Credit Facility - Interest Rate Swaps Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Net gains from cash flow hedges recorded in accumulated other comprehensive loss, net of tax	$ 1.4		$ 2.2
Interest expense	10.2	$ 13.5
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	(0.2)
Accumulated Net Gain (Loss) from Cash Flow Hedges
Line of Credit Facility [Line Items]
Tax related to amounts in accumulated other comprehensive loss	0.9		$ 1.2
Interest expense	1.2	1.0
Interest expense, tax	$ 0.4	$ 0.4