Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Apr. 30, 2024	Apr. 30, 2023
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Investment in equity securities		$ 0.0	$ 487.8
Total long-term debt	[1]	(7,773.0)	(4,314.2)
Carrying Amount [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		22.1	24.0
Derivative financial instruments – net		28.2	4.7
Investment in equity securities		0.0	487.8
Total long-term debt		(7,773.0)	(4,314.2)
Fair Value [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		22.1	24.0
Derivative financial instruments – net		28.2	4.7
Investment in equity securities		0.0	487.8
Total long-term debt		$ (7,652.9)	$ (3,879.1)

[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, offering discounts, and terminated interest rate contracts.