Discontinued Operations - Components Comprising Net Income (Loss) from Discontinued Operations, Net (Details) - USD ($) $ in Millions	3 Months Ended		15 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 27.4	$ 46.9
Arysta | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	65.3	471.6
Cost of sales	(45.5)	(278.0)
Selling, technical, general and administrative	(36.6)	(136.2)
Research and development	(4.6)	(12.1)
Gain on Arysta Sale	21.3	0.0	$ (429.0)
Operating (loss) profit	(0.1)	45.3
Other, net	9.3	56.7
Income from discontinued operations, before income taxes	9.2	102.0
Income tax benefit (expense)	18.2	(55.1)
Income from discontinued operations, net of tax	27.4	46.9
Net (income) loss from discontinued operations attributable to the non-controlling interests	(0.1)	0.6
Net income from discontinued operations attributable to common stockholders	$ 27.3	$ 47.5