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Discontinued Operations - Components of Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes $ (35.8) $ (9.7) $ (14.6) $ (8.1) $ 8.4 $ (18.4) $ (10.8) $ (7.5) $ (68.2) $ (28.3) $ (63.3)
Adjustment for workers' compensation, product liability, and other postretirement benefits and other, tax                 (10.2) (3.7) (18.6)
Provision for environmental liabilities, net of recoveries, tax                 8.2 6.0 6.3
Provision for legal reserves and expenses, net of recoveries, tax                 12.2 7.6 6.3
Adjustment for workers’ compensation, product liability, and other postretirement benefits and other, net of income tax benefit (expense)                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 (8.3) 1.0 (15.9)
Provision for environmental liabilities, net of recoveries, net of income tax benefit (expense)                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 (29.7) (24.1) (23.5)
Provision for legal reserves and expenses, net of recoveries, net of income tax benefit (expense)                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 (45.6) (28.9) (23.3)
Discontinued Real Estate                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 15.4 23.7 20.7
Discontinued operations, tax                 (4.1) (6.3) (5.5)
FMC Lithium                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 0.0 0.0 (21.3)
Discontinued operations, tax                 0.0   (12.3)
FMC Lithium | Discontinued Operations, Disposed of by Sale                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations, net of income taxes                 $ 0.0 $ 0.0 $ (21.3)