BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,961.4	$ 1,543.1	$ 5,795.5	$ 4,533.0
Management Reimbursement Revenue
Segment Reporting Information [Line Items]
Revenues	72.8	60.9	204.1	174.1
Management Reimbursement Revenue \| Business & Industry
Segment Reporting Information [Line Items]
Revenues	58.6	47.5	165.0	134.1
Management Reimbursement Revenue \| Aviation
Segment Reporting Information [Line Items]
Revenues	$ 14.2	$ 13.4	$ 39.0	$ 39.9

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details