Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Jul. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Total long-lived assets	$ 967.4	$ 910.1
United States
Segment Reporting Information [Line Items]
Total long-lived assets	500.6	472.8
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	349.5	352.3
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 117.3	$ 85.0