Insurance - Casualty Program Insurance Reserves Rollforward (Details) - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2018		Oct. 31, 2017		Oct. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net balance at beginning of year		$ 412.5	[1]	$ 348.2	[1]	$ 312.7
Change in case reserves plus IBNR Claims — current year		131.4		112.2		104.5
Change in case reserves plus IBNR Claims — prior years		10.2		23.1		35.8
Claims paid		(126.5)		(105.2)		(104.8)
GCA acquisition		0.1		34.1		0.0
Net balance at end of year	[1]	427.7		412.5		348.2
Recoverables		73.7		73.1		69.7
Gross balance at end of year		501.4		485.6		417.9
Provision related to discontinued operations		$ 3.0		$ 10.0		$ 12.0

[1] Includes reserves related to discontinued operations of approximately $3 million for 2018, $10 million for 2017, and $12 million for 2016.