Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Total long-lived assets	$ 886.5	$ 877.7
United States
Segment Reporting Information [Line Items]
Total long-lived assets	463.4	464.1
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	342.2	334.4
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 80.9	$ 79.2