RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Restructuring Reserve [Roll Forward]
October 31, 2018			$ 4.4
Costs incurred and charged to expense	$ 7.5	$ 6.0	11.2	$ 10.1
Costs paid or otherwise settled			(8.6)
April 30, 2019	7.0		7.0
Employee Separation Costs
Restructuring Reserve [Roll Forward]
October 31, 2018			4.2
Costs incurred and charged to expense	7.0		10.5
Costs paid or otherwise settled			(8.2)
April 30, 2019	6.5		6.5
Other Costs
Restructuring Reserve [Roll Forward]
October 31, 2018			0.2
Costs incurred and charged to expense	0.5		0.7
Costs paid or otherwise settled			(0.4)
April 30, 2019	$ 0.5		$ 0.5