Restructuring and Other Related Charges - Schedule of Changes in Restructuring Reserves Related to Initiatives Announced (Detail) $ in Millions	6 Months Ended
	Apr. 30, 2022 USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at beginning of the period	$ 1.0
Restructuring provision	6.6
Utilized - cash	(4.2)
Utilized - noncash	(0.5)
Balance at end of the period	2.9
Employee Severance and Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Balance at beginning of the period	1.0
Restructuring provision	4.1
Utilized - cash	(2.2)
Balance at end of the period	2.9
Contract Termination and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring provision	2.5
Utilized - cash	(2.0)
Utilized - noncash	$ (0.5)