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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Debt      
Effective interest rate including effects of interest rate swap agreements 3.80% 4.40% 5.30%
Amortization of deferred debt issuance costs $ 4.9 $ 10.2 $ 5.4