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POST RETIREMENT BENEFIT PLANS - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2.5 $ 3.3
Interest cost 5.2 4.6
Expected return on plan assets (6.2) (6.1)
Amortization of prior service cost and net actuarial loss 1.8 3.6
Net periodic costs (benefits) for pension and post-retirement benefits 3.3 5.4
Other Postretirement Benefit Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 0.1 0.1
Amortization of prior service cost and net actuarial loss (0.4) (0.4)
Net periodic costs (benefits) for pension and post-retirement benefits $ (0.3) $ (0.3)