Insurance - Casualty Program Insurance Reserves Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net balance at beginning of year	$ 434.8	$ 443.3	$ 427.7
Change in case reserves plus IBNR Claims — current year	117.9	128.5	137.9
Change in case reserves plus IBNR Claims — prior years	(36.0)	(30.2)	(3.4)
Claims paid	(99.8)	(106.8)	(119.1)
Acquisition	91.6	0.2	0.0
Net balance at end of year	508.3	434.8	443.3
Recoverables	66.5	70.1	64.5
Gross balance at end of year	574.8	504.9	507.8
Provision related to discontinued operations	$ 0.3	$ 0.5	$ 1.0