Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 31, 2021	Oct. 31, 2022	Oct. 31, 2021	Jan. 31, 2021	Oct. 31, 2020
Operating Loss Carryforwards [Line Items]
Effective tax rate		18.80%	(499.10%)
Deferred tax asset, intra-entity sale of certain intellectual property rights				$ 1,987.9
Tax benefit related to remeasurement of deferred tax assets due to UK change in tax rate	$ 536.7
Unrecognized tax benefits		$ 336.9	$ 353.8		$ 58.5
Unrecognized tax benefits that would impact the effective tax rate		324.3	336.5		46.0
Accrued gross interest and penalties related to uncertain tax positions		5.4	$ 6.4		$ 7.3
Significant change in unrecognized tax benefits that is reasonably possible during the next twelve months		9.1
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		65.4
Federal net operating losses expiring		17.1
Federal net operating losses not subject to expiration		48.3
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 97.3