Leases (Details 3) - USD ($) $ in Millions	Apr. 30, 2022	Apr. 30, 2021
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2023	$ 42.2
2024	30.6
2025	21.6
2026	18.9
2027	5.4
2028 and beyond	2.7
Total undiscounted minimum lease payments	121.4
Less: Imputed interest	5.1
Lease liabilities	116.3	$ 153.9
Finance Lease, Liability, Payment, Due [Abstract]
2023	1.4
2024	1.1
2025	0.8
2026	0.4
2027	0.1
2028 and beyond	0.2
Total undiscounted minimum lease payments	4.0
Less: Imputed interest	0.1
Total finance lease liabilities	$ 3.9	$ 4.3