Insurance - Instruments Used to Collateralize Insurance Obligations (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 225.7	$ 226.9
Standby letters of credit
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	139.6	143.6
Surety bonds
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	85.4	82.6
Restricted insurance deposits
Letters Of Credit [Line Items]
Instruments used to collateralize insurance obligations	$ 0.7	$ 0.7