Income Taxes - Schedule of Income Tax (Benefit) Provision (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) provision	$ 11.2	$ 6.9	$ 15.6	$ 3.2