Derivative Financial Instruments (Details 4) - USD ($) $ in Millions	Oct. 31, 2019	Apr. 30, 2019	Nov. 30, 2018	Jun. 30, 2018
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	$ 432.8	$ 544.8
Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	93.9	144.9
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross notional amount	$ 800.0	$ 800.0	$ 300.0	$ 500.0