Business Segment Information - Net Sales to External Customers by Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Net sales
Total net sales	$ 845.0	$ 930.0	$ 2,456.0	$ 2,748.2
United States
Net sales
Total net sales	400.3	431.5	1,179.0	1,269.7
Europe, Middle East and Africa
Net sales
Total net sales	318.9	337.3	905.9	979.5
Asia Pacific and other Americas
Net sales
Total net sales	$ 125.8	$ 161.2	$ 371.1	$ 499.0