Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (1,230.8)	$ 744.0	$ (91.3)
Net income (loss) per common share - assuming dilution (in dollars per share)	$ (11.57)	$ 7.13	$ (0.86)
Treasury Stock Method
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (1,230.8)	$ 744.0	$ (91.3)
Weighted-average common shares outstanding (in shares)	106.4	104.1	106.2
Weighted-average common shares outstanding – assuming dilution (in shares)	106.4	104.4	106.2
Net income (loss) per common share - assuming dilution (in dollars per share)	$ (11.57)	$ 7.13	$ (0.86)
Employee Stock Option [Member] | Treasury Stock Method
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: Dilutive effect (in shares)	0.0	0.1	0.0
Restricted shares, restricted stock units, and performance units | Treasury Stock Method
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: Dilutive effect (in shares)	0.0	0.2	0.0