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Leases (Details 3) - USD ($) $ in Millions	Jan. 31, 2022	Apr. 30, 2021
Operating Lease Liabilities, Payments Due [Abstract]
2022 (remainder of the year)	$ 10.7
2023	41.1
2024	29.8
2025	21.4
2026	18.6
2027 and beyond	7.8
Total undiscounted minimum lease payments	129.4
Less: Imputed interest	5.7
Total operating lease liabilities	123.7	$ 153.9
Finance Lease Liabilities, Payments, Due [Abstract]
2022 (remainder of the year)	0.4
2023	1.3
2024	1.1
2025	0.7
2026	0.3
2027 and beyond	0.0
Total undiscounted minimum lease payments	3.8
Less: Imputed interest	0.1
Total finance lease liabilities	$ 3.7	$ 4.3

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