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Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 3.0us-gaap_RestructuringReserve	$ 8.0us-gaap_RestructuringReserve
Costs incurred and charged to expense	5.6us-gaap_RestructuringCharges	2.2us-gaap_RestructuringCharges	16.1us-gaap_RestructuringCharges	4.8us-gaap_RestructuringCharges	23.1us-gaap_RestructuringCharges
Costs paid or otherwise settled			(15.0)	(9.8)
Ending balance	4.1us-gaap_RestructuringReserve	3.0us-gaap_RestructuringReserve	4.1us-gaap_RestructuringReserve	3.0us-gaap_RestructuringReserve	8.0us-gaap_RestructuringReserve
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.8	6.2
Costs incurred and charged to expense			12.0	2.8	13.4
Costs paid or otherwise settled			(10.9)	(7.2)
Ending balance	2.9	1.8	2.9	1.8	6.2
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.2	1.8
Costs incurred and charged to expense			4.1	2.0	9.7
Costs paid or otherwise settled			(4.1)	(2.6)
Ending balance	$ 1.2	$ 1.2	$ 1.2	$ 1.2	$ 1.8

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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