Discontinued Operations - Components Comprising Net Income (Loss) from Discontinued Operations, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		15 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (0.9)	$ (401.6)	$ 13.2	$ (293.3)
Arysta | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0.0	422.1	65.3	1,414.6
Cost of sales	0.0	(260.0)	(45.5)	(850.7)
Selling, technical, general and administrative	(0.4)	(103.6)	(37.8)	(375.5)
Research and development	0.0	(12.0)	(4.6)	(38.9)
(Loss) gain on Arysta Sale	(0.1)	(376.0)	2.4	(376.0)	$ (448.0)
Operating loss	(0.5)	(329.5)	(20.2)	(226.5)
Other, net	0.7	(30.3)	9.4	(14.5)
Income (loss) from discontinued operations, before income taxes	0.2	(359.8)	(10.8)	(241.0)
Income tax (expense) benefit	(1.1)	(41.8)	24.0	(52.3)
(Loss) income from discontinued operations, net of tax	(0.9)	(401.6)	13.2	(293.3)
Net income from discontinued operations attributable to the non-controlling interests	0.0	(1.0)	0.0	(0.8)
Net (loss) income from discontinued operations attributable to common stockholders	$ (0.9)	$ (402.6)	$ 13.2	$ (294.1)