Leases (Details) - USD ($) $ in Millions	Oct. 31, 2019	Apr. 30, 2019
Operating lease right-of-use assets	$ 153.2	$ 0.0
Current operating lease liabilities	44.4	0.0
Noncurrent operating lease liabilities	116.2	$ 0.0
Total operating lease liabilities	160.6
Total finance lease liabilities	6.1
Machinery and Equipment [Member]
Machinery and equipment	12.1
Accumulated Depreciation [Member]
Accumulated depreciation	(6.1)
Property, Plant and Equipment [Member]
Total property, plant, and equipment	6.0
Other Current Liabilities [Member]
Current finance lease liabilities	2.4
Other Noncurrent Liabilities [Member]
Noncurrent finance lease liabilities	$ 3.7