Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2020	Jul. 31, 2020	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract with customer, liability	$ 20.8	$ 20.8	$ 22.0
Contract with customer liability revenue recognized	$ 2.3	$ 8.7