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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Debt        
Effective interest rate including effects of interest rate swap agreements 5.50% 5.20% 5.50% 5.20%
Amortization of deferred debt issuance costs $ 1.2 $ 1.2 $ 2.4 $ 2.4