Insurance - Instruments Used to Collateralize Insurance Obligations (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 229.5	$ 232.6
Standby letters of credit
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	143.6	141.0
Surety bonds
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	85.2	90.8
Restricted insurance deposits
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 0.7	$ 0.8