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Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jan. 31, 2020	Apr. 30, 2019
Other Current Assets [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	$ 9.0	$ 6.2
Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Current Assets [Member] | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	9.0	6.2
Other Current Assets [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Current Assets [Member] | Commodity contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	8.6	4.8
Other Current Assets [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.4	1.4
Other Current Liabilities [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	185.4	75.1
Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	168.9	49.1
Other Current Liabilities [Member] | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	16.5	26.0
Other Current Liabilities [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	168.9	49.1
Other Current Liabilities [Member] | Commodity contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	16.4	25.8
Other Current Liabilities [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.1	0.2
Other Noncurrent Assets [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Assets [Member] | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Assets [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Assets [Member] | Commodity contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Assets [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Assets	0.0	0.0
Other Noncurrent Liabilities [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Other Noncurrent Liabilities [Member] | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Other Noncurrent Liabilities [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Other Noncurrent Liabilities [Member] | Commodity contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	0.0	0.0
Other Noncurrent Liabilities [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]
Fair value of derivative instruments [Line Items]
Derivatives Instruments, Liabilities	$ 0.0	$ 0.0

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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