Employee Benefit Plans - Deferred Compensation Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Deferred Compensation Plans
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total liability of deferred compensation		$ 13.9	$ 17.6
Compensation expense		0.4	0.4	$ 0.4
Rabbi Trust
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Fair value deferred compensation plan assets	[1]	$ 2.7	$ 4.6

[1] Cash and cash equivalents are stated at nominal value, which equals fair value.