Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2021	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with customer, liability	$ 23.7	$ 23.7	$ 21.9
Contract with customer liability revenue recognized	$ 2.3	$ 4.8