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Employee Benefits - Reconciliation of Prepaid (Accrued) Pension Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Reconciliation of prepaid (accrued) pension cost:      
Accrued pension cost at prior fiscal year end $ (3.7) $ 2.2 $ 4.0
Net periodic benefit cost 12.3 7.2 8.2
Contributions made during the year (23.4) (13.1) (10.0)
Accrued pension cost at prior fiscal year end $ (14.8) $ (3.7) $ 2.2