Derivatives And Hedging Activities Notional Amount of Forward Contracts (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Derivative, Notional Amount	$ 180.0	$ 96.7	$ 60.4
Tobacco purchases [Member] | Derivatives Designated As Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	123.2	76.9	43.3
Processing costs [Member] | Derivatives Not Designated As Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	35.1	19.8	17.1
Crop input sales [Member] | Derivatives Not Designated As Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 21.7	$ 0.0	$ 0.0