POST RETIREMENT BENEFIT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Postemployment Benefits [Abstract]
Defined Benefit Plan, Type [Extensible Enumeration]			us-gaap:PensionPlansDefinedBenefitMember
Service cost	$ 3.0	$ 3.6	$ 9.2	$ 9.6
Interest cost	4.8	7.2	13.9	19.4
Expected return on plan assets	(7.8)	(10.5)	(23.8)	(28.7)
Amortization of prior service cost	0.0	3.4	(0.1)	9.8
Recognized net actuarial loss	2.5	0.0	10.0	0.0
Net periodic pension cost	$ 2.5	$ 3.7	$ 9.2	$ 10.1