Insurance - Insurance Related Balances and Activity (Details) - USD ($) $ in Millions	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Insurance recoverables	$ 64.5	$ 73.7	$ 73.1
Insurance claim reserves, excluding medical and dental
Liability for Claims and Claims Adjustment Expense [Line Items]
Insurance claims reserves	507.8	501.4
Medical and dental claim reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Insurance claims reserves	$ 7.2	$ 8.9