Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Jan. 31, 2025	Jan. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (662.3)	$ (24.5)	$ 185.0	$ 120.4	$ 194.9	$ 183.6	$ (501.8)	$ 498.9
Net income (loss) per common share – assuming dilution	$ (6.22)			$ 1.13			$ (4.72)	$ 4.81
Treasury Stock Method [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (662.3)			$ 120.4			$ (501.8)	$ 498.9
Weighted-average common shares outstanding	106.4			105.9			106.4	103.5
Weighted-average common shares outstanding – assuming dilution (in shares)	106.4			106.1			106.4	103.8
Net income (loss) per common share – assuming dilution	$ (6.22)			$ 1.13			$ (4.72)	$ 4.81
Employee stock options | Treasury Stock Method [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive effect (in shares)	0.0			0.0			0.0	0.0
Restricted shares, restricted stock units, and performance units | Treasury Stock Method [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive effect (in shares)	0.0			0.2			0.0	0.3