Employee Benefits - Reconciliation of Prepaid (Accrued) Pension Cost (Details) - USD ($) $ in Millions	12 Months Ended
	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)