Insurance - Instruments Used to Collateralize Insurance Obligations (Details) - USD ($) $ in Millions	Oct. 31, 2019	Oct. 31, 2018
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 232.6	$ 233.9
Standby letters of credit
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	141.0	144.1
Surety bonds
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	90.8	89.2
Restricted insurance deposits
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 0.8	$ 0.6