Schedule II - Valuation and Qualifying Accounts for Deferred Income Tax Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	$ 41.5	$ 39.1	$ 59.1
Additions	5.9	3.9	2.8
Reductions/ Charges	2.1	(1.5)	(22.8)
Balance at End of Year	$ 45.3	$ 41.5	$ 39.1