RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 20.3
Costs incurred and charged to expense	$ 3.7	$ 12.0	7.2	$ 15.1
Costs paid or otherwise settled			(13.4)
Restructuring reserve, ending balance	14.1		14.1
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			18.6
Costs incurred and charged to expense	2.3		3.9
Costs paid or otherwise settled			(9.6)
Restructuring reserve, ending balance	12.9		12.9
Other Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			1.7
Costs incurred and charged to expense	1.4		3.3
Costs paid or otherwise settled			(3.8)
Restructuring reserve, ending balance	$ 1.2		$ 1.2