Derivative Financial Instruments (Details 4) - Cash Flow Hedges - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
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)		69.7	13.6	13.5
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive	[1]	(12.8)	(13.6)	(13.5)
Other Nonoperating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive	[2]	$ (56.9)	$ 0.0	$ 0.0

[1] Interest expense – net, as presented in the Statements of Consolidated Income (Loss), was $388.7, $264.3, and $152.0 in 2025, 2024, and 2023, respectively. The reclassification includes terminated contracts which were designated as cash flow hedges.

[2] Other debt gains (charges) – net, as presented in the Statements of Consolidated Income (Loss), was a gain of $30.2 and a charge of $19.5 in 2025 and 2024, respectively. There were no reported other debt gains (charges) – net in 2023. The reclassification is related to the debt extinguishment due to the tender offers in 2025, as discussed in Note 8: Debt and Financing Arrangements.