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POST RETIREMENT BENEFIT PLANS - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2024
Apr. 30, 2023
Retirement Benefits [Abstract]        
Service cost $ 1.7 $ 2.0 $ 3.4 $ 4.0
Interest cost 8.7 8.7 17.3 17.4
Expected return on plan assets (10.7) (9.7) (21.5) (19.4)
Amortization of prior service benefit (0.1) (0.1) (0.2) (0.2)
Recognized net actuarial gain (0.3) (0.6) (0.5) (1.1)
Net periodic pension (benefit) cost $ (0.7) $ 0.3 $ (1.5) $ 0.7