Business Segment Information (Schedule of Long-Lived Assets By Country Of Domicile) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
Total long-lived assets	$ 1,032.7	$ 976.0
United States
Segment Reporting Information [Line Items]
Total long-lived assets	558.7	516.7
Europe
Segment Reporting Information [Line Items]
Total long-lived assets	345.6	340.7
Rest of world
Segment Reporting Information [Line Items]
Total long-lived assets	$ 128.4	$ 118.6