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Leases - Components of Lease Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Lease Cost [Abstract]    
Operating lease cost $ 53.3 $ 57.4
Variable lease cost 34.0 46.1
Short-term lease cost $ 9.5 $ 8.4