Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Aggregate net obligations	$ 7.5	$ 7.8
Aggregate projected benefit obligation	15.7	15.7
Fair value of plan assets	8.2	7.9
Expected return on assets	0.4	0.5	$ 0.5
Net periodic benefit cost	0.2	$ 0.2	$ 0.2
Expected future benefit payments	$ 13.8
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	47.00%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	43.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	10.00%