Leases (Details) - USD ($) $ in Millions	Jul. 31, 2021	Apr. 30, 2021
Operating lease right-of-use assets	$ 133.5	$ 142.0
Current operating lease liabilities	41.2	41.1
Noncurrent operating lease liabilities	103.9	112.8
Total operating lease liabilities	145.1	153.9
Total finance lease liabilities	3.7	4.3
Machinery and Equipment [Member]
Machinery and equipment	9.3	9.8
Accumulated Depreciation [Member]
Accumulated depreciation	(5.6)	(5.5)
Property, Plant and Equipment [Member]
Total property, plant, and equipment	3.7	4.3
Other Current Liabilities [Member]
Current finance lease liabilities	1.5	1.8
Other Noncurrent Liabilities [Member]
Noncurrent finance lease liabilities	$ 2.2	$ 2.5