Supplemental Balance Sheet Information (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Jul. 31, 2018
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (831.2)	$ (790.4)
Property, plant and equipment, net	569.8	509.3
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24.1	22.8
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	316.1	310.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	810.2	769.1
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	144.4	132.6
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 106.2	$ 64.4

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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