Leases (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Leases [Abstract]
Operating lease cost	$ 10.3	$ 10.6	$ 20.8	$ 21.4
Finance lease cost:
Amortization of right-of-use assets	0.4	0.6	0.8	1.1
Interest on lease liabilities	0.0	0.1	0.0	0.1
Variable lease cost	5.6	5.7	11.7	11.0
Short-term lease cost	10.8	9.3	22.6	20.1
Sublease income	(0.3)	(0.3)	(0.6)	(0.6)
Net lease cost	$ 26.8	$ 26.0	$ 55.3	$ 53.1