Supplemental Balance Sheet Information (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Oct. 31, 2018	Jul. 31, 2018
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (797.6)	$ (790.4)
Property, plant and equipment, net	517.9	509.3
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23.7	22.8
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	309.2	310.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	775.1	769.1
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	133.4	132.6
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 74.1	$ 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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