Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Net obligations	$ 8.4	$ 7.4
Projected benefit obligations	16.1	15.0
Fair value of assets	7.8	7.6
Expected return on assets	0.4	0.4	$ 0.4
Net periodic benefit cost	0.6	$ 0.2	$ 0.2
Expected future benefit payments	$ 14.2
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	49.00%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	49.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	2.00%