Derivative Financial Instruments (Details 1) - USD ($) $ in Millions	Apr. 30, 2023	Apr. 30, 2022
Other Current Assets
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	$ 19.5	$ 47.1
Other Current Liabilities
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	14.8	22.3
Other Noncurrent Assets
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Liabilities
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Commodity contracts | Other Current Assets | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	18.1	45.4
Commodity contracts | Other Current Liabilities | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	14.7	22.3
Commodity contracts | Other Noncurrent Assets | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Commodity contracts | Other Noncurrent Liabilities | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Foreign currency exchange contracts | Other Current Assets | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	1.4	1.7
Foreign currency exchange contracts | Other Current Liabilities | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.1	0.0
Foreign currency exchange contracts | Other Noncurrent Assets | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Foreign currency exchange contracts | Other Noncurrent Liabilities | Not designated as hedging instruments
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	$ 0.0	$ 0.0