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Discontinued Operations - Components of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued operations, net of income taxes $ (14.6) $ (10.8) $ (22.7) $ (18.3)
Adjustment for workers' compensation, product liability, and other postretirement benefits and other, tax (1.1) (2.1) (2.1) (2.0)
Provision for environmental liabilities, net of recoveries, tax 0.8 0.7 1.6 1.2
Provision for legal reserves and expenses, net of recoveries, tax 2.7 2.2 3.8 4.2
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 (1.0) 0.3 (2.6) 1.2
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 (3.4) (2.6) (5.7) (4.5)
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 (10.2) (8.5) (14.4) (16.0)
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 0.0 1.0
Discontinued operations, income tax benefit (expense) $ 0.0 $ 0.0 $ 0.0 $ 0.2