Leases (Details) - USD ($) $ in Millions	Oct. 31, 2020	Apr. 30, 2020
Operating lease right-of-use assets	$ 129.8	$ 148.4
Current operating lease liabilities	35.5	36.5
Noncurrent operating lease liabilities	105.7	120.0
Total operating lease liabilities	141.2	156.5
Total finance lease liabilities	5.0	5.7
Machinery and Equipment [Member]
Machinery and equipment	10.1	11.6
Accumulated Depreciation [Member]
Accumulated depreciation	(5.2)	(5.9)
Property, Plant and Equipment [Member]
Total property, plant, and equipment	4.9	5.7
Other Current Liabilities [Member]
Current finance lease liabilities	2.1	2.2
Other Noncurrent Liabilities [Member]
Noncurrent finance lease liabilities	$ 2.9	$ 3.5