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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Debt        
Effective interest rate including effects of interest rate swap agreements 5.50% 5.30% 5.50% 5.30%
Amortization of deferred debt issuance costs $ 4.0 $ 1.2 $ 6.4 $ 3.7