BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,936.2	$ 1,492.4
Management Reimbursement Revenue
Segment Reporting Information [Line Items]
Revenues	64.9	57.0
Management Reimbursement Revenue | Business & Industry
Segment Reporting Information [Line Items]
Revenues	52.5	43.4
Management Reimbursement Revenue | Aviation
Segment Reporting Information [Line Items]
Revenues	$ 12.3	$ 13.7