Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Apr. 30, 2025	Apr. 30, 2024
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Total long-term debt	[1]	$ (7,036.8)	$ (7,773.0)
Carrying Amount [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		20.0	22.1
Derivative financial instruments – net		62.1	28.2
Total long-term debt		(7,036.8)	(7,773.0)
Fair Value [Member]
Carrying Amount and Fair Value of Financial Instruments [Abstract]
Marketable securities and other investments		20.0	22.1
Derivative financial instruments – net		62.1	28.2
Total long-term debt		$ (7,242.0)	$ (7,652.9)

[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.