Derivative Financial Instruments (Details 4) - USD ($) $ in Millions	Apr. 30, 2020	Apr. 30, 2019	Nov. 30, 2018	Jun. 30, 2018
Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	$ 890.1	$ 544.8
Foreign currency exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	65.6	144.9
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	$ 0.0	$ 800.0	$ 300.0	$ 500.0