Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Current assets of discontinued operations held for sale	$ 0.0	$ 293.9
Liabilities
Current liabilities of discontinued operations	0.0	(97.3)
Noncurrent liabilities of discontinued operations	0.0	(46.1)
FMC Lithium | Discontinued Operations, Disposed of by Sale
Assets
Current assets of discontinued operations held for sale	0.0	293.9
Property, plant & equipment	0.0	275.7
Other noncurrent assets	0.0	83.1
Total assets of discontinued operations	0.0	652.7
Liabilities
Current liabilities of discontinued operations	0.0	(97.3)
Noncurrent liabilities of discontinued operations	0.0	(46.1)
Total liabilities of discontinued operations	0.0	(143.4)
Total net assets	$ 0.0	$ 509.3