Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Nov. 30, 2020
Operating Loss Carryforwards [Line Items]
Effective tax rate	10.60%	2.30%
Statutory federal income tax rate	21.00%	21.00%	23.00%
Valuation allowance	$ 45.3	$ 41.5
Unrecognized tax benefits	58.5	49.7	$ 68.9
Unrecognized tax benefits that would impact the effective tax rate	46.0	41.7	46.6
Accrued gross interest and penalties related to uncertain tax positions	7.3	$ 3.9	$ 4.4
Significant change in unrecognized tax benefits that is reasonably possible during the next twelve months	7.2
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	20.3
Federal net operating losses expiring	15.8
Federal net operating losses not subject to expiration	4.5
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	16.3
Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Research credit	$ 1.9
Subsequent Event
Operating Loss Carryforwards [Line Items]
Deferred tax asset, intra-entity sale of certain intellectual property rights (up to)				$ 2,400.0