Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Net obligations	$ 9.6	$ 8.4
Projected benefit obligations	17.0	16.1
Fair value of assets	7.4	7.8
Expected return on assets	0.4	0.4	$ 0.4
Net periodic benefit cost	0.2	$ 0.6	$ 0.2
Expected future benefit payments	$ 14.4
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	48.00%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	51.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	1.00%