Supplemental Balance Sheet Information (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Oct. 31, 2019	Jul. 31, 2019
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (847.9)	$ (831.2)
Property, plant and equipment, net	606.2	588.9
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24.3	24.2
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	328.3	325.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	824.9	813.5
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	143.4	142.8
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 133.2	$ 114.3