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Restructuring and Other Charges (Income) - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 62.2	$ 124.1	$ 8.5
Unfavorable court ruling charge		$ 72.8
DuPont Crop restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 26.4	108.3	$ 0.0
Accelerated depreciation charges				17.4
DuPont Crop restructuring \| Change to market access
Restructuring Cost and Reserve [Line Items]
Restructuring charges				59.0
DuPont Crop restructuring \| Severance and other employee benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges				4.0
DuPont Crop restructuring \| Migration of research and development activities and employees
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 28.0
DuPont Crop restructuring \| Future liability of rental obligation
Restructuring Cost and Reserve [Line Items]
Restructuring charges				11.2
DuPont Crop restructuring \| Reduction of capital lease liability
Restructuring Cost and Reserve [Line Items]
Restructuring charges				6.0
DuPont Crop restructuring \| Severance, relocation and other employee related charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 5.2