Derivative Financial Instruments (Details 4) - Cash Flow Hedges - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other comprehensive income (loss)		$ 0.0	$ 0.0	$ 0.0
Change in accumulated other comprehensive income (loss)		13.5	13.1	13.8
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive	[1]	(13.5)	(13.7)	(13.8)
Other Nonoperating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive	[2]	$ 0.0	$ 0.6	$ 0.0

[1] Interest expense – net, as presented in the Statements of Consolidated Income, was $152.0, $160.9, and $177.1 in 2023, 2022, and 2021, respectively. The reclassification includes terminated contracts which were designated as cash flow hedges.

[2] Other income (expense) – net, as presented in the Statements of Consolidated Income, was $14.7, $19.1, and $37.8 in 2023, 2022, and 2021, respectively. The reclassification is related to the debt extinguishment during 2022, as discussed in Note 7: Debt and Financing Arrangements.