Acquisitions and Divestitures - Acquisitions (Detail) $ in Millions	12 Months Ended
	Oct. 31, 2016 USD ($) business Acquisition	Oct. 31, 2015 USD ($) Acquisition	Oct. 31, 2014 USD ($) Company Acquisition
Business Acquisition [Line Items]
Number of acquisitions (acquisition)	0	0	2
Purchase Price, net of Cash	$ 0.4	$ 1.6	$ 53.5
Goodwill	$ 786.4	$ 807.1	$ 880.2
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Number of acquisitions (acquisition) | Acquisition	0	0	2
Purchase Price, net of Cash	$ 0.0	$ 0.0	$ 53.5
Tangible Assets, net	0.0	0.0	2.5
Intangible Assets	0.0	0.0	22.1
Goodwill	$ 0.0	$ 0.0	$ 25.9