Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 183.6	$ 109.8
Earnings Per Share, Diluted	$ 1.79	$ 1.03
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income	$ 183.6	$ 109.8
Earnings Per Share, Diluted	$ 1.79	$ 1.03
Treasury Stock Method [Member]
Earnings Per Share [Abstract]
Net income	$ 183.6	$ 109.8
Weighted Average Number of Shares Outstanding, Basic	102.4	106.3
Weighted-average common shares outstanding – assuming dilution (in shares)	102.8	106.8
Earnings Per Share, Diluted	$ 1.79	$ 1.03
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income	$ 183.6	$ 109.8
Weighted Average Number of Shares Outstanding, Basic	102.4	106.3
Weighted-average common shares outstanding – assuming dilution (in shares)	102.8	106.8
Earnings Per Share, Diluted	$ 1.79	$ 1.03
Employee stock options | Treasury Stock Method [Member]
Earnings Per Share [Abstract]
Dilutive effect (in shares)	0.1	0.1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive effect (in shares)	0.1	0.1
Restricted shares, restricted stock units, and performance units | Treasury Stock Method [Member]
Earnings Per Share [Abstract]
Dilutive effect (in shares)	0.3	0.4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive effect (in shares)	0.3	0.4