Common Shares (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Apr. 30, 2023	Mar. 02, 2023
Common Shares Information
Common shares authorized	300.0		300.0
Common shares outstanding	102.1		104.4
Treasury Stock, Common, Shares	44.4		42.1
Equity, Class of Treasury Stock [Line Items]
Payments to repurchase shares	$ 372.0	$ 7.8
Sales and Excise Tax Payable	$ 3.6
Board Authorized Repurchased Plan
Equity, Class of Treasury Stock [Line Items]
Shares authorized to be repurchased under stock repurchase program				2.4
Shares repurchased	2.4	0.0
Payments to repurchase shares	$ 362.8
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	1.1		3.5