Goodwill and Intangible Assets - Summary of Change in Net Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Balance at beginning of period	$ 157.3	$ 157.3
Divestitures (Note 7)	(19.6)	0.0
Balance at end of period	$ 137.7	$ 157.3