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Leases - Supplemental Cash and Non-cash Information (Details)
$ in Millions
9 Months Ended
Jul. 31, 2020
USD ($)
Leases [Abstract]  
Operating cash flows from operating leases $ 34.5
Operating cash flows from finance leases 0.4
Financing cash flows from finance leases 2.7
Lease assets obtained in exchange for new operating lease liabilities(1) $ 15.4