Discontinued Operations - Components Comprising Net Income (Loss) from Discontinued Operations, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
(Loss) income from discontinued operations, net of tax	$ (1.1)	$ 13.3	$ (242.9)
Disposed of by Sale | Agricultural Solutions Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Net sales		65.3	1,991.8
Cost of sales		(45.5)	(1,190.3)
Selling, technical, general and administrative		(37.2)	(466.4)
Research and development		(4.6)	(52.4)
Gain (loss) on Arysta Sale		2.4	(450.0)
Operating loss		(19.6)	(167.3)
Other, net		9.0	11.5
Loss from discontinued operations, before income taxes		(10.6)	(155.8)
Income tax benefit (expense)		23.9	(87.1)
(Loss) income from discontinued operations, net of tax		13.3	(242.9)
Net income from discontinued operations attributable to the non-controlling interests		0.0	(3.0)
Net income (loss) from discontinued operations attributable to common stockholders	$ (1.1)	$ 13.3	$ (245.9)