Earnings per Share (Details) - 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
Schedule of Earnings Per Share, Two Class Method [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 (in dollars per share)	$ (6.22)			$ 1.14			$ (4.72)	$ 4.82
Net income (loss) per common share – assuming dilution	$ (6.22)			$ 1.13			$ (4.72)	$ 4.81
Two-class method
Schedule of Earnings Per Share, Two Class Method [Line Items]
Net income (loss)	$ (662.3)			$ 120.4			$ (501.8)	$ 498.9
Less: Net income (loss) allocated to participating securities	0.0			0.0			0.0	0.2
Net income (loss) allocated to common stockholders	$ (662.3)			$ 120.4			$ (501.8)	$ 498.7
Weighted-average common shares outstanding	106.4			105.9			106.4	103.5
Add: Dilutive effect of stock options (in shares)	0.0			0.0			0.0	0.0
Weighted-average common shares outstanding – assuming dilution (in shares)	106.4			105.9			106.4	103.5
Net income (loss) per common share (in dollars per share)	$ (6.22)			$ 1.14			$ (4.72)	$ 4.82
Net income (loss) per common share – assuming dilution	$ (6.22)			$ 1.14			$ (4.72)	$ 4.82