Derivative Financial Instruments (Details 3) - USD ($) $ in Millions	12 Months Ended
Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Price Risk Derivatives [Abstract]
Net derivative gains (losses) recognized and classified as unallocated	$ (1.7)	$ 78.3	$ 92.6
Less: Net derivative gains (losses) reclassified to segment operating profit	19.7	101.7	(1.0)
Change in net cumulative unallocated derivative gains and losses	$ (21.4)	$ (23.4)	$ 93.6

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration