Discontinued Operations - Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	$ 6.5	$ (168.8)
Adjustment for workers’ compensation, product liability, and other postretirement benefits, income tax benefit (expense)	(1.0)	1.3
Provision for environmental liabilities, income tax benefit (expense)	0.5	1.0
Provision for legal reserves and expenses, income tax benefit (expense)	1.8	1.9
Adjustment for workers’ compensation, product liability, other postretirement benefits and other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	3.6	(0.4)
Provision for environmental liabilities, net of recoveries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	(3.2)	(2.8)
Provision for legal reserves and expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	(7.1)	(3.5)
FMC Health and Nutrition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	13.2	(162.1)
Discontinued operations, income tax benefit (expense)	$ (2.6)	$ (5.1)