Employee Benefits - Reconciliation of Prepaid (Accrued) Pension Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Reconciliation of (prepaid) accrued pension cost:
(Prepaid)/Accrued pension cost at prior fiscal year end	$ (14.8)	$ (3.7)	$ 2.2
Net periodic benefit cost	14.5	12.3	7.2
Contributions made during the year	(12.7)	(23.4)	(13.1)
(Prepaid)/Accrued pension cost at fiscal year end	$ (13.0)	$ (14.8)	$ (3.7)