Leases (Details 1) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Leases [Abstract]
Operating lease cost		$ 42.2	$ 43.8	$ 45.4
Finance lease cost:
Amortization of right-of-use assets		1.6	2.0	2.4
Interest on lease liabilities		0.1	0.1	0.1
Variable lease cost		24.9	21.6	23.2
Short-term lease cost		44.5	43.5	37.6
Total lease cost	[1]	$ 113.3	$ 111.0	$ 108.7

[1] Total lease cost does not include sublease income which is immaterial for all years presented.