Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Jul. 31, 2023	Apr. 30, 2023
Carrying amount and fair value of financial instruments
Investment in equity securities		$ 459.8	$ 487.8
Total long-term debt	[1]	(4,315.1)	(4,314.2)
Carrying Amount [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		23.8	24.0
Derivative financial instruments – net		(0.9)	4.7
Investment in equity securities		459.8	487.8
Total long-term debt		(4,315.1)	(4,314.2)
Fair Value [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		23.8	24.0
Derivative financial instruments – net		(0.9)	4.7
Investment in equity securities		459.8	487.8
Total long-term debt		$ (3,752.6)	$ (3,879.1)

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