Annual report pursuant to Section 13 and 15(d)

Leases - Narrative (Details)

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Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Weighted average remaining lease term 3 years 7 months 6 days  
Cash payment included in the measurement of lease liabilities $ 96.9 $ 109.4
Operating lease liabilities arising from new or remeasured right-of-use assets $ 60.2 $ 72.7