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Insurance - Instruments Used to Collateralize Insurance Obligations (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Letters Of Credit [Line Items]    
Instruments used to collateralize insurance obligations $ 229.7 $ 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 85.4 90.8
Restricted insurance deposits    
Letters Of Credit [Line Items]    
Instruments used to collateralize insurance obligations $ 0.7 $ 0.8