Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 109.8	$ 153.9
Other comprehensive income (loss):
Foreign currency translation adjustments	1.4	(4.0)
Cash flow hedging derivative activity, net of tax	2.5	2.3
Pension and other postretirement benefit plans activity, net of tax	0.4	(2.6)
Available-for-sale securities activity, net of tax	(0.3)	0.1
Total Other Comprehensive Income (Loss)	4.0	(4.2)
Comprehensive Income	$ 113.8	$ 149.7