Credit Facility - Interest Rate Swaps Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Line of Credit Facility [Line Items]
Interest expense	$ 8.5	$ 10.2
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	(4.3)
Tax to be reclassified during the next 12 months	(1.4)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Line of Credit Facility [Line Items]
Net loss from cash flow hedges recorded in accumulated other comprehensive loss, net of tax	(2.5)	(3.3)
Tax related to amounts in accumulated other comprehensive loss	(0.5)	(0.9)
Interest expense	1.2	1.2
Interest expense, net of taxes	$ 0.4	$ 0.4