Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Total long-lived assets	$ 894.9	$ 877.7
United States
Segment Reporting Information [Line Items]
Total long-lived assets	467.7	464.1
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	345.4	334.4
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 81.8	$ 79.2