Basis of Presentation and Significant Accounting Policies - Prior Year Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Prior Year Reclassifications [Line Items]
Operating expenses	$ 1,184.5	$ 1,161.3	$ 3,544.1	$ 3,430.1
Selling, general and administrative expenses	$ 101.3	108.0	$ 299.2	310.2
Reclassification adjustment
Prior Year Reclassifications [Line Items]
Operating expenses		(5.2)		(15.1)
Selling, general and administrative expenses		$ 5.2		$ 15.1