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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, 2023 | Apr. 30, 2022 | Apr. 30, 2023 | Apr. 30, 2022
Retirement Benefits [Abstract] |  |  |  |
Service cost | $ 2.0 | $ 3.0 | $ 4.0 | $ 6.0
Interest cost | 8.7 | 5.1 | 17.4 | 10.2
Expected return on plan assets | (9.7) | (8.3) | (19.4) | (16.5)
Amortization of prior service cost | (0.1) | (0.1) | (0.2) | (0.2)
Recognized net actuarial loss | (0.6) | 2.0 | (1.1) | 4.0
Net periodic pension cost | $ 0.3 | $ 1.7 | $ 0.7 | $ 3.5

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