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Discontinued Operations - Narrative (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Nov. 01, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2019	Aug. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net pretax actuarial gain and prior service credit		$ 4.4	$ 5.2
After-tax actuarial gain and prior service credit		3.6	4.2
Payments of other discontinued reserves		29.9	24.4	$ 27.8
Workers’ compensation, product liability, and indemnification reserves
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments of other discontinued reserves		1.0	3.8	5.4
Postretirement medical and life insurance benefits reserve, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments of other discontinued reserves		0.5	0.4	1.1
Reserves for legal proceedings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments of other discontinued reserves		28.4	20.2	21.3
Discontinued Operations, Disposed of by Sale | Omega 3
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds on sale						$ 38.0
Discontinued Operations, Held-for-sale or Disposed of by Sale | FMC Health and Nutrition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from disposal, before tax	$ 918.0
Gain on sale of FMC Health and Nutrition, net of income taxes	$ 727.0	$ 0.0	$ 0.0	$ 0.0
Discontinued Operations, Held-for-sale | FMC Health and Nutrition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transitional services period	24 months
Transitional services period, optional extension	6 months
Livent
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Shares of common stock owned (in shares)					123

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