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POST RETIREMENT BENEFIT PLANS - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3.1 $ 3.5 $ 9.7 $ 10.1
Interest cost 4.7 4.6 13.9 13.8
Expected return on plan assets (6.4) (7.0) (18.6) (21.2)
Amortization of prior service cost and net actuarial gain 3.4 2.6 10.6 8.2
Net periodic costs (benefits) for pension and post-retirement benefits 4.8 3.7 15.6 10.9
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 0.1 0.1 0.3 0.3
Amortization of prior service cost and net actuarial gain (0.4) (0.5) (1.2) (1.2)
Net periodic costs (benefits) for pension and post-retirement benefits $ (0.3) $ (0.4) $ (0.9) $ (0.9)