Employee Benefits - Schedule of Reconciliation of Prepaid (Accrued) Pension Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Reconciliation of prepaid (accrued) pension cost
Accrued pension cost at prior fiscal year end	$ 2.2	$ 4.0	$ 4.0
Net periodic benefit cost	7.2	8.2	10.0
Contributions made during the year	(13.1)	(10.0)	(10.0)
Accrued pension cost at prior fiscal year end	$ (3.7)	$ 2.2	$ 4.0