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Employee Benefits - Reconciliation of Prepaid (Accrued) Pension Cost (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Reconciliation of (prepaid) accrued pension cost: |  |  |
(Prepaid)/Accrued pension cost at prior fiscal year end | $ (2.9) | $ (13.0) | $ (14.8)
Net periodic benefit cost | 6.8 | 10.1 | 14.5
Contributions made during the year | (1.1) | 0.0 | (12.7)
(Prepaid)/Accrued pension cost at fiscal year end | $ 2.8 | $ (2.9) | $ (13.0)

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