RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Restructuring Reserve [Roll Forward]
October 31, 2019	$ 11.3
Costs incurred and charged to expense	3.3	$ 3.7
Costs paid or otherwise settled	(4.8)
January 31, 2020	9.8
Employee Separation Costs
Restructuring Reserve [Roll Forward]
October 31, 2019	9.5
Costs incurred and charged to expense	2.7
Costs paid or otherwise settled	(4.2)
January 31, 2020	8.0
Other Costs
Restructuring Reserve [Roll Forward]
October 31, 2019	1.8
Costs incurred and charged to expense	0.6
Costs paid or otherwise settled	(0.6)
January 31, 2020	$ 1.8