Restructuring and Other Charges (Income) - Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Charges [Abstract]
Severance and Employee Benefits	$ 10.8	$ 22.0	$ 0.0
Other Charges (Income)	5.2	20.0	0.8
Asset Disposal Charges	46.2	82.1	7.7
Restructuring charges	62.2	124.1	8.5
DuPont Crop restructuring
Restructuring Charges [Abstract]
Severance and Employee Benefits	9.1	16.3
Other Charges (Income)	5.2	16.9
Asset Disposal Charges	12.1	75.1
Restructuring charges	26.4	108.3	0.0
Furadan® product exit
Restructuring Charges [Abstract]
Severance and Employee Benefits	0.0
Other Charges (Income)	0.0
Asset Disposal Charges	34.1
Restructuring charges	34.1
Other items
Restructuring Charges [Abstract]
Severance and Employee Benefits	1.7	5.7	0.0
Other Charges (Income)	0.0	3.1	0.8
Asset Disposal Charges	0.0	7.0	7.7
Restructuring charges	$ 1.7	$ 15.8	$ 8.5