Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Apr. 30, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Total long-lived assets	$ 966.5	$ 910.1
United States
Segment Reporting Information [Line Items]
Total long-lived assets	495.8	472.8
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	363.9	352.3
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 106.8	$ 85.0