Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Contingency
Income tax (benefit) expense	$ (10.4)	$ 9.9
Arysta | Discontinued Operations, Disposed of by Sale
Income Tax Contingency
Decrease in deferred tax asset	173.0
Decrease in deferred tax asset valuation allowance	75.0
Decrease in deferred tax liability	$ 450.0