Condensed Statements of Consolidated Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (43.9)	$ 185.0
Other comprehensive income (loss):
Foreign currency translation adjustments	(1.0)	(0.6)
Cash flow hedging derivative activity, net of tax	2.4	2.6
Pension and other postretirement benefit plans activity, net of tax	0.3	0.4
Available-for-sale securities activity, net of tax	0.3	0.0
Total Other Comprehensive Income	2.0	2.4
Comprehensive Income (Loss)	$ (41.9)	$ 187.4