Discontinued Operations - Additional Information (Details) - Agricultural Solutions Business - Discontinued Operations, Held-for-sale - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jul. 20, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration receivable						$ 4,200.0
Impairment loss	$ 376.0	$ 0.0	$ 376.0	$ 0.0	$ 376.0