Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (91.3)	$ 631.7	$ 876.3
Other comprehensive income (loss):
Foreign currency translation adjustments	(13.2)	(12.1)	41.5
Cash flow hedging derivative activity, net of tax	10.3	10.9	10.8
Pension and other postretirement benefit plans activity, net of tax	1.5	43.1	49.4
Available-for-sale securities activity, net of tax	(0.4)	(1.9)	(0.1)
Total Other Comprehensive Income (Loss)	(1.8)	40.0	101.6
Comprehensive Income (Loss)	$ (93.1)	$ 671.7	$ 977.9