Other Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		Jul. 31, 2022	Apr. 30, 2022
Carrying amount and fair value of financial instruments
Total long-term debt	[1]	$ (4,311.5)	$ (4,310.6)
Carrying Amount [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		25.8	26.6
Derivative financial instruments – net		4.8	24.8
Total long-term debt		(4,311.5)	(4,310.6)
Fair Value [Member]
Carrying amount and fair value of financial instruments
Marketable securities and other investments		25.8	26.6
Derivative financial instruments – net		4.8	24.8
Total long-term debt		$ (3,986.3)	$ (3,977.7)

[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.