Derivatives And Hedging Activities Notional Amount of Forward Contracts (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 60.4	$ 94.7	$ 56.3
Forward contracts related to tobacco purchase [Member] | Derivatives Designated As Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	43.3	70.7	43.1
Forward contracts related to tobacco processing costs [Member] | Derivatives Not Designated As Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 17.1	$ 24.0	$ 13.2