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Leases - Cash Flow Activity for Leases (Details)
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Leases [Abstract]  
Operating cash flow from operating leases $ 25.7
Operating cash flows from finance leases 9.1
Financing cash flows from finance leases 11.8
Supplemental non-cash flow disclosure  
Acquisition of operating lease asset through lease obligations $ 24.1