Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Jan. 31, 2025	Apr. 30, 2024
Carrying amount and fair value of financial instruments
Total long-term debt	[1]	$ (7,385.4)	$ (7,773.0)
Carrying Amount [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		21.2	22.1
Derivative financial instruments – net		25.0	28.2
Total long-term debt		(7,385.4)	(7,773.0)
Fair Value [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		21.2	22.1
Derivative financial instruments – net		25.0	28.2
Total long-term debt		$ (7,514.1)	$ (7,652.9)

[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.