Derivative Financial Instruments (Details 3) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Price Risk Derivatives [Abstract]
Net derivative gains (losses) recognized and classified as unallocated	$ 14.5	$ 35.4	$ 42.5	$ 57.5
Less: Net derivatives gains (losses) reclassified to segment operating profit	36.9	1.6	80.4	(24.0)
Change in net cumulative unallocated derivative gains and losses	$ (22.4)	$ 33.8	$ (37.9)	$ 81.5

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 http://asc.fasb.org/extlink&oid=121590274&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 http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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