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Schedule II-Valuation and Qualifying Accounts (Detail) - Accounts receivable allowances - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance Beginning of Year | $ 19.2 | $ 25.5 | $ 18.1
Charges to Costs and Expenses | 87.7 | 57.4 | 47.4
Write-offs/Allowance Taken | (84.6) | (63.6) | (40.0)
Balance End of Year | $ 22.4 | $ 19.2 | $ 25.5

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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