LEASES - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Apr. 30, 2020	Apr. 30, 2020
Leases [Abstract]
Operating lease cost	$ 15.6	$ 32.8
Finance lease cost	0.5	0.7
Variable lease cost*	7.6	13.8
Total lease cost	$ 23.7	$ 47.3