BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,897.8	$ 1,497.4	$ 3,834.1	$ 2,989.8
Management Reimbursement Revenue
Segment Reporting Information [Line Items]
Revenues	66.4	56.1	131.3	113.1
Management Reimbursement Revenue | Business & Industry
Segment Reporting Information [Line Items]
Revenues	53.9	43.2	106.4	86.6
Management Reimbursement Revenue | Aviation
Segment Reporting Information [Line Items]
Revenues	$ 12.5	$ 12.9	$ 24.8	$ 26.5