Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Jan. 31, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
Total long-lived assets	$ 1,023.8	$ 976.0
United States
Segment Reporting Information [Line Items]
Total long-lived assets	550.2	516.7
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	349.6	340.7
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 124.0	$ 118.6