders	$ 120.7	$ 159.3	$ 461.5	$ 547.6
Basic earnings (loss) per common share attributable to FMC stockholders:
Continuing operations (in USD per share)	$ 1.09	$ 1.32	$ 3.99	$ 4.51
Discontinued operations (in USD per share)	(0.13)	(0.08)	(0.33)	(0.25)
Net income (loss) attributable to FMC stockholders (in USD per share)	0.96	1.24	3.66	4.26
Diluted earnings (loss) per common share attributable to FMC stockholders:
Continuing operations (in USD per share)	1.08	1.32	3.98	4.48
Discontinued operations (in USD per share)	(0.13)	(0.08)	(0.33)	(0.25)
Net income (loss) attributable to FMC stockholders (in USD per share)	$ 0.95	$ 1.24	$ 3.65	$ 4.23
Shares (in thousands):
Weighted average number of shares of common stock outstanding - Basic (in shares)	126,224	128,313	126,157	128,951
Weighted average additional shares assuming conversion of potential common shares (in shares)	667	678	722	763
Shares – diluted basis (in shares)	126,891	128,991	126,879	129,714