Schedule II-Valuation and Qualifying Accounts (Detail) - Accounts receivable allowances - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2018		Oct. 31, 2017		Oct. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year		$ 25.5	[1]	$ 18.1		$ 8.6
Charges to Costs and Expenses		57.4	[1]	47.4		29.1
Write-offs/Allowance Taken	[2]	(63.6)		(40.0)		(19.6)
Balance End of Year		$ 19.2		$ 25.5	[1]	$ 18.1

[1] Includes amounts that were classified as held for sale.

[2] Write-offs are net of recoveries.