Income Taxes (Details 1) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Current:
Federal	$ 201.8	$ 251.3	$ 188.7
Foreign	9.2	11.7	8.5
State and local	39.0	46.7	42.4
Deferred:
Federal	(48.1)	(3.3)	7.1
Foreign	0.3	(7.9)	0.6
State and local	9.9	(2.9)	(0.1)
Total income tax expense (benefit)	$ 212.1	$ 295.6	$ 247.2