Leases (Details) - USD ($) $ in Millions	Apr. 30, 2020	Apr. 30, 2019
Operating lease right-of-use assets	$ 148.4	$ 0.0
Current operating lease liabilities	36.5	0.0
Noncurrent operating lease liabilities	120.0	$ 0.0
Total operating lease liabilities	156.5
Total finance lease liabilities	5.7
Machinery and Equipment [Member]
Machinery and equipment	11.6
Accumulated Depreciation [Member]
Accumulated depreciation	(5.9)
Property, Plant and Equipment [Member]
Total property, plant, and equipment	5.7
Other Current Liabilities [Member]
Current finance lease liabilities	2.2
Other Noncurrent Liabilities [Member]
Noncurrent finance lease liabilities	$ 3.5