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Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Apr. 30, 2019	Apr. 30, 2015	Nov. 30, 2018	Jun. 30, 2018
Derivative Financial Instruments (Textual) [Abstract]
Interest expense – net	$ (45.1)	$ (51.6)	$ (143.6)	$ (158.8)
Amortization of deferred gain on early termination agreement	2.1		6.2
Derivative Financial Instruments (Additional Textual) [Abstract]
Cash margin accounts related to derivative instruments recognized	25.7		25.7		$ 40.7
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses)			$ (14.9)		(52.5)
Commodity contracts
Derivative Financial Instruments (Textual) [Abstract]
Derivative instrument maturity			1 year
Gross notional amount	808.9		$ 808.9		544.8
Foreign currency exchange contracts
Derivative Financial Instruments (Textual) [Abstract]
Derivative instrument maturity			1 year
Gross notional amount	88.1		$ 88.1		144.9
Interest rate contracts
Derivative Financial Instruments (Textual) [Abstract]
Gross notional amount	800.0		800.0		800.0		$ 300.0	$ 500.0
Deferred pre-tax gain (loss) included in accumulated other comprehensive loss	(172.0)		(172.0)		(52.5)
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss	$ 39.6		39.6		$ 12.1
Effective portion of the hedge loss reclassified to interest expense over the next twelve months			(8.9)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			(168.9)
Total Through Q3 2020 [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			39.2
2020 [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			1.9
2021 [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			8.4
2022 [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			$ 4.0
Cash [Member] | Interest rate swap | Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Gain (loss) on early termination agreement						$ 58.1
Accrued and Prepaid Interest, Net [Member] | Interest rate swap | Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Gain (loss) on early termination agreement						$ (4.6)

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Cumulative changes in the values of derivative positions that is recorded in unallocated derivative gains (losses).

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Nominal or face amount used to calculate payment on derivative.

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The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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