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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt        
Effective interest rate including effects of interest rate swap agreements     5.3% 3.4%
Amortization of deferred debt issuance costs $ 1.2 $ 1.2 $ 3.7 $ 3.7