RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 21.6
Costs incurred and charged to expense	$ 3.7	$ 19.1	18.8	$ 26.8
Costs paid or otherwise settled			(19.9)
Restructuring reserve, ending balance	20.5		20.5
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			17.9
Costs incurred and charged to expense	1.8		12.4
Costs paid or otherwise settled			(11.9)
Restructuring reserve, ending balance	18.4		18.4
Other Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			3.7
Costs incurred and charged to expense	1.9		6.4
Costs paid or otherwise settled			(8.0)
Restructuring reserve, ending balance	$ 2.1		$ 2.1