Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Apr. 30, 2023	Apr. 30, 2022
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Investment in equity securities		$ 487.8	$ 0.0
Total long-term debt	[1]	(4,314.2)	(4,310.6)
Carrying Amount [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		24.0	26.6
Derivative financial instruments – net		4.7	24.8
Investment in equity securities		487.8	0.0
Total long-term debt		(4,314.2)	(4,310.6)
Fair Value [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		24.0	26.6
Derivative financial instruments – net		4.7	24.8
Investment in equity securities		487.8	0.0
Total long-term debt		$ (3,879.1)	$ (3,977.7)

[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.