POST RETIREMENT BENEFIT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.2	$ 2.5
Interest cost	6.6	5.2
Expected return on plan assets	(10.3)	(6.2)
Amortization of prior service cost	3.5	1.8
Net periodic costs (benefits) for pension and post-retirement benefits	3.0	3.3
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1
Amortization of prior service cost	(0.1)	(0.4)
Net periodic costs (benefits) for pension and post-retirement benefits	$ 0.0	$ (0.3)